Higgs-Portal Stueckelberg Dark Matter
Antonio De Felice; Takehiro Ogura; Shinji Tsujikawa; Kimiko Yamashita, We study dark photon dark matter $X$ associated with a dark $U(1)_X$ gauge symmetry. To evade laboratory and cosmological constraints on kinetic mixing with the Standard Model $U(1)_Y$, we assign a $Z_2$-odd dark parity to $X$ that forbids such mixing. The leading interactions then arise from gauge-invariant dimension-6 Higgs-portal operators, including both parity-even and parity-odd terms. We assume that the dark matter mass is generated via the Stueckelberg mechanism, which also induces a dimension-4 Higgs-portal operator $(H^\dagger H) X_μX^μ$ and additional dimension-6 operators. We investigate freeze-in production of $X$ from Higgs-pair annihilations after reheating, incorporating both gauge-invariant and Stueckelberg-induced operators. First, we consider the case in which the Wilson coefficients of the gauge-invariant dimension-6 operators, $C$ and $\tilde{C}$, are of order unity. We find that, in this case, the Stueckelberg contributions remain subdominant in dark matter production. This result follows from the requirement that the effective scale implied by perturbative unitarity must exceed the cutoff scale of the effective field theory. Next, we explore a more general situation in which $C$ and $\tilde{C}$ are smaller than unity. In this second case, Stueckelberg-induced operators can become comparable and lead to distinctive features in the dark-matter parameter space, including interference effects. For both cases, we show that there exists a wide parameter space consistent with the observed dark matter relic density.
preprint, 22 Dec. 2025

Gravitational Positivity Bounds on Higgs-Portal Dark Matter
Kimiko Yamashita, Corresponding, We consider gravitational positivity bounds on the Higgs-portal scalar dark matter model. Applying gravitational positivity bounds with dark matter forward scattering process $ϕϕ\to ϕϕ$ to this DM model, we find that the new physics, besides the Higgs-portal dark matter physics, arises at an energy scale lower than $10^{10}$ GeV without the dark matter self-coupling. With the existence of the dark matter self-coupling, the hierarchical order of magnitude between the self-coupling $λ_ϕ$ and the Higgs-portal coupling $λ_{hϕ}$ changes the game. With $λ_ϕ/λ_{hϕ} = 10^{12}$, the GUT scale cutoff can realize. In this case, the dark freezeout scenario is possible for realizing the relic density of dark matter in the Universe. We find that $λ_ϕ \sim O(1)$, $λ_{hϕ} \sim 10^{-12}$, and sub-GeV dark matter is implicated for the GUT scale cutoff possibility with the Higgs-portal dark matter model., arXiv
preprint, Apr. 2025

Standard Model anomalies and vacuum stability for lepton portals with extra U(1) symmetry
Carlo Branchina; Hyun Min Lee; Kimiko Yamashita, Recently, the experimental values of the muon $(g-2)_\mu$ and of the $W$
boson mass $m_{_W}$ have both indicated significant deviations from the SM
predictions, motivating the exploration of extensions with extra particles and
symmetries. We revisit a lepton portal model with $U(1)'$ gauge symmetry where
an extra Higgs doublet, a scalar singlet and one $SU(2)_L$ singlet vector-like
fermion are introduced. In this model, $(g-2)_\mu$ can be explained by extra
one-loop contributions from the vector-like lepton and the $Z'$ boson, whereas
$m_{_W}$ can be increased by a tree-level mixing between the $Z$ and $Z'$.
Setting the $Z'$ and lepton couplings at low energies to account for the SM
anomalies, we perform a Renormalization Group analysis to investigate on the
high-energy behaviour of the model, in particular on the issue of vacuum
stability. We find that in the alignment limit for the two Higgs doublets, the
Landau pole and the scale where perturbativity is lost are of order
$10-100\,{\rm TeV}$, not far from the scales experimentally reached so far, and
sensibly lower than the stability scale. We show how the Landau pole can be
increased up to $\sim10^9\,{\rm GeV}$ in a misaligned scenario where the
experimental anomalies are still accommodated and a positive shift of the Higgs
quartic coupling to improve stability can be achieved.
Journal of High Energy Physics, 18 Mar. 2025, [Reviewed]

Higgs-portal spin-1 dark matter with parity-violating interaction
Kimiko Yamashita, Corresponding
Journal of High Energy Physics, 29 Oct. 2024, [Reviewed]

Positivity bounds on Higgs-portal freeze-in dark matter
Seong-Sik Kim; Hyun Min Lee; Kimiko Yamashita, Abstract

