skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Study of FCNC-mediated rare B{sub s} decays in a single universal extra dimension scenario

Abstract

We study the rare semileptonic and radiative leptonic B{sub s} decays in the universal extra dimension model. In this scenario, with a single extra dimension, there exists only one new parameter beyond those of the standard model, which is the inverse of the compactification radius R. We find that with the additional contributions due to the Kaluza-Klein (KK) modes the branching ratios of the rare B{sub s} decays are enhanced from their corresponding standard model values and the zero point of the forward-backward asymmetries are shifted towards the left.

Authors:
 [1];  [2]
  1. School of Physics, University of Hyderabad, Hyderabad 500 046 (India)
  2. Department of Physics, Punjabi University, Patiala 147 002 (India)
Publication Date:
OSTI Identifier:
21011011
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.75.035008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B S MESONS; BRANCHING RATIO; COMPACTIFICATION; KALUZA-KLEIN THEORY; MANY-DIMENSIONAL CALCULATIONS; RADIATIVE DECAY; SEMILEPTONIC DECAY; STANDARD MODEL

Citation Formats

Mohanta, R., and Giri, A. K. Study of FCNC-mediated rare B{sub s} decays in a single universal extra dimension scenario. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.035008.
Mohanta, R., & Giri, A. K. Study of FCNC-mediated rare B{sub s} decays in a single universal extra dimension scenario. United States. doi:10.1103/PHYSREVD.75.035008.
Mohanta, R., and Giri, A. K. Thu . "Study of FCNC-mediated rare B{sub s} decays in a single universal extra dimension scenario". United States. doi:10.1103/PHYSREVD.75.035008.
@article{osti_21011011,
title = {Study of FCNC-mediated rare B{sub s} decays in a single universal extra dimension scenario},
author = {Mohanta, R. and Giri, A. K.},
abstractNote = {We study the rare semileptonic and radiative leptonic B{sub s} decays in the universal extra dimension model. In this scenario, with a single extra dimension, there exists only one new parameter beyond those of the standard model, which is the inverse of the compactification radius R. We find that with the additional contributions due to the Kaluza-Klein (KK) modes the branching ratios of the rare B{sub s} decays are enhanced from their corresponding standard model values and the zero point of the forward-backward asymmetries are shifted towards the left.},
doi = {10.1103/PHYSREVD.75.035008},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 75,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}
  • We study the flavor changing neutral current B{sub s}{yields}{phi}{gamma}, {phi}{nu}{nu} and {lambda}{sub b}{yields}{lambda}{gamma}, {lambda}{nu}{nu} transitions in the standard model and in a scenario with a single universal extra dimension. In particular, we focus on the present knowledge of the hadronic uncertainties and on possible improvements. We discuss how the measurements of these modes can be used to constrain the new parameter involved in the extra-dimensional scenario, the radius R of the extra dimension, completing the information available from B-factories. The rates of these b{yields}s induced decays are within the reach of new experiments, such as LHCb.
  • We study the branching fractions and the lepton polarization asymmetries of rare B{yields}X{sub s}{tau}{sup +}{tau}{sup -} and B{yields}K{sup (*)}{tau}{sup +}{tau}{sup -} modes within the standard model and in the Appelquist-Cheng-Dobrescu model, which is a New Physics scenario with a single universal extra dimension. In particular, we investigate the sensitivity of the observables to the radius R of the compactified extra dimension, which is the only new parameter in this New Physics model. For the exclusive transitions we study the uncertainties due to the hadronic matrix elements using two set of form factors, finding that in many cases such uncertainties aremore » small. In particular, we show that the {tau}{sup -} polarization asymmetries become free of hadronic uncertainties if Large Energy relations for the form factors, valid for low momentum transfer to the lepton pair, are used. We also consider K* helicity fractions and their sensitivity to the compactification parameter.« less
  • We study the double-lepton polarization asymmetries and single and double-lepton polarization forward-backward asymmetries of the rare b{yields}sl{sup +}l{sup -} mode within the standard model and in the Appelquist-Cheng-Dobrescu model, which is a new physics scenario with a single universal extra dimension. In particular, we examine the sensitivity of the observables to the radius R of the compactified extra dimension, which is the new parameter in this new physics model.
  • I consider the exclusive B{yields}K*{gamma}, B{yields}K*{sub 2}{gamma}, B{sub s}{yields}{phi}{gamma} and B{yields}K{eta}{sup ( Prime )}{gamma} radiative decays in the Standard Model and in a scenario with two universal extra dimensions compactified on a chiral square. Computed branching fractions depend on 1/R, the size of the extra dimensions, so that comparison with available data allows to put bounds on such a parameter. The most stringent bound comes from the mode B*{sup 0}{yields}K*{sup 0}{gamma} and reads: 1/R > 710 GeV.
  • We analyze the exclusive rare B{yields}K{sup (*)}l{sup +}l{sup -}, B{yields}K{sup (*)}{nu}{nu}, and B{yields}K*{gamma} decays in the Applequist-Cheng-Dobrescu model, which is an extension of the standard model in presence of universal extra dimensions. In particular, we consider the case of a single universal extra dimension. We study how spectra, branching fractions and asymmetries depend on the compactification parameter 1/R, and whether the hadronic uncertainty due to the form factors obscures or not such a dependence. We find that, using present data, it is possible in many cases to put a sensible lower bound to 1/R, the most stringent one coming frommore » B{yields}K*{gamma}. We also study how improved experimental data can be used to establish stronger constraints to this model.« less