Maximizing the impact of new physics in b → c τ ν anomalies

Asadi, Pouya; Shih, David

doi:10.1103/PhysRevD.100.115013

Title: Maximizing the impact of new physics in $b \to c τ ν$ anomalies

Abstract

Here, we develop a rigorous, semianalytical method for maximizing any $$\mathcal{b → cτν}$$ observable in the full 20-real-dimensional parameter space of the dimension 6 effective Hamiltonian, given some fixed values of $$R_{D^{(*)}}$$. We apply our method to find the maximum allowed values of $$F^L_{D^\ast}$$ and $$R_{J/ψ}$$, two observables which have both come out higher than their Standard Model predictions in recent measurements by the Belle and LHCb Collaborations. While the measurements still have large error bars, they add to the existing $$R_{D^{(*)}}$$ anomaly, and it is worthwhile to consider new physics explanations. It has been shown that none of the existing, minimal models in the literature can explain the observed values of $$F^L_{D^\ast}$$ and $$R_{J/ψ}$$. Using our method, we will generalize beyond the minimal models and show that there is no combination of dimension 6 Wilson operators that can come within 1σ of the observed $$R_{J/ψ}$$ value. By contrast, we will show that the observed value of $$F^L_{D\ast}$$ can be achieved, but only with sizable contributions from tensor and mixed-chirality vector Wilson coefficients.

Authors:

; Shih, David

Publication Date:: Fri Dec 06 00:00:00 EST 2019

Research Org.:: Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1577394

Alternate Identifier(s):: OSTI ID: 1802020

Grant/Contract Number:: DOE-SC0010008; SC0010008

Resource Type:: Published Article

Journal Name:: Physical Review D

Additional Journal Information:: Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 11; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy & Astrophysics; Physics

Citation Formats


                    Asadi, Pouya, and Shih, David. Maximizing the impact of new physics in b → c τ ν anomalies.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevD.100.115013.

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                    Asadi, Pouya, & Shih, David. Maximizing the impact of new physics in b → c τ ν anomalies.  United States.  https://doi.org/10.1103/PhysRevD.100.115013

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                    Asadi, Pouya, and Shih, David. Fri .  
"Maximizing the impact of new physics in b → c τ ν anomalies".  United States.  https://doi.org/10.1103/PhysRevD.100.115013.

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@article{osti_1577394,

  title        = {Maximizing the impact of new physics in b → c τ ν anomalies},

  author       = {Asadi, Pouya and Shih, David},

  abstractNote = {Here, we develop a rigorous, semianalytical method for maximizing any $\mathcal{b → cτν}$ observable in the full 20-real-dimensional parameter space of the dimension 6 effective Hamiltonian, given some fixed values of $R_{D^{(*)}}$. We apply our method to find the maximum allowed values of $F^L_{D^\ast}$ and $R_{J/ψ}$, two observables which have both come out higher than their Standard Model predictions in recent measurements by the Belle and LHCb Collaborations. While the measurements still have large error bars, they add to the existing $R_{D^{(*)}}$ anomaly, and it is worthwhile to consider new physics explanations. It has been shown that none of the existing, minimal models in the literature can explain the observed values of $F^L_{D^\ast}$ and $R_{J/ψ}$. Using our method, we will generalize beyond the minimal models and show that there is no combination of dimension 6 Wilson operators that can come within 1σ of the observed $R_{J/ψ}$ value. By contrast, we will show that the observed value of $F^L_{D\ast}$ can be achieved, but only with sizable contributions from tensor and mixed-chirality vector Wilson coefficients.},

  doi          = {10.1103/PhysRevD.100.115013},

  journal      = {Physical Review D},

  number       = 11,

  volume       = 100,

  place        = {United States},

  year         = {Fri Dec 06 00:00:00 EST 2019},

  month        = {Fri Dec 06 00:00:00 EST 2019}

}

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Title: Maximizing the impact of new physics in b → c τ ν anomalies

Abstract

Citation Formats

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Observation of B + → D ¯ * 0 τ + ν τ and evidence for B + → D ¯ 0 τ + ν τ at Belle journal, October 2010