We consider the relic density and positivity bounds for freeze-in scalar dark matter with general Higgs-portal interactions up to dimension-8 operators. When dimension-4 and dimension-6 Higgs-portal interactions are proportional to mass squares for Higgs or scalar dark matter in certain microscopic models such as massive graviton, radion or general metric couplings with conformal and disformal modes, we can take the dimension-8 derivative Higgs-portal interactions to be dominant for determining the relic density via the 2-to-2 thermal scattering of the Higgs fields after reheating. We discuss the implications of positivity bounds for microscopic models. First, massive graviton or radion mediates attractive forces between Higgs and scalar dark matter and the resultant dimension-8 operators respect the positivity bounds. Second, the disformal couplings in the general metric allow for the subluminal propagation of graviton but violate the positivity bounds. We show that there is a wide parameter space for explaining the correct relic density from the freeze-in mechanism and the positivity bounds can curb out the dimension-8 derivative Higgs-portal interactions nontrivially in the presence of the similar dimension-8 self-interactions for Higgs and dark matter., Springer Science and Business Media LLC
Journal of High Energy Physics, 20 Nov. 2023, [Reviewed]

The SU(2)$_{D}$ lepton portals for muon g - 2, W boson mass and dark matter
Seong-Sik Kim; Hyun Min Lee; Adriana Guerrero Menkara; Kimiko Yamashita, Stichting SciPost
SciPost Physics Proceedings, 04 Jul. 2023, [Reviewed]

Positivity bounds on Higgs-Portal dark matter
Seong Sik Kim; Hyun Min Lee; Kimiko Yamashita
Journal of High Energy Physics, Jun. 2023, [Reviewed]

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics
Xu Li; Ken Mimasu; Kimiko Yamashita; Chengjie Yang; Cen Zhang; Shuang-Yong Zhou
Journal of High Energy Physics, 17 Oct. 2022, [Reviewed]

SU (2)D lepton portals for the muon g-2, W -boson mass, and dark matter
Seong Sik Kim; Hyun Min Lee; Adriana G. Menkara; Kimiko Yamashita
Physical Review D, 01 Jul. 2022, [Reviewed]

A model of vector-like leptons for the muon g- 2 and the W boson mass
Lee, H.M.; Yamashita, K.
European Physical Journal C, 2022, [Reviewed]

Reheating and dark matter freeze-in in the Higgs-R ² inflation model
Aoki; S.; Lee; H.M.; Menkara; A.G.; Yamashita; K.
Journal of High Energy Physics, 2022, [Reviewed]

Searching for monopoles via monopolium multiphoton decays
Neil D. Barrie; Akio Sugamoto; Matthew Talia; Kimiko Yamashita
Nuclear Physics B, Nov. 2021, [Reviewed]

Elastic positivity vs extremal positivity bounds in SMEFT: a case study in transversal electroweak gauge-boson scatterings
Kimiko Yamashita; Cen Zhang; Shuang-Yong Zhou
Journal of High Energy Physics, 18 Jan. 2021, [Reviewed]

Seesaw lepton masses and muon g- 2 from heavy vector-like leptons
Lee; H.M.; Song; J.; Yamashita; K., Springer Science and Business Media {LLC}
Journal of the Korean Physical Society, 2021, [Reviewed]

Search for vector-mediated dark matter at the LHC with forward proton tagging
Gi-Chol Cho; Kimiko Yamashita; Miki Yonemura
Physical Review D, 18 Feb. 2020, [Reviewed]

Higgs inflation, vacuum stability, and leptogenesis
Barrie; N.D.; Sugamoto; A.; Takeuchi; T.; Yamashita; K.
Journal of High Energy Physics, 2020, [Reviewed]

The effects of coating culture dishes with collagen on fibroblast cell shape and swirling pattern formation
Hashimoto; K.; Yamashita; K.; Enoyoshi; K.; Dahan; X.; Takeuchi; T.; Kori; H.; Gotoh; M.
Journal of Biological Physics, 2020, [Reviewed]

Unitary inflaton as decaying dark matter
Choi; S.-M.; Kang; Y.-J.; Lee; H.M.; Yamashita; K.
Journal of High Energy Physics, 2019, [Reviewed]

Vacuum magnetic birefringence experiment as a probe of the dark sector
Fan; X.; Kamioka; S.; Yamashita; K.; Asai; S.; Sugamoto; A.
Progress of Theoretical and Experimental Physics, 2018, [Reviewed]

LHC searches for top-philic Kaluza-Klein graviton
Geng; C.-Q.; Huang; D.; Yamashita; K.
Journal of High Energy Physics, 2018, [Reviewed]

Pendulum Leptogenesis
Bamba; K.; Barrie; N.D.; Sugamoto; A.; Takeuchi; T.; Yamashita; K.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2018, [Reviewed]

Ratchet baryogenesis and an analogy with the forced pendulum
Bamba; K.; Barrie; N.D.; Sugamoto; A.; Takeuchi; T.; Yamashita; K., World Scientific Pub Co Pte Lt
Modern Physics Letters A, 2018, [Reviewed]

Simplified dark matter models with a spin-2 mediator at the LHC
Kraml; S.; Laa; U.; Mawatari; K.; Yamashita; K.
European Physical Journal C, 2017, [Reviewed]

Generalized Heisenberg-Euler formula in Abelian gauge theory with parity violation
Yamashita; K.; Fan; X.; Kamioka; S.; Asai; S.; Sugamoto; A.
Progress of Theoretical and Experimental Physics, 2017, [Reviewed]

Construction of a model of monopolium and its search via multiphoton channels at LHC
Barrie; Neil D.; Sugamoto; Akio; Yamashita; Kimiko
PTEP, 01 Nov. 2016, [Reviewed]

