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Nonperturbative aspects of B meson decays.

Craig Burrell

# Nonperturbative aspects of B meson decays.

## by Craig Burrell

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Published .
Written in English

### About the Edition

Finally, we study two-body exclusive nonleptonic decays of the form B¯ → D(*) L, where L is a light meson (L = pi, K, rho). We consider these decay modes in a theoretical framework, called "QCD factorization", which has attracted much interest in recent years. This framework provides no systematic way to calculate nonperturbative corrections to decay amplitudes. We estimate the parametric size of a class of nonperturbative corrections to these decays by partially summing the amplitudes to all orders in perturbation theory.In this thesis we study a number of decay modes of the B meson. First we discuss the rare inclusive leptonic decay B¯ → Xsℓ+ℓ -, where Xs denotes any hadronic state containing an s-quark. This decay is interesting primarily because it is potentially sensitive to new physics at a higher energy scale. Previous theoretical studies of this decay have calculated the nonperturbative corrections up to O&parl0;L2QCD/ m2b&parr0; ; we calculate the O&parl0;L3QCD/ m3b&parr0; corrections to the lepton invariant mass spectrum, the forward-backward asymmetry, and the hadronic invariant mass spectrum. The values of the nonperturbative parameters entering at this order are unknown, resulting in uncertainties in the Standard Model prediction. We estimate the size of these uncertainties by varying the nonperturbative parameters in a range suggested by dimensional analysis. We study how the uncertainties depend on experimentally motivated phase space cuts.We also discuss the rare inclusive semileptonic decay B¯ → Xuℓnu, where Xu is any hadronic final state resulting from the weak b → u transition. We study the hadronic invariant mass spectrum as a means of measuring the CKM parameter

The Physical Object
Pagination145 leaves.
Number of Pages145
ID Numbers
Open LibraryOL19887416M
ISBN 100612944875
OCLC/WorldCa61300505

our calculation B-meson decay constant and B!p‘n semi-leptonic form factors and will subse-quently report on our ongoing work to determine semi-leptonic form factors for rare decays only occurring at loop-level in the SM. The diagrams discussed in the following are sketched in Fig. 1. 2. The inverse moment of the B -meson distribution is particularly important in treatments of exclusive B -decays using effective field theory and the factorisation formalism; and its value is therefore computed: λB(ζ=2GeV)=(3)GeV.

Measurement of the CP-violating phase ϕ s \phi_s ϕ s and the B s 0 B^0_s B s 0 meson decay width difference with B s 0 → J / ψ ϕ B^0_s \to J/\psi\phi B s 0 → J / ψ ϕ decays .   1. Introduction. In , CP violation of B-meson decay was discovered by two experiments: the Belle experiment 1) at KEK and the Babar experiment 2) at SLAC. It is the first discovery of the CP violation in meson decays other than in neutral K-meson decays 3) and it proved that the CP violation in meson decays can be explained by the theory formulated by Makoto .

We discuss the most important Physics thus far extracted from studies of B meson decays. Measurements of the four CP violating angles accessible in B decay are reviewed as well as direct CP violation. A detailed discussion of the measurements of the CKM elements V_{cb} and V_{ub} from semileptonic decays is given, and the differences between resulting values using inclusive decays . in Inclusive B¯→ X u ℓν¯ Decays Matthias Neubert Theory Division, CERN, CH Gen Switzerland Abstract We present a QCD-based approach to the endpoint region of the lepton spectrum in B¯ → Xu ℓ¯ν decays. We introduce a genuinely nonperturbative form factor, the .

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### Nonperturbative aspects of B meson decays by Craig Burrell Download PDF EPUB FB2

B decays are, probably, the best probe of tong-distance aspects of strong interactions. A field theoretic treatment of inclusive semileptonic B meson decays has been formulated [1].

This treatment not only provides a theoretical justi- fication for the DIS-like parton model [2,3], but also allows a calculation of nonperturbative QCD effects to Author: Changhao Jin, Emmanuel A. Paschos. Nonperturbative aspects of B meson decays Burrell, Craig; Abstract.

In this thesis we study a number of decay modes of the B meson. First we discuss the rare inclusive leptonic decay B̄ → Xsℓ+ℓ - where Xs denotes any hadronic state containing an s-quark.

This decay is interesting primarily because it is potentially sensitive to new Author: Craig Burrel. Nonperturbative Aspects Of B Meson Decays. By C Burrell and M Luke.

Abstract. In this thesis we study a number of decay modes of the B meson. First we discuss the rare inclusive leptonic decay B¯ → Xsℓ+ℓ −, where Author: C Burrell and M Luke. We point also to the papers, wherein some aspects of B c decays and spectroscopy were studied: non-leptonic decays in [32], polarization effects in the radiative leptonic decays [33], relativistic.

