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9 papers found.
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A tale of two portals: testing light, hidden new physics at future e + e − colliders

We investigate the prospects for producing new, light, hidden states at a future e + e − collider in a Higgsed dark U(1) D model, which we call the Double Dark Portal model. The simultaneous presence of both vector and scalar portal couplings immediately modifies the Standard Model Higgsstrahlung channel, e + e − → Zh, at leading order in each coupling. In addition, each portal ...

Phenomenology of enhanced light quark Yukawa couplings and the W±h charge asymmetry

I propose the measurement of the W ± h charge asymmetry as a consistency test for the Standard Model (SM) Higgs, which is sensitive to enhanced Yukawa couplings of the first and second generation quarks. I present a collider analysis for the charge asymmetry in the same-sign lepton final state, pp → W ± h → (ℓ ± ν) (ℓ ± νjj), aimed at discovery significance for the SM W ± h ...

Angular observables for spin discrimination in boosted diboson final states

We investigate the prospects for spin determination of a heavy diboson resonance using angular observables. Focusing in particular on boosted fully hadronic final states, we detail both the differences in signal efficiencies and distortions of differential distributions resulting from various jet substructure techniques. We treat the 2 TeV diboson excess as a case study, but our ...

Hunting for dark matter coannihilation by mixing dijet resonances and missing transverse energy

Simplified models of the dark matter (co)annihilation mechanism predict striking new collider signatures untested by current searches. These models, which were codified in the coannihilation codex, provide the basis for a dark matter (DM) discovery program at the Large Hadron Collider (LHC) driven by the measured DM relic density. In this work, we study an exemplary model featuring ...

The coannihilation codex

We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X → SM1 + SM2, where X is a coannihilation partner for the DM particle and SM1, SM2 are Standard Model fields. Our classification also encompasses regular DM pair annihilation scenarios if DM and X are identical. Each coannhilation scenario motivates the ...

Indirect probes of the MSSM after the Higgs discovery

We study the minimal supersymmetric standard model (MSSM) with minimal flavor violation (MFV), imposing constraints from flavor physics observables and MSSM Higgs searches, in light of the recent discovery of a 125 GeV Higgs boson by ATLAS and CMS. We analyze the electroweak vacuum stability conditions to further restrict the MSSM parameter space. In addition, a connection to ...

New physics models of direct CP violation in charm decays

In view of the recent LHCb measurement of ΔA CP, the difference between the time-integrated CP asymmetries in D → K + K − and D → π+π− decays, we perform a comparative study of the possible impact of New Physics degrees of freedom on the direct CP asymmetries in singly Cabibbo suppressed D meson decays. We systematically discuss scenarios with a minimal set of new degrees of ...

Compatibility of θ 13 and the Type I seesaw model with A 4 symmetry

We derive formulae for neutrino masses and mixing angles in a type I seesaw framework with an underlying A 4 flavor symmetry. In particular, the Majorana neutrino mass matrix includes contributions from an A 4 triplet, 1, 1′, and 1′′ flavon fields. Using these formulae, we constrain the general A 4 parameter space using the updated global fits on neutrino mixing angles and mass ...

Measuring slepton masses and mixings at the LHC

Flavor physics may help us understand theories beyond the standard model. In the context of supersymmetry, if we can measure the masses and mixings of sleptons and squarks, we may learn something about supersymmetry and supersymmetry breaking. Here we consider a hybrid gauge-gravity supersymmetric model in which the observed masses and mixings of the standard model leptons are ...