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

Cohen, Thomas D.; Lamm, Henry; Lebed, Richard F.

doi:10.1103/PhysRevD.98.034022

Title: Tests of the standard model in $B \to D ℓ ν_{ℓ}$ , $B \to D^{*} ℓ ν_{ℓ}$ and $B_{c} \to J / ψ ℓ ν_{ℓ}$

Abstract

A number of recent experimental measurements suggest the possibility of a breakdown of lepton (ℓ) universality in exclusive b → cℓν_ℓ 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:: Cohen, Thomas D.; Lamm, Henry; Lebed, Richard F.

Publication Date:: 2018-08-23

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.

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                    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:https://doi.org/10.1103/PhysRevD.98.034022

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                    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:https://doi.org/10.1103/PhysRevD.98.034022.

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@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}

}

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DOI: https://doi.org/10.1103/PhysRevD.98.034022

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Works referencing / citing this record:

Precision model-independent bounds from a global analysis of $b \to c ℓ ν$ form factors
journal, November 2019

Cohen, Thomas D.; Lamm, Henry; Lebed, Richard F.
Physical Review D, Vol. 100, Issue 9
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Footprints of new physics in $b \to c τ ν$ transitions
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Huang, Zhuo-Ran; Li, Ying; Lu, Cai-Dian
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$${b\rightarrow c\tau \nu }$$ b → c τ ν transitions in the standard model effective field theory
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Hu, Quan-Yi; Li, Xin-Qiang; Yang, Ya-Dong
The European Physical Journal C, Vol. 79, Issue 3
DOI: 10.1140/epjc/s10052-019-6766-8

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

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

Update of $| V_{c b} |$ from the $\bar{B} \to D^{*} ℓ \bar{ν}$ form factor at zero recoil with three-flavor lattice QCD
journal, June 2014

Implications of new physics in the decays $B_{c} \to (J / ψ, η_{c}) τ ν$
journal, March 2018

Evidence for an Excess of $\bar{B} \to D^{(*)} τ^{-} {\bar{ν}}_{τ}$ Decays
journal, September 2012

Angular analyses of exclusive $\bar{B} \to X ℓ_{1} ℓ_{2}$ with complex helicity amplitudes
journal, August 2015

$B \to D l ν$ form factors at nonzero recoil and extraction of $| V_{c b} |$
journal, September 2015

Revisiting $B \to D ℓ ν$
journal, November 2016

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

Publisher’s Note: Measurement of the Ratio of Branching Fractions $B ({\bar{B}}^{0} \to D^{* +} τ^{-} {\bar{ν}}_{τ}) / B ({\bar{B}}^{0} \to D^{* +} μ^{-} {\bar{ν}}_{μ})$ [Phys. Rev. Lett. 115 , 111803 (2015)]
journal, October 2015

Analyzing new physics in the decays ${\bar{B}}^{0} \to D^{(*)} τ^{-} {\bar{ν}}_{τ}$ with form factors obtained from the covariant quark model
journal, November 2016

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

Looking for possible new physics in $B \to D^{(*)} τ ν_{τ}$ in light of recent data
journal, April 2017

$B \to D^{*} τ {\bar{ν}}_{τ}$ sensitivity to new physics
journal, May 2012

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

Measurement of the branching ratio of ${\bar{B}}^{0} \to D^{* +} τ^{-} {\bar{ν}}_{τ}$ relative to ${\bar{B}}^{0} \to D^{* +} ℓ^{-} {\bar{ν}}_{ℓ}$ decays with a semileptonic tagging method
journal, October 2016

calculation of B → Dl* 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

$B \to D ℓ ν$ 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

Precision model-independent bounds from a global analysis of $b \to c ℓ ν$ form factors
journal, November 2019

Footprints of new physics in $b \to c τ ν$ transitions
journal, November 2018

$${b\rightarrow c\tau \nu }$$ b → c τ ν transitions in the standard model effective field theory
journal, March 2019