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Title: $$ {R}_{D^{\left(*\right)}} $$ in custodial warped space

Abstract

Here, flavor physics experiments allow to probe the accuracy of the Standard Model (SM) description at low energies, and are sensitive to new heavy gauge bosons that couple to quarks and leptons in a relevant way. The apparent anomaly in the ratios of the decay of $B$-mesons into $D$-mesons and different lepton flavors, $$R_{D^{(\ast)}} = \mathcal B(B \to D^{(\ast)} \tau \nu)/ \mathcal B(B \to D^{(\ast)} \ell \nu )$$ is particularly intriguing, since these decay processes occur at tree-level in the SM. Recently, it has been suggested that this anomaly may be explained by new gauge bosons coupled to right-handed currents of quarks and leptons, involving light right-handed neutrinos. In this work we present a well-motivated ultraviolet complete realization of this idea, embedding the SM in a warped space with an $$SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$$ bulk gauge symmetry. Besides providing a solution to the hierarchy problem, we show that this model, which has an explicit custodial symmetry, can explain the $$R_{D^{(\ast)}}$$ anomaly and at the same time allow for a solution to the $$R_{K^{(\ast)}}$$ anomalies, related to the decay of $B$-mesons into $K$-mesons and leptons, $$R_{K^{(*)}} = \mathcal B(B\to K^{(*)} \mu \mu)/ \mathcal B(B \to K^{(*)} e e)$$. In addition, a model prediction is an anomalous value of the forward-backward asymmetry $$A^b_{FB}$$, driven by the $$Z\bar b_R b_R$$ coupling, in agreement with LEP data.

Authors:
 [1]; ORCiD logo [2];  [3];  [4]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
  2. Univ. de Granada, Granada (Spain)
  3. Institut de Fisica d'Altes Energies (IFAE) and BIST, Barcelona (Spain); Univ. of Notre Dame, Notre Dame, IN (United States)
  4. Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); Catalan Government
OSTI Identifier:
1487057
Alternate Identifier(s):
OSTI ID: 1593936
Report Number(s):
arXiv:1809.01107; FERMILAB-PUB-18-386-T; EFI-18-9; UAB-FT-777
Journal ID: ISSN 1029-8479; 1692568
Grant/Contract Number:  
SC0009924; AC02-07CH11359; FG02-13ER41958; AC02-06CH11357; FIS2017- 85053-C2-1-P; RYC-2016-20678; CICYT-FEDER-FPA2014-55613-P; FPA2017-88915-P; 2017SGR1069; SEV-2016-0588; PHY-1607611
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 12; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Phenomenology of Field Theories in Higher Dimensions; Phenomenology of Large extra dimensions

Citation Formats

Carena, Marcela, Megías, Eugenio, Quirós, Mariano, and Wagner, Carlos. $ {R}_{D^{\left(*\right)}} $ in custodial warped space. United States: N. p., 2018. Web. doi:10.1007/JHEP12(2018)043.
Carena, Marcela, Megías, Eugenio, Quirós, Mariano, & Wagner, Carlos. $ {R}_{D^{\left(*\right)}} $ in custodial warped space. United States. doi:10.1007/JHEP12(2018)043.
Carena, Marcela, Megías, Eugenio, Quirós, Mariano, and Wagner, Carlos. Fri . "$ {R}_{D^{\left(*\right)}} $ in custodial warped space". United States. doi:10.1007/JHEP12(2018)043. https://www.osti.gov/servlets/purl/1487057.
@article{osti_1487057,
title = {$ {R}_{D^{\left(*\right)}} $ in custodial warped space},
author = {Carena, Marcela and Megías, Eugenio and Quirós, Mariano and Wagner, Carlos},
abstractNote = {Here, flavor physics experiments allow to probe the accuracy of the Standard Model (SM) description at low energies, and are sensitive to new heavy gauge bosons that couple to quarks and leptons in a relevant way. The apparent anomaly in the ratios of the decay of $B$-mesons into $D$-mesons and different lepton flavors, $R_{D^{(\ast)}} = \mathcal B(B \to D^{(\ast)} \tau \nu)/ \mathcal B(B \to D^{(\ast)} \ell \nu )$ is particularly intriguing, since these decay processes occur at tree-level in the SM. Recently, it has been suggested that this anomaly may be explained by new gauge bosons coupled to right-handed currents of quarks and leptons, involving light right-handed neutrinos. In this work we present a well-motivated ultraviolet complete realization of this idea, embedding the SM in a warped space with an $SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$ bulk gauge symmetry. Besides providing a solution to the hierarchy problem, we show that this model, which has an explicit custodial symmetry, can explain the $R_{D^{(\ast)}}$ anomaly and at the same time allow for a solution to the $R_{K^{(\ast)}}$ anomalies, related to the decay of $B$-mesons into $K$-mesons and leptons, $R_{K^{(*)}} = \mathcal B(B\to K^{(*)} \mu \mu)/ \mathcal B(B \to K^{(*)} e e)$. In addition, a model prediction is an anomalous value of the forward-backward asymmetry $A^b_{FB}$, driven by the $Z\bar b_R b_R$ coupling, in agreement with LEP data.},
doi = {10.1007/JHEP12(2018)043},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 12,
volume = 2018,
place = {United States},
year = {2018},
month = {12}
}

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