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CP-violating Higgs boson ditau decays: Baryogenesis and Higgs factories

Ge, Shao-Feng and Li, Gang and Pasquini, Pedro and Ramsey-Musolf, Michael J. (2021) CP-violating Higgs boson ditau decays: Baryogenesis and Higgs factories. Physical Review D, 103 (9). Art. No. 095027. ISSN 2470-0010. doi:10.1103/physrevd.103.095027.

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We demonstrate how probes of CP-violating observables in Higgs boson ditau decays at prospective future lepton colliders could provide a test of weak scale baryogenesis with significant discovery potential. Measurements at the Circular Electron Positron Collider, for example, could exclude a CP phase larger than 2.9° (5.6°) at 68% (95%) C.L. assuming the Standard Model value for magnitude of the tau lepton Yukawa coupling. Conversely, this sensitivity would allow for a 5σ discovery for 82% of the CP phase range [0,2π). The reaches of the Future Circular Collider for electrons and positrons (FCC-ee) and International Linear Collider are comparable. As a consequence, future lepton colliders could establish the presence of CP violation required by lepton flavored electroweak baryogenesis with at least 3σ sensitivity. Our results illustrate that Higgs factories are not just precision machines, but can also make O(1) measurement of the new physics beyond the Standard Model.

Item Type:Article
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URLURL TypeDescription Paper
Li, Gang0000-0003-2232-5140
Pasquini, Pedro0000-0002-1689-442X
Ramsey-Musolf, Michael J.0000-0001-8110-2479
Alternate Title:CP-violating Higgs Di-tau Decays: Baryogenesis and Higgs Factories
Additional Information:© 2021 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. (Received 22 January 2021; accepted 26 March 2021; published 26 May 2021) S. F. G. is sponsored by the Double First Class start-up fund (WF220442604) provided by Tsung-Dao Lee Institute and Shanghai Jiao Tong University, the Shanghai Pujiang Program (20PJ1407800), and National Natural Science Foundation of China (No. 12090064). S. F. G. is also grateful to Kai Ma for sharing his Ph.D. thesis with derivations on the differential distribution of the τ→πν_τ decay as well as Manqi Ruan, Xin Chen, and Dan Yu for useful discussions. G. L. would like to thank Shou-hua Zhu for helpful discussions. M. J. R. M. was supported in part under National Natural Science Foundation of China Grant No. 19Z103010239. G. L. and M. J. R. M. were supported in part under U.S. Department of Energy Award No. DE-SC0011095. This work is also supported in part by Chinese Academy of Sciences Center for Excellence in Particle Physics (CCEPP).
Funding AgencyGrant Number
Tsung-Dao Lee InstituteWF220442604
Shanghai Pujiang Program20PJ1407800
National Natural Science Foundation of China12090064
National Natural Science Foundation of China19Z103010239
Department of Energy (DOE)DE-SC0011095
CAS Center for Excellence in Particle PhysicsUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20210527-093457313
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109277
Deposited By: George Porter
Deposited On:27 May 2021 20:13
Last Modified:27 May 2021 23:00

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