期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP02(2022)042
关键词
Beyond Standard Model; Heavy Quark Physics; GUT
资金
- KIAS Individual Grant via the Quantum Universe Center at Korea Institute for Advanced Study [QP084401]
- National Research Foundation of Korea [NRF-2019R1A2C1009419]
- Sao Paulo Research Foundation (FAPESP) [2015/20570-1]
- DFG via the Collaborative Research Center [TRR 257]
- RFBR
- CNRS [20-52-15005]
- F.R.S.-FNRS
- AAP-USMB grant
- Interdisciplinary Scientific and Educational School of Moscow University for Fundamental and Applied Space Research
- National Science Foundation [PHY-1915147]
- Generalitat Valenciana (Spain) through the plan GenT program [CIDEGENT/2019/068]
- Spanish Government (Agencia Estatal de Investigacion)
- ERDF funds from European Commission (MCIN/AEI) [PID2020-114473GB-I00]
- National Research Foundation of Korea [QP084401] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The measured branching fractions of B-mesons into leptonic final states suggest lepton flavour universality violation. This study explores the possibility of introducing a scalar leptoquark S-1 to explain this anomaly and also serve as a mediator between the Standard Model and a dark sector. Various constraints from collider searches, direct detection experiments, and the dark matter relic abundance are considered. The results highlight the importance of understanding the decay of pairs of leptoquarks into different final states for identifying the underlying dynamics.
The measured branching fractions of B-mesons into leptonic final states derived by the LHCb, Belle and BaBar collaborations hint towards the breakdown of lepton flavour universality. In this work we take at face value the so-called R-D(()*()) observables that are defined as the ratios of neutral B-meson charged-current decays into a D-(*())-meson, a charged lepton and a neutrino final state in the tau and light lepton channels. A well-studied and simple solution to this charged current anomaly is to introduce a scalar leptoquark S-1 that couples to the second and third generation of fermions. We investigate how S-1 can also serve as a mediator between the Standard Model and a dark sector. We study this scenario in detail and estimate the constraints arising from collider searches for leptoquarks, collider searches for missing energy signals, direct detection experiments and the dark matter relic abundance. We stress that the production of a pair of leptoquarks that decays into different final states (i.e. the commonly called mixed channels) provides critical information for identifying the underlying dynamics, and we exemplify this by studying the t tau b nu and the resonant S-1 plus missing energy channels. We find that direct detection data provides non-negligible constraints on the leptoquark coupling to the dark sector, which in turn affects the relic abundance. We also show that the correct relic abundance can not only arise via standard freeze-out, but also through conversion-driven freeze-out. We illustrate the rich phenomenology of the model with a few selected benchmark points, providing a broad stroke of the interesting connection between lepton flavour universality violation and dark matter.
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