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B Lifetimes And X Y Z States At The Tevatron
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Download or read book B Lifetimes and Mixing written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Tevatron experiments, CDF and D0, have produced a wealth of new B-physics results since the start of Run II in 2001. We've observed new B-hadrons, seen new effects, and increased many-fold the precision with which we know the properties of b-quark systems. In these proceedings, we will discuss two of the most fruitful areas in the Tevatron B-physics program: lifetimes and mixing. We'll examine the experimental issues driving these analyses, present a summary of the latest results, and discuss prospects for the future.
Book Synopsis B-lifetime Measurements at the Tevatron by :
Download or read book B-lifetime Measurements at the Tevatron written by and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the run period from May 1992 to begin of June 1993 the Collider Detector at Fermilab (CDF) has recorded ≈ 21.4 pb−1 of p{anti p} collider data at √s = 1.8 TeV. For this run the detector had been upgraded which significantly enhanced its b-physics capabilities. The upgrades include a high precision Silicon VerteX detector (SVX) which enables CDF to reconstruct the decay vertex and decay length of b-hadrons. In this article the author reports on several measurements of the lifetime of b-flavored hadrons. The determination of the average b-lifetime using inclusive J/??s, the measurement of the B{sup {+-}} and B° lifetimes by reconstructing exclusive final states including a J/? or?(2S) and a measurement of the B{sub s}° meson lifetime exploiting the decay: B{sub s} → l?D{sub s} → l???+ → l?K+K−?+.
Book Synopsis Record of Testimony Taken at the 518th Meeting (open), Held in Cairo, Egypt, on Tuesday, 6 June 1989 by :
Download or read book Record of Testimony Taken at the 518th Meeting (open), Held in Cairo, Egypt, on Tuesday, 6 June 1989 written by and published by . This book was released on 1989 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis B Lifetimes and Mixing at the Tevatron by : Franco Bedeschi
Download or read book B Lifetimes and Mixing at the Tevatron written by Franco Bedeschi and published by . This book was released on 2005 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present recent results on b-hadron lifetimes and mixing obtained from the analysis of the data collected at the Tevatron Collider by the CDF and D0 Collaborations in the period 2002-2004. Many lifetime measurements have been updated since the Summer 2004 conferences, sometimes improving significantly the accuracy. Likewise the measurement of the B{sub d} oscillation frequency has been updated. New limits on the B{sub s} oscillation frequency have been determined using for the first time Run II data.
Download or read book B States at the Tevatron written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CDF and D0 experiments have produced a wealth of heavy flavor physics results since the beginning of RunII of the Fermilab Tevatron. They review recent measurements of B hadron states including excited B states (B**, B{sub s}**) and the B{sub c} meson. They also summarize the discoveries of the [Sigma]{sub b} baryon states and the [Xi]{sub b}− baryon.
Book Synopsis B^0_s and Lambda^0_b Lifetimes and Branching Ratios at the Tevatron by : S. Behari
Download or read book B^0_s and Lambda^0_b Lifetimes and Branching Ratios at the Tevatron written by S. Behari and published by . This book was released on 2006 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors review B{sub s}{sup 0} and {Lambda}{sub b}{sup 0} lifetime and branching ratio measurements from the CDF and D0 experiments at the Tevatron Run II. Using up to 1 fb{sup -1} data samples per experiment, {Lambda}{sub b}{sup 0} lifetime in J/{Psi}{Lambda}{sup 0} decays, B{sub s}{sup 0} lifetime difference in K{sup +}K{sup -} and D{sub s}{sup (*)+} D{sub s}{sup (*)-} decays and B{sub s}{sup 0} branching ratio in D{sub s1}{sup -}(2536){mu}{sup +} {nu}X decays are reported.
Book Synopsis B(S) LIFETIME DIFFERENCE MEASUREMENTS FROM THE TEVATRON. by : K. YIP
Download or read book B(S) LIFETIME DIFFERENCE MEASUREMENTS FROM THE TEVATRON. written by K. YIP and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two collider experiments at the Tevatron, CDF and D0, have made a lot of progress in B{sub s} lifetime difference measurements. Here, they have included 3 different channels of measurements, namely, B{sub s} {yields} J/{psi} + {phi}, B{sub s} {yields} K{sup +}K{sup -} and B{sub s} {yields} D{sub s}{sup (*)+}D{sub s}{sup (*)-}. Combining all the available measurements, they have obtained {Delta}{Lambda}{sub s} = 0.097{sub -0.042}{sup +0.041} ps{sup -1} and {bar {tau}} = 1/{Lambda}{sub s} = 1.461 {+-} 0.030 ps. {Delta}{Lambda}{sub s} is now 2.3 {sigma} away from zero.
Download or read book B Lifetimes at CDF. written by and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the average b-hadron lifetime using inclusive B → J/[psi]X events, the individual B{sub u} and B{sub d} lifetimes and their ratio using exclusive B → [psi]K events, and the B{sub s} lifetime using semileptonic B{sub s} lifetime using semileptonic B{sub s} → l[nu]D3X events are presented. The results were obtained from a 21.3 pb−1 sample of √s = 1.8 TeV {bar p}p collisions collected in 1992--93 at the Fermilab Tevatron collider and required the precise position measurements of the recently installed CDF silicon vertex detector.
Book Synopsis B0(s) Mixing and Decays at the Tevatron by :
Download or read book B0(s) Mixing and Decays at the Tevatron written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This short review reports on recent results from CDF and D0 experiments at the Tevatron collider on B°{sub s} mixing and the lifetimes of B°{sub s} and [Lambda]{sub b}.
