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Phenomenological Studies Of Annihilation Corrections In (B|)-_s~0Non-leptonic Decays Within QCD Factorization

Posted on:2014-01-07Degree:MasterType:Thesis
Country:ChinaCandidate:X W CuiFull Text:PDF
GTID:2250330401967538Subject:Particle Physics and Nuclear Physics
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B meson physics is one of the currently active researching fields of particle physics. It is importment for testing SM, pursuing the origin of the CP violation and searching for possible NP signal. In experiment, two high brightness B meson factory Belle and BABAR discovered and proved CP violation in B meson system during last few years, accurate measurement of Bu and Bd decay in these two high brightness B meson factory make the B meson physics research in the past ten years have made a lot of progress.The same as Bu and Bd,the reaserch of Bs will become one of the important direction in B meson physics. The present experimental data of Bs decay mainly comes from experimental group CDF and D0, which is located in the United States Fermi national laboratory Tevatron Run II. With the run of LHC (European large hadron collider), LHC-b can produce plenty of Bs, this will provide sufficient experimental data for our study of the Bs. In theory, the decay of Bs contains extremely rich physical information, can not only reveal short strong interaction, accurately explore CP violation, rare decay and some flavor change neutral current process (FCNC), but also seek evidence of new physical.Therefore, the research of Bs meson is a very hot field in recent years.In this paper, we use QCDF method to recalculate some weak decay of B0s meson. In our calculation, we reconsider the contribution of the hard spectator and annihilation corrections, which always suffer from the end-point divergence. To deal with the end-point divergence, We adopt two schemes, the first one is to conservatively estimate the possible contributions by parameterization, another one uses an infrared finite gluon propagator to regulate the end-point singularity. In scheme one, with the constraints from the measured B0sâ†'PP,VV decays, two (four) restricted solutions of the parameters spaces are found. In scheme two, we find that most of the theoretical predictions agree well with the experimental data with single parameter mg≈0.5GeV. However, within both schemes, Br(Bsâ†'φφ)are always much larger than Br(B0sâ†'K*0K*0), and the LHC-b and the CDF measurements Br(B0sâ†'φφ)≈Br(B0sâ†'K*0K*0)is very hard to be accommdated. The further refined measurements and theoretical studies are required to resolve such a possible anomaly.
Keywords/Search Tags:QCDF, (?)meson, the end-point divergence, branching ratio, ACP
PDF Full Text Request
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