https://scholars.lib.ntu.edu.tw/handle/123456789/574616
標題: | Search for a Light CP -odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment | 作者: | Seong I.S. et al. Vahsen, S.E. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Bakich, A.M. Bansal, V. PAO-TI CHANG WEI-SHU HOU |
關鍵字: | Galaxies; Particle beams; Belle experiments; Branching fractions; Dark matter; Data sample; Final state; Higgs boson; Missing energy; Single photons; Bosons | 公開日期: | 2019 | 卷: | 122 | 期: | 1 | 來源出版物: | Physical Review Letters | 摘要: | We report on the first Belle search for a light CP-odd Higgs boson, A0, that decays into low mass dark matter, χ, in final states with a single photon and missing energy. We search for events produced via the dipion transition (2S)→ (1S)π+π-, followed by the on-shell process (1S)→γA0 with A0→χχ, or by the off-shell process (1S)→γχχ. Utilizing a data sample of 157.3×106 (2S) decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges MA0<8.97 GeV/c2 and Mχ<4.44 GeV/c2. 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/c2. ? 2019 authors. Published by the American Physical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059832635&doi=10.1103%2fPhysRevLett.122.011801&partnerID=40&md5=f2b31d4c2e422dfdd1d41cd4de0f8d17 https://scholars.lib.ntu.edu.tw/handle/123456789/574616 |
ISSN: | 319007 | DOI: | 10.1103/PhysRevLett.122.011801 |
顯示於: | 物理學系 |
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