Stringent limits on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:mi>γ</mml:mi><mml:mi>X</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>decay from neutrino experiments and constraints on new l

Gninenko, S.

doi:10.1103/physrevd.85.055027

Cited by 71 publications

(31 citation statements)

References 37 publications

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“…Other Experiments Searches for heavy neutrinos decaying to leptons were carried out at NOMAD [101] and PS-191 [102], and reinterpreted as searches for hidden vectors in Ref. [79]. We find that the limits from other hidden decays then Z x → l + l − are inferior to those from CHARM.…”

Section: Ingrid Ingridmentioning

confidence: 99%

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New limits on light hidden sectors from fixed-target experiments

Morrissey

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2014

J. High Energ. Phys.

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New physics can be light if it is hidden, coupling very weakly to the Standard Model. In this work we investigate the discovery prospects of Abelian hidden sectors in lower-energy fixed-target and high-precision experiments. We focus on a minimal supersymmetric realization consisting of an Abelian vector multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs multiplets. This simple theory can give rise to a broad range of experimental signals, including both commonly-studied patterns of hidden vector decay as well as new and distinctive hidden sector cascades. We find limits from the production of hidden states other than the vector itself. In particular, we show that if the hidden Abelian symmetry is higgsed, and the corresponding hidden Higgs boson has visible decays, it severely restricts the ability of the hidden sector to explain the anomalous muon magnetic moment.

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Section: Ingrid Ingridmentioning

confidence: 99%

“…Hadronic fixed target experiments can also be used to constrain low-energy hidden sectors [15,16,20,[75][76][77][78][79]. This is particularly relevant for hidden sectors with GeV-scale masses, where most constraints from electron experiments are limited by kinematics.…”

Section: Hadronic Fixed Target Experimentsmentioning

confidence: 99%

New limits on light hidden sectors from fixed-target experiments

Morrissey

Spray

2014

J. High Energ. Phys.

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“…A well-motivated hypothetical particle is the dark photon A which inherits a small coupling to the SM via kinetic mixing with the ordinary photon γ [1][2][3][4][5][6]. Indeed, some of the most stringent constraints on the properties of dark photons come from rare decays of mesons, including π 0 → γA [7][8][9][10][11][12][13][14], η/η → γA [15,16], and φ → ηA [17,18].…”

Section: Introductionmentioning

confidence: 99%

Dark photons from charm mesons at LHCb

et al. 2015

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We propose a search for dark photons A 0 at the LHCb experiment using the charm meson decay D Ã ð2007Þ 0 → D 0 A 0 . At nominal luminosity, D Ã0 → D 0 γ decays will be produced at about 700 kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of the LHC. Replacing the photon with a kinetically mixed dark photon, LHCb is then sensitive to dark photons that decay as A 0 → e þ e − . We pursue two search strategies in this paper. The displaced strategy takes advantage of the large Lorentz boost of the dark photon and the excellent vertex resolution of LHCb, yielding a nearly background-free search when the A 0 decay vertex is significantly displaced from the proton-proton primary vertex. The resonant strategy takes advantage of the large event rate for D Ã0 → D 0 A 0 and the excellent invariant-mass resolution of LHCb, yielding a background-limited search that nevertheless covers a significant portion of the A 0 parameter space. Both search strategies rely on the planned upgrade to a triggerless-readout system at LHCb in Run 3, which will permit the identification of low-momentum electron-positron pairs online during data taking. For dark photon masses below about 100 MeV, LHCb can explore nearly all of the dark photon parameter space between existing prompt-A 0 and beam-dump limits.

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“…A particularly compelling dark-force scenario is that of a dark photon A which has small SM couplings via kinetic mixing with the ordinary photon through the operator 2 F µν F µν [2][3][4][5][6][7]. Previous beam dump [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], fixed target [22][23][24], collider [25][26][27], and rare meson decay [28][29][30][31][32][33][34][35][36][37] experiments have already played a crucial role in constraining the dark photon mass m A and kineticmixing strength 2 . Large regions of the m A -2 plane, however, are still unexplored (see Fig.…”

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Proposed Inclusive Dark Photon Search at LHCb

et al. 2016

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We propose an inclusive search for dark photons A 0 at the LHCb experiment based on both prompt and displaced dimuon resonances. Because the couplings of the dark photon are inherited from the photon via kinetic mixing, the dark photon A 0 → μ þ μ − rate can be directly inferred from the off-shell photon γ Ã → μ þ μ − rate, making this a fully data-driven search. For run 3 of the LHC, we estimate that LHCb will have sensitivity to large regions of the unexplored dark-photon parameter space, especially in the 210-520 MeV and 10-40 GeV mass ranges. This search leverages the excellent invariant-mass and vertex resolution of LHCb, along with its unique particle-identification and real-time data-analysis capabilities. DOI: 10.1103/PhysRevLett.116.251803 Dark matter-firmly established through its interactions with gravity-remains an enigma. Though there are increasingly stringent constraints on direct couplings between visible matter and dark matter, little is known about the dynamics within the dark sector itself. An intriguing possibility is that dark matter might interact via a new dark force, felt only feebly by standard model (SM) particles. This has motivated a worldwide effort to search for dark forces and other portals between the visible and dark sectors (see Ref.[1] for a review).A particularly compelling dark-force scenario is that of a dark photon A 0 which has small SM couplings via kinetic mixing with the ordinary photon through the operator ðϵ=2ÞF 0 μν F μν [2][3][4][5][6][7]. Previous beam dump [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], fixed target [22][23][24], collider [25][26][27], and rare meson decay [28][29][30][31][32][33][34][35][36][37] experiments have already played a crucial role in constraining the dark photon mass m A 0 and kinetic-mixing strength ϵ 2 . Large regions of the m A 0 − ϵ 2 plane, however, are still unexplored (see Fig. 1). Looking to the future, a wide variety of innovative experiments have been proposed to further probe the dark photon parameter space [38][39][40][41][42][43][44][45][46][47][48], though new ideas are needed to test m A 0 > 2m μ and ϵ 2 ∈ ½10 −7 ; 10 −11 .In this Letter, we propose a search for dark photons via the decayat the LHCb experiment during LHC run 3 (scheduled for 2021-2023). The potential of LHCb to discover dark photons was recently emphasized in Ref.[48], which exploits the exclusive charm decay modeHere, we consider an inclusive approach where the production mode of A 0 need not be specified. An important feature of this search is that it can be made fully data driven, since the A 0 signal rate can be inferred from measurements of the SM prompt μ þ μ − spectrum. The excellent invariant-mass and vertex resolution of the LHCb detector, along with its unique particle-identification and real-time data-analysis capabilities [50,51], make it highly sensitive to A 0 → μ þ μ − . We derive the LHCb sensitivity for both prompt and displaced A 0 decays, and show that LHCb can probe otherwise inaccessible regions of the m A 0 − ϵ 2 plane...

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Stringent limits on theπ0→γX,X→e+e−decay from neutrino experiments and constraints on new l

Cited by 71 publications

References 37 publications

New limits on light hidden sectors from fixed-target experiments

New limits on light hidden sectors from fixed-target experiments

Dark photons from charm mesons at LHCb

Proposed Inclusive Dark Photon Search at LHCb

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