Radiative B-c ->tau(nu)over-tilde(tau)gamma decay

The radiative Bc --> tau<(upsilon)over bar>(tau)gamma decay is analysed in the standard model. The branching ratio of this decay is calculated and the contributions of the bremsstrahlung and structure-dependent parts are compared. It is shown that this decay can be detected at LHC.


QCD sum rule analysis of the rare radiative B(c)-> D(s)*gamma decay
Azizi, K.; Bashiry, V. (American Physical Society (APS), 2007-12-01)
In this work, the radiative B(c)-> D(s)(*)gamma decay is investigated in the framework of QCD sum rules. The transition form factors responsible for the decay are calculated. The total branching ratio for this decay is estimated to be in the order of 10(-5), so this decay can be measurable at LHC in the near future.
Analysis of the rare semileptonic B-c -> P(D, D-s)l(+)l(-)/nu(nu)over-bar decays within QCD sum rules
Azizi, K.; Khosravi, R. (American Physical Society (APS), 2008-08-01)
Considering the gluon condensate corrections, the form factors relevant to the semileptonic rare B-c -> D, D-s(J(P) = 0(-))l(+)l(-) with l = tau, mu, e and B-c -> D, D-s(J(P) = 0(-))nu(nu) over bar transitions are calculated in the framework of the three point QCD sum rules. The heavy quark effective theory limit of the form factors is computed. The branching fraction of these decays is also evaluated and compared with the predictions of the relativistic constituent quark model. Analyzing such transitions c...
Measurement of the mass of the top quark in decays with a J/psi meson in pp collisions 8 Tev
Khachatryan, V.; et. al. (Springer Science and Business Media LLC, 2016-12-01)
A first measurement of the top quark mass in the decay channel t -> (W -> l nu)(b -> J/psi + X -> mu(+) + mu(-) + X) is presented. The analysis uses events selected from the proton-proton collisions recorded by the CMS detector at the LHC at a center-of-mass energy of 8TeV. The data correspond to an integrated luminosity of 19.7 fb(-1), with 666 t (t) over bar and single top quark candidate events containing a reconstructed J/psi candidate decaying into an oppositely-charged muon pair. The mass of the (J/ps...
More about on the short distance contribution to the B-c -> B-u*gamma decay
Alıyev, Tahmasıb; Savcı, Mustafa (Elsevier BV, 2000-05-04)
We calculate the transition form factor for the B-c --> B-u*gamma decay taking into account only the short distance contribution, in framework of QCD sum rules method. We observe that the transition form factor predicted by the QCD sum rules method is approximately two times larger compared to the result predicted by the Isgur, Scora, Grinstein and Wise model.
Semileptonic B-c(-) -> D(*0)l nu transition in three-point QCD sum rules and heavy quark effective theory with gluon condensate corrections
Ghahramany, N.; Khosravi, R.; Azizi, K. (American Physical Society (APS), 2008-12-01)
Taking into account the gluon condensate contributions, the form factors of the semileptonic B-c(-) -> D(*0)l nu transition with l = tau, e are calculated in the framework of the three-point QCD sum rules. The heavy quark effective theory limit of the form factors is also computed. The relevant total decay width as well as the branching ratio are evaluated and compared with the predictions of the other nonperturbative approaches.
Citation Formats
T. Alıyev and M. Savcı, “Radiative B-c ->tau(nu)over-tilde(tau)gamma decay,” JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, pp. 1205–1211, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35182.