Search for tZ′ associated production induced by tcZ′ couplings at the LHC

Search for tZ′ associated production induced by tcZ′ couplings at the LHC The P5′ and RK anomalies, recently observed by the LHCb Collaboration in B→K(*) transitions, may indicate the existence of a new Z′ boson, which may arise from gauged Lμ-Lτ symmetry. Flavor-changing neutral current Z′ couplings, such as tcZ′, can be induced by the presence of extra vector-like quarks. In this paper we study the LHC signatures of the induced right-handed tcZ′ coupling that is inspired by, but not directly linked to, the B→K(*) anomalies. The specific processes studied are cg→tZ′ and its conjugate process, each followed by Z′→μ+μ-. By constructing an effective theory for the tcZ′ coupling, we first explore in a model-independent way the discovery potential of such a Z′ at the 14 TeV LHC with 300 and 3000  fb-1 integrated luminosities. We then reinterpret the model-independent results within the gauged Lμ-Lτ model. In connection with tcZ′, the model also implies the existence of a flavor-conserving ccZ′ coupling, which can drive the cc¯→Z′→μ+μ- process. Our study shows that existing LHC results for dimuon resonance searches already constrain the ccZ′ coupling, and that the Z′ can be discovered in either or both of the cg→tZ′ and cc¯→Z′ processes. We further discuss the sensitivity to the left-handed tcZ′ coupling and find that the coupling values favored by the B→K(*) anomalies lie slightly below the LHC discovery reach even with 3000  fb-1. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Search for tZ′ associated production induced by tcZ′ couplings at the LHC

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Search for tZ′ associated production induced by tcZ′ couplings at the LHC

Abstract

The P5′ and RK anomalies, recently observed by the LHCb Collaboration in B→K(*) transitions, may indicate the existence of a new Z′ boson, which may arise from gauged Lμ-Lτ symmetry. Flavor-changing neutral current Z′ couplings, such as tcZ′, can be induced by the presence of extra vector-like quarks. In this paper we study the LHC signatures of the induced right-handed tcZ′ coupling that is inspired by, but not directly linked to, the B→K(*) anomalies. The specific processes studied are cg→tZ′ and its conjugate process, each followed by Z′→μ+μ-. By constructing an effective theory for the tcZ′ coupling, we first explore in a model-independent way the discovery potential of such a Z′ at the 14 TeV LHC with 300 and 3000  fb-1 integrated luminosities. We then reinterpret the model-independent results within the gauged Lμ-Lτ model. In connection with tcZ′, the model also implies the existence of a flavor-conserving ccZ′ coupling, which can drive the cc¯→Z′→μ+μ- process. Our study shows that existing LHC results for dimuon resonance searches already constrain the ccZ′ coupling, and that the Z′ can be discovered in either or both of the cg→tZ′ and cc¯→Z′ processes. We further discuss the sensitivity to the left-handed tcZ′ coupling and find that the coupling values favored by the B→K(*) anomalies lie slightly below the LHC discovery reach even with 3000  fb-1.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.015037
Publisher site
See Article on Publisher Site

Abstract

The P5′ and RK anomalies, recently observed by the LHCb Collaboration in B→K(*) transitions, may indicate the existence of a new Z′ boson, which may arise from gauged Lμ-Lτ symmetry. Flavor-changing neutral current Z′ couplings, such as tcZ′, can be induced by the presence of extra vector-like quarks. In this paper we study the LHC signatures of the induced right-handed tcZ′ coupling that is inspired by, but not directly linked to, the B→K(*) anomalies. The specific processes studied are cg→tZ′ and its conjugate process, each followed by Z′→μ+μ-. By constructing an effective theory for the tcZ′ coupling, we first explore in a model-independent way the discovery potential of such a Z′ at the 14 TeV LHC with 300 and 3000  fb-1 integrated luminosities. We then reinterpret the model-independent results within the gauged Lμ-Lτ model. In connection with tcZ′, the model also implies the existence of a flavor-conserving ccZ′ coupling, which can drive the cc¯→Z′→μ+μ- process. Our study shows that existing LHC results for dimuon resonance searches already constrain the ccZ′ coupling, and that the Z′ can be discovered in either or both of the cg→tZ′ and cc¯→Z′ processes. We further discuss the sensitivity to the left-handed tcZ′ coupling and find that the coupling values favored by the B→K(*) anomalies lie slightly below the LHC discovery reach even with 3000  fb-1.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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