HIGHER-ORDERS IN SEMILEPTONIC B-DECAYS

2012 ◽  
Vol 27 (32) ◽  
pp. 1230027
Author(s):  
SASCHA TURCZYK
Keyword(s):  
B Mesons ◽  
Charm Quark ◽  
Matrix Elements ◽  
B Decays ◽  
Intrinsic Charm ◽  
Power Corrections ◽  
Potential Impact ◽  
Inclusive Semileptonic Decays ◽  
Semileptonic B Decays

In this paper, on a talk given at Lawrence Berkeley Laboratory, we discuss higher-order non-perturbative corrections in inclusive semileptonic decays of B mesons. First the generic calculation is reviewed and then we identify the relevant hadronic matrix-elements up to [Formula: see text]. For a quantitative analysis of these effects, the value of these new matrix-elements is estimated within an approximation scheme. We investigate the role of so-called "intrinsic-charm" operators in this decay, appearing first at order [Formula: see text] in the heavy-quark expansion. These operators induce an expansion infrared sensitive to the charm quark [Formula: see text]. Parametrically the power corrections complement the estimate of the potential impact of [Formula: see text] contributions, which we will explore. In this context, we draw semiquantitative conclusions for the expected scale of valence weak annihilation contribution in semileptonic B decays. Furthermore the effects on the integrated rate and on kinematic moments are then estimated up to [Formula: see text].

scholarly journals New physics in inclusive semileptonic B decays including nonperturbative corrections

2019 ◽  
Vol 34 (06n07) ◽  
pp. 1950036 ◽  
Author(s):  
Saeed Kamali
Keyword(s):  
New Physics ◽  
Numerical Results ◽  
B Decays ◽  
Power Corrections ◽  
Semileptonic B Decays

In this work, we study the effects of New Physics (NP) operators on the inclusive [Formula: see text] decay including power [Formula: see text] corrections in the NP operators. In analogy with [Formula: see text] observables, we study the observable [Formula: see text]. We present some numerical results for [Formula: see text] and compare the results for this observable with and without power corrections in the NP contributions.

scholarly journals Taming the higher power corrections in semileptonic B decays

2016 ◽  
Vol 763 ◽  
pp. 60-65 ◽  
Author(s):  
Paolo Gambino ◽  
Kristopher J. Healey ◽  
Sascha Turczyk
Keyword(s):  
B Decays ◽  
Power Corrections ◽  
Higher Power ◽  
Semileptonic B Decays

scholarly journals Charm quark mass from inclusive semileptonic B decays

2006 ◽  
Vol 633 (4-5) ◽  
pp. 526-532 ◽  
Author(s):  
André H. Hoang ◽  
Aneesh V. Manohar
Keyword(s):  
Quark Mass ◽  
Charm Quark ◽  
B Decays ◽  
Charm Quark Mass ◽  
Semileptonic B Decays

OBSERVATION OF SEMILEPTONIC B DECAYS INTO ORBITALLY EXCITED D FINAL STATES

2005 ◽  
Vol 20 (16) ◽  
pp. 3660-3663
Author(s):  
◽  
Sudhir Malik
Keyword(s):  
Decay Mode ◽  
B Mesons ◽  
Branching Fraction ◽  
Semileptonic Decays ◽  
Final States ◽  
B Decays ◽  
Semileptonic B Decays

Using 250 pb-1 of data collected with the DØ detector in Run II of the Tevatron, the two narrow (L = 1) states, D1(2420) and [Formula: see text] have been observed in semileptonic decays of B mesons. Results on the D*+ π- decay mode are presented including a measurement of the branching fraction of B mesons to these states.

scholarly journals SEMILEPTONIC B DECAYS AND DETERMINATION OF |Vub|

2005 ◽  
Vol 20 (29) ◽  
pp. 2183-2197
Author(s):  
MASAHIRO MORII
Keyword(s):  
Matrix Element ◽  
B Mesons ◽  
Bottom Quark ◽  
Experimental Studies ◽  
Large Data ◽  
Strong Interactions ◽  
B Decays ◽  
Theoretical Developments ◽  
Semileptonic B Decays

Semileptonic decays of the B mesons provide an excellent probe for the weak and strong interactions of the bottom quark. The large data samples collected at the B Factories have pushed the experimental studies of the semileptonic B decays to a new height and stimulated significant theoretical developments. We review recent progresses in this fast-evolving field, with an emphasis on the determination of the magnitude of the Cabibbo–Kobayashi–Maskawa matrix element |Vub|.

scholarly journals CHARMLESS 3-BODY B DECAYS: RESONANT AND NONRESONANT CONTRIBUTIONS

2008 ◽  
Vol 23 (21) ◽  
pp. 3229-3236 ◽  
Author(s):  
HAI-YANG CHENG
Keyword(s):  
Simple Model ◽  
B Mesons ◽  
Time Dependent ◽  
Matrix Elements ◽  
B Decays ◽  
Factorization Approach ◽  
Large Source ◽  
Model Based ◽  
The Matrix ◽  
Nonresonant Background

Charmless 3-body decays of B mesons are studied using a simple model based on the framework of the factorization approach. We have identified a large source of the nonresonant signal in the matrix elements of scalar densities, e.g. [Formula: see text]. This explains the dominance of the nonresonant background in B → KKK decays, the sizable nonresonant fraction of order (35 ~ 40)% in K−π+π− and [Formula: see text] modes and the smallness of nonresonant rates in B → πππ decays. We have computed the resonant and nonresonant contributions to charmless 3-body decays and determined the rates for the quasi-two-body decays B → VP and B → SP. Time-dependent CP asymmetries sin 2β eff and ACP in K+K−KS, KSKSKS, KSπ+π− and KSπ0π0 modes are estimated.

scholarly journals DETERMINATIONS OF |Vub| AND |Vcb| FROM MEASUREMENTS OF B→ Xu,cℓν DIFFERENTIAL DECAY RATES

1999 ◽  
Vol 14 (18) ◽  
pp. 1163-1173 ◽  
Author(s):  
CHANGHAO JIN
Keyword(s):  
B Mesons ◽  
Light Cone ◽  
Semileptonic Decays ◽  
Decay Rates ◽  
Matrix Elements ◽  
Model Independent ◽  
Inclusive Semileptonic Decays ◽  
Scaling Variables

Methods are described in the framework of light-cone expansion which allow one to determine the Cabibbo–Kobayashi–Maskawa matrix elements |Vub| and |Vcb| from measurements of the differential decay rates as a function of the scaling variables in the inclusive semileptonic decays of B mesons. By these model-independent methods the dominant hadronic uncertainties can be avoided and the B→ Xuℓν decay can be very efficiently differentiated from the B→ Xcℓν decay, which may lead to precise determinations of |Vub| and |Vcb|.

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