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Inclusive Rare B Decays Using Effective Field Theories Microform
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Author :Christian Bauer Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612538320 Total Pages :117 pages Book Rating :4.5/5 (383 download)
Book Synopsis Inclusive Rare B Decays Using Effective Field Theories [microform] by : Christian Bauer
Download or read book Inclusive Rare B Decays Using Effective Field Theories [microform] written by Christian Bauer and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2000 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive Rare B Decays Using Effective Field Theories by :
Download or read book Inclusive Rare B Decays Using Effective Field Theories written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive Rare B Decays Using Effective Field Theories by : Christian Bauer
Download or read book Inclusive Rare B Decays Using Effective Field Theories written by Christian Bauer and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we will discuss several properties of rare decays of ' B' mesons. First we discuss properties of the inclusive radiative decay 'B¢' [right arrow] 'Xs'ã, where 'Xs' stands for any hadronic state containing an 's' quark. We extend previous studies of this decay, which included perturbative corrections to order Ã's' and nonperturbative contributions up to order ([Lambda]QCD/' mb')2 and calculate the O ([Lambda]QCD/'mb')3 contributions to this decay. The values of the nonperturbative parameters entering at this order are unknown, leading to uncertainties in the standard model prediction of this decay. We estimate the size of these nonperturbative uncertainties by varying these parameters in the range suggested by dimensional analysis. We also estimate uncertainties arising from a cut on the photon energy which is required experimentally. Another decay mode investigated is 'B¢' [right arrow] ' Xs'3⁄4+3⁄4-. We study the O ([Lambda]QCD/'mb')3 contributions to the leptonic invariant mass spectrum, the forward-backward asymmetry and hadronic invariant mass moments and estimate the resulting uncertainties. We calculate how the size of these uncertainties depend on the value of an experimental cut that has to be applied to eliminate the large background from other 'B' decays. A model independent way to determinate the CKM matrix element @' Vub'@ from the dilepton invariant mass spectrum of the inclusive decay B[right arrow]Xu3⁄4+ n is presented next. We show that cuts required to eliminate the charm background still allow for a theoretically clean way to determine the CKM matrix element @'Vub'@. We also discuss the utility of the 'B¢' [right arrow] 'Xs'3⁄4 +3⁄4- decay rate above the y (2'S') resonance to reduce the resulting uncertainties. Finally, we introduce a novel effective theory valid for highly energetic particles. In decays where the phase space is sufficiently restricted such that final state particles have very high energies compared to their mass, the perturbative as well as nonperturbative series diverge. The effective theory presented allows to sum perturbative Sudakov logarithms in a framework that also incorporates the nonperturbative physics in such limits of phase space.
Book Synopsis Effective Field Theories for Inclusive B Decays by : Keith Seng Mun Lee
Download or read book Effective Field Theories for Inclusive B Decays written by Keith Seng Mun Lee and published by . This book was released on 2006 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) This resolves the conflict between what is suitable in each of these regions. Finally, we use these results to calculate the fraction of the total rate that is measured in the presence of a cut on the hadronic invariant mass, mx. We find that the effect of this cut depends strongly on the value of mt and is approximately universal for all short-distance contributions. This feature can be exploited to minimize hadronic uncertainties and thereby maintain sensitivity to new physics.
Book Synopsis Present Status of Inclusive Rare B Decays by :
Download or read book Present Status of Inclusive Rare B Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a status report on inclusive rare B decays, highlighting recent developments and open problems. We focus on the decay modes B[yields] X[sub s, d][gamma], B[yields] X[sub s][ell][sup+][ell][sup -] and B[yields] X[sub s][nu][bar[nu]]and on their role in the search for new physics. Most of the inclusive rare B decays are important modes of flavour physics due to the small hadronic uncertainties. They can be regarded as laboratories to search for new physics. We collect the experimental data already available from CLEO and the B factories BABAR and BELLE. We review the NLL and NNLL QCD calculations of the inclusive decay rates that were recently completed, and discuss future prospects, especially the issue of the charm mass scheme ambiguity. Finally, we analyze the phenomenological impact of these decay modes, in particular on the CKM phenomenology and on the indirect search for supersymmetry. We also briefly discuss direct CP violation in inclusive rare B decays, as well as the rare kaon decays K[sup+][yields][pi][sup+][nu][bar[nu]] and K[sub L][yields][pi][sup 0][nu][bar[nu]], which offer complementary theoretically clean information.