Quantification of Interaction between Human Skin Fibroblasts and Collagen by Image Texture Analysis　　　　　　　　　　　　　　　
Md. K. Bashar; K. Hashimoto; K. Enoyoshi; K. Yamashita; M. Gotoh; H. Kori
J. of Bioinformatics and Neuroscience (JBINS), Dec. 2015, [Reviewed]

Pattern Quantification from Human Skin Fibroblast Images Image quantification for fibroblast chracterization
Md. Khayrul Bashar; Kei Hashimoto; Kanako Enoyoshi; Kimiko Yamashita; Mari Gotoh; Hiroshi Kori
2015 INTERNATIONAL CONFERENCE ON INTELLIGENT INFORMATICS AND BIOMEDICAL SCIENCES (ICIIBMS), 2015, [Reviewed]

Search for Kaluza-Klein gravitons in extra dimension models via forward detectors at the LHC
Cho; G.-C.; Kono; T.; Mawatari; K.; Yamashita; K.
Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, [Reviewed]

The anomalous magnetic moment of the muon in the Standard Model: an update
Aliberti, R.; Aoyama, T.; Balzani, E.; Bashir, A.; Benton, G.; Bijnens, J.; Biloshytskyi, V.; Blum, T.; Boito, D.; Bruno, M.; Budassi, E.; Burri, S.; Cappiello, L.; Carloni Calame, C.M.; Cè, M.; Cirigliano, V.; Clarke, D.A.; Colangelo, G.; Cotrozzi, L.; Cottini, M.; Danilkin, I.; Davier, M.; Della Morte, M.; Denig, A.; DeTar, C.; Druzhinin, V.; Eichmann, G.; El-Khadra SC, A.X.; Estrada, E.; Feng, X.; Fischer, C.S.; Frezzotti, R.; Gagliardi, G.; Gérardin, A.; Ghilardi, M.; Giusti, D.; Golterman, M.; Gonzàlez-Solís, S.; Gottlieb, S.; Gruber, R.; Guevara, A.; Gülpers, V.; Gurgone, A.; Hagelstein, F.; Hayakawa, M.; Hermansson-Truedsson, N.; Hoecker, A.; Hoferichter SC, M.; Hoid, B.-L.; Holz, S.; Hudspith, R.J.; Ignatov, F.; Jin, L.; Kalntis, N.; Kanwar, G.; Keshavarzi, A.; Komijani, J.; Koponen, J.; Kuberski, S.; Kubis, B.; Kupich, A.; Kupść, A.; Lahert, S.; Laporta, S.; Lehner SC, C.; Lellmann, M.; Lellouch, L.; Leplumey, T.; Leutgeb, J.; Lin, T.; Liu, Q.; Logashenko, I.; London, C.Y.; Castro, G. López; Lüdtke, J.; Lusiani, A.; Lutz, A.; Mager, J.; Malaescu, B.; Maltman, K.; Marinković, M.K.; Márquez, J.; Masjuan, P.; Meyer, H.B.; Mibe SC, T.; Miller, N.; Miramontes, A.; Miranda, A.; Montagna, G.; Müller, S.E.; Neil, E.T.; Nesterenko, A.V.; Nicrosini, O.; Nio, M.; Nomura, D.; Paltrinieri, J.; Parato, L.; Parrino, J.; Pascalutsa, V.; Passera, M.; Peris, S.; Petit Rosàs, P.; Piccinini, F.; Pilato, R.N.; Polat, L.; Portelli, A.; Portillo-Sánchez, D.; Procura, M.; Punzi, L.; Raya, K.; Rebhan, A.; Redmer, C.F.; Roberts SC, B.L.; Rodríguez-Sánchez, A.; Roig, P.; de Elvira, J. Ruiz; Sánchez-Puertas, P.; Signer, A.; Sitison, J.W.; Stamen, D.; Stöckinger, D.; Stöckinger-Kim, H.; Stoffer, P.; Sue, Y.; Tavella, P.; Teubner SC, T.; Toelstede, J.-N.; Toledo, G.; Torres Bobadilla, W.J.; Tsang, J.T.; Ucci, F.P.; Ulrich, Y.; Van de Water, R.S.; Venanzoni, G.; Volkov, S.; von Hippel, G.; Wang, G.; Wenger, U.; Wittig SC, H.; Wright, A.; Zaid, E.; Zanke, M.; Zhang, Z.; Zillinger, M.; Alexandrou, C.; Altherr, A.; Anderson, M.; Aubin, C.; Bacchio, S.; Beltrame, P.; Beltran, A.; Boyle, P.; Campos Plasencia, I.; Caprini, I.; Chakraborty, B.; Chanturia, G.; Crivellin, A.; Czarnecki, A.; Dai, L.-Y.; Dave, T.; Del Debbio, L.; Demory, K.; Djukanovic, D.; Draper, T.; Driutti, A.; Endo, M.; Erben, F.; Ferraby, K.; Finkenrath, J.; Flower, L.; Francis, A.; Gámiz, E.; Gogniat, J.; Grebe, A.V.; Gündogdu, S.; Hansen, M.T.; Hashimoto, S.; Hayashii, H.; Hertzog, D.W.; Heuser, L.A.; Hostetler, L.; Hou, X.T.; Huang, G.S.; Iijima, T.; Inami, K.; Jüttner, A.; Kitano, R.; Knecht, M.; Kollatzsch, S.; Kronfeld, A.S.; Lenz, T.; Levati, G.; Li, Q.M.; Liao, Y.P.; Libby, J.; Liu, K.F.; Lubicz, V.; Lynch, M.T.; Lytle, A.T.; Ma, J.L.; Miura, K.; Möhling, K.; Muskalla, J.; Noël, F.; Ottnad, K.; Paradisi, P.; Peterson, C.T.; Pich, A.; Pitelis, S.; Plura, S.; Price, A.; Radic, D.; Radzhabov, A.; Risch, A.; Romiti, S.; Sahoo, S.; Sannino, F.; Schäfer, H.; Schelhaas, Y.; Serednyakov, S.I.; Shekhovtsova, O.; Simone, J.N.; Simula, S.; Solodov, E.P.; Stokes, F.M.; Vanderhaeghen, M.; Vaquero, A.; Vestergaard, N.; Wang, W.P.; Wąs, Z.; Yamashita, K.; Yang, Y.B.; Yoshioka, T.; Yuan, C.Z.; Zhevlakov, A.S.
Phys.Rept., Nov. 2025, [Reviewed]

