Explicit<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>violation in a MSSM with an extra<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>′</mml:mo></mml:msup></mml:math>

Ham, S. W.; Yoo, E. J.; Oh, S. K.

doi:10.1103/physrevd.76.015004

Cited by 30 publications

(48 citation statements)

References 56 publications

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“…These exotic quarks and leptons do not have a Yukawa coupling to the doublet Higgs and, as they are vector-like under MSSM, they do not enhance the observed Higgs production cross section, assuming that the lightest Higgs boson is SM-like. They would affect production of the heavier neutral Higgs boson, and might contribute to CP mixing between the heaviest scalar and the pseudoscalar Higgs bosons [38]. But definite constraints on their masses and couplings would come only from direct searches.…”

Section: U(1) ′ Benchmark Points and Relic Densitymentioning

confidence: 99%

Neutralino and chargino production in U(1)′ at the LHC

2013

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We examine the production and decay modes of neutralinos and charginos in a softly-broken supersymmetric model with an extra Abelian symmetry U(1) ′ . We perform the study in a U(1) ′ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for Z ′ is resolved by incorporating three additional SU(2) singlet fields into the model. Although the chargino sector is the same as in the MSSM, the neutralino sector of the model is very rich: five new fermion fields are added to the neutral sector bring the total neutralino states to nine. We implement the model into standard packages and perform a detailed and systematic analysis of production and decay modes at the LHC, for three different scenarios, consistent with the Higgs data and relic density constraints. We concentrate on final signals (1) 1ℓ + jets+ E T , (2) 2ℓ + jets+ E T and (3) 3ℓ + 0 jets+ E T , and comment on the case with 0ℓ + jets+ E T . We discuss backgrounds and indicate how these signals can be observed, and how the model can be distinguished from other supersymmetric model scenarios.

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Section: U(1) ′ Benchmark Points and Relic Densitymentioning

confidence: 99%

Neutralino and chargino production in U(1)′ at the LHC

2013

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“…Especially, a Higgs boson which has escaped the detection at LEP 2 [12] and/or perhaps weighs around 125 GeV as hinted by the recent ATLAS/CMS results [13] has pushed the MSSM to the edge of the allowed parameter space that can be consistent with a first-order EWPT [11]. This tension, however, could be relaxed if the MSSM is extended [14][15][16][17][18][19][20].…”

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confidence: 99%

Singlino-driven electroweak baryogenesis in the next-to-MSSM

et al. 2012

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We explore a new possibility of electroweak baryogenesis in the next-to-minimal supersymmetric standard model. In this model, a strong first-order electroweak phase transition can be achieved due to the additional singlet Higgs field. The new impact of its superpartner (singlino) on the baryon asymmetry is investigated by employing the closed-time-path formalism. We find that the CP violating source term fueled by the singlino could be large enough to generate the observed baryon asymmetry of the Universe without any conflicts with the current constraints from the non-observation of the Thallium, neutron and Mercury electric dipole moments.

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“…Besides, the discrete Z 2 symmetry required for stabilizing dark matter candidates can naturally emerge from a local U(1) gauge group [8][9][10][11][12][13][14][15]. An extra U(1) has also been employed in supersymmetric models [16][17][18][19][20] (so-called UMSSM) to facilitate a strong first order electroweak phase transition, as required to realize successful electroweak baryogenesis [21]. Properties of such Z ′ bosons strongly depend on the origin of the corresponding U(1) symmetry in models.…”

Section: Introductionmentioning

confidence: 99%

Phenomenology of E 6-inspired leptophobic Z ′ boson at the LHC

Chiang

Nomura²,

Yagyu³

2014

J. High Energ. Phys.

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Abstract:We study collider phenomenology of a leptophobic Z ′ boson existing in eight scenarios of the E 6 grand unified theory, differing in particle embeddings. We first review the current bound on the Z ′ mass m Z ′ based upon the LHC data of pp → tt process at 8 TeV collisions with an integrated luminosity of 19.6 fb −1 . Most scenarios have a lower bound of about 1 TeV. However, this constraint does not apply to the case where m Z ′ < 2m t , and other methods need to be employed for this lower mass regime. Using existing UA2 constraints and dijet data at the LHC, we find that only one of the eight scenarios is excluded at 95% confidence level. No bound can be obtained from W jj and Zjj measurements. We propose to use the photon associated production of the Z ′ boson that subsequently decays into a pair of bottom quarks, pp → Z ′ γ → bbγ, at the LHC to explore the constraints in the lower mass regime. We compute the expected signal significance as a function of m Z ′ using detailed simulations of signal and irreducible background events. We find constraints for two more scenarios using the 8-TeV data and taking appropriate kinematical cuts. We also show the discovery reach for each scenario at the 14-TeV LHC machine.

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ExplicitCPviolation in a MSSM with an extraU(1)′

Cited by 30 publications

References 56 publications

Neutralino and chargino production in U(1)′ at the LHC

Neutralino and chargino production in U(1)′ at the LHC

Singlino-driven electroweak baryogenesis in the next-to-MSSM

Phenomenology of E 6-inspired leptophobic Z ′ boson at the LHC

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