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Title: Lifetime of B c - Mesons Constrains Explanations for Anomalies in B D ( * ) τ ν

Here, we investigate a new constraint on new-physics interpretations of the anomalies observed in B→D( *)τν decays making use of the lifetime of the B$$-\atop{c}$$ meson. A constraint is obtained by demanding that the rate for B$$-\atop{c}$$→τ -$$-\atop{v}$$ does not exceed the fraction of the total width that is allowed by the calculation of the lifetime in the standard model. This leads to a very strong bound on new-physics scenarios involving scalar operators since they lift the slight, but not negligible, chiral suppression of the B$$-\atop{c}$$→τ -$$-\atop{v}$$ amplitude in the standard model. The new constraint renders a scalar interpretation of the enhancement measured in R D* implausible, including explanations implementing extra Higgs doublets or certain classes of leptoquarks. We also discuss the complementarity of R D(*) and a measurement of the longitudinal polarization of the τ in the B→D *τν decay in light of our findings.
Authors:
 [1] ;  [2] ;  [1]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theoretical Physics Dept.
  2. Univ. of California San Diego, La Jolla, CA (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
sc0009919
Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1344615
Alternate Identifier(s):
OSTI ID: 1423951

Alonso, Rodrigo, Grinstein, Benjamín, and Martin Camalich, Jorge. Lifetime of Bc- Mesons Constrains Explanations for Anomalies in B→D(*)τν. United States: N. p., Web. doi:10.1103/PhysRevLett.118.081802.
Alonso, Rodrigo, Grinstein, Benjamín, & Martin Camalich, Jorge. Lifetime of Bc- Mesons Constrains Explanations for Anomalies in B→D(*)τν. United States. doi:10.1103/PhysRevLett.118.081802.
Alonso, Rodrigo, Grinstein, Benjamín, and Martin Camalich, Jorge. 2017. "Lifetime of Bc- Mesons Constrains Explanations for Anomalies in B→D(*)τν". United States. doi:10.1103/PhysRevLett.118.081802.
@article{osti_1344615,
title = {Lifetime of Bc- Mesons Constrains Explanations for Anomalies in B→D(*)τν},
author = {Alonso, Rodrigo and Grinstein, Benjamín and Martin Camalich, Jorge},
abstractNote = {Here, we investigate a new constraint on new-physics interpretations of the anomalies observed in B→D(*)τν decays making use of the lifetime of the B$-\atop{c}$ meson. A constraint is obtained by demanding that the rate for B$-\atop{c}$→τ-$-\atop{v}$ does not exceed the fraction of the total width that is allowed by the calculation of the lifetime in the standard model. This leads to a very strong bound on new-physics scenarios involving scalar operators since they lift the slight, but not negligible, chiral suppression of the B$-\atop{c}$→τ-$-\atop{v}$ amplitude in the standard model. The new constraint renders a scalar interpretation of the enhancement measured in RD* implausible, including explanations implementing extra Higgs doublets or certain classes of leptoquarks. We also discuss the complementarity of RD(*) and a measurement of the longitudinal polarization of the τ in the B→D*τν decay in light of our findings.},
doi = {10.1103/PhysRevLett.118.081802},
journal = {Physical Review Letters},
number = 8,
volume = 118,
place = {United States},
year = {2017},
month = {2}
}