A Window into the Laboratory: My Research Journey (in Japanese)　　　　　　　　　　　　　　　
Kimiko Yamashita
Sūri kagaku = Mathematical sciences, 20 Aug. 2025

Reinterpretation and preservation of data and analyses in HEP
Jon Butterworth; Sabine Kraml; Harrison Prosper; Andy Buckley; Louie Corpe; Cristinel Diaconu; Mark Goodsell; Philippe Gras; Martin Habedank; Clemens Lange; Kati Lassila-Perini; André Lessa; Rakhi Mahbubani; Judita Mamužić; Zach Marshall; Thomas McCauley; Humberto Reyes-Gonzalez; Krzysztof Rolbiecki; Sezen Sekmen; Giordon Stark; Graeme Watt; Jonas Würzinger; Shehu AbdusSalam; Aytul Adiguzel; Amine Ahriche; Ben Allanach; Mohammad M. Altakach; Jack Y. Araz; Alexandre Arbey; Saiyad Ashanujjaman; Volker Austrup; Emanuele Bagnaschi; Sumit Banik; Csaba Balazs; Daniele Barducci; Philip Bechtle; Samuel Bein; Nicolas Berger; Tisa Biswas; Fawzi Boudjema; Jamie Boyd; Carsten Burgard; Jackson Burzynski; Jordan Byers; Giacomo Cacciapaglia; Cécile Caillol; Orhan Cakir; Christopher Chang; Gang Chen; Andrea Coccaro; Yara do Amaral Coutinho; Andreas Crivellin; Leo Constantin; Giovanna Cottin; Hridoy Debnath; Mehmet Demirci; Juhi Dutta; Joe Egan; Carlos Erice Cid; Farida Fassi; Matthew Feickert; Arnaud Ferrari; Pavel Fileviez Perez; Dillon S. Fitzgerald; Roberto Franceschini; Benjamin Fuks; Lorenz Gärtner; Kirtiman Ghosh; Andrea Giammanco; Alejandro Gomez Espinosa; Letícia M. Guedes; Giovanni Guerrieri; Christian Gütschow; Abdelhamid Haddad; Mahsana Haleem; Hassane Hamdaoui; Sven Heinemeyer; Lukas Heinrich; Ben Hodkinson; Gabriela Hoff; Cyril Hugonie; Sihyun Jeon; Adil Jueid; Deepak Kar; Anna Kaczmarska; Venus Keus; Michael Klasen; Kyoungchul Kong; Joachim Kopp; Michael Krämer; Manuel Kunkel; Bertrand Laforge; Theodota Lagouri; Eric Lancon; Peilian Li; Gabriela Lima Lichtenstein; Yang Liu; Steven Lowette; Jayita Lahiri; Siddharth Prasad Maharathy; Farvah Mahmoudi; Vasiliki A. Mitsou; Sanjoy Mandal; Michelangelo Mangano; Kentarou Mawatari; Peter Meinzinger; Manimala Mitra; Mojtaba Mohammadi Najafabadi; Sahana Narasimha; Siavash Neshatpour; Jacinto P. Neto; Mark Neubauer; Mohammad Nourbakhsh; Giacomo Ortona; Rojalin Padhan; Orlando Panella; Timothée Pascal; Brian Petersen; Werner Porod; Farinaldo S. Queiroz; Shakeel Ur Rahaman; Are Raklev; Hossein Rashidi; Patricia Rebello Teles; Federico Leo Redi; Jürgen Reuter; Tania Robens; Abhishek Roy; Subham Saha; Ahmetcan Sansar; Kadir Saygin; Nikita Schmal; Jeffrey Shahinian; Sukanya Sinha; Ricardo C. Silva; Tim Smith; Tibor Šimko; Andrzej Siodmok; Ana M. Teixeira; Tamara Vázquez Schröder; Carlos Vázquez Sierra; Yoxara Villamizar; Wolfgang Waltenberger; Peng Wang; Martin White; Kimiko Yamashita; Ekin Yoruk; Xuai Zhuang
31 Mar. 2025

