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Languages : en
Pages : 4
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A summary of recent results on B rare decays from the CDF and D0 experiments operating in Run II of the Fermilab Tevatron is given; analyzed decay modes are B{sub d, s} → hh, B{sub d, s} →??−, and B →?+?− h. Data samples are relative to 1 fb−1 or more integrated luminosity of p{bar p} collisions at √s = 1.96 TeV. All reported results are in agreement with Standard Model predictions and consistent with B-Factories analyzes.
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Languages : en
Pages : 4
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Book Description
A summary of recent results on B rare decays from the CDF and D0 experiments operating in Run II of the Fermilab Tevatron is given; analyzed decay modes are B{sub d, s} → hh, B{sub d, s} →??−, and B →?+?− h. Data samples are relative to 1 fb−1 or more integrated luminosity of p{bar p} collisions at √s = 1.96 TeV. All reported results are in agreement with Standard Model predictions and consistent with B-Factories analyzes.
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Languages : en
Pages : 4
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Both CDF and D0 experiments have been searching for evidence of physics beyond the standard model (SM) using the Tevatron p{bar p} collider at Fermilab. We report on recent searches in the B flavor sector, especially decays via flavor changing neutral current processes (FCNC), B{sub (s)}° → e?− and B{sub s}° →?+?−, at the Tevatron.
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Languages : en
Pages : 6
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With data samples of up to 2 fb−1 of p[bar p] interactions at [square root]s = 1960 GeV, the CDF and D0 experiments are beginning to make precision measurements of the lifetime of bottom hadrons not produced in ee− colliders operating at the [Upsilon](4S) and set limits on the branching ratios of many decay modes that are predicted to be rare or forbidden under the standard model. Both sets of measurements are providing limits on physics beyond the standard model.
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Languages : en
Pages : 192
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The experimental study of rare decays of hadrons containing the b quark has been a fertile ground for some time, and keeps being one of the most interesting subjects in high energy physics. It has improved our understanding of hadronic processes, and allows investigating various aspects of the Standard Model and searching for hints of physics beyond the Standard Model. Examples are the comparison of branching fractions of charmless modes with predictions of models, the constraints on CKM angles (B0 → [pi]+[pi]-, B → DK, with D in suppressed modes), the observation of purely leptonic modes (B± → [tau]±v), the recently established difference in ACP between B0 → K+[pi]- and B± → K±[pi]0, suspected to be a hint new physics. All of them came from a long and successful experimental activity with e+e- collisions at the Y(4S) resonance. With hadronic colliders now coming into play, the study of rare decays is reaching new heights. Given the high cross section for production of all kinds of B hadrons, the record luminosities now provided by the Tevatron collider, and the LHC program in view for the next years, there is the potential for a rich program of interesting new measurements, including even rarer modes as the Bs0 → [mu]+[mu]-, strongly suppressed in the standard model but very sensitive to many NP scenarios. The complexity of the hadronic collision environment, however, requires detectors with high precision and high quality tracking, and a trigger system capable of complex event selections at high rates. The CDF experiment, thanks to a fast trigger on impact parameter, has been able to reconstruct many rare B decays, including previously unobserved modes Bs0 → K+K- and Bs0 → K-[pi]+, the latter being particularly interesting for its relationship with the puzzling difference in CP asymmetry between neutral and charged modes. In this thesis we go beyond B mesons, and present the first measurements of Branching fractions and CP asymmetries in charmless b-baryon modes. We study two-body [Lambda]b0 decays into final states with a proton and a charged pion or kaon. Their branching fractions can be significantly affected by New Physics contributions; under supersymmetric models with R-parity violation, they can be increased by two orders of magnitude. Their CP-violating asymmetries are also interesting to measure in search for possible further anomalies: then may reach significant size O(30%) in the Standard Model, and are also sensitive to possible new physics sources.
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Languages : en
Pages : 8
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Studying flavor changing neutral current transitions provides important information that helps searches for physics beyond the standard model. In this paper we report on recent measurements of these transitions using data collected by the CDF and D0 experiments at the Tevatron p{bar p} collider, including world-leading limits on the branching fraction of the decay B{sub (s)}° →??−, a forward-backward asymmetry measurement in B° → K*°?+?− and B+ → K+?+?− decays which is consistent and competitive with best B-factories results, and the first observation of the decay B{sub s}° →??+?−.
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Languages : en
Pages : 6
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In this proceeding we report the most recent results from the CDF and D0 collaborations on the rare decays of b-mesons. The presented results show a new D0 limit for?(B{sub s}° →??−) that represent the best single measurement on this mode so far, an update of the?(B{sub s}° →??) with, for the first time, an angular analysis on the final state, a new measurement of the?(B° → K*°?+?−) and?(B+ → K+?+?−) with an interesting measurement on the forward-backward asymmetry for those channels and the first observation of the?(B{sub s}° →??+?−).
Author: Ralf Patrick Bernhard
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Languages : en
Pages : 5
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Languages : en
Pages :
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The CDF and D0 experiments at the Tevatron pp collider established that extensive and detailed exploration of the b-quark dynamics is possible in hadron collisions, with results competitive and supplementary to B-factories. In this paper we review the current state of Tevatron's heavy flavor measurements considering two main categories: searches for non standard model physics (results on rare decays and CP-violation) and determinations of standard model parameters (annihilation in B 2!hh− decays and? angle measurement through B 2!DK modes).
![B, Lambda[sub B] and Charm Results from the Tevatron PDF](https://books.google.com/books/content/images/frontcover/KdgLkAEACAAJ?fife=w80-h100)
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Languages : en
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Recent results on B[sub d], B[sub u][sup[+-]], B[sub s], [Lambda][sub b] and Charm hadrons are reported from[approx] 75 pb[sup -1] and[approx] 40 pb[sup -1] of data accumulated at the upgraded CDF and D0 experiments at the Fermilab Tevatron[bar p]-p collider, during Run-II. These include lifetime and mass measurements of B and Charm hadrons, searches for rare decays in charm and B hadrons and CP-violation in Charm decays. Results relevant to CP-violation in B-decays are also reported.
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Languages : en
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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.
