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Author: Christian BauerPublisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612538320
Category :
Languages : en
Pages : 117
Book Description
Inclusive Rare B Decays Using Effective Field Theories [microform]
![Inclusive Rare B Decays Using Effective Field Theories [microform] PDF](https://books.google.com/books/content/images/frontcover/4YeGtgAACAAJ?fife=w80-h100)
Author: Christian BauerPublisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612538320
Category :
Languages : en
Pages : 117
Book Description
Inclusive Rare B Decays Using Effective Field Theories
Author: Inclusive Rare B Decays Using Effective Field Theories
Author: Christian BauerPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
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.
Effective Field Theories for Inclusive B Decays
Author: Keith Seng Mun LeePublisher:
ISBN:
Category :
Languages : en
Pages : 442
Book Description
(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.
Present Status of Inclusive Rare B Decays
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
B Decays
Author: Sheldon StonePublisher: World Scientific
ISBN: 9789810213305
Category : Science
Languages : en
Pages : 502
Book Description
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.
Weak Decay Studies from an Effective Theory Standpoint
Author: Aditya Yechan GunjaPublisher:
ISBN:
Category : Field theory (Physics)
Languages : en
Pages : 79
Book Description
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.
B Decays (Revised 2nd Edition)
Author: Sheldon StonePublisher: World Scientific
ISBN: 9814583308
Category : Science
Languages : en
Pages : 673
Book Description
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.
Large Charmless Yield in B Decays and Inclusive B Decay Puzzles
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 21
Book Description
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.
On Exclusive and Inclusive Rare B Decays
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
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.