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Chromomagnetic and chromoelectric dipole moments of quarks in the reduced 331 model

Chinese Physics C 2021年第11期45卷 11-24页

作者： A.I.Hemandez-Juarez g.tavares-velasco A.Moyotl Facultad de Ciencias Fisico Matematicas Benemerita Universidad Autonoma de PueblaApartado Postal 1152PueblaPueblaMexico Ingenieria en Mecatronica Universidad Politecnica de PueblaTercer Carril del Ejido Serrano s/nSan Mateo CuanalaJuan C.BonillaPueblaPueblaMexico

The one-loop contributions to the chromomagnetic dipole momentˆμt(q2)and electric dipole momentˆd t(q2)of the top quark are calculated within the reduced 331 model(RM331)for non-zero *** is argued that the results are gauge independent and thus represent valid observable *** the RM331,ˆμt(q2)receives new contributions from two heavy gauge bosons,namely Z′and V±,and one neutral scalar boson h2,along with a new contribution from the standard model's Higgs boson via flavor changing neutral *** latter,which is also mediated by the Z′gauge boson and the scalar boson h2,can provide a non-vanishingˆd t(q2)if there is a CP-violating *** analytical results are presented in terms of both Feynman parameter integrals and Passarino-Veltman scalar functions,which are useful to cross-check the numerical ***ˆμt(q2)andˆd t(q2)are numerically evaluated for parameter values still allowed by the constraints from experimental *** is found that the new one-loop contributions of the RM331 to the real(imaginary)part ofˆμt(q2)are of the order of 10−5(10−6),which means at least three orders of magnitude smaller than the standard model prediction but larger than the predictions of other models of new *** the RM331,the dominant contribution arises from the V±gauge boson for‖q‖in the 30-1000 geV interval and a mass mV of the order of a few hundreds of *** forˆd t(q2),it receives its largest contribution from h2 exchange and can reach values of the order of 10−19,i.e.,smaller than the contributions predicted by other standard model extensions.

关键词： chromomagnetic chromoelectric 331 models

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Polarized and unpolarized off-shell H^(*)→ZZ→4■ decay above the 2m_(z) threshold

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Chinese Physics C 2024年第11期48卷 22-42页

作者： A.I.Hernandez-Juarez R.gaitan g.tavares-velasco Departamento de Fisica FES-CuautitlanUniversidad Nacional Autonoma de MexicoC.P.54770Estado de MexicoMexico Facultad de Ciencias Fisico Matematicas Benemerita Universidad Autonoma de PueblaApartado Postal 1152PueblaPueblaMexico

An analysis of the off-shell H^(*)→Zz-■_(1)■_(1)■_(2)■_(2) decay width is presented for both unpolarized and polarized Z gauge bosons in the scenario with the most general H^(*)ZZ vertex function,which is expressed in terms of two CP-even(bz and cz)and one CP-odd(bz)anomalous *** SM contributions to the H^(*)ZZ coupling up to the one-loop level are also *** analytic results for the unpolarized and polarized H^(*)-Zz-■_(1)■_(1)■_(2)■_(2) square amplitudes and the four-body phase space are presented,out of which several obseryable quantities can be obtained *** numerical analysis,a cross-check was performed via Madgraph5_aMC@NLO,where our model was implemented with the aid of *** then considered the most stringent bounds on anomalous complex H^(*)ZZ couplings and analyzed the effects of the polarizations of the Z gauge bosons through the polarized H^(*)-ZZ→■_(1)■_(1)■_(2)■_(2) decay width as well as left-right and forward-backward asymmetries,which were found to be sensitive to new-physics *** focus was put on the effects of the absorptive parts of the anomalous H^(*)ZZ couplings,which have been largely overlooked up to now in LHC *** was found that the studied observable quantities,particularly the left-right asymmetries,can be helpful to search for effects of CP-violation in the H^(*)ZZ coupling and set bounds on the absorptive *** completeness,we also analyzed the case of unpolarized Z gauge bosons.

关键词： polarization off-shell Higgs anomalous couplings CP violation

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