Particle Dark Matter and Its Connection to the Early Universe
Kimiko Yamashita
Invited Lecturer for Waseda Univ. Tsujikawa–Yamada Group Spring Camp, Feb. 2026, [Invited]
20260222, 20260223

Parity Violation in Spin-1 Dark Matter with EFT Descriptions
Kimiko Yamashita
The 2026 Chung-Ang University Beyond the Standard Model Focus Workshop (CAU BSM Focus), 09 Feb. 2026, [Invited]
20260209, 20260212

Higgs-Portal Spin-1 Dark Matter with Parity-Violating Interaction
Kimiko Yamashita
New Physics from Gravitational Waves 2025, 19 Sep. 2025
20250919, 20250920

Higgs-portal spin-1 dark matter with parity-violating interaction
Kimiko Yamashita
80th Annual Meeting(2025), The Physical Society of Japan, 19 Sep. 2025
20250916, 20250919

Higgs-Portal Spin-1 Dark Matter with Parity-Violating Interaction
Kimiko Yamashita
The Conferences on Supersymmetry and Unification of Fundamental Interactions (SUSY) 2025, 19 Aug. 2025
20250818, 20250823

Gravitational Positivity Bounds on Higgs-Portal Dark Matter
Kimiko Yamashita
Seminar at Kavli IPMU, 11 Jun. 2025, [Invited]

Vector-like lepton model for the muon g-2 and dark matter
Kimiko Yamashita
The 29th muon g-2/EDM collaboration meeting, 11 Dec. 2024
20241211, 20241213

Higgs-Portal Spin-1 Dark Matter with Parity-Violating Interaction
Kimiko Yamashita
COSMO'24, 22 Oct. 2024
20241021, 20241025

High Energy Physics and Dark Matter (in Japanese)
山下 公子
Seminar at Tokyo Woman's Christian Univ., 28 Jun. 2024, [Invited]

Real Scalar Dark Matter and UV Completion
Kimiko Yamashita
CosmoGravitas, 14 Jun. 2024, [Invited]
20240610, 20240614

Positivity Bounds on Higgs-Portal Dark Matter
Kimiko Yamashita
The Future is Flavourful, 05 Jun. 2024
20240604, 20240606

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Seong-Sik Kim
6th Mini-Workshop on "CHIRALITY IN THE UNIVERSE BEYOND THE ELECTROWEAK SCALE", 27 Apr. 2024
20240426, 20240429

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
The 37th Regular Meeting of the New Higgs Working Group, 20 Jan. 2024
20240120, 20240120

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Osaka Univ., 14 Nov. 2023, [Invited]

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2023), 07 Nov. 2023
20231107, 20231110

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
山下 公子
Online seminar at Shinshu Univ., 31 Oct. 2023, [Invited]

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
26th International Conference on Particle Physics and Cosmology (COSMO'23), 14 Sep. 2023, Instituto de Física Teórica (IFT UAM-CSIC)
20230911, 20230915

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Progress in Particles Physics 2023, 28 Aug. 2023, [Invited]
20230828, 20230901

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Kickoff Workshop (Searching for New Particles using Gravitational Waves), 12 Jun. 2023
20230612, 20230612

Positivity Bounds on Higgs-Portal Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
HPNP2023 - The 6th International Workshop on "Higgs as a Probe of New Physics 2023", 08 Jun. 2023
20230605, 20230609

Positivity bounds on Higgs-portal dark matter
Kimiko Yamashita
2023 Chung-Ang University Beyond the Standard Model Workshop, 21 Feb. 2023, Shuntaro Aoki (CAU), Carlo Branchina (CAU), Sookyung Choi (CAU), Chang Hyon Ha (CAU), Yu Seon Jeong (CAU), Gungwon Kang (CAU), Siyeon Kim (CAU), Hyun Min Lee (CAU), Seong Chan Park (Yonsei), Kimiko Yamashita (CAU)
20230220, 20230224

Moments for positivity: using Drell-Yan data to test positivity bounds and reverse-engineer new physics　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2023 Spring Meeting, 23 Feb. 2023

Boson Dark Matter Models　　　　　　　　　　　　　　　
Kimiko Yamashita
2022 CAU High Energy Physics Center Workshop, 22 Dec. 2022
20221222, 20221223

Reheating and dark matter freeze-in in the Higgs-R^2 inflation model　　　　　　　　　　　　　　　
Kimiko Yamashita
64th OMEG-SSANP Workshop, 12 Dec. 2022
20221212, 20221212

Reheating and dark matter freeze-in in the Higgs-R^2 inflation model　　　　　　　　　　　　　　　
Kimiko Yamashita
9th Korea-Japan Workshop on Dark Energy, 15 Nov. 2022
20221114, 20221118

