2011 Fiscal Year Final Research Report
Precise measurements of b quark's electro-magnetic rare decays using dimuon and two charged track triggers
| Project/Area Number |
22740139
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
MIYAKE Hideki 筑波大学, 数理物質系, 研究員 (20403115)
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| Project Period (FY) |
2010 – 2011
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| Keywords | B中間子 |
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| Research Abstract |
We study the decays B→K^<(*)>μμ, B_s^0→φ(1020)μμ, and Λ_b→Λμμ, which are proceeded via b→sμμ electro-magnetic rare decays. In addition to the first observation of Λ_b→Λμμ decays, we perform the measurement of total and differential branching ratios of the decays as a function of squared dimuon mass. The transverse polarization asymmetry A_T^<(2)> and the time-reversal-odd charge-and-parity asymmetry A_<im> are measured for the first time, together with the K^* longitudinal polarization fraction F_L and the muon forward-backward asymmetry A_<FB>. All of the results are consistent with the standard model.
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