Leading logarithmic QCD corrections to the B-s ->gamma gamma decays in the two-Higgs doublet model

Download

index.pdf

Date

1998-03-30

Author

Alıyev, Tahmasıb
Iltan, EO

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

204
views

57
downloads

We calculate the leading logarithmic QCD corrections to the decay B-s --> gamma gamma in the two-Higgs doublet model (2HDM) including O-7-type long-distance effects and estimate the restrictions of the 2HDM parameters, tan beta and m(H), using the experimental data of B --> X-s gamma decay provided by the CLEO Collaboration. A lower bound for the charged Higgs mass m(H) as a function of the renormalization scale mu is given for 2HDM model II. We further present the dependencies of the branching ratio Br(B-s --> gamma gamma) and the ratio \A(+)\(2)/\A(-)\(2) on m(H) and tan beta including leading logarithmic QCD corrections. The dependence on the renormalization scale is found to be strong for both ratios. An additional uncertainty arises from the variation of the parameters of the bound state model, (m(b),<(Lambda)over bar>(s)). We see that to look for charged Higgs effects the measurement of the branching ratio Br(B-s --> gamma gamma) is promising. (C) 1998 Elsevier Science B.V.

Subject Keywords

Two-Higgs doublet model, B-mesons, Quantum chromodynamics, Rare decays, Leading logarithmic corrections, Effective Hamiltonian

URI

https://hdl.handle.net/11511/40973

Journal

NUCLEAR PHYSICS B

DOI

https://doi.org/10.1016/s0550-3213(98)00018-2

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Leading logarithmic QCD corrections to the B-s->gamma gamma decay rate including long-distance effects through B-s->phi gamma->gamma gamma Hiller, G; Iltan, EO (1997-09-18) We present leading logarithmic QCD corrections to the decay B-s --> gamma gamma in the Standard Model. Further, the form factor F-1(0) of B-s --> phi gamma is calculated in the framework of QCD sum rules and found to be in agreement with the result existing in the literature. Using Vector Meson Dominance model, the amplitude for B-s --> phi gamma --> gamma gamma is calculated as an estimate of the O-7-type contributions to the long-distance effects in the B-s --> gamma gamma decay. The resulting branching r...
SENSITIVITY OF THE ASYMMETRY OF THE POLARIZED B-QUARK RADIATIVE B-]S-GAMMA-G DECAY TO THE MODEL FCNC Alıyev, Tahmasıb; PAK, NK; REKALO, MP (1995-01-26) The effects induced by the initial b-quark longitudinal polarization in the rare b-->s gamma g decay in the standard (SM) and two Higgs doublet (2HDM) models are investigated. Using the structure functions formalism we calculate different asymmetries in b-->s gamma g decay in terms of the magnetic dipole type form factors, which describe the b-->s gamma and b-->sg transitions. It is shown that the general expressions for the structure functions are model independent; the model dependent information is conta...
New physics effects to the lepton polarizations in the B -> Kl(+)l(-) decay Alıyev, Tahmasıb; Özpineci, Altuğ; Savcı, Mustafa (2001-09-01) Using the general, model independent form of the effective Hamiltonian, the general expressions of the longitudinal, normal, and transversal polarization asymmetries for l(-) and l(+) and combinations of them for the exclusive B-->Kl(+)l(-) decay are found. The sensitivity of lepton polarizations and their combinations on new Wilson coefficients are studied. It is found that there exist regions of Wilson coefficients for which the branching ratio coincides with the standard model result while the lepton pol...
B-s ->gamma gamma decay in the two Higgs doublet model with flavor changing neutral currents Alıyev, Tahmasıb (1998-11-01) We calculate the leading logarithmic QCD corrections to the decay B-s --> gamma gamma in the two Higgs doublet model with tree level flavor changing currents (modeI III) including O-7 type long distance effects. Further, we analyze the dependences of the branching ratio B(B-s --> gamma gamma) and the ratio of CP-even and CP-odd amplitude squares, R = \A(+)\(2)/\A(-)\(2), on the charged Higgs boson mass m(H+/-) and the selected model III parameters xi(U,D) including the leading logarithmic QCD corrections. I...
Measurements of the pp -> W gamma gamma and pp -> Z gamma gamma cross sections and limits on anomalous quartic gauge couplings at root s=8 TeV Sirunyan, A. M.; et. al. (Springer Science and Business Media LLC, 2017-10-01) Measurements are presented of W gamma gamma and Z gamma gamma production in proton-proton collisions. Fiducial cross sections are reported based on a data sample corresponding to an integrated luminosity of 19.4 fb(-1) collected with the CMS detector at a center-of-mass energy of 8 TeV. Signal is identified through the W -> lv and Z -> ll decay modes, where l is a muon or an electron. The production of W gamma gamma and Z gamma gamma, measured with significances of 2.6 and 5.9 standard deviations, respectiv...

Citation Formats

T. Alıyev and E. Iltan, “Leading logarithmic QCD corrections to the B-s ->gamma gamma decays in the two-Higgs doublet model,” NUCLEAR PHYSICS B, pp. 321–341, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40973.