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- Ahmady, M R, et al.
(författare)
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ESTIMATING THE ANNIHILATION DECAY B-s -> rho gamma WITH FACTORIZATION
- 2009
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Ingår i: Modern Physics Letters A. - 0217-7323 .- 1793-6632. ; 24:39, s. 3173-3181
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Tidskriftsartikel (refereegranskat)abstract
- The branching ratio for the rare two-body B-s -> rho gamma decay is calculated using the factorization assumption. This transition is dominated by the annihilation diagrams and, in principle, prone to receiving substantial contributions from new physics. We estimate Br(B-s -> rho gamma) approximate to 1.6 x 10(-9) within the Standard Model and investigate the sensitivity of this decay mode to the effects of two new physics scenarios: vector quark model and supersymmetry. Our results indicate that the shift in branching ratio is at most around 10% with the addition of vector quarks and is negligibly small in the constrained minimal supersymmetric extension of the Standard Model.
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- Guchait, M., et al.
(författare)
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Associated production of a Kaluza-Klein excitation of a gluon with a t(t)over-bar pair at the LHC
- 2008
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 666:4, s. 347-351
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Tidskriftsartikel (refereegranskat)abstract
- In certain model-realizations of the Randall-Sundrum scenario, the Kaluza-Klein (KK) excitations of the gluon, g(KK) have enhanced couplings to right-handed top quarks. In the absence of a ggg(KK) coupling in these models, the single production of a g(KK) from an initial gg state is not possible. The search for other production mechanisms at the LHC. therefore, becomes important. We suggest that the associated production of a g(KK) with a t (t) over bar pair is such a mechanism. Our parton-level study, which neglects detection efficiencies, shows that through this process the LHC can probe KK gluon masses in the range of 2.8-3.0 TeV.
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