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Title: Search for new physics in B{yields}D*{tau}nu-bar {sub {tau}} decay

Abstract

B physics offers important tests of the Standard Model at low energies. Recently, BaBar observed significant deviations from the Standard Model expectations in the semileptonic B{yields}D{sup (*)}{tau}{nu}{sub {tau}} decays. Interestingly, the measured leptonic B{yields}{tau}{nu} branching fraction also deviates from CKM unitarity predictions. Motivated by these results we investigate the most general set of lowest dimensional effective operators leading to modifications of b{yields}c(u) (semi)tauonic transitions. Allowing for general flavor violation, we find that among possible operator structures, new contributions from right-right vector and right-left scalar quark currents provide viable explanations of the anomalies. In addition, we identify a number of B{yields}D*{tau}{nu}{sub {tau}} transition observables with the power to discriminate among the various effective operators' contributions. They are the differential decay rate, longitudinal D* polarization fraction, D*-{tau} opening angle asymmetry and the {tau} helicity asymmetry.

Authors:
; ;  [1];  [2]
  1. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana (Slovenia) and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana (Slovenia)
  2. (Slovenia)
Publication Date:
OSTI Identifier:
22075680
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1492; Journal Issue: 1; Conference: QCD-WORK 2012: International workshop on quantum chromodynamics: Theory and experiment, Lecce (Italy), 18-21 Jun 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B MESONS; BRANCHING RATIO; D*-2010 MESONS; FIELD OPERATORS; FLAVOR MODEL; HELICITY; POLARIZATION; QUARKS; SEMILEPTONIC DECAY; STANDARD MODEL; TAU NEUTRINOS; TAU PARTICLES; UNITARITY

Citation Formats

Fajfer, Svjetlana, Kamenik, Jernej F., Nisandzic, Ivan, and J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana. Search for new physics in B{yields}D*{tau}nu-bar {sub {tau}} decay. United States: N. p., 2012. Web. doi:10.1063/1.4763497.
Fajfer, Svjetlana, Kamenik, Jernej F., Nisandzic, Ivan, & J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana. Search for new physics in B{yields}D*{tau}nu-bar {sub {tau}} decay. United States. doi:10.1063/1.4763497.
Fajfer, Svjetlana, Kamenik, Jernej F., Nisandzic, Ivan, and J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana. Tue . "Search for new physics in B{yields}D*{tau}nu-bar {sub {tau}} decay". United States. doi:10.1063/1.4763497.
@article{osti_22075680,
title = {Search for new physics in B{yields}D*{tau}nu-bar {sub {tau}} decay},
author = {Fajfer, Svjetlana and Kamenik, Jernej F. and Nisandzic, Ivan and J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana},
abstractNote = {B physics offers important tests of the Standard Model at low energies. Recently, BaBar observed significant deviations from the Standard Model expectations in the semileptonic B{yields}D{sup (*)}{tau}{nu}{sub {tau}} decays. Interestingly, the measured leptonic B{yields}{tau}{nu} branching fraction also deviates from CKM unitarity predictions. Motivated by these results we investigate the most general set of lowest dimensional effective operators leading to modifications of b{yields}c(u) (semi)tauonic transitions. Allowing for general flavor violation, we find that among possible operator structures, new contributions from right-right vector and right-left scalar quark currents provide viable explanations of the anomalies. In addition, we identify a number of B{yields}D*{tau}{nu}{sub {tau}} transition observables with the power to discriminate among the various effective operators' contributions. They are the differential decay rate, longitudinal D* polarization fraction, D*-{tau} opening angle asymmetry and the {tau} helicity asymmetry.},
doi = {10.1063/1.4763497},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1492,
place = {United States},
year = {2012},
month = {10}
}