Download or read book B States and Lifetimes at CDF. written by and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurements at CDF of the masses and lifetimes of weakly decaying B hadrons are described. 11 refs., 2 figs.
Book Synopsis B(c) and Excited B States by : Remigius K. Mommsen
Download or read book B(c) and Excited B States written by Remigius K. Mommsen and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper recent results from the CDF and D0 experiments on heavy flavor spectroscopy are reported. Both experiments are using up to 1.1 fb{sup -1} of data delivered by the Tevatron proton-antiproton collider at the Fermi National Accelerator Laboratory, Batavia, IL, USA. The CDF and D0 detectors are described in references [1,2].
Book Synopsis Measurement of the ?0b Lifetime in ?0b {u2192} ?+c?- Decays at the Collider Detector at Fermilab by :
Download or read book Measurement of the ?0b Lifetime in ?0b {u2192} ?+c?- Decays at the Collider Detector at Fermilab written by and published by . This book was released on 2008 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetime of the ?0b baryon (consisting of u, d and b quarks) is the theoretically most interesting of all b-hadron lifetimes. The lifetime of ?0b probes our understanding of how baryons with one heavy quark are put together and how they decay. Experimentally however, measurements of the ?0b lifetime have either lacked precision or have been inconsistent with one another. This thesis describes the measurement of ?0b lifetime in proton-antiproton collisions with center of mass energy of 1.96 TeV at Fermilab's Tevatron collider. Using 1070 ± 60pb-1 of data collected by the Collider Detector at Fermilab (CDF), a clean sample of about 3,000 fully-reconstructed ?0b →?c+?- decays (with ?+c subsequently decaying via ?+c → p+ K- ?+) is used to extract the lifetime of the ?0b baryon, which is found to be c?(?0b) = 422.8 ± 13.8(stat) ± 8.8(syst)?m. This is the most precise measurement of its kind, and is even better than the current world average. It also settles the recent controversy regarding the apparent inconsistency between CDF's other measurement and the rest of the world.
Download or read book B Physics at the Tevatron written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting in September 1999, a series of workshops was carried out to study the prospects for B physics at the Tevatron. There were four working groups covering CP Violation, Rare and Semileptonic Decays, Mixing and Lifetimes, as well as Production, Fragmentation and Spectroscopy. Upon the completion of a comprehensive written report summarizing the results of this workshop, we will review the highlights of B Physics at the Tevatron in Run II and beyond. On our way to this goal, we will pass by questions such as 'Why are there so many B factories these days?' or 'Why do we also want to do B Physics at Fermilab'.
Book Synopsis Recueil factice de coupures de presse parues dans la Gazette de l'Hôtel Drouot, relatives à des ventes aux enchères publiques, ayant eu lieu du 4 juin au 28 septembre 1930. Paris et province by :
Download or read book Recueil factice de coupures de presse parues dans la Gazette de l'Hôtel Drouot, relatives à des ventes aux enchères publiques, ayant eu lieu du 4 juin au 28 septembre 1930. Paris et province written by and published by . This book was released on 1930 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis B-lifetime Measurements at CDF. by :
Download or read book B-lifetime Measurements at CDF. written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average b-hadron lifetime has been measured using a high statistics sample of B → J/?X decays recorded with the Collider Detector at Fermilab. The decay vertices of J/? →??− candidates have been reconstructed using information from a silicon vertex-detector. The measured B lifetime, which is the average over all b-hadrons produced in p{bar p} collisions at √s = 1.8 TeV, weighted by their branching ratios into J/? is:?B = 1.46 ± 0.06(stat.) ± 0.06(sys.)ps (preliminary); In addition we used the fully reconstructed final states B{sup ±} → J/?K{sup ±} and B° → J/?K°* to measure the exclusive lifetime of charged and neutral B-mesons. We measure:?{sub B}{sup ±} = 1.59 ± 0.27(stat.) ± 0.17(sys.) ps (preliminary);?{sub B}° = 1. 34 ± 0.31 (stat.) {plus_minus} 0.17 (sys.) ps (preliminary); From this we obtain the following result for the lifetime ratio:?{sub B}{sup {plus_minus}}/? {sub B}° = 1.19 {plus_minus} 0.35(stat.) {plus_minus} 0.12(sys.) (preliminary); This represents the first measurements of the b-lifetime at a hadron collider.
Download or read book Heavy Flavours written by A J Buras and published by World Scientific. This book was released on 1992-11-26 with total page 803 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of review articles on the most outstanding topics in heavy flavour physics. All the authors have made significant contributions to this field. The book reviews in detail the theoretical structure of heavy flavour physics within the Standard Model and its confrontation with existing experimental data.The physics of the top quark and of the Higgs play an important role in this volume. Beginning with radiative electroweak corrections and their impressive tests at LEP and hadron colliders, the book summarizes the present status of quark mixing, CP violation and rare decays. The dynamics of exclusive D- and B-meson decays, the τ-lepton physics and the newly discovered heavy quark symmetries are discussed in detail. The impact of strong interactions on weak decays is clearly visible in many articles. The physics of heavy flavours at LEP, HERA and hadron colliders constitutes an important part of the book. Another significant topic is the possible role of heavy flavours in the spontaneous symmetry breaking of gauge symmetries. Finally the most recent advances in lattice calculations of the properties of heavy flavours and the lattice studies of the dynamics of heavy flavours are presented.
Book Synopsis Higgs Boson Decays into a Pair of Bottom Quarks by : Cecilia Tosciri
Download or read book Higgs Boson Decays into a Pair of Bottom Quarks written by Cecilia Tosciri and published by Springer Nature. This book was released on 2021-10-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