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

Combined analysis of semileptonic B decays to D and D * : R ( D ( * ) ) , | V c b | , and new physics journal, June 2017

Signatures of a nonstandard Higgs boson from flavor physics journal, September 2015

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

Charged Higgs effects on exclusive semi-tauonicB decays journal, June 1995

Resolution of R/ R D ⁎ puzzle journal, September 2018

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

Refining New-Physics Searches in B → D τ ν with Lattice QCD journal, August 2012

Scalar contributions to b→c(u)τν transitions journal, August 2017

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

On lepton flavour universality in semileptonic Bc → ηc, J/ψ decays journal, May 2019

D* polarization vs. RD∗$$ {R}_{D^{\left(\ast \right)}} $$ anomalies in the leptoquark models journal, February 2019

Global fit to b → cτν transitions journal, September 2019

D * polarization as a probe to discriminate new physics in B ¯ → D * τ ν ¯ journal, June 2017

Lepton universality violation with lepton flavor conservation in B-meson decays journal, October 2015

New physics effect on B c → J / ψ τ ν ¯ in relation to the R D ( ⁎ ) anomaly journal, January 2018

Publisher’s Note: Measurement of the Ratio of Branching Fractions B ( B ¯ 0 → D * + τ − ν ¯ τ ) / B ( B ¯ 0 → D * + μ − ν ¯ μ ) [Phys. Rev. Lett. 115 , 111803 (2015)] journal, October 2015

Model-independent bounds on R(J/ψ) journal, September 2018

Probing new physics in B ¯ 0 → D ( * ) τ − ν ¯ τ using the longitudinal, transverse, and normal polarization components of the tau lepton journal, February 2017

Constraint on the branching ratio of B c − → τ ν ¯ from LEP1 data and consequences for R ( D ( * ) ) anomaly journal, October 2017

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

Asymmetry observables and the origin of R D ( * ) anomalies journal, February 2019

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

B → 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

Title: Maximizing the impact of new physics in $b \to c τ ν$ anomalies

Constraints on the charged scalar effects using the forward-backward asymmetry on $\bar{B} \to D^{(*)} τ {\bar{ν}}_{τ}$
journal, March 2013

Impact of polarization observables and $B_{c} \to τ ν$ on new physics explanations of the $b \to c τ ν$ anomaly
journal, April 2019

Mono- $τ$ Signatures at the LHC Constrain Explanations of $B$ -decay Anomalies
journal, April 2019

$B \to D τ ν$ branching ratios: Opportunity for lattice QCD and hadron colliders
journal, July 2008

Lifetime of $B_{c}^{-}$ Mesons Constrains Explanations for Anomalies in $B \to D^{(*)} τ ν$
journal, February 2017

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

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

Measurement of the branching ratio of $\bar{B} \to D^{()} τ^{-} {\bar{ν}}_{τ}$ relative to $\bar{B} \to D^{()} ℓ^{-} {\bar{ν}}_{ℓ}$ decays with hadronic tagging at Belle
journal, October 2015

Measurement of the Ratio of Branching Fractions $B (B_{c}^{+} \to J / ψ τ^{+} ν_{τ}) / B (B_{c}^{+} \to J / ψ μ^{+} ν_{μ})$
journal, March 2018

Revisiting the one leptoquark solution to the R(D (∗)) anomalies and its phenomenological implications
journal, August 2016

The full $ B\to {D^{*}}{\tau^{-}}{{\overline{v}}_{\tau }} $ angular distribution and CP violating triple products
journal, September 2013

Semileptonic decays B _c → (η _c , J/Ψ)lν in the perturbative QCD approach
journal, September 2013

Diagnosing new physics in $b \to c τ ν_{τ}$ decays in the light of the recent BABAR result
journal, August 2012

$$b \rightarrow c \tau \nu _{\tau }$$ b → c τ ν τ Decays: a catalogue to compare, constrain, and correlate new physics effects
journal, March 2019

