Chromoelectric dipole moments of quarks in MSSM extensions

Aboubrahim, Amin; Ibrahim, Tarek; Nath, Pran; Zorik, Anas

doi:10.1103/physrevd.92.035013

Cited by 15 publications

(17 citation statements)

References 77 publications

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“…The induced phases are, however, small. An analysis including the CP even-CP odd Higgs mixing requires a separate treatment (see, e.g., [32]). We do not include loop induced CP phases in our analysis.…”

Section: Appendix On the Extended Mssm With A Vector Like Leptonicmentioning

confidence: 99%

“…As discussed in several works even with large phases the EDMs can be suppressed either by mass suppression [14,15] or via the cancellation mechanism [16,[16][17][18][19]22]. Several analyses of the vector like extensions of MSSM already exist in the literature [20,21,[23][24][25][26][27][28][29][30][31][32].The outline of the rest of the paper is as follows: In section 2 we give an analytical computation for the contribution of the vectorlike lepton generation to g − 2 of the muon and of the electron. In section (3) we give a numerical analysis of the contributions arising from MSSM and from the extended MSSM with a vector like leptonic generation.…”

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confidence: 99%

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Leptonicg−2moments,CPphases, and the Higgs boson mass constraint

2016

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Higgs boson mass measurement at ∼ 125 GeV points to a high scale for SUSY specifically the scalar masses. If all the scalars are heavy, supersymmetric contribution to the leptonic g − 2 moments will be significantly reduced. On the other hand the Brookhaven experiment indicates a ∼ 3σ deviation from the standard model prediction. Here we analyze the leptonic g − 2 moments in an extended MSSM model with inclusion of a vector like leptonic generation which brings in new sources of CP violation. In this work we consider the contributions to the leptonic g − 2 momentsarising from the exchange of charginos and neutralinos, sleptons and mirror sleptons, and from the exchange of W and Z bosons and of leptons and mirror leptons. We focus specifically on the g − 2 moments for the muon and the electron where sensitive measurements exist. Here it is shown that one can get consistency with the current data on g − 2 under the Higgs boson mass constraint. Dependence of the moments on CP phases from the extended sector are analyzed and it is shown that they are sensitively dependent on the phases from the new sector. It is shown that the corrections to the leptonic moments arising from the extended MSSM sector will be non-vanishing even if the SUSY scale extends into the PeV region. which is about a three sigma deviation from the standard model prediction. Similarly for the electron the experimental determination of g e − 2 is very accurate and the uncertainty is rather small, i.e., one has [4] ∆a e = a This result relies on a QED calculation up to four loops. Thus along with Eq. (1), Eq. (2) also acts as a constraint on the standard model extensions. Supersymmetric theories with low weak scale mass can make corrections to g µ − 2which could be as large as the standard model electroweak corrections and even larger and have strong CP phase dependence [5][6][7] (for early work see [8]). These arise largely from the chargino and sneutrino exchange diagram with the neutralino and smuon exchange diagram making a relatively small contribution. However, if the scalar masses are large, the supersymmetric exchange contributions will be small due to the largeness of the sneutrino and the smuon masses.In this work we give an analysis of the g − 2 for the muon and for the electron in an extended MSSM model with a vector like leptonic generation. We note that vector like multiplets are anomaly free and they appear in a variety of settings which include grand unified models, strings and D brane models [9][10][11][12][13]. Further, it is known that g − 2 has a sharp dependence on CP phases [5][6][7]. For this reason we investigate also the dependence of the muon and the electron g − 2 on the CP phases in the extended MSSM model. Here we are particularly interested in the dependence on the CP phases that arise from the new sector involving vector like leptons. We note that the CP phases are constrained in this case by the electric dipole moment of the electron which currently has the value |d e | < 8.7 × 10 −29ecm [34] while the upper...

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Section: Appendix On the Extended Mssm With A Vector Like Leptonicmentioning

confidence: 99%

mentioning

confidence: 99%

Leptonicg−2moments,CPphases, and the Higgs boson mass constraint

2016

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“…Further, they are anomaly free. Several analyses have recently appeared which utilize such multiplets [26,27,28,29,30,31,32,33,34,35]. Here we focus on the quark sector where the vectorlike multiplet consists of a fourth generation of quarks and their mirror quarks.…”

Section: The Model and Notationmentioning

confidence: 99%

Flavor violating top decays and flavor violating quark decays of the Higgs boson

Ibrahim

Itani

Nath

et al. 2017

Int. J. Mod. Phys. A

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In the standard model flavor violating decays of the top quark and of the Higgs boson are highly suppressed. Further, the flavor violating decays of the top and of the Higgs are also small in MSSM and not observable in current or in near future experiment. In this work we show that much larger branching ratios for these decays can be achieved in an extended MSSM model with an additional vector like quark generation. Specifically we show that in the extended model one can achieve branching ratios for t → h 0 c and t → h 0 u as large as the current experimental upper limits given by the ATLAS and the CMS Collaborations. We also analyze the flavor violating quark decay of the Higgs boson, i.e., h 0 → bs +bs and h 0 → bd +bd. Here again one finds that the branching ratio for these decays can be as large as O(1)%. The analysis is done with inclusion of the CP phases in the Higgs sector, and the effect of CP phases on the branching ratios is investigated. Specifically the Higgs sector spectrum and mixings are computed involving quarks and mirror quarks, squarks and mirror squarks in the loops consistent with the Higgs boson mass constraint. The resulting effective Lagrangian with inclusion of the vector like quark generation induce flavor violating decays at the tree level. The test of the branching ratios predicted could come with further data from LHC13 and such branching ratios could also be accessible at future colliders such as the Higgs factories where the Higgs couplings to fermions will be determined with greater precision.

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“…Several analyses have recently appeared which utilize vectorlike multiplets [28,29,30,31,32,33,34,35,36] Here we focus on the quark sector where the vectorlike multiplet consists of a fourth generation of quarks and their mirror quarks. Thus the quark sector of the extended MSSM model is given by where …”

Section: The Model and Notationmentioning

confidence: 99%

Higgs boson mass constraint and theCPeven-CPodd Higgs boson mixing in an MSSM extension

Ibrahim¹,

Nath²,

Zorik³

2016

Phys. Rev. D

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One loop contributions to the CP even-CP odd Higgs boson mixings arising from contributions due to exchange of a vectorlike multiplet are computed under the Higgs boson mass constraint. The vectorlike multiplet consists of a fourth generation of quarks and a mirror generation. This sector brings in new CP phases which can be large consistent with EDM constraints. In this work we compute the contributions from the exchange of quarks and mirror quarks t 4L , t 4R , T L , T R , and their scalar partners, the squarks and the mirror squarks. The effect of their contributions to the Higgs boson masses and mixings are computed and analyzed. The possibility of measuring the effects of mixing of CP even and CP odd Higgs in experiment is discussed. It is shown that the branching ratios of the Higgs bosons into fermion pairs are sensitive to new physics and specifically to CP phases.

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Chromoelectric dipole moments of quarks in MSSM extensions

Cited by 15 publications

References 77 publications

Leptonicg−2moments,CPphases, and the Higgs boson mass constraint

Leptonicg−2moments,CPphases, and the Higgs boson mass constraint

Flavor violating top decays and flavor violating quark decays of the Higgs boson

Higgs boson mass constraint and theCPeven-CPodd Higgs boson mixing in an MSSM extension

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