Download or read book B Decays written by Sheldon Stone and published by World Scientific. This book was released on 1992 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of b quarks has now reached a stage where it is useful to review what has been learned so far and also to look at the implications of future studies. The most important observations thus far measurement of the B lifetime, B0 B0 mixing, and the observation of b? u transitions, as well as more mundane results on hadronic and semileptonic transitions are described in detail by experimentalists who have been closely involved with the measurements. Theoretical progress in understanding b quark decays, including the mechanisms of hadronic and semileptonic decays, are described. Synthesizing the experimental and theoretical information, the authors discuss tests of the standard model and measurements of standard model parameters. Possibilities of more extensive tests using measurement of CP violation in the B system are also addressed.
Book Synopsis Weak Decay Studies from an Effective Theory Standpoint by : Aditya Yechan Gunja
Download or read book Weak Decay Studies from an Effective Theory Standpoint written by Aditya Yechan Gunja and published by . This book was released on 2014 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this doctoral dissertation I discuss the phenomenology of some weak interaction decays using a model independent approach by employing effective field theories. I discuss the soft photon contribution and background effect to the rare dimuonic decay of the neutral B meson. I also study some radiative exclusive W boson decays in the standard model in the context of pQCD and SCET. Additionally I invoke leptonic decays of charged mesons to constrain two general models of light dark matter.
Book Synopsis B Decays (Revised 2nd Edition) by : Sheldon Stone
Download or read book B Decays (Revised 2nd Edition) written by Sheldon Stone and published by World Scientific. This book was released on 1994-08-01 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of 'B Decays”. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of “Penguin” mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the “Standard Model” and how further tests can be done using measurements of CP violation in the B system.
Book Synopsis Large Charmless Yield in B Decays and Inclusive B Decay Puzzles by :
Download or read book Large Charmless Yield in B Decays and Inclusive B Decay Puzzles written by and published by . This book was released on 1996 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent studies of inclusive $B$ decays, it has been suggested that either $B$ mesons decay much more copiously to final states with no open charm than currently assumed, or $B(D0̂ \to K-̂\pi+̂)$ has to be reduced significantly. This note takes the experimental $B(D0̂ \to K-̂\pi+̂)$ at its face value and estimates $B(b\to$ no open charm) using complementary methods: one accounts for the $c$ quark in $b\to c$ transitions, the other accounts for the $\bar c$ quark in $b\to c\bar c s$ transitions. Through cancellation of errors, the average gives our best estimate of $B(b\to$ no open charm), and the difference measures the consistency. The results of the methods are consistent with each other, strongly suggesting a much enhanced $B(b\to$ no open charm). This observation indicates that non-perturbative QCD effects are probably causing a sizable fraction of the $b\to c\bar cs$ transitions to be seen as charmless $b\to s$ processes, contrary to smaller traditional expectations. This mechanism has generally been overlooked and may explain the existing experimental data within the framework of the standard model. We then briefly discuss implications on baryon production governed by $b\to c\bar cs$ processes, rare hadronic $B$ decays and CP violation studies.
