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Title: Tests of the standard model in B D ν , B D * ν and B c J / ψ ν

Abstract

A number of recent experimental measurements suggest the possibility of a breakdown of lepton (ℓ) universality in exclusive b → cℓν semileptonic meson decays. We analyze the full differential decay rates for several such processes, and show how to extract combinations of the underlying helicity amplitudes that are completely independent of m ℓ. Ratios of these combinations for different ℓ (as well as some combinations for a single value of ℓ) therefore equal unity in the standard model and provide stringent tests of lepton universality. Furthermore, the extractions assume the form of weighted integrals over the differential decay rates and therefore are useful even in situations where data in some regions of allowed phase space may be sparse.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1466417
Alternate Identifier(s):
OSTI ID: 1498929
Grant/Contract Number:  
FG02-93ER40762
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Cohen, Thomas D., Lamm, Henry, and Lebed, Richard F. Tests of the standard model in B → D ℓ ν ℓ , B → D * ℓ ν ℓ and B c → J / ψ ℓ ν ℓ. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.034022.
Cohen, Thomas D., Lamm, Henry, & Lebed, Richard F. Tests of the standard model in B → D ℓ ν ℓ , B → D * ℓ ν ℓ and B c → J / ψ ℓ ν ℓ. United States. doi:10.1103/PhysRevD.98.034022.
Cohen, Thomas D., Lamm, Henry, and Lebed, Richard F. Thu . "Tests of the standard model in B → D ℓ ν ℓ , B → D * ℓ ν ℓ and B c → J / ψ ℓ ν ℓ". United States. doi:10.1103/PhysRevD.98.034022.
@article{osti_1466417,
title = {Tests of the standard model in B → D ℓ ν ℓ , B → D * ℓ ν ℓ and B c → J / ψ ℓ ν ℓ},
author = {Cohen, Thomas D. and Lamm, Henry and Lebed, Richard F.},
abstractNote = {A number of recent experimental measurements suggest the possibility of a breakdown of lepton (ℓ) universality in exclusive b → cℓνℓ semileptonic meson decays. We analyze the full differential decay rates for several such processes, and show how to extract combinations of the underlying helicity amplitudes that are completely independent of m ℓ. Ratios of these combinations for different ℓ (as well as some combinations for a single value of ℓ) therefore equal unity in the standard model and provide stringent tests of lepton universality. Furthermore, the extractions assume the form of weighted integrals over the differential decay rates and therefore are useful even in situations where data in some regions of allowed phase space may be sparse.},
doi = {10.1103/PhysRevD.98.034022},
journal = {Physical Review D},
number = 3,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.034022

Citation Metrics:
Cited by: 7 works
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Works referenced in this record:

Optimal-observable analysis of possible new physics in B D ( * ) τ ν τ
journal, February 2016


Lattice QCD calculation of the B ( s ) D ( s ) * ν form factors at zero recoil and implications for | V c b |
journal, March 2018


$|V_{cb}|$ from $\bar{B}^0\rightarrow D^{*+} \ell^- \bar{\nu} $ zero-recoil form factor using 2$+$1$+$1 flavour HISQ and NRQCD
conference, March 2017

  • Harrison, Judd; Davies, Christine; Wingate, Matthew
  • Proceedings of 34th annual International Symposium on Lattice Field Theory — PoS(LATTICE2016)
  • DOI: 10.22323/1.256.0287

Erratum: B D l ν form factors at nonzero recoil and extraction of | V c b | [Phys. Rev. D 92 , 054510 (2015)]
journal, June 2016


Precision corrections to dispersive bounds on form factors
journal, December 1997

  • Boyd, C. Glenn; Grinstein, Benjamín; Lebed, Richard F.
  • Physical Review D, Vol. 56, Issue 11
  • DOI: 10.1103/PhysRevD.56.6895

Measurement of an excess of B ¯ D ( * ) τ ν ¯ τ decays and implications for charged Higgs bosons
journal, October 2013