Erratum: Combined analysis of semileptonic $B$ decays to $D$ and $D^{}$ : $R (D^{()})$ , $| V_{c b} |$ , and new physics [Phys. Rev. D 95 , 115008 (2017)]
journal, March 2018

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

Exclusive decays $B \to ℓ^{-} \bar{ν}$ and $B \to D^{(*)} ℓ^{-} \bar{ν}$ in the covariant quark model
journal, December 2015

Anatomy of b → c τ ν anomalies
journal, November 2018

Tau longitudinal polarization in $\bar{B} \to D τ \bar{ν}$ and its role in the search for the charged Higgs boson
journal, August 2010

Observation of the Semileptonic Decays $B \to D^{*} τ^{-} {\bar{ν}}_{τ}$ and Evidence for $B \to D τ^{-} {\bar{ν}}_{τ}$
journal, January 2008

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

$B_{c} \to (J / Ψ, η_{c}) τ ν$ semileptonic decays within the standard model and beyond
journal, October 2017

New physics in the kinematic distributions of $\bar{B} \to D^{(*)} τ^{-} (\to ℓ^{-} {\bar{ν}}_{ℓ} ν_{τ}) {\bar{ν}}_{τ}$
journal, November 2016

A closer look at the R D and R D* anomalies
journal, January 2017

Closing the window on single leptoquark solutions to the B-physics anomalies
journal, October 2018

Angular distributions of $\overline{B} \to D^{(⁎)} ℓ {\overline{ν}}_{ℓ}$ decays and search of New Physics
journal, September 2019

Observation of $B^{+} \to {\bar{D}}^{* 0} τ^{+} ν_{τ}$ and evidence for $B^{+} \to {\bar{D}}^{0} τ^{+} ν_{τ}$ at Belle
journal, October 2010

Measurement of an excess of $\bar{B} \to D^{(*)} τ^{-} {\bar{ν}}_{τ}$ decays and implications for charged Higgs bosons
journal, October 2013

Combined analysis of semileptonic $B$ decays to $D$ and $D^{}$ : $R (D^{()})$ , $| V_{c b} |$ , and new physics
journal, June 2017

Signatures of a nonstandard Higgs boson from flavor physics
journal, September 2015

Measurement of the Ratio of Branching Fractions $B ({\bar{B}}^{0} \to D^{* +} τ^{-} {\bar{ν}}_{τ}) / B ({\bar{B}}^{0} \to D^{* +} μ^{-} {\bar{ν}}_{μ})$
journal, September 2015

Charged Higgs effects on exclusive semi-tauonicB decays
journal, June 1995

Resolution of R/ $R_{D^{⁎}}$ puzzle
journal, September 2018

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

Refining New-Physics Searches in $B \to D τ ν$ with Lattice QCD
journal, August 2012

Scalar contributions to b→c(u)τν transitions
journal, August 2017

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

On lepton flavour universality in semileptonic Bc → ηc, J/ψ decays
journal, May 2019

D* polarization vs. RD∗$$ {R}_{D^{\left(\ast \right)}} $$ anomalies in the leptoquark models
journal, February 2019

Global fit to b → cτν transitions
journal, September 2019

$D^{}$ polarization as a probe to discriminate new physics in $\bar{B} \to D^{} τ \bar{ν}$
journal, June 2017

Lepton universality violation with lepton flavor conservation in B-meson decays
journal, October 2015

New physics effect on $B_{c} \to J / ψ τ \bar{ν}$ in relation to the $R_{D^{(⁎)}}$ anomaly
journal, January 2018

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

Model-independent bounds on R(J/ψ)
journal, September 2018

Probing new physics in ${\bar{B}}^{0} \to D^{(*)} τ^{-} {\bar{ν}}_{τ}$ using the longitudinal, transverse, and normal polarization components of the tau lepton
journal, February 2017

Constraint on the branching ratio of $B_{c}^{-} \to τ \bar{ν}$ from LEP1 data and consequences for $R (D^{(*)})$ anomaly
journal, October 2017

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

Asymmetry observables and the origin of $R_{D^{(*)}}$ anomalies
journal, February 2019

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