Impact of CP phases on a light sbottom and gluino sector

Chen, Chuan-Hung

doi:10.1016/j.physletb.2003.11.020

Cited by 2 publications

(1 citation statement)

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“…This motivated an avalanche of phenomenological studies in this CPV-MSSM framework . In the presence of CPV complex parameters, the top and bottom squarks couplings to the Higgs state will be modified substantially in a large domain of the MSSM parameter space [77][78][79][80][81]. Conversely though the CP phases in the MSSM are significantly constrained by the EDM measurements.…”

Section: Introductionmentioning

confidence: 99%

125 GeV Higgs signal at the LHC in theCP-violating MSSM

et al. 2014

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The ATLAS and CMS collaborations have observed independently at the Large Hadron Collider (LHC) a new Higgs-like particle with a mass M h ∼ 125 GeV and properties similar to that predicted by the Standard Model (SM). Although the measurements indicate that this Higgs-like boson is compatible with the SM hypothesis, however due to large uncertainties in some of the Higgs detection channels, one still has the possibility of testing this object as being a candidate for some Beyond the SM (BSM) physics scenarios, for example, the Minimal Supersymmetric Standard Model (MSSM), in the CP-conserving version (CPC-MSSM). In this paper, we evaluate the modifications of these CPC-MSSM results when CP-violating (CPV) phases are turned on explicitly, leading to the CP-violating MSSM (CPV-MSSM). We investigate the role of the CPV phases in (some of) the soft Supersymmetry (SUSY) terms on both the mass of the lightest Higgs boson h 1 , and the rates for the processesat the LHC, considering the impact of the flavor constraints as well as the constraints coming from the Electric Dipole Moment (EDM) measurements. We find that it is possible to have a Higgs mass of about 125 GeV with relatively small tan β, large A t and a light stop, which is consistent with the current SUSY particle searches at the LHC. We obtain that the imaginary part of the top and bottom Yukawa couplings can take very small but non-zero values even after satisfying the recent updates from both the ATLAS and CMS collaborations within 1-2σ uncertainties which might be an interesting signature to look for at the future run of the LHC. Our study shows that the CPV-MSSM provides an equally potential solution (like its CP-conserving (CPC) counterpart) to the recent LHC Higgs data, in fact offering very little in the way of distinction arXiv:1301.2745v3 [hep-ph] 15 Aug 2014 between these two SUSY models (CPC-MSSM and CPV-MSSM) at the 7 and 8 TeV run of the LHC. Improvement in different Higgs coupling measurements is necessary in order to test the possibility of probing the small dependence on these CPV phases in the Higgs sector of the MSSM.

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Section: Introductionmentioning

confidence: 99%

125 GeV Higgs signal at the LHC in theCP-violating MSSM

et al. 2014

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Flavors and phases in unparticle physics

Chen

Geng

2008

Physics Letters B

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Inspired by the recent Georgi's unparticle proposal, we study the flavor structures of the standard model (SM) particles when they couple to unparticles. At a very high energy scale, we introduce BZ charges for the SM particles, which are universal for each generation and allow BZ fields to distinguish flavor generations. At the Λ U scale, BZ operators and charges are matched onto unparticle operators and charges, respectively. In this scenario, we find that tree flavor changing neutral currents (FCNCs) can be induced by the rediagonalizations of the SM fermions. As an illustration, we employ the Fritzsch ansatz to the SM fermion mass matrices and we find that the FCNC effects could be simplified to be associated with the mass ratios denoted by m i m j /m 2 3 , where m 3 is the mass of the heaviest particle in each type of fermion generations and i, j are the flavor indices. In addition, we show that there is no new CP violating phase for FCNCs in down type quarks beside the unique one in the CKM matrix. We useB q → ℓ + ℓ − as examples to display the new FCNC effects. In particular, we demonstrate that the direct CP asymmetries in the decays can be O(10%) due to the peculiar CP conserving phase in the unparticle propagator. * In the standard model (SM), it is known that flavor changing processes at tree level can only be generated for charged currents mediated the W gauge boson in the quark sector.These charged currents will induce flavor changing neutral currents (FCNCs) via quantum loops. Consequently, the most impressive features of flavor physics are the Glashow-Iliopoulos-Maiani (GIM) mechanism [1] and the large top quark mass [3]. For instance, the former makes the P 0 −P 0 (P = K and D) mixings and rare P decays naturally small while the latter leads to large B q −B q mixings (q = d, s) as well as the time-dependence CP asymmetry for the decay of B d → J/ΨK S . Among these effects, the most important measured quantities are the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements [2], coming from the unitary matrices which diagonalize the left-handed up and down-type quark matrices. Although there are no disagreements between the SM and experiments, which might give us some clue as to what may lie beyond the SM, it is important to keep searching for any discrepancies. In particular, the next generation of flavor factories such as SuperKEKB [4] and LHCb [5] with design luminosities of 5 × 10 35 and 5 × 10 32 cm −2 s −1 , respectively, may provide some hints for new flavor effects. Thus, theoretically it should be interesting to explore the possible new phenomena related to flavor physics [6, 7].Recently, Georgi has proposed that an invisible sector dictated by the scale invariant may weakly couple to the particles of the SM [8,9]. Since the scale invariant stuff cannot have a definite mass unless it is zero, it should be made of unparticles [8] as the SM particles have definite masses. In terms of the two-point function with the scale invariance, it is found that the unparticle with the scaling dimension d U beh...

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Impact of CP phases on a light sbottom and gluino sector

Cited by 2 publications

References 50 publications

125 GeV Higgs signal at the LHC in theCP-violating MSSM

125 GeV Higgs signal at the LHC in theCP-violating MSSM

Flavors and phases in unparticle physics

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