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Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment

Title
Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment
Author
천병구
Issue Date
2019-01
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 122, NO 1, 011801
Abstract
We report on the first Belle search for a light CP-odd Higgs boson, A(0), that decays into low mass dark matter, chi, in final states with a single photon and missing energy. We search for events produced via the dipion transition (sic)(2S) -˃ (sic)(1S)pi(+)pi(-), followed by the on-shell process (sic)(1S) -˃ gamma A(0) with A(0) -˃ chi chi, or by the off-shell process (sic)(1S) -˃ gamma chi chi. Utilizing a data sample of 157.3 x 10(6) (sic)(2S) decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges M-A0 ˂ 8.97 GeV/c(2) and M-chi ˂ 4.44 GeV/c(2). We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/c(2).
URI
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.011801https://repository.hanyang.ac.kr/handle/20.500.11754/126350
ISSN
0031-9007; 1079-7114
DOI
10.1103/PhysRevLett.122.011801
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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