Nonperturbative aspects of B meson decays Craig Burrell Doctor of Philosophy Graduate Department of Physics University of Toronto In this thesis we study a number of decay modes of the B meson. First we discuss the rare inclusive leptonic decay B —> Xstrt~, where Xs denotes any hadronic state containing an : Craig Burrel.

Journals & Books; Help Download full Vol Issue 1,Pages QCD aspects of exclusive B meson decays I review recent progress on understanding QCD dynamics involved in exclusive B meson decays.

Different frameworks, including light-cone sum rules, QCD factorization, perturbative QCD, softcollinear effective theory, light. The predicted ratios relative to B(B!Dm nm) are identical within the quoted precision.

B meson production and detection B meson decays have been studied at pp and e+e colliding beam facilities, operating at very different beam energies.

The e+ colliders operated at a ﬁxed energy of GeV in the years to The soft function is a universal process-independent function, which describes the distribution of the b quark in the B meson.

Its behavior in the end-point region is governed by the nonperturbative asymptotics of a Wilson line expectation value.

ELSEVIER Nuclear Physics B (Proc. Suppl.) () PQCD approach to exclusive B meson decays Hsiang-nan Lia b* aInstitute of Physics, Academia Sinica, Taipei, TaiwanROC bDepartment of Physics, National Cheng-Kung University, Tainan, TaiwanROC I review the perturbative QCD approach to exclusive B meson decays, concentrating on the proof of the.

help to further study the perturbative and/or nonperturbative QCD dynamics involved in these considered decay modes.

Keywords: B meson decays, branching ratios, CP violations, perturbative QCD approach, standard model In the conventional quark model, a meson is composed of one quark and one antiquark, i.e.

B-Meson Decay. Joaquim Matias. Physics / Experiment Review / Vol. 3, No. Joaquim Matias is a professor of theoretical physics at the Universitat Autònoma de Barcelona and researcher at the Institut de Física d’Altes Energies.

Article Experiment Review Topic Physics Issue Volume 3, Issue 3 November Share Facebook Twitter. A dvances in science, and particularly in physics, have. 1 December PHYSICS LETTERS B ELSEVIER Physics Letters B () 9& Infrared factorization in inclusive B meson decays Gregory P.

Korchemsky 1, George Sterman Institute for Theoretical Physics, State University of New York at Stony Brook, Stony Brook, NYUSA Received 27 July Editor.

JHEP04() Published for SISSA by Springer Received: Febru Accepted: Ma Published: April 3, QCD calculations of radiative heavy meson decays with. the A* baryon and the B meson, in the limit of a very heavy b quark, in lowest order of perturbative QCD.

as nonperturbative aspects of QCD are concernedL3]. The physics of a semileptonic such as occur in exclusive decays like B -+ Dlfi. The emphasis in this paper, however, is to apply these techniques to inclusive decay processes. angle φ1 can be extracted from the CP asymmetry in the B→ J/ψKS decays [3], which arises from the B-B¯ mixing.

Through similar mechanism, the B0 d → π+π− decays are appropriate for the extraction of the angle φ2 (or α). However, these modes contain both tree and penguin contributions, such that the extraction suﬀers uncertainty. A ﬁeld theoretic description for inclusive semileptonic B meson decays is formu-lated.

We argue that large regions of the phase spaces for the decays are dominated by distances near the light cone. The light-cone dominance allows to incorporate nonperturbative QCD eﬀects in a distribution function. A one-to-one correspon.

We find that nonperturbative effects are dominant over a finite region in the lepton energy spectrum, the width of which is related to the kinetic energy of the b quark inside the B meson.

We present a preliminary measurement of the composition of inclusive semileptonic B meson decays using fb^{-1} of e^+e^- data taken with the CLEO detector at the Upsilon(4S) resonance. As a nonperturbative method, the QCD sum rules is a well established technique in the hadron physics since it is based on the fundamental QCD Lagrangian.

The semileptonic decays of to the light mesons involving, and have been studied via the three-point QCD sum rules (3PSR), for instance. The meson, whose inclusive decay is the subject of the present study, is a tensor bound state with quantum numbers.

This meson specially attracts the interest of experimentalists for testing the predictions of perturbative QCD in the laboratory [2–4]. The first observation of was reported in B-decay at CLEO experiment in.

They also provide valuable insight in quark dynamics in the nonperturbative domain of QCD. So a considerable amount of work has been carried out in the semileptonic decays of ground-state B and B.The B-meson distribution amplitude is calculated using QCD sum rules.

In particular we obtain an estimate for the integral relevant to exclusive B-decays \lambda_B = \pm MeV at the scale 1 GeV. A simple QCD-motivated parametrization of the distribution amplitude is suggested.The contributions of the resonant state K * 0 () in the hadronic three-body B meson decays involving S-wave Kπ pair have been ignored in the relevant theoretical studies and be noticed only.