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Title: Maximizing the impact of new physics in b 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:
ORCiD logo;
Publication Date:
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.
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
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.
@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 = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1103/PhysRevD.100.115013

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Cited by: 4 works
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