Top FCNC induced by a Z′ boson

Sungwoong Cho; P. Ko; Jungil Lee; Yuji Omura; Chaehyun Yu

doi:10.1103/PhysRevD.101.055015

Top FCNC induced by a Z′ boson

Sungwoong Cho, P. Ko, Jungil Lee, Yuji Omura, Chaehyun Yu

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We consider a Z′ model in which the Z′ boson couples only to up and top quarks. For a simple setup, one can consider a family-dependent U(1)′ symmetry, under which only right-handed up-type quarks are charged. After symmetry breaking, the right-handed quarks mix with each other, and top flavor-changing neutral currents (FCNCs) mediated by the Z′ boson can be generated at tree level. We take into account several processes at the parton level to probe the top FCNCs and find that the same-sign top quark pair production or the triple top quark production is the most capable of testing the top FCNCs. We also consider a few non-FCNC processes to probe the Z′ boson, for example, dijet production at the LHC. Finally, we perform numerical analysis at detector level and find that the same-sign top quark pair production provides a much more stringent bound on the FCNC coupling than the other processes in most of the parameter space.

Original language	English
Article number	055015
Journal	Physical Review D
Volume	101
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.101.055015
Publication status	Published - 2020 Mar 1

Bibliographical note

Funding Information:
This work is supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), Grants No. NRF-2017R1A2B4011946 (C. Y.), No. NRF-2017R1E1A1A01074699 (J. L.) and No. NRF-2020R1A2C3009918 (S. C.). The work of P. K. is supported in part by KIAS Individual Grant (Grant No. PG021403) at Korea Institute for Advanced Study and by National Research Foundation of Korea (NRF) Grant No. NRF-2019R1A2C3005009, funded by the Korea government (MSIT). The work of C. Y. is also supported in part by a Korea University Grant. The work of Y. O. is supported in part by the Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology in Japan, Grants No. 19H04614, No. 19H05101, and No. 19K03867.

Publisher Copyright:
© 2020 authors.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.101.055015

Cite this

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abstract = "We consider a Z′ model in which the Z′ boson couples only to up and top quarks. For a simple setup, one can consider a family-dependent U(1)′ symmetry, under which only right-handed up-type quarks are charged. After symmetry breaking, the right-handed quarks mix with each other, and top flavor-changing neutral currents (FCNCs) mediated by the Z′ boson can be generated at tree level. We take into account several processes at the parton level to probe the top FCNCs and find that the same-sign top quark pair production or the triple top quark production is the most capable of testing the top FCNCs. We also consider a few non-FCNC processes to probe the Z′ boson, for example, dijet production at the LHC. Finally, we perform numerical analysis at detector level and find that the same-sign top quark pair production provides a much more stringent bound on the FCNC coupling than the other processes in most of the parameter space.",

author = "Sungwoong Cho and P. Ko and Jungil Lee and Yuji Omura and Chaehyun Yu",

note = "Funding Information: This work is supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), Grants No. NRF-2017R1A2B4011946 (C. Y.), No. NRF-2017R1E1A1A01074699 (J. L.) and No. NRF-2020R1A2C3009918 (S. C.). The work of P. K. is supported in part by KIAS Individual Grant (Grant No. PG021403) at Korea Institute for Advanced Study and by National Research Foundation of Korea (NRF) Grant No. NRF-2019R1A2C3005009, funded by the Korea government (MSIT). The work of C. Y. is also supported in part by a Korea University Grant. The work of Y. O. is supported in part by the Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology in Japan, Grants No. 19H04614, No. 19H05101, and No. 19K03867. Publisher Copyright: {\textcopyright} 2020 authors.",

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AU - Lee, Jungil

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N2 - We consider a Z′ model in which the Z′ boson couples only to up and top quarks. For a simple setup, one can consider a family-dependent U(1)′ symmetry, under which only right-handed up-type quarks are charged. After symmetry breaking, the right-handed quarks mix with each other, and top flavor-changing neutral currents (FCNCs) mediated by the Z′ boson can be generated at tree level. We take into account several processes at the parton level to probe the top FCNCs and find that the same-sign top quark pair production or the triple top quark production is the most capable of testing the top FCNCs. We also consider a few non-FCNC processes to probe the Z′ boson, for example, dijet production at the LHC. Finally, we perform numerical analysis at detector level and find that the same-sign top quark pair production provides a much more stringent bound on the FCNC coupling than the other processes in most of the parameter space.

AB - We consider a Z′ model in which the Z′ boson couples only to up and top quarks. For a simple setup, one can consider a family-dependent U(1)′ symmetry, under which only right-handed up-type quarks are charged. After symmetry breaking, the right-handed quarks mix with each other, and top flavor-changing neutral currents (FCNCs) mediated by the Z′ boson can be generated at tree level. We take into account several processes at the parton level to probe the top FCNCs and find that the same-sign top quark pair production or the triple top quark production is the most capable of testing the top FCNCs. We also consider a few non-FCNC processes to probe the Z′ boson, for example, dijet production at the LHC. Finally, we perform numerical analysis at detector level and find that the same-sign top quark pair production provides a much more stringent bound on the FCNC coupling than the other processes in most of the parameter space.

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Top FCNC induced by a Z′ boson

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