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Grinstein, Benjamı́n; Lebed, Richard F.

doi:10.1103/physrevd.60.031302

Cited by 78 publications

(195 citation statements)

References 22 publications

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“…Other investigations in that direction were e.g. performed by Grinstein and Lebed in 1997 [63] and 1998 [64] and by Grinstein in 2001 [65,66]. In our opinion the best way of tackling this question is to confront precise HQE-based predictions with precise experimental data.…”

Section: Fourth Term In Eq(232)mentioning

confidence: 99%

Lifetimes and heavy quark expansion

Lenz

2015

Int. J. Mod. Phys. A

109

114

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractKolya Uraltsev was one of the inventors of the Heavy Quark Expansion (HQE), that describes inclusive weak decays of hadrons containing heavy quarks and in particular lifetimes. Besides giving a pedagogic introduction into the subject, we review the development and the current status of the HQE, which just recently passed several non-trivial experimental tests with an unprecedented precision. In view of many new experimental results for lifetimes of heavy hadrons, we also update several theory predictions:06. The theoretical precision is currently strongly limited by the unknown size of the nonperturbative matrix elements of four-quark operators, which could be determined with lattice simulations. * Alexander. Lenz@durham.ac.uk

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Section: Fourth Term In Eq(232)mentioning

confidence: 99%

Lifetimes and heavy quark expansion

Lenz

2015

Int. J. Mod. Phys. A

109

114

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“…A similar idea was recently proposed in the description of the decays B + → D * + s γ and B + → D * + γ [4]. There the transition was assumed to be dominated by the lowest poles (B * and D s or D) and was given in terms of the amplitude for BB mixing and the probability rate for D * → Dγ.…”

Section: Introductionmentioning

confidence: 98%

DeterminingVubfromB+→D
Evans
¹
,
Grinstein
²
,
Nolte
³

1999
Phys. Rev. D
Self Cite
121
6
213
0
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It was recently pointed out that the decays B + → D * + s γ and B + → D * + γ can be used for an extraction of |V ub |. The theory of these decays is poorly understood. It was shown that in a world of almost degenerate b and c-quarks the decay would be computable. The severe difficulties that are encountered in the realistic calculation stem primarily from the very hard photon produced in the two body decay. We point out that in the decays B + → D * + s e + e − and B + → D * + e + e − the photon vertex is soft when the charmed meson is nearly at rest (in the B + rest frame). This allows us to compute with some confidence the decay rate in a restricted but interesting kinematic regime. Given enough data the extraction of V ub with reasonably small uncertainties could proceed through an analysis of these exclusive decays much as is done in the determination of V cb .12.15. Hh, 12.39.Hg, 13.40.Hq, 13.25.Hw

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“…3 For example, a = 1/2 in the 't Hooft model in the case of decays of a heavy meson into light mesons [19,20]. 4 The τ decay data in this context was also used in [22] for a test of duality in nonleptonic B decays.…”

Section: Factorization Forb → D * Xmentioning

confidence: 99%

Testing factorization inB→D(*)Xdecays

et al. 2003

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In QCD the amplitude forB 0 → D ( * )+ π − factorizes in the large N c limit or in the large energy limit Q ≫ Λ QCD where Q = {m b , m c , m b − m c }. Data also suggests factorization in the processes B → D * π + π − π − π 0 and B → D * ωπ − , however by themselves neither large N c nor large Q can account for this. Noting that the condition for large energy release inB 0 → D + π − is enforced by the SV limit, m b ≫ m b − m c ≫ Λ, we propose that the combined large N c and SV limits justify factorization in B → D ( * ) X. This combined limit is tested with the B → D * X inclusive decay spectrum measured by CLEO. We also give exact large N c relations among isospin amplitudes forB → D ( * ) X andB → D ( * )D( * ) X, which can be used to test factorization through exclusive or inclusive measurements. Predictions for the modes B → D ( * ) ππ, B → D ( * ) KK and B → D

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B+→Ds*+γand

Cited by 78 publications

References 22 publications

Lifetimes and heavy quark expansion

Lifetimes and heavy quark expansion

DeterminingVubfromB+→D
Evans
¹
,
Grinstein
²
,
Nolte
³

1999
Phys. Rev. D
Self Cite
121
6
213
0
View full text Add to dashboard Cite

Testing factorization inB→D(*)Xdecays

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B+→Ds*+γand

Cited by 78 publications

References 22 publications

Lifetimes and heavy quark expansion

Lifetimes and heavy quark expansion

DeterminingVubfromB+→DEvans1, Grinstein2, Nolte3 1999Phys. Rev. DSelf Cite12162130View full textAdd to dashboardCite

Testing factorization inB→D(*)Xdecays

Contact Info

Product

Resources

About

DeterminingVubfromB+→D
Evans
¹
,
Grinstein
²
,
Nolte
³

1999
Phys. Rev. D
Self Cite
121
6
213
0
View full text Add to dashboard Cite