The inclusive decay revisited

Krinner, F.; Lenz, Alexander; Rauh, Thomas

doi:10.1016/j.nuclphysb.2013.07.028

Cited by 44 publications

(60 citation statements)

References 117 publications

(203 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…More recent suggestions for quark mass concepts are the kinetic mass from Bigi, Shifman, Uraltsev and Vainshtein [14,15] introduced in 1994, the potential subtracted mass from Beneke [16] and the Υ(1s)-scheme from Hoang, Ligeti and Manohar [17,18], both introduced in 1998. In [19] we compared the above quark mass schemes for inclusive non-leptonic decay rates and found similar numerical results for the different short distance masses. Thus we rely in this review -for simplicity -on predictions based on the MS-mass scheme and we discard the pole mass, even if we give several times predictions based on this mass scheme for comparison.…”

Section: Charm-quark Decaymentioning

confidence: 64%

“…Thus we rely in this review -for simplicity -on predictions based on the MS-mass scheme and we discard the pole mass, even if we give several times predictions based on this mass scheme for comparison. Concerning the concrete numerical values for the quark masses we also take the same numbers as in [19]. In that work relations between different quark mass schemes were strictly used at NLO-QCD accuracy (higher terms were discarded), therefore the num-bers differ slightly from the PDG [1] Since our final lifetime predictions are only known up to NLO accuracy and we expand every expression consistently up to order α s , we will stay with the parameters used in [19].…”

Section: Charm-quark Decaymentioning

confidence: 99%

See 1 more Smart Citation

Lifetimes and heavy quark expansion

Lenz

2015

Int. J. Mod. Phys. A

Self Cite

113

114

View full text Add to dashboard Cite

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

show abstract

Section: Charm-quark Decaymentioning

confidence: 64%

Section: Charm-quark Decaymentioning

confidence: 99%

Lifetimes and heavy quark expansion

Lenz

2015

Int. J. Mod. Phys. A

Self Cite

113

114

View full text Add to dashboard Cite

show abstract

“…a violation of the validity of the HQE, was also considered to solve this discrepancy, in particular in the decay b → ccs. This issue has now been resolved, by more precise data and improved theory predictions (see (Krinner et al, 2013)), leading to a nice agreement between experiment and theory within uncertainties.…”

Section: Heavy Quark Expansionmentioning

confidence: 98%

“…For the inclusive decay b → ccs it was found (see e.g. (Bagan et al, 1995;Krinner et al, 2013;Lenz et al, 1997)) that Q P ≤ 0.05 Q T . Taking this value as an indication for the size ofÃ Peng f /Ã Tree f we get an estimate of r of about |r| ≈ 0.001.…”

Section: A Theorymentioning

confidence: 99%

CP violation in the Bs0 system

2016

Self Cite

View full text Add to dashboard Cite

We review experimental and theoretical studies of CP violation in the B 0 s system. Updated predictions for the mixing parameters of the B 0 s mesons expected in the Standard Model (SM) are given, namely the mass difference ∆M SM s = (18.3±2.7) ps −1 , the decay rate difference ∆Γ SM s = (0.085 ± 0.015) ps −1 , and the flavour specific CP asymmetry a s,SM fs = (2.22 ± 0.27) × 10 −5 and the equivalent quantities in the B 0 -sector. Current experimental values of ∆Ms and ∆Γs agree with remarkable precision with theoretical expectations. This agreement supports the applicability of theoretical tools such as the Heavy Quark Expansion (HQE) to these decays. CP violating studies in the B 0 s system provide essential information to test the SM expectations, and to unveil possible contribution of the new physics (NP). NP effects on ∆Ms of the order of 15% are still possible. The CP phase φs due to CP violation in interference of decays and mixing can accommodate effects of the order of O(100%). The semileptonic CP asymmetry a s sl due to CP violation in mixing could still be a factor of 130 larger than its robust SM expectation and thus provides a very clean observable for NP searches. Theoretical improvements that are necessary to make full use of the experimental precision are discussed.

show abstract

“…For Γ SM tot we take the result from [16] that includes α s -corrections and terms that are subleading in the heavy-quark expansion; the experimental value is taken from [17]: Γ SM tot ¼ ð3.6 AE 0.8Þ · 10 −13 GeV and Γ tot ¼ ð4.20 AE 0.02Þ · 10 −13 GeV. (ii) For the channel b → ccs we take constraints from the branching ratio BðB → X s γÞ into account.…”

Section: New Physics In Tree-level Decaysmentioning

confidence: 99%

New physics effects in tree-level decays and the precision in the determination of the quark mixing angleγ

Brod

Lenz

Tetlalmatzi-Xolocotzi

et al. 2015

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

(2015) 'New physics eects in tree-level decays and the precision in the determination of the quark mixing angle . ', Physical review D., 92 (3). 033002.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevD.92.033002Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review D 92, 033002 c 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe 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. We critically review the assumption that no new physics is acting in tree-level B-meson decays and study the consequences for the ultimate precision in the direct determination of the Cabibbo-KobayashiMaskawa (CKM) angle γ. In our exploratory study we find that sizeable universal new physics contributions, ΔC 1;2 , to the tree-level Wilson coefficients C 1;2 of the effective Hamiltonian describing weak decays of the b quark are currently not excluded by experimental data. In particular, we find that ImΔC 1 and ImΔC 2 can easily be of order AE10% without violating any constraints from data. Such a size of new physics effects in C 1 and C 2 corresponds to an intrinsic uncertainty in the CKM angle γ of the order of jδγj ≈ 4°, which is slightly below the current experimental precision. The accuracy in the determination of γ can be improved by putting stronger constraints on the tree-level Wilson coefficients, in particular C 1 . To this end we suggest a more refined theoretical study as well as more precise measurements of the observables that currently provide the strongest bounds on hypothetical new weak phases in C 1 and C 2 . We note that the semileptonic CP asymmetries seem to have the best prospect for improving the bound on the weak phase in C 1 .

show abstract

The inclusive decay revisited

Cited by 44 publications

References 117 publications

Lifetimes and heavy quark expansion

Lifetimes and heavy quark expansion

CP violation in the Bs0 system

New physics effects in tree-level decays and the precision in the determination of the quark mixing angleγ

Contact Info

Product

Resources

About