Monte Carlo studies of rare decay of B-mesons
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
The rare decays of B mesons are sensitive to physics processes outside the Standard Model
and are an important probe in exploring quantum chromodynamics (QCD). The branching
fraction of rare decay mode is an interesting quantity to measure because the contribution
from physics beyond Standard Model may be sizable in rare decay mode. Possible new
physics enhancements of B0→J/ψγ decay rate include a right handed charged current or non–
spectator intrinsic charm in B0 meson. In radiative annihilation decay of B0→J/ψγ, the
dominant mechanism is the exchange of W bosons and the radiation of a photon from the
light quark of B mesons. The decay of B0→J/ψγ→e+e-/µ+µ- and the reconstruction of B0
mesons is the valid test for the measurement of time–dependent CP violating asymmetries.
The data used in this analysis has been collected from Belle Detector at asymmetrical e+e-
collider working at ϒ(4S) resonance with a Lorentz Boost (βγ) of 0.425. A signal Monte
Carlo 100,000 events are generated by EvtGen to calculate reconstruction efficiency and for
background estimation. The reconstruction efficiency of B0→J/ψγ calculated from ∆E is
27.58 ± 0.2% and 27.96 ± 0.2% from Mbc. In this decay mode, the obtained background
estimates of 3.7 events for B0→J/ψπº mode and 0.8 for B0→J/ψKL, resulting in total
background of 4.5 ± 1.1 events. On comparing Monte Carlo continuum on-resonance and
experimental off-resonance data, no significant contribution from continuum background was
found.
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