Search for axion-like particle production in 400 GeV proton-copper interactions

Bergsma, F.; Dorenbosch, J.; Allaby, J.; Amaldi, U.; Barbiellini, G.; Berger, Christoph; Flegel, W.; Lanceri, L.; Metcalf, Michael; Nieuwenhuis, C.; Panman, J.; Santoni, C.; Winter, K.; Abt, I.; Aspiazu, J.; Büsser, F.W.; Daumann, H.; Gall, P. D.; Hebbeker, T.; Niebergall, F.; Schütt, P.; Stähelin, P.; Gorbunov, P.; Grigoriev, E.; Kaftanov, V.; Khovansky, V.; Rosanov, A.; Baroncelli, A.; Barone, L.; Borgia, B.; Bosio, C.; Capone, A.; Diemoz, M.; Dore, U.; Ferroni, F.; Luminari, L.; Monacelli, P.; Notaristefani, F. De; Pistilli, P.; Santacesaria, R.; Tortora, L.; Valente, V.

doi:10.1016/0370-2693(85)90400-9

Cited by 303 publications

(326 citation statements)

References 9 publications

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“…Another potentially relevant experiment is the proton beam dump on copper CHARM experiment [32]. In [32] constraints were derived assuming that the production cross section and decay length of light pseudoscalars correspond to the one of axions, which is not the case here.…”

Section: Jhep11(2016)039mentioning

confidence: 99%

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Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Ellwanger

Moretti

2016

J. High Energ. Phys.

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Abstract:We estimate the values of Yukawa couplings of a light pseudoscalar A with a mass of about 17 MeV, which would explain the 8 Be anomaly observed in the Atomki pair spectrometer experiment. The resulting couplings of A to up and down type quarks are about 0.3 times the coupling of the standard Higgs boson. Then constraints from K and B decays require that loop contributions to flavour changing vertices cancel at least at the 10% level. Constraints from beam dump experiments require the coupling of A to electrons to be larger than about 4 times the coupling of the standard Higgs boson, leading to a short enough A life time consistent with an explanation of the anomaly.

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Section: Jhep11(2016)039mentioning

confidence: 99%

“…In [32] constraints were derived assuming that the production cross section and decay length of light pseudoscalars correspond to the one of axions, which is not the case here. Relevant is the analysis in [11] which uses the production of light pseudoscalars in K → π + A and B → X + A decays.…”

Section: Jhep11(2016)039mentioning

confidence: 99%

Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Ellwanger

Moretti

2016

J. High Energ. Phys.

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“…[33], we look at the bounds set by the CHARM Collaboration [82]. In this experiment, a 400 GeV proton beam was dumped into a thick copper target ( √ s ≈ 2E p m p ≈ 27.4 GeV) and the decay of a long-lived axion to photons, electrons or muons was searched for in a 35 m long decay region placed 480 m from the target.…”

Section: Fixed Targetmentioning

confidence: 99%

“…where γβm h ∼ 10 GeV, L 1 = L 2 −35 m = 480 m, and N h ≈ 2.9×10 17 ×σ h /σ π 0 is normalised to the neutral pion yield [82]. We adopt σ π 0 ≈ σ pp M pp /3, where M pp is the average hadron multiplicity and σ pp is the proton-proton cross section [33].…”

Section: Jhep02(2014)123mentioning

confidence: 99%

Phenomenology of a very light scalar (100 MeV < m h < 10 GeV) mixing with the SM Higgs

Clarke

Foot

Volkas

2014

J. High Energ. Phys.

148

161

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In this paper we investigate the phenomenology of a very light scalar, h, with mass 100 MeV < m h < 10 GeV, mixing with the SM Higgs. As a benchmark model we take the real singlet scalar extension of the SM. We point out apparently unresolved uncertainties in the branching ratios and lifetime of h in a crucial region of parameter space for LHC phenomenology. Bounds from LEP, meson decays and fixed target experiments are reviewed. We also examine prospects at the LHC. For m h m B the dominant production mechanism is via meson decay; our main result is the calculation of the differential p T spectrum of h scalars originating from B mesons and the subsequent prediction of up to thousands of moderate (triggerable) p T displaced dimuons possibly hiding in the existing dataset at ATLAS/CMS or at LHCb. We also demonstrate that the subdominant V h production channel has the best sensitivity for m h m B and that future bounds in this region could conceivably compete with those of LEP.

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“…[59] it was argued that important constraints on Higgs-like pseudoscalars can be obtained in beam dump experiments. The most sensitive one is the CHARM search for axions [63]. Using Eq.…”

Section: Other Phenomenological Constraintsmentioning

confidence: 99%

The NMSSM lives: with the 750 GeV diphoton excess

et al. 2016

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We propose an NMSSM scenario that can explain the excess in the diphoton spectrum at 750 GeV recently observed by ATLAS and CMS. We show that in a certain limit with a very light pseudoscalar one can reproduce the experimental results without invoking exotic matter. The 750 GeV excess is produced by two resonant heavy Higgs bosons with masses ∼750 GeV, which subsequently decay to two light pseudoscalars. Each of these decays to collimated photon pairs that appear as a single photon in the electromagnetic calorimeter. A mass gap between heavy Higgses mimics a large width of the 750 GeV peak. The production mechanism, containing a strong component via initial b quarks, ameliorates a possible tension with 8 TeV data compared to other production modes. We also discuss other constraints, in particular from low-energy experiments. Finally, we discuss possible methods that could distinguish our proposal from other physics models describing the diphoton excess in the Run-II of the LHC.

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Search for axion-like particle production in 400 GeV proton-copper interactions

Cited by 303 publications

References 9 publications

Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Phenomenology of a very light scalar (100 MeV < m h < 10 GeV) mixing with the SM Higgs

The NMSSM lives: with the 750 GeV diphoton excess

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