Download CP Violation in {B_s}^0 -> J/psi.phi Decays: Measured by Sabato Leo (auth.) PDF

By Sabato Leo (auth.)

This thesis reviews at the ultimate dimension of the flavor-mixing section in decays of strange-bottom mesons (B_s) into J/psi and phi mesons played in high-energy proton-antiproton collisions recorded through the Collider scan at Fermilab. Interference happens among direct decays and decays following digital particle-antiparticle transitions (B_s-antiB_s). The section distinction among transition amplitudes (“mixing phase”) is observable and intensely delicate to contributions from non-standard-model debris or interactions that could be very not easy to observe in a different way – a proven fact that makes the right size of the B_s blending part essentially the most vital pursuits of particle physics. the consequences provided contain an exact choice of the blending part and a set of different vital supplementary effects. All measurements are one of the such a lot unique to be had from a unmarried scan and supply considerably better constraints at the phenomenology of recent debris and interactions.

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Additional info for CP Violation in {B_s}^0 -> J/psi.phi Decays: Measured with the Collider Detector at Fermilab

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B 475, 111 (2000) 24. I. Dunietz, Bs − B¯ s mixing, CP violation and extraction of CKM phases from untagged Bs data samples. Phys. Rev. D52, 3048 (1995) arXiv:hep-ph/9501287 [hep-ph] 25. Y. Amhis et al. 1158 [hep-ex]. edu/xorg/hfag 26. A. 1444 [hep-ph] 27. B. Bhattacharya, A. Datta, D. London, Reducing penguin pollution. Int. J. Mod. Phys. 1413 [hep-ph] 28. X. Liu, W. Wang, Y. 0313 [hep-ph] 29. S. Faller, R. Fleischer, T. Mannel, Precision physics with Bs0 → J/ψφ at the LHC: the quest for new physics.

An angular analysis is required to statistically separate the various components and enhance sensitivity to the mixing phase. An accurate description of the detector effects on reconstructed particle angular distribution is needed. As in the B 0 → J/ψK S case, sensitivity to the phase is obtained by separately tracking the time evolution of the initially produced Bs0 and B¯ s0 mesons using flavortagging. Development and calibration of flavor tagging algorithms is particularly challenging in hadron collider experiments, because of large QCD backgrounds and complicated event topologies.

Charged particles left small ionization energy depositions as they passed through the layers of the tracking system. Using a set of spatial measurements of these depositions (“hits”), pattern recognition and kinematic fitting algorithms reconstructed the particle’s original trajectory measuring the parameters of the helicoidal trajectory d ψ d ψ The rapidity can be derived from the Lorentz-invariant cross-section: E (dp) 3 = E τpT dpT dpz . Observing that only E and pz change under z boosts, we can replace them by a variable Y such as dY E dp = 1.

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