Positivity Bounds for Scalar Dark Matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Workshop on Physics of Dark Cosmos: dark matter, dark energy, and all, 22 Oct. 2022
20221021, 20221023

Model for Muon g-2 and the W Boson Mass　　　　　　　　　　　　　　　
Kimiko Yamashita
KPS 70th Anniversary and 2022 Fall Meeting, 19 Oct. 2022
20221018, 20221021

Reheating and dark matter freeze-in in the Higgs-R^2 inflation model　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Waseda Univ. (online), 07 Oct. 2022, [Invited]

Seesaw vector-like leptons for muon g-2, W boson mass, and dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Progress in Particle Physics 2022 (PPP2022), 29 Aug. 2022
20220829, 20220902

A model of vector-like leptons for the muon g−2 and the W boson mass　　　　　　　　　　　　　　　
Kimiko Yamashita
Asia Pacific Physics Conference 15 (APPC15, ONLINE), 23 Aug. 2022
20220821, 20220826

Reheating and dark matter freeze-in in the Higgs-R^2 inflation model　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Hiroshima Univ., 12 Aug. 2022, [Invited]

Seesaw vector-like leptons for muon g − 2, W boson mass, and dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
The 27th International Symposium on Particle Physics, String Theory, and Cosmology (PASCOS2022), 25 Jul. 2022
20220725, 20220729

Reheating and dark matter freeze-in in the Higgs-R2 inflation model　　　　　　　　　　　　　　　
Kimiko Yamashita
2nd NCTS TG2.1 Hsinchu Hub Workshop: The Future is illuminating (Virtual), 28 Jun. 2022
20220628, 20220630

Seesaw lepton masses and muon g-2 from heavy vector-like leptons　　　　　　　　　　　　　　　
Kimiko Yamashita
2022 Korean Physical Society Spring Meeting (ONLINE), 20 Apr. 2022
20220420, 20220422

Seesaw lepton masses and muon g-2 from heavy vector-like leptons　　　　　　　　　　　　　　　
Kimiko Yamashita
2021 CAU High Energy Physics Center Workshop, Dec. 2021
20211222, 20211223

Seesaw lepton masses and muon g-2 from heavy vector-like leptons　　　　　　　　　　　　　　　
Kimiko Yamashita
Workshop on particle physics and cosmology 2021, 27 Nov. 2022
20211126, 20211128

Elastic positivity vs extremal positivity bounds in SMEFT: a case study in transversal electroweak gauge-boson scatterings　　　　　　　　　　　　　　　
Kimiko Yamashita
Recent development of beyond the standard model, 19 Oct. 2022
20211018, 20211019

Elastic positivity vs extremal positivity bounds in SMEFT　　　　　　　　　　　　　　　
Kimiko Yamashita
Summer camp on ILC accelerator, physics and detectors 2021 (ONLINE), 24 Sep. 2021
20210921, 20210924

Elastic positivity vs extremal positivity bounds in SMEFT　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Kyushu Univ. (online), 09 Jul. 2021, [Invited]

1st EFT study meeting　　　　　　　　　　　　　　　
Kimiko Yamashita
1st EFT study meeting, 01 Jul. 2021
20210630, 20210702

Elastic positivity vs extremal positivity bounds in SMEFT: a case study in transversal electroweak gauge-boson scatterings　　　　　　　　　　　　　　　
Kimiko Yamashita
The 26th International Symposium on Particle Physics, String Theory, and Cosmology (PASCOS2021, ONLINE), 18 Jun. 2021
20210614, 20210618

Elastic positivity vs extremal positivity bounds in SMEFT　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Kyoto Univ., 26 May 2021, [Invited]

Higgs Inflation, Vacuum Stability, and Leptogenesis　　　　　　　　　　　　　　　
Kimiko Yamashita
The 5th International Workshop on “Higgs as a Probe of New Physics” Special Edition 2021 (HPNP2021, ONLINE), 25 Mar. 2021
20210325, 20210327

Higgs Inflation, Vacuum Stability, and Leptogenesis　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan Annual (76th) Meeting (ONLINE), 13 Mar. 2021
20210312, 20210315

Higgs Inflation, Vacuum Stability, and Leptogenesis,　　　　　　　　　　　　　　　
Kimiko Yamashita
Professor Chao-Qiang Geng online workshop (Recent development of beyond the standard model), 08 Dec. 2022
20201207, 20201208

Higgs Inflation, Vacuum Stability, and Leptogenesis　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Chung-Ang Univ. (online), 12 Nov. 2020

SMEFT Meets UV Completion with Analyticity and Unitarity　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2020 Autumn Meeting (ONLINE), 15 Sep. 2020
20200914, 20200917

Baryogenesis mechanism from the dynamics of a rotating forced pendulum　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Iwate Univ., 29 Jun. 2020

SMEFT meets UV completion with Analyticity and Unitarity　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Tokyo Univ., 28 Feb. 2020

SMEFT Meets UV Completion with Analyticity and Unitarity　　　　　　　　　　　　　　　
Kimiko Yamashita
KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2020), 18 Feb. 2020
20200218, 20200221

