Cabibbo suppressed decays and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>Ξ</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>lifetime

Guberina, B.; Štefančić, Hrvoje

doi:10.1103/physrevd.65.114004

Cited by 13 publications

(3 citation statements)

References 22 publications

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“…is in accordance with experiment (for early studies of charmed baryon lifetimes, see [2,5,[74][75][76][77][78][79]). This lifetime hierarchy is understandable qualitatively but not quantitatively.…”

Section: B Lifetimes Of Charmed Baryonssupporting

confidence: 86%

Phenomenological study of heavy hadron lifetimes

Cheng

2018

J. High Energ. Phys.

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The lifetimes of bottom and charmed hadrons are analyzed within the framework of the heavy quark expansion (HQE). Lifetime differences arise from the spectator effects such as weak W -annihilation and Pauli interference. Spectator effects originating from dimension-7 fourquark operators are derived. Hadronic matrix elements of four-quark operators are parameterized in a model-independent way. Using the dimension-6 bag parameters recently determined from HQET sum rules and the vacuum insertion approximation for meson matrix elements of dimension-7 operators, the calculated B meson lifetime ratios τ (B + )/τ (B 0 d ) = 1.074 +0.017 −0.016 and arXiv:1807.00916v3 [hep-ph]

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Section: B Lifetimes Of Charmed Baryonssupporting

confidence: 86%

Phenomenological study of heavy hadron lifetimes

Cheng

2018

J. High Energ. Phys.

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“…Theoretically, the mass spectra, magnetic moments, and radiative and semi-leptonic decays of the doubly charmed baryons has been the center of interest for the last decade . On the contrary, the progress in the heavy-baryon nonleptonic weak decays has been very slow [37][38][39][40][41][42][43][44][45][46], although, the recent experimental observations have revived the activities in nonleptonic decays of heavy baryons in last few years [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61]. Thus, we put our focus on the two-body nonleptonic weak decays of doubly charmed baryons.…”

Section: Introductionmentioning

confidence: 99%

Estimates of W -exchange contributions to Ξcc decays

Sharma

Dhir

2017

Phys. Rev. D

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Encouraged by the recent discovery of the Ξ cc baryon, we investigate two-body nonleptonic weak decays of doubly charmed, Ξ cc , baryons. We calculate the branching ratios for Cabibbo-Kobayashi-Maskawafavored and -suppressed modes in factorization and pole model approaches. The preliminary estimates of nonfactorizable W-exchange contributions are obtained using the pole model. We find that the W-exchange contributions to Ξ cc decays, being sizable, cannot be ignored.

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“…As shown in [21], it is possible to obtain a model-independent prediction of this lifetime once a reliable estimate of the decay rate of inclusive Cabibbo-suppressed decays of c is available. Therefore, a more systematic and detailed approach to the Cabibbo-suppressed decays of singly charmed baryons is called for from both the experimental side, as a way of reducing systematic errors, and the theoretical side, as a way of obtaining model-independent predictions of the c lifetime.…”

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confidence: 99%

Cabibbo-suppressed decays of theΩc0—Feedback to theΞc+lifetime

et al. 2004

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We investigate a possible background of the type 0 c ! c ÿ to the CLEO c lifetime measurement. This decay mode may lead to an overestimate of the c decay length and, therefore, increase the measured c lifetime. The branching ratio ÿ 0 c ! c ÿ =ÿ 0 c ! ÿ is analyzed in the framework of the pole model and the modified current algebra. We find that the 0 c ! c ÿ decay mode could not generate a substantial systematic error in the c lifetime measurement.The lifetime measurements of charmed baryons are well known [1] to be very important in estimating and disentangling the different preasymptotic effects in the decays of charmed hadrons. The preasymptotic effects [2], like the inclusion of soft degrees of freedom (light quarks, gluons) generate nonperturbative power corrections, e.g., the destructive and/or constructive Pauli interference, and the W-exchange contribution, producing the diversity of lifetimes of charmed mesons [3][4][5] and baryons [6,7], which would, otherwise, be all equal in the asymptotic limit of infinitely heavy quark mass 1 .Inclusive hadronic decay rates and lifetimes were calculated a long time ago [3-7] by summing over all possible channels and integrating over some range of energies. A ''practical'' version of the OPE is used in calculations, i.e., it is assumed that the coefficient functions can be found perturbatively and all nonperturbative effects reside in matrix elements. In real world, however, there are nonperturbative effects even at short distances, and the matrix elements are subject to perturbative corrections too.

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Cabibbo suppressed decays and theΞc+lifetime

Cited by 13 publications

References 22 publications

Phenomenological study of heavy hadron lifetimes

Phenomenological study of heavy hadron lifetimes

Estimates of W -exchange contributions to Ξcc decays

Cabibbo-suppressed decays of theΩc0—Feedback to theΞc+lifetime

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