Prospects for Measuring CP Violation, BZero {sub S} Mixing and Rare B Decays at the Tevatron PDF Download
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We review the status of current B mixing and CP violation measurements from the Fermilab Tevatron. With the existing data sample, the CDF collaboration has made competitive measurements of B{sub d}° mixing; set limits on B{sub s}° mixing and has begun a direct search of CP violation in the B system through the decay B°/{anti B}°→J/[psi]K{sub S}°. The prospects for future b measurements at the Tevatron, including CP violation, B{sub s}° mixing and rare decay searches are discussed.
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The Fermilab Tevatron Collider is currently the most copious source of b-hadrons, thanks to the large b{bar b} production cross-section in 1.96 TeV p{bar p} collisions. Recent detector upgrades allow for a wide range of CP violation and flavor-mixing measurements that are fully competitive (direct asymmetries in self-tagging modes) or complementary (asymmetries of B{sub s} and b-baryons decays) with B-factories. In this paper we review some recent CP violation results from the D0 and CDF II Collaborations and we discuss the prospects for future measurements.
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Over two decades since its discovery at Fermilab in 1977, the b quark has become an important laboratory for the exploration of the Standard Model as well as a potential window beyond it. Its kinematic properties, its large mass and long lifetime, and its large production cross section in hadron collisions, make it an excellent subject of study at the Tevatron {bar p}p collider. In this article, we will review recent results from CDF and D0 in two categories of tests of the Standard Model: the search for rare b decays, and the measurement of asymmetry parameters related to B° meson mixing and CP violation. The detectors have been described elsewhere. The data for the results presented here are from the 1992-96 collider run, representing at each experiment, approximately 100 pb−1 of integrated luminosity at (square root)s = 1.8 TeV.
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Languages : en
Pages : 8
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The authors report the results of the search for flavor changing-neutral current (FCNC) decays b → s??− and the observation of B{sub c}+ mesons at Tevatron.
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Between 1992 to 1996, the CDF and D0 detectors each collected data samples exceeding 100 pb−1 of p{bar p} collisions at √s = 1.8 TeV at the Fermilab Tevatron. These data sets led to a large number of precision measurements of the properties of B hadrons including lifetimes, masses, neutral B meson flavor oscillations, and relative branching fractions, and to the discovery of the B0 meson. Perhaps the most exciting result was the first look at the CP violation parameter sin ({vert_bar}2[beta]){vert_bar} using the world's largest sample of fully reconstructed B°/{bar B}° → J/[psi]K{sub s}° decays. A summary of this result is presented here. In the year 2000, the Tevatron will recommence p{bar p} collisions with an over order of magnitude expected increased in integrated luminosity (1 fb−1 per year). The CDF and D0 detectors will have undergone substantial upgrades, particularly in the tracking detectors and the triggers. With these enhancements, the Tevatron B physics program includes precision measurements of sin(2[beta]) and B{sub s}° flavor oscillations, as well as studies of rare B decays that are sensitive to new physics. The studies of B{sub s}° mesons will be particularly interesting as this physics will be unique to the Tevatron during the first half of the next decade.
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B° mixing measurements from the Tevatron Run I data are reported. These include time-integrated measurements of the average mixing pa- rameter {bar {chi}}, six time-dependent oscillation measurements of [Delta]m{sub d}, and a time-dependent limit on [Delta]m{sub s}. Such measurements provide constraints on CKM matrix elements. A sample of B°/{anti B}° → J/[psi]K°{sub S} decays is used to directly measure the CP -violation parameter sin(2[beta]). This value agrees well with indirect constraints on the CKM matrix.
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Languages : en
Pages : 8
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Measurements of meson mixing and CP violation parameters obtained by the CDF and D0 experiments at the Fermilab Tevatron are presented. These include results on B{sub s} and D meson mixing, and searches for CP violation in the decay B 2!J/[psi]K, in mixing through semileptonic B{sub s} meson decays, and in the interference between mixing and decay in the process B{sub s} 2!J/[psi][phi].
Author: Sabato Leo
Publisher: Springer
ISBN: 3319079298
Category : Science
Languages : en
Pages : 146
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This thesis reports on the final measurement of the flavor-mixing phase in decays of strange-bottom mesons (B_s) into J/psi and phi mesons performed in high-energy proton-antiproton collisions recorded by the Collider Experiment at Fermilab. Interference occurs between direct decays and decays following virtual particle-antiparticle transitions (B_s-antiB_s). The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non-standard-model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics. The results presented include a precise determination of the mixing phase and a suite of other important supplementary results. All measurements are among the most precise available from a single experiment and provide significantly improved constraints on the phenomenology of new particles and interactions.
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The authors present six time-dependent B[sub d][sup 0] mixing measurements of[Delta]m[sub d] from the CDF Run I data. The CDF average is[Delta]m[sub d]= .494[sub[+-] 0.26][sup[+-] 0.26](ps)[sup[minus]1]. They also present a measurement of the CP-violating asymmetry sin (2[beta]) using a sample of B[sup 0]/[bar B][sup 0][r-arrow] J/[psi]K[sub s][sup 0] decays and report sin(2[beta])= .79[sub[minus].44][sup+.41].