Book Synopsis On Exclusive and Inclusive Rare B Decays by :
Download or read book On Exclusive and Inclusive Rare B Decays written by and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report recent results in rare B decays. Our focus will be on b 2!d[gamma] and b 2!sll− transitions. We discuss their impact on the CKM phenomenology and their role within our search for new physics. In particular, we analyze the impact of a recent lattice QCD estimate of the B 2!K* form factor at zero recoil. We also briefly discuss the presently available optimal theoretical tools for the inclusive and exclusive modes.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Model-Independent Analysis of Semileptonic and Radiative Rare B Decays by :
Download or read book Improved Model-Independent Analysis of Semileptonic and Radiative Rare B Decays written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We update the branching ratios for the inclusive decays B 2!X{sub s}ll− and the exclusive decays B 2!(K, K*)ll−, with l = e, [mu], in the standard model by including the explicit [Omicron]([alpha]{sub s}) and [Lambda]{sub QCD}/m{sub b} corrections. This framework is used in conjunction with the current measurements of the branching ratios for B 2!X{sub s{gamma}} and B 2!Kl+l− decays and upper limits on the branching ratios for the decays B 2!(K*, X{sub s})l+l− to work out bounds on the Wilson coefficients C--, C, C9 and C10 appearing in the effective Hamiltonian formalism. The resulting bounds are found to be consistent with the predictions of the standard model and some variants of supersymmetric theories. We illustrate the constraints on supersymmetric parameters that the current data on rare B decays implies in the context of minimal flavour violating model and in more general scenarios admitting additional flavour changing mechanisms. Precise measurements of the dilepton invariant mass distributions in the decays B 2!(X{sub s}, K*, K)l+l−, in particular in the lower dilepton mass region, and the forward-backward asymmetry in the decays B 2!(X{sub s}, K*)l+l−, will greatly help in discriminating among the SM and various supersymmetric theories.
Book Synopsis Enhanced Charmless Yield in B Decays and Inclusive B Decay Puzzles by :
Download or read book Enhanced Charmless Yield in B Decays and Inclusive B Decay Puzzles written by and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Reach of Rare B-Decays written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author discusses the theoretical and empirical status of b 2!s[gamma], b 2!sl l− decays, as well as their future prospects. I emphasize those observables in rare b-decays which can potentially establish new physics and distinguish between extensions of the Standard Model. He briefly reviews current models of electroweak symmetry breaking, all of which can carry interesting flavor characteristics accessible with b-physics experiments.
Book Synopsis Document concernant Raymond Massey, vedette de cinéma by :
Download or read book Document concernant Raymond Massey, vedette de cinéma written by and published by . This book was released on with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Studies of Exclusive Rare B-decays in the Standard Model and Supersymmetric Theories by : Abdelkader S. Safir
Download or read book Theoretical Studies of Exclusive Rare B-decays in the Standard Model and Supersymmetric Theories written by Abdelkader S. Safir and published by . This book was released on 2002 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semileptonic Decays and Sides of the Unitarity Triangle by : I. Stewart
Download or read book Semileptonic Decays and Sides of the Unitarity Triangle written by I. Stewart and published by . This book was released on 2003 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The elements of the CKM matrix enter the expressions for the decay rates and mixing amplitudes of hadrons. In some cases, the theoretical expressions are free of strong interaction effects, for example the CP asymmetry in B {yields} J/{psi} K{sub S}{sup 0}, so that measuring the CP asymmetry directly gives the value of sin 2{beta}, with the error in the result given by the experimental error in the measurement. In most cases, however, the experimentally measured quantities depend on strong interactions physics, and it is absolutely essential to have accurate model-free theoretical calculations to compare with experiment. A number of theoretical tools have been developed over the years which now allow us to compute B decays with great accuracy, sometimes at the level of a few percent or better. These calculations are done using effective theory methods applied to QCD, and do not rely on model assumptions. Inclusive decays can be treated using the operator product expansion (OPE). The total decay rate is given by twice the imaginary part of the forward scattering amplitude, using the optical theorem. In heavy hadron decays, the intermediate states in the forward scattering amplitude can be integrated out, so that the decay rate can be written as an expansion in local operators. The expansion parameter is 1/m{sub B}, the mass of the decaying hadron. OPE techniques have been well-studied in the context of deep-inelastic scattering, where the expansion in powers of 1/Q{sup 2} is called the twist expansion. In inclusive B decays, the leading term in the 1/m{sub B} expansion gives the parton decay rate, and nonperturbative effects enter at higher orders in 1/m{sub B}.
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