A Milli-Window to Another World

Abstract

The kinetic mixing of the vector boson of hypercharge with the vector boson(s) associated with particle sectors beyond the Standard Model is one of the best motivated windows to new physics. The resulting phenomenology depends on whether the new vector boson is massive or massless. The phenomenology associated with the massive phase has received considerable attention in recent years with many theoretical explorations and new experimental efforts, while the massless phase is linked to the phenomenology of milli-charged particles. In this paper we introduce the more general case where the kinetic mixing is with a vector boson that is a linear combination of both a massive and a massless state (as hypercharge is in the Standard Model). We demonstrate that the general phase is only weakly constrained when the mass scale associated with it is above about 100 MeV. Finally, we show that a new dedicated experiment at the LHC, proposed recently in Ref. [1], can explore large parts of the parameter space in the mass range between 100 MeV and 100 GeV. In particular, it is uniquely sensitive to a new signature that only arises in the general phase.

11 pages, 3 figures

References in corpus (26)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• A Theory of Dark Matter
• Secluded WIMP Dark Matter
• Secluded U(1) below the weak scale
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Illuminating Dark Photons with High-Energy Colliders
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Non-Abelian Dark Sectors and Their Collider Signatures
• Turning off the Lights: How Dark is Dark Matter?
• Probing Dark Forces and Light Hidden Sectors at Low-Energy e+e- Colliders
• Forbidden Dark Matter
• An Improved Limit on Invisible Decays of Positronium
• Constraints on Hidden Photon Models from Electron g-2 and Hydrogen Spectroscopy
• Leptophobic Dark Matter at Neutrino Factories
• Signatures of sub-GeV dark matter beams at neutrino experiments
• Looking for milli-charged particles with a new experiment at the LHC
• Testing GeV-Scale Dark Matter with Fixed-Target Missing Momentum Experiments
• DAEdALUS and Dark Matter Detection
• Physics Motivation for a Pilot Dark Matter Search at Jefferson Laboratory
• The Heavy Photon Search Test Detector
• PAMELA, DAMA, INTEGRAL and Signatures of Metastable Excited WIMPs
• GeV-scale dark matter: production at the Main Injector
• Search for the Invisible Decay of $\jpsi$ in $\psi (2S)\to \pi +{\pi }^{-}J/\psi$
• Searching for dilepton resonances below the Z mass at the LHC
• First direct limits on Lightly Ionizing Particles with electric charge less than $e/6$

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• Search for millicharged particles in proton-proton collisions at $\sqrt{s}=13$ TeV
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• Probing millicharged particles with NA64 experiment at CERN
• Constraints on millicharged particles with low threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory
• Minicharged Particles from the Sun: A Cutting-Edge Bound
• Earth-bound Milli-charge Relics
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• Passage of millicharged particles in the electron beam-dump: refining constraints from SLACmQ and estimating sensitivity of NA64e
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• Results on photon-mediated dark matter-nucleus interactions from the PICO-60 C${}_3$F${}_8$ bubble chamber
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• Search for millicharged particles in proton-proton collisions at $\sqrt{s}=13.6$ TeV
• Relic abundance of MeV millicharged particles
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