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2015

Z'-induced FCNC decays of top, beauty and strange quarks

Fuyuto, Kaori, Hou, Wei-Shu, Kohda, Masaya

Understand

Anomalous b --> s transitions from LHCb data may suggest a new massive gauge boson Z' that couples to the left-handed b --> s current, which in turn implies a coupling to the t --> c current.

In this paper, we study flavor-changing neutral current (FCNC) decays of the top quark induced by a Z' boson, namely t --> c Z', based on a model of the gauged L_mu - L_tau symmetry (the difference between the muon and tauon numbers) with vector-like quarks, which was introduced to explain the anomalous LHCb data.
We illustrate that searching for t --> c Z' via Z' --> mu^+ mu^- with LHC Run 1 data can already probe a parameter region which is unexplored by B physics for the Z' mass around O(10) GeV or more.
We further extend the model to very light Z' with mass below 400 MeV, which is motivated by the muon g-2 anomaly.

Built on

G. Ecker, A. Pich, E. de Rafael, Nucl. Phys. B 291
1987
Earlier work this paper cites.
X.-G. He, G.C. Joshi, H. Lew, R.R. Volkas, Phys. Rev. D 43
1991
Earlier work this paper cites.
S.R. Mishra et al
1991
Earlier work this paper cites.
Y. Grossman and Y. Nir, Phys. Lett. B 398
1997
Earlier work this paper cites.
A. Alavi-Harati et al
2000
Earlier work this paper cites.
S. Baek, N.G. Deshpande, X.-G. He, P. Ko, Phys. Rev. D 64
2001
Earlier work this paper cites.
M. Beneke, T. Feldmann, D. Seidel, Nucl. Phys. B 612
2001
Earlier work this paper cites.
J.R. Batley et al
2004
Earlier work this paper cites.
P. Ball and R. Zwicky, Phys. Rev. D 71
2005
Earlier work this paper cites.
P. Ball and R. Zwicky, Phys. Rev. D 71
2005
Earlier work this paper cites.
A.V. Artamonov et al
2005
Earlier work this paper cites.
A.V. Artamonov et al
Original
2008
Earlier work this paper cites.
F. Jegerlehner and A. Nyffeler, Phys. Rept. 477
Original
2009
Earlier work this paper cites.
A.V. Artamonov et al
Original
2009
Earlier work this paper cites.
The t → u Z ′ t\to uZ^{\prime} decay with a hadronically decaying Z ′ Z^{\prime} was discussed in S. Jung, H. Murayama, A. Pierce, J.D. Wells, Phys. Rev. D 81
Original
2010
Earlier work this paper cites.
For a more careful treatment of light vector boson effects on B s B_{s} mixing, see, e.g. S. Oh and J. Tandean, JHEP 1001
Original
2010
Earlier work this paper cites.
H.J. Hyun et al
Original
2010
Earlier work this paper cites.
J.K. Ahn et al
Original
2010
Earlier work this paper cites.
P.J. Fox, J. Liu, D. Tucker-Smith, N. Weiner, Phys. Rev. D 84
Original
2011
Earlier work this paper cites.
J.R. Batley et al
Original
2011
Earlier work this paper cites.
P. Mertens and C. Smith, JHEP 1108
Original
2011
Earlier work this paper cites.