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Title: Searching for axionlike particles in flavor-changing neutral current processes [A new flavor of searches for axion-like particles]

Abstract

Here, we propose new searches for axion-like particles (ALPs) produced in flavor-changing neutral current (FCNC) processes. This proposal exploits the often-overlooked coupling of ALPs to W ± bosons, leading to FCNC production of ALPs even in the absence of a direct coupling to fermions. Our proposed searches for resonant ALP production in decays such as B→K(*)a, a→γγ, and K→πa, a→γγ could greatly improve upon the current sensitivity to ALP couplings to standard model particles. Finally, we also determine analogous constraints and discovery prospects for invisibly decaying ALPs.

Authors:
 [1];  [2];  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1352550
Alternate Identifier(s):
OSTI ID: 1347057; OSTI ID: 1361267
Report Number(s):
SLAC-PUB-16876; BNL-113898-2017-JA
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1700607
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC02-76SF00515; PHY-1316783; AC02-05CH1123
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 11; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HET; axion; flavor; neutral

Citation Formats

Izaguirre, Eder, Lin, Tongyan, and Shuve, Brian. Searching for axionlike particles in flavor-changing neutral current processes [A new flavor of searches for axion-like particles]. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.111802.
Izaguirre, Eder, Lin, Tongyan, & Shuve, Brian. Searching for axionlike particles in flavor-changing neutral current processes [A new flavor of searches for axion-like particles]. United States. doi:10.1103/PhysRevLett.118.111802.
Izaguirre, Eder, Lin, Tongyan, and Shuve, Brian. Wed . "Searching for axionlike particles in flavor-changing neutral current processes [A new flavor of searches for axion-like particles]". United States. doi:10.1103/PhysRevLett.118.111802. https://www.osti.gov/servlets/purl/1352550.
@article{osti_1352550,
title = {Searching for axionlike particles in flavor-changing neutral current processes [A new flavor of searches for axion-like particles]},
author = {Izaguirre, Eder and Lin, Tongyan and Shuve, Brian},
abstractNote = {Here, we propose new searches for axion-like particles (ALPs) produced in flavor-changing neutral current (FCNC) processes. This proposal exploits the often-overlooked coupling of ALPs to W± bosons, leading to FCNC production of ALPs even in the absence of a direct coupling to fermions. Our proposed searches for resonant ALP production in decays such as B→K(*)a, a→γγ, and K→πa, a→γγ could greatly improve upon the current sensitivity to ALP couplings to standard model particles. Finally, we also determine analogous constraints and discovery prospects for invisibly decaying ALPs.},
doi = {10.1103/PhysRevLett.118.111802},
journal = {Physical Review Letters},
number = 11,
volume = 118,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2017},
month = {Wed Mar 15 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 9works
Citation information provided by
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  • Here, we propose new searches for axion-like particles (ALPs) produced in flavor-changing neutral current (FCNC) processes. This proposal exploits the often-overlooked coupling of ALPs to W ± bosons, leading to FCNC production of ALPs even in the absence of a direct coupling to fermions. Our proposed searches for resonant ALP production in decays such as B→K(*)a, a→γγ, and K→πa, a→γγ could greatly improve upon the current sensitivity to ALP couplings to standard model particles. Finally, we also determine analogous constraints and discovery prospects for invisibly decaying ALPs.
  • The anomaly of the top quark forward-backward asymmetry A{sub FB}{sup t} observed at the Tevatron can be explained by the t-channel exchange of a neutral gauge boson (Z{sup '}) which has sizable flavor-changing coupling for top and up quarks. This gauge boson can also induce the top quark flavor-changing neutral-current (FCNC) decays and the like-sign top pair production at the LHC. In this work, we focus on two models which predict such a Z', namely, the left-right model and the U(1){sub X} model, to investigate the correlated effects on A{sub FB}{sup t}, the FCNC decays t{yields}uV (V=g, Z, {gamma}) andmore » the like-sign top pair production at the LHC. We also pay special attention to the most recently measured A{sub FB}{sup t} in the large top pair invariant mass region. We find that under the current experimental constraints both models can alleviate the deviation of A{sub FB}{sup t} and, meanwhile, enhance the like-sign top pair production to the detectable level of the LHC. We also find that the two models give different predictions for the observables and their correlations, and thus they may even be distinguished by jointly studying these top quark observables.« less
  • We examine experimental constraints on scharm-stop flavor mixing in the minimal supersymmetric standard model, which arise from the experimental bounds on squark and Higgs boson masses, the precision measurements of W-boson mass and the effective weak mixing angle, as well as the experimental data on B{sub s}-B{sub s} mixing and b{yields}s{gamma}. We find that the combined analysis can put rather stringent constraints on c-tilde{sub L}-t-tilde{sub L} and c-tilde{sub L}-t-tilde{sub R} mixings. As an illustration for the effects of such constraints, we examine various top-quark flavor-changing neutral-current processes induced by scharm-stop mixings at the LHC and find that their maximal ratesmore » are significantly lowered.« less
  • Many extensions of the standard model (SM) generate contributions to flavor changing neutral current (FCNC) processes that must have sufficient flavor suppression to be consistent with experiments, if the new physics (NP) is associated with a scale of a TeV. Here we present a mechanism for suppressing the NP effects to FCNC processes while allowing for new non-SM CP violating phases. We consider the possibility that the source of NP contributions to FCNC processes share the same flavor symmetry underlying the SM source of FCNC processes which are the quark and lepton mass matrices. We call this the principle ofmore » shared flavor symmetry. In the flavor symmetric limit, the quark and lepton mixing matrices have fixed forms and there are no NP FCNC processes. In the flavor symmetric limit, we take the quark mixing matrix to be the identity matrix and the lepton mixing matrix to be given by tri-bimaximal mixing. Realistic mixing matrices are obtained by the small breaking of the flavor symmetry. New contributions to FCNC processes arise because of nonuniversal breaking of the flavor symmetry in the quark and lepton mass matrices and the NP sources of FCNC processes. In particular, we will focus on new FCNC effects that arise due to the breaking of flavor symmetry only in the quark and charged lepton mass matrices but not in the NP sector. In this scenario, NP contributions to FCNC processes are linked to the source of flavor symmetry breaking in the quark and charged lepton mass matrices. The breaking of flavor symmetry in the NP sector is assumed to produce FCNC effects that are at most the size of NP FCNC effects due to the breaking of flavor symmetry in the quark and charged lepton mass matrices. To demonstrate the mechanism we use a two Higgs doublet model as an example of beyond the SM physics though one should be able to adapt this mechanism to other models of new physics.« less