Unitary inflaton as decaying dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
International joint workshop on the Standard Model and beyond, 17 Oct. 2019
20191014, 20191017

LHC Searches for Top-philic Kaluza-Klein Graviton　　　　　　　　　　　　　　　
Kimiko Yamashita
The thirteenth particle physics phenomenology workshop, 05 Jun. 2019
20190603, 20190606

Unitary inflaton as decaying dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Chung Yuan Christian Univ., 04 Jun. 2019, [Invited]

Unitary inflaton as decaying dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at National Chiao Tung Univ., 28 May 2019, [Invited]

Unitary inflaton as decaying dark matter　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Korea Institute for Advanced Study (KIAS), 24 May 2019

Pendulum Leptogenesis　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Chung-Ang Univ., 22 May 2019, [Invited]

LHC Searches for Kaluza-Klein Graviton Decaying into SM/DM particles　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at National Central Univ., 24 Apr. 2019, [Invited]

LHC Searches for Kaluza-Klein Graviton Decaying into SM/DM particles　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at National Taiwan Univ., 14 Jan. 2019, [Invited]

LHC Searches for Kaluza-Klein Graviton Decaying into SM/DM particles　　　　　　　　　　　　　　　
Kimiko Yamashita
KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018 winter) and 3rd KIAS-NCTS-KEK workshop on Particle Physics Phenomenology, 04 Dec. 2018, [Invited]
20181204, 20181208

LHC Searches for Kaluza-Klein Graviton Decaying into SM/DM particles　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Chung-Ang Univ., 15 Nov. 2018, [Invited]

LHC Searches for Kaluza-Klein Graviton　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at National Chiao Tung Univ., 16 Oct. 2018, [Invited]

Pendulum Leptogenesis　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2018 Autumn Meeting, 14 Sep. 2018
20180914, 20180917

Collective Flows of Asymmetric Dumbbells　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2018 Autumn Meeting, 11 Sep. 2018
20180909, 20180912

Search for Dark Neutrino via Vacuum Magnetic Birefringence Experiment　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Kavli IPMU, 04 Apr. 2018

Clemmow-Mullaly-Allis (CMA) Diagram for Electromagnetic Waves in the Vacuum　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan Annual (73rd) Meeting, 25 Mar. 2018
20180322, 20180325

Search for Dark Neutrino via Vacuum Magnetic Birefringence Experiment　　　　　　　　　　　　　　　
Kimiko Yamashita
KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018),, 16 Feb. 2018
20180213, 20180216

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Joint NTHU/NCTS theory seminar, 21 Dec. 2017

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at National Taiwan Univ., 18 Dec. 2017

Searching for fermions with parity-violating interactions via the hidden U(1) gauge field to photon by the vacuum birefringence experiment, and the EFT Lagrangian of 4-photon fields　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Maskawa Institute for Science and Culture in Kyoto Sangyo Univ., 20 Nov. 2017, [Invited]

Simplified dark matter models with a spin-2 mediator at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
Osaka-Workshop 2017, 13 Nov. 2017
20171111, 20171113

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at IBS-CTPU, 28 Sep. 2017

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Korea Institute for Advanced Study (KIAS), 25 Sep. 2017

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at APCTP, 22 Sep. 2017

Simplified dark matter models with a spin-2 mediator at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2017 Autumn Meeting, 14 Sep. 2017
20170912, 20170915

Generalized Heisenberg-Euler Formula in Abelian Gauge Theory with Parity Violation　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2017 Autumn Meeting, 13 Sep. 2017
20170912, 20170915

Implications for the Vacuum Magnetic Birefrigence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Progress in Particle Physics 2017 (PPP2017), 03 Aug. 2017
20170731, 20170804

Implications for the Vacuum Magnetic Birefrigence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Progress in Particle Physics 2017 (PPP2017), 03 Aug. 2017
20170731, 20170804

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
The 13th International Workshop on the Dark Side of the Universe, 11 Jul. 2017
20170710, 20170714

Implications for the Vacuum Magnetic Birefringence Experiment from the Parity Violating Interactions between Fermionic Dark Matter and Extra U(1) Mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Saitama Univ., 07 Jul. 2017, [Invited]

Simplified dark matter models with a spin-2 mediator at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
LHCTheory ERC meeting, 24 Mar. 2017
20170322, 20170324

Ratchet baryogenesis during reheating　　　　　　　　　　　　　　　
Kimiko Yamashita
The Third Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP 2016), 16 Oct. 2016
20161012, 20161025

Dark matter constraints on simplified models with s-channel spin-2 mediators　　　　　　　　　　　　　　　
Kimiko Yamashita
The Third Asia-Europe-Pacific School of High-Energy Physics(AEPSHEP 2016), 16 Oct. 2016
20161012, 20161025

Comprehensive study on simplified DM models with a spin-2 mediator　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2016 Autumn Meeting, 21 Sep. 2016
20160921, 20160924

Construction of a Model of Monopolium and its Search via Multi-Photon Channels at LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
Progress in Particle Physics 2016 (PPP2016), 08 Sep. 2016
20160905, 20160909

Ratchet Baryogenesis during Reheating　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan Annual (71st) Meeting, 21 Mar. 2016
20160319, 20160322

