Mass effects in weak decays of heavy particles

Cortés, José Luis; Pham, Xuan-Yem; Tounsi, Ahmed

doi:10.1103/physrevd.25.188

Cited by 65 publications

(42 citation statements)

References 20 publications

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“…The g R → 0 limit of Eq. 21 agrees with the known SM result [19,20]. Corrections to the free-quark decay model, of order O(1/m 2 b ) have been calculated in the literature for the SM case [20] and can be added to our results for detailed comparisons with experiment.…”

supporting

confidence: 73%

Bdecays withτleptons in nonuniversal left-right models

Valencia

2013

Phys. Rev. D

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Recent measurements of semileptonic B-meson decays into τ -leptons are somewhat higher than expected in the standard model. Although the deviations are less than 3σ, they suggest the possibility of new physics affecting primarily the τ -lepton. In this paper we examine these results within the context of non-universal left-right models. We find that strong constraints from b → sγ For this explanation to be viable, the mass of the non-universal W ′ would be below 1 TeV, within LHC reach.

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supporting

confidence: 73%

Bdecays withτleptons in nonuniversal left-right models

Valencia

2013

Phys. Rev. D

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“…P ex (x) appears as a correction to the exchange diagram, P int (x) corrects for the massive quark in the interference contributions, whileP int (x) is a correction in the case of negative interference when there are two massive quarks in the loop [3,30,31].…”

Section: Discussionmentioning

confidence: 99%

Inclusive decays and lifetimes of doubly-charmed baryons

1999

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The analysis of singly charmed hadrons has been extended to the case of doubly charmed baryons, Ξ ++ cc , Ξ + cc and Ω + cc . Doubly charmed baryons are described as a system containing a heavy cc-diquark and a light quark, similarly as in a heavy-light meson. This leads to preasymptotic effects in semileptonic and nonleptonic decays which are essentially proportional to the meson wave function. Interplay between preasymptotic effects in semileptonic and/or nonleptonic decay rates leads to very clear predictions for semileptonic branching ratios and lifetimes of doubly charmed baryons.

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“…leading to a total semileptonic branching fraction B ( b -+ [5,13]. If we substitute the measured branching fractions into the right-hand side of Eq.…”

Section: The Semileptonic Branching Fraction Of B Mesonsmentioning

confidence: 99%

Inconclusive inclusive nonleptonicBdecays

1995

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We reconsider the conflict between recent calculations of the semileptonic branching ratio of the B meson and the experimentally measured rate. Such calculations depend crucially on the application of "local duality" in nonleptonic decays, and we discuss the relation of this assumption to the weaker assumptions required to compute the semileptonic decay rate. We suggest that the discrepancy between theory and experiment might be due to the channel with two charm quarks in the final state, either because of a small value for m, or because of a failure of local duality. We examine the experimental consequences of such solutions for the charm multiplicity in B decays.PACS number(s): 13.25. Hw, 12.38.Bx, 12.39.Hg, 13.20.He

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Mass effects in weak decays of heavy particles

Cited by 65 publications

References 20 publications

Bdecays withτleptons in nonuniversal left-right models

Bdecays withτleptons in nonuniversal left-right models

Inclusive decays and lifetimes of doubly-charmed baryons

Inconclusive inclusive nonleptonicBdecays

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