Measurement of the τ Lepton Polarization and R ( D * ) in the Decay B ¯ D * τ ν ¯ τ
journal, May 2017


$B_c$ decays from highly improved staggered quarks and NRQCD
conference, March 2017

  • Lytle, Andrew; Colquhoun, Brian; Davies, Christine
  • Proceedings of 34th annual International Symposium on Lattice Field Theory — PoS(LATTICE2016)
  • DOI: 10.22323/1.256.0281

Measurement of the form factors of the decay B 0 D * + ν and determination of the CKM matrix element | V c b |
journal, December 2010


Measurement of the Ratio of Branching Fractions B ( B c + J / ψ τ + ν τ ) / B ( B c + J / ψ μ + ν μ )
journal, March 2018


Measurement of the Ratio of Branching Fractions B ( B ¯ 0 D * + τ ν ¯ τ ) / B ( B ¯ 0 D * + μ ν ¯ μ )
journal, September 2015


Analysis of semileptonic decays of mesons containing heavy quarks
journal, January 1990


Review of lattice results concerning low-energy particle physics: Flavour Lattice Averaging Group (FLAG)
journal, February 2017


BD*l v at non-zero recoil
journal, January 2018


Counting of generalized polarizabilities
journal, October 2001


Counting form factors of twist-two operators
journal, March 2001


R(D∗), |Vcb|, and the Heavy Quark Symmetry relations between form factors
journal, November 2017

  • Bigi, Dante; Gambino, Paolo; Schacht, Stefan
  • Journal of High Energy Physics, Vol. 2017, Issue 11
  • DOI: 10.1007/JHEP11(2017)061

Measurement of the ratio of branching fractions $\mathscr{B} (B^0 \to D^{*-} \tau^+ \nu_\tau) / \mathscr{B} (B^0 \to D^{*-} \mu^+ \nu_\mu)$ with hadronic $\tau$ three-prong decays
conference, November 2017

  • Wormser, Guy
  • Proceedings of The 15th International Conference on Flavor Physics & CP Violation — PoS(FPCP2017)
  • DOI: 10.22323/1.304.0006

Update of | V c b | from the B ¯ D * ν ¯ form factor at zero recoil with three-flavor lattice QCD
journal, June 2014


Implications of new physics in the decays B c ( J / ψ , η c ) τ ν
journal, March 2018


Evidence for an Excess of B ¯ D ( * ) τ ν ¯ τ Decays
journal, September 2012


Angular analyses of exclusive B ¯ X 1 2 with complex helicity amplitudes
journal, August 2015


B D l ν form factors at nonzero recoil and extraction of | V c b |
journal, September 2015


Revisiting B D ν
journal, November 2016


Leptonic and semileptonic decays of charm and bottom hadrons
journal, October 1995


Analyzing new physics in the decays B ¯ 0 D ( * ) τ ν ¯ τ with form factors obtained from the covariant quark model
journal, November 2016


Exclusive semileptonic heavy meson decays including lepton mass effects
journal, March 1990

  • Körner, J. G.; Schuler, G. A.
  • Zeitschrift für Physik C: Particles and Fields, Vol. 46, Issue 1
  • DOI: 10.1007/BF02440838

Looking for possible new physics in B D ( * ) τ ν τ in light of recent data
journal, April 2017


B D * τ ν ¯ τ sensitivity to new physics
journal, May 2012


Tau properties in B D τ ν from visible final-state kinematics
journal, May 2017


calculation of BD*l v form factor at zero recoil using the Oktay-Kronfeld action
journal, January 2018


Extraction of |Vcb| from B → D(∗)ℓνℓ and the Standard Model predictions of R(D(∗))
journal, December 2017

  • Jaiswal, Sneha; Nandi, Soumitra; Patra, Sunando Kumar
  • Journal of High Energy Physics, Vol. 2017, Issue 12
  • DOI: 10.1007/JHEP12(2017)060

B D ν form factors at nonzero recoil and | V c b | from 2 + 1 -flavor lattice QCD
journal, August 2015


Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016
journal, December 2017