Search for a dark photon in electroproduced 
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 pairs with the Heavy Photon Search experiment at JLab

Adrian, P. Hansson; Baltzell, N. A.; Battaglieri, M.; Bondí, M.; Boyarinov, S.V.; Bueltmann, S.; Burkert, V. D.; Calvo, David; Carpinelli, M.; Celentano, A.; Charles, G.; Colaneri, L.; Cooper, W. E.; Cuevas, C.; D’Angelo, A.; Dashyan, N.; Napoli, M. De; Vita, R. De; Deur, A.; Dupré, R.; Egiyan, H.; Elouadrhiri, L.; Essig, Rouven; Fadeyev, V.; Field, C.; Filippi, A.; Freyberger, A.; Garçon, M.; Gevorgyan, N.; Girod, F. X.; Graf, Norman; Graham, M. T.; Griffioen, K. A.; Grillo, A. A.; Guidal, M.; Herbst, R.; Holtrop, M.; Jaros, J. A.; Kalicy, G.; Khandaker, M.; Kubarovsky, V.; Leonora, E.; Livingston, K.; Maruyama, T.; McCarty, K.; McCormick, J.; McKinnon, B.; Moffeit, K.; Moreno, Omar; Camacho, C. Muñoz; Nelson, T. K.; Niccolai, S.; Odian, A.; Oriunno, M.; Osipenko, M.; Paremuzyan, R.; Paul, S.; Randazzo, N.; Raydo, B.; Reese, B.; Rizzo, A.; Schuster, Philip; Sharabian, Y. G.; Simi, G.; Simonyan, A.; Sipala, V.; Sokhan, D.; Solt, Matthew; Stepanyan, S.; Szumila-Vance, Holly; Toro, Natalia; Uemura, Sho; Ungaro, M.; Voskanyan, H.; Weinstein, Larry; Wojtsekhowski, B.; Yale, B.

doi:10.1103/physrevd.98.091101

Cited by 51 publications

(37 citation statements)

References 45 publications

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“…Now, from (20) we find that the γγ → a amplitude, M µν , for a pseudoscalar ALP has the property that…”

Section: A Equivalent Photon Approximation: Closer Comparisonmentioning

confidence: 95%

“…We use (14), together with the supplementary expressions (15)- (20) to calculate the ALP production cross section in Alpaca. We note that to calculate the photon virtuality we do not simply apply (4), which away from the high energy limit is not valid when using (16) to define the momentum fractions x i 1 .…”

Section: Going Beyond the Equivalent Photon Approximation: Low Beam Ementioning

confidence: 99%

“…We first note that due to the fully antisymmetric form of the matrix element (20) all terms ∼ q i in the photon density matrix (19) give a vanishing contribution to the cross section. Therefore the scalar (longitudinal) photon polarizations present for off-shell momenta do not contribute at all.…”

Section: Comparison To Equivalent Photon Approximationmentioning

confidence: 99%

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A fresh look at ALP searches in fixed target experiments

Harland–Lang¹,

Jaeckel

Spannowsky³

2019

Physics Letters B

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A significant number of high power proton beams are available or will go online in the near future. This provides exciting opportunities for new fixed target experiments and the search for new physics in particular. In this note we will survey these beams and consider their potential to discover new physics in the form of axion-like particles, identifying promising locations and set ups. To achieve this, we present a significantly improved calculation of the production of axion-like particles in the coherent scattering of protons on nuclei, valid for lower ALP masses and/or beam energies. We also provide a new publicly available tool for this process: the Alpaca Monte Carlo generator. This will impact ongoing and planned searches based on this process.

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“…Now, from (20) we find that the γγ → a amplitude, M µν , for a pseudoscalar ALP has the property that…”

Section: A Equivalent Photon Approximation: Closer Comparisonmentioning

confidence: 95%

Section: Going Beyond the Equivalent Photon Approximation: Low Beam Ementioning

confidence: 99%

See 1 more Smart Citation

A fresh look at ALP searches in fixed target experiments

Harland–Lang¹,

Jaeckel

Spannowsky³

2019

Physics Letters B

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show abstract

“…The simulation of signal events is based on an A model that has been used for the APEX test run [21] and the HPS experiment [22], and to which light DM particles are added. While this paper focuses on the on-shell production process, the kinematics for DM particle production via an off-shell A would be very similar.…”

Section: Simulated Event Samplesmentioning

confidence: 99%

A high efficiency photon veto for the Light Dark Matter eXperiment

Åkesson

Blinov

Bryngemark

et al. 2020

J. High Energ. Phys.

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Fixed-target experiments using primary electron beams can be powerful discovery tools for light dark matter in the sub-GeV mass range. The Light Dark Matter eXperiment (LDMX) is designed to measure missing momentum in high-rate electron fixed-target reactions with beam energies of 4 GeV to 16 GeV. A prerequisite for achieving several important sensitivity milestones is the capability to efficiently reject backgrounds associated with few-GeV bremsstrahlung, by twelve orders of magnitude, while maintaining high efficiency for signal. The primary challenge arises from events with photo-nuclear

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“…Dark photons will decay into visible SM particles if invisible dark-sector decays are kinematically forbidden. Constraints have been placed on visible A 0 decays by previous beam-dump [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], fixed-target [29][30][31][32], collider [33][34][35][36][37][38], and rare-meson-decay [39][40][41][42][43][44][45][46][47][48] experiments. These experiments ruled out the few-loop region for darkphoton masses mðA 0 Þ ≲ 10 MeV (c ¼ 1 throughout this Letter); however, most of the few-loop region at higher masses remains unexplored.…”

mentioning

confidence: 99%

Search for A′→μ+μ− Decays

Aaij¹,

Beteta²,

Ackernley³

et al. 2020

Phys. Rev. Lett.

Self Cite

214

153

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Searches are performed for both promptlike and long-lived dark photons, A 0 , produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A 0 → μ þ μ − decays using a data sample corresponding to an integrated luminosity of 5.5 fb −1 collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ-A 0 kinetic mixing strength. The promptlike A 0 search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214 < mðA 0 Þ ≲ 740 MeV and 10.6 < mðA 0 Þ ≲ 30 GeV. The search for long-lived A 0 → μ þ μ − decays places world-leading constraints on low-mass dark photons with lifetimes Oð1Þ ps.

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Search for a dark photon in electroproduced e+e− pairs with the Heavy Photon Search experiment at JLab

Cited by 51 publications

References 45 publications

A fresh look at ALP searches in fixed target experiments

A fresh look at ALP searches in fixed target experiments

A high efficiency photon veto for the Light Dark Matter eXperiment

Search for A′→μ+μ− Decays

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