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9 papers found.
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Opening up the QCD axion window

Abstract We present a new mechanism to deplete the energy density of the QCD axion, making decay constants as high as f a ≃ 1017 GeV viable for generic initial conditions. In our setup, the axion couples to a massless dark photon with a coupling that is moderately stronger than the axion coupling to gluons. Dark photons are produced copiously through a tachyonic instability when...

Small vacuum energy from small equivalence violation in scalar gravity

The theory of scalar gravity proposed by Nordström, and refined by Einstein and Fokker, provides a striking analogy to general relativity. In its modern form, scalar gravity appears as the low-energy effective field theory of the spontaneous breaking of conformal symmetry within a CFT, and is AdS/CFT dual to the original Randall-Sundrum I model, but without a UV brane. Scalar...

Deciphering the MSSM Higgs mass at future hadron colliders

Abstract Future hadron colliders will have a remarkable capacity to discover massive new particles, but their capabilities for precision measurements of couplings that can reveal underlying mechanisms have received less study. In this work we study the capability of future hadron colliders to shed light on a precise, focused question: is the higgs mass of 125 GeV explained by the...

Experimental considerations motivated by the diphoton excess at the LHC

We consider the immediate or near-term experimental opportunities offered by some scenarios that could explain the new diphoton excess at the LHC. If the excess is due to a new particle X s at 750 GeV, additional new particles are required, providing further signals. If connected with naturalness, the X s may be produced in top partner decays. Then a \( t^{\prime}\overline{t...

A couplet from flavored dark matter

We show that a couplet, a pair of closely spaced photon lines, in the X-ray spectrum is a distinctive feature of lepton flavored dark matter models for which the mass spectrum is dictated by Minimal Flavor Violation. In such a scenario, mass splittings between different dark matter flavors are determined by Standard Model Yukawa couplings and can naturally be small, allowing all...

Identifying dark matter interactions in monojet searches

Prateek Agrawal 1 Vikram Rentala 0 0 Department of Physics & Astronomy, Michigan State University , E. Lansing, MI 48824, U.S.A 1 Fermilab National Accelerator Laboratory , Batavia, IL , 60510

Flavored dark matter beyond Minimal Flavor Violation

We study the interplay of flavor and dark matter phenomenology for models of flavored dark matter interacting with quarks. We allow an arbitrary flavor structure in the coupling of dark matter with quarks. This coupling is assumed to be the only new source of violation of the Standard Model flavor symmetry extended by a U(3) χ associated with the dark matter. We call this ansatz...

Mixing stops at the LHC

Prateek Agrawal Claudia Frugiuele Fermilab P.O. Box Batavia IL U.S.A. We study the phenomenology of a light stop NLSP in the presence of large mixing with either the first or the second generation

Leptophilic dark matter and the anomalous magnetic moment of the muon

Prateek Agrawal 1 Zackaria Chacko 0 Christopher B. Verhaaren 0 0 Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, Physical Sciences Complex, College Park , MD