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

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: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: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: 10.1103/PhysRevD.98.034022

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calculation of B → Dl* v form factor at zero recoil using the Oktay-Kronfeld action
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