Search for Kaluza-Klein gravitons in extra dimension models via forward detectors at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at LPSC Grenoble, 11 Mar. 2016

Ratchet baryogenesis during reheating　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Virginia Polytechnic Institute and State University, 21 Oct. 2015

Ratchet baryogenesis during reheating
Kimiko Yamashita
The 23rd International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2015), 26 Aug. 2015
20150823, 20150829

Search for Kaluza-Klein gravitons in extra dimension models via forward detectors at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
Seminar at Toyama Univ., 29 May 2015

Search for extra dimensions via forward detectors at the LHC　　　　　　　　　　　　　　　
Kimiko Yamashita
The Physical Society of Japan 2014 Autumn Meeting, 19 Sep. 2014
20140918, 20140921

Search for extra dimensions via forward detectors at the LHC
Kimiko Yamashita
The 22nd International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2015), 21 Jul. 2014
20140721, 20140726

Research of Quantum Beam Science IV　　　　　　　　　　　　　　　
Sep. 2024 - Present
Ibaraki University

Elementary Particle Physics I　　　　　　　　　　　　　　　
Jun. 2024 - Present
Ibaraki University

Exercises in Physics I　　　　　　　　　　　　　　　
Jun. 2024 - Present
Ibaraki University

Research of Quantum Beam Science III　　　　　　　　　　　　　　　
Apr. 2024 - Present
Ibaraki University

Graduation Research　　　　　　　　　　　　　　　
Apr. 2024 - Present
Ibaraki University

Seminar on Foreign Textbook I　　　　　　　　　　　　　　　
Apr. 2024 - Present
Ibaraki University

Research of Quantum Beam Science II　　　　　　　　　　　　　　　
Oct. 2023 - Present
Ibaraki University

Exercises in Physics II　　　　　　　　　　　　　　　
Oct. 2023 - Present
Ibaraki University

Seminar on Foreign Textbook II　　　　　　　　　　　　　　　
Sep. 2023 - Present
Ibaraki University

Computational Exercises in Mathematical Physics/Quantum Beam Spectroscopy I　　　　　　　　　　　　　　　
Sep. 2023 - Present
Ibaraki University

Research of Quantum Beam Science I　　　　　　　　　　　　　　　
Apr. 2023 - Present
Ibaraki University

Physics Seminar　　　　　　　　　　　　　　　
Oct. 2025 - Oct. 2025
Ibaraki University

Introduction to Integrated Sciences　　　　　　　　　　　　　　　
Apr. 2024 - Apr. 2024
Ibaraki University

Exercises in Physics I　　　　　　　　　　　　　　　
Apr. 2023 - Aug. 2023
Ibaraki University

Jun. 2014 - Present, The Physical Society of Japan

Jan. 2024 - Dec. 2024, American Physical Society

Feb. 2022 - May 2023, The Korean Physical Society

Approach from Effective Field Theory to Reveal the Properties of Dark Matter (in Japanese)
Grant-in-Aid for Early-Career Scientists
Ibaraki Univ.
Apr. 2024 - Mar. 2029

Study on the origin of inflation and light dark matter
Oct. 2021 - Feb. 2023

Seeking for the CP-Symmetry Violation Origin of the Universe
Sep. 2019 - Sep. 2021

Exploring Frontiers in Particle Physics and Cosmology　　　　　　　　　　　　　　　
National Tsing Hua University
Aug. 2018 - Jul. 2019

High Energy Physics and Dark Matter (in Japanese)　　　　　　　　　　　　　　
lecturer
Ibaraki Prefectural Hokota First High School, 08 Sep. 2025 - 08 Sep. 2025

Science Career Discovery Bus Tour for Junior and Senior High School Students: Physics Lab Visit　　　　　　　　　　　　　　
presenter
Mito City Gender Equality Division, 29 Jul. 2025 - 29 Jul. 2025

Visiting Lab. (Physics): Science Tour at Science Department, Ibaraki University　　　　　　　　　　　　　　
presenter
Ibaraki prefectural Mito second high school, Ibaraki Univ., 18 Apr. 2025 - 18 Apr. 2025

High Energy Physics and Dark Matter (in Japanese)　　　　　　　　　　　　　　
lecturer
Ibaraki prefectural Mitsukaido high school, 28 Oct. 2024 - 28 Oct. 2024

High Energy Physics and Dark Matter (in Japanese)　　　　　　　　　　　　　　
lecturer
Ibaraki prefectural Hokota first high school, 09 Sep. 2024 - 09 Sep. 2024

Visiting Lab. (Physics): Science Tour at Science Department, Ibaraki University　　　　　　　　　　　　　　
presenter
SSH high school and university connection committee, Ibaraki prefectural Mito second high school, 19 Apr. 2024 - 19 Apr. 2024

「Toshiko Yuasa Laboratory (TYL) スクール 理系女子キャンプ 2016」のパネラー　　　　　　　　　　　　　　
panelist
日仏共同事業：大学共同利用機関法人高エネルギー加速器研究機構・Toshiko Yuasa Laboratory, Apr. 2016