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Title: Suppressing supersymmetric flavor violations through quenched gaugino-flavor interactions

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 11; Related Information: CHORUS Timestamp: 2017-06-28 22:10:52; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Wells, James D., and Zhao, Yue. Suppressing supersymmetric flavor violations through quenched gaugino-flavor interactions. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.115033.
Wells, James D., & Zhao, Yue. Suppressing supersymmetric flavor violations through quenched gaugino-flavor interactions. United States. doi:10.1103/PhysRevD.95.115033.
Wells, James D., and Zhao, Yue. 2017. "Suppressing supersymmetric flavor violations through quenched gaugino-flavor interactions". United States. doi:10.1103/PhysRevD.95.115033.
title = {Suppressing supersymmetric flavor violations through quenched gaugino-flavor interactions},
author = {Wells, James D. and Zhao, Yue},
abstractNote = {},
doi = {10.1103/PhysRevD.95.115033},
journal = {Physical Review D},
number = 11,
volume = 95,
place = {United States},
year = 2017,
month = 6

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 28, 2018
Publisher's Accepted Manuscript

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  • It is shown that the flavor-changing neutral current interaction of leptoquark exchange can be strongly suppressed by a global family symmetry without a numerical fine-tuning of the parameters. In the symmetry limit, if n{times}n degenerate leptoquarks couple universally to n generations of quarks and leptons in the weak basis, not only is the neutral current interaction flavor diagonal, but also the charged current interaction takes exactly the same form as W exchange at low energies. Neutrino reactions and atomic parity violation still impose tight constraints. A quantitative analysis is made on the stability of flavor diagonalization and family independence againstmore » symmetry breaking due to the Higgs-Yukawa coupling. The mechanism is robust against symmetry breaking in the environment of the standard model. {copyright} {ital 1997} {ital The American Physical Society}« less
  • In extensions of the standard model with particle content given by the 27 representation of E/sub 6/, flavor-changing interactions generally exist. We examine such interactions in a supersymmetric left-right model distinguished by its unconventional particle assignments. With the help of a discrete symmetry, we are able to get rid of all direct flavor-changing quark couplings to neutral particles as well as lepton couplings in the sector. We discuss various phenomenological consequences, especially those involving the tau lepton and its neutrino.
  • Recently BABAR and Belle Collaborations have measured direct CP asymmetry A{sub CP}=-0.114{+-}0.020 in B{sup 0}{yields}K{sup -}{pi}{sup +}. The experimental value is substantially different from the QCD factorization prediction. We show that supersymmetry flavor changing neutral current interaction via gluonic dipole can explain the difference. CP asymmetries in other B{yields}K{pi} decays are predicted to be sizable. Taking this asymmetry as a constraint, we find that the allowed supersymmetry parameter space is considerably reduced compared with constraint from B{yields}X{sub s}{gamma} alone. We also find the allowed time-dependent CP asymmetries S{sub f} in B{sup 0}{yields}K*{sup 0}{gamma}{yields}{pi}{sup 0}K{sub S}{gamma} and B{sup 0}{yields}{phi}K{sub S} tomore » be large. These predictions are quite different than those predicted in the standard model and can be tested in the near future.« less
  • Treating the MSSM as an effective theory below a threshold scale {lambda}, we study the consequences of having dimension-five operators in the superpotential for flavor and CP-violating processes. Below the supersymmetric threshold such terms generate flavor changing and/or CP-odd effective operators of dimension six composed from the standard model fermions, that have the interesting property of decoupling linearly with the threshold scale, i.e. as 1/({lambda}m{sub soft}), where m{sub soft} is the scale of soft supersymmetry breaking. The assumption of weak-scale supersymmetry, together with the stringent limits on electric dipole moments and lepton flavor-violating processes, then provides sensitivity to {lambda} asmore » high as 10{sup 7}-10{sup 9} GeV. We discuss the varying sensitivity to these scales within several MSSM benchmark scenarios and also outline the classes of UV physics which could generate these operators.« less
  • Consequences of a specific class of two Higgs doublet models in which the Higgs induced tree level flavor changing neutral currents (FCNC) display minimal flavor violation are considered. These FCNC are fixed in terms of the Cabibbo Kobayashi Maskawa (CKM) matrix elements and the down quark masses. The minimal model in this category with only two Higgs doublets has no extra CP violating phases, but such a phase can be induced by adding a complex singlet Higgs. The FCNC contribute significantly to B meson mixing and CP violation, but similar contributions in case of the K mesons are suppressed. Detailedmore » numerical analysis to determine the allowed Higgs contributions to neutral meson mixings and the CKM parameters {rho}, {eta} in their presence is presented. The Higgs induced phase in the B{sub d,s}{sup 0}-B{sub d,s}{sup 0} transition amplitude M{sub 12}{sup d,s} is predicted to be equal for the B{sub d} and the B{sub s} systems. There is a strong correlation between |V{sub ub}| and phases {phi}{sub d,s} in M{sub 12}{sup d,s}. A measurable CP violating phase {phi}{sub s}=-0.18{+-}0.08 is predicted on the basis of the observed phase {phi}{sub d} in the B{sub d} system if |V{sub ub}| is large and close to its value determined from the inclusive b decays.« less