Direct photon production from pions and protons at 200 GeV/c

Badier, J.; Bardadin-Otwinowska, M.; Bemporad, C.; Berthon, U.; Bienvenu, H.; Boucrot, J.; Bourotte, J.; Burgun, G.; Callot, O.; Charpentier, Ph.; Cnops, A.M.; Cohen, Marvin L.; Constantini, F.; Crozon, M.; Décamp, D.; Delpierre, P.; Detoeuf, J. F.; Espigat, P.; Gandois, B.; Giannini, G.; Hajjar, V.; Hansroul, M.; Karyotakis, Y.; Lariccia, P.; Dû, P. Le; Mas, Javier; Michelini, A.; Moneti, G. C.; Moniez, M.; Paré, E.; Rahal-Callot, G.; Rumpf, M.; Runólfsson, Ö.; Tilquin, A.; Weisz, S.

doi:10.1007/bf01588030

Cited by 55 publications

(13 citation statements)

References 15 publications

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“…Strong constraints on couplings for HNLs with masses below the kaon mass are set by past experiments, in particular PS191 [268], CHARM [269], NuTeV [270], E949 [271], PIENU [272], TRIUMF-248 [273] and NA3 [274]. An interesting search has been also performed recently by the NA62 collaboration [275].…”

Section: Current Bounds On Hnls: General Considerationsmentioning

confidence: 99%

Physics beyond colliders at CERN: beyond the Standard Model working group report

Beacham

Burrage

Curtin

et al. 2019

J. Phys. G: Nucl. Part. Phys.

486

628

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The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of the CERN's accelerator complex and scientific infrastructures through projects complementary to the LHC and other possible future colliders. These projects will target fundamental physics questions in modern particle physics.ii 7 Physics reach of PBC projects 66 8 Physics reach of PBC projects in the sub-eV mass range 66 8.1 Axion portal with photon dominance (BC9) 66 9 Physics reach of PBC projects in the MeV-GeV mass range 73 9.1 Vector Portal 78 9.1.1 Minimal Dark Photon model (BC1) 78 9.1.2 Dark Photon decaying to invisible final states (BC2) 83 9.1.3 Milli-charged particles (BC3) 90 9.2 Scalar Portal 93 9.2.1 Dark scalar mixing with the Higgs (BC4 and BC5) 93 9.3 Neutrino Portal 97 9.3.1 Neutrino portal with electron-flavor dominance (BC6) 98 9.3.2 Neutrino portal with muon-flavor dominance (BC7) 101 9.3.3 Neutrino portal with tau-flavor dominance (BC8) 103 9.4 Axion Portal 106 9.4.1 Axion portal with photon-coupling (BC9) 106 9.4.2 Axion portal with fermion-coupling (BC10) 110 9.4.3 Axion portal with gluon-coupling (BC11) 113 10 Physics reach of PBC projects in the multi-TeV mass range 115 10.1 Measurement of EDMs as probe of NP in the multi TeV scale 115 10.2 Experiments sensitive to Flavour Violation 116 10.3 B physics anomalies and BR(K → πνν) 120 11 Conclusions and Outlook 121 A ALPS: prescription for treating the FCNC processes 123 B ALPs: production via π 0 , η, η mixing 126 Executive SummaryThe main goal of this document follows very closely the mandate of the Physics Beyond Colliders (PBC) study group, and is "an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its scientific infrastructure through projects complementary to the LHC, HL-LHC and other possible future colliders. These projects would target fundamental physics questions that are similar in spirit to those addressed by high-energy colliders, but that require different types of beams and experiments 1 ". Fundamental questions in modern particle physics as the origin of the neutrino masses and oscillations, the nature of Dark Matter and the explanation of the mechanism that drives the baryogenesis are still open today and do require an answer.So far an unambiguous signal of New Physics (NP) from direct searches at the Large Hadron Collider (LHC), indirect searches in flavour physics and direct detection Dark Matter experiments is absent. Moreover, theory provides no clear guidance on the NP scale. This imposes today, more than ever, a broadening of the experimental effort in the quest for NP. We need to explore different ranges of interaction strengths and masses with respect to what is already covered by existing or planned initiatives.Low-mass and very-weakly coupled particles represent an attractive possibility, theoretically and phenomenologically well motivated, but currently poorly explored: a systematic investigation should be pursued in the next decades both at acc...

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Section: Current Bounds On Hnls: General Considerationsmentioning

confidence: 99%

Physics beyond colliders at CERN: beyond the Standard Model working group report

Beacham

Burrage

Curtin

et al. 2019

J. Phys. G: Nucl. Part. Phys.

486

628

View full text Add to dashboard Cite

show abstract

“…The current 90% C.L. limits from some of these beam dump experiments, such as PS191 [191], NA3 [192], CHARM [193][194][195], IHEP-JINR [196], BEBC [197], FMMF [198], NuTeV [199] and NOMAD [200] are shown in figures 3-5. It may be noted here that the PS191 [191] and CHARM [193] limits shown here assume that the sterile neutrinos interact only via CC.…”

Section: Beam Dump Experimentsmentioning

confidence: 99%

Neutrinos and collider physics

2015

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We review the collider phenomenology of neutrino physics and the synergetic aspects at energy, intensity and cosmic frontiers to test the new physics behind the neutrino mass mechanism. In particular, we focus on seesaw models within the minimal setup as well as with extended gauge and/or Higgs sectors, and on supersymmetric neutrino mass models with seesaw mechanism and with Rparity violation. In the simplest type-I seesaw scenario with sterile neutrinos, we summarize and update the current experimental constraints on the sterile neutrino mass and its mixing with the active neutrinos. We also discuss the future experimental prospects of testing the seesaw mechanism at colliders and in related low-energy searches for rare processes, such as lepton flavor violation and neutrinoless double beta decay. The implications of the discovery of lepton number violation at the Large Hadron Collider for leptogenesis are also studied.

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“…Other bounds of this type can be found in refs. [62][63][64][65][66][67][68] as well as collider ones, from LHCb [69], ATLAS [70], CMS [71,72], BELLE [73] (see also ref. [74]).…”

Section: Contentsmentioning

confidence: 99%

Heavy Neutral Leptons from low-scale seesaws at the DUNE Near Detector

Ballett

Boschi

Pascoli

2020

J. High Energ. Phys.

113

142

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Heavy nearly-sterile neutrinos are a common ingredient in extensions of the Standard Model which aim to explain neutrino masses, like for instance in Type I seesaw models, or one of its variants. If the scale of the new Heavy Neutral Leptons (HNLs) is sufficiently low, observable signatures can arise in a range of current and upcoming experiments, from the LHC to neutrino experiments. In this article, we discuss the phenomenology of sterile neutrinos in the MeV to GeV mass range, focusing on their decays. We embed our discussion in a realistic mass model and consider the resulting implications. We focus in particular on the impact on the signal of the strong polarisation effects in the beam for Majorana and (pseudo-)Dirac states, providing formulae to incorporate these in both production and decay. We study how the Near Detector of the upcoming Deep Underground Neutrino Experiment can constrain HNL states by searching for their decay products inside the detector. We conduct a Monte Carlo background analysis for the most promising signatures, incorporating the detector's particle identification capabilities, and estimate the experimental sensitivity of DUNE to these particles. We also present an estimate of the ν τ -derived HNL flux at DUNE, currently missing in the literature, which allows us to discuss searches for HNLs at higher masses.The evidence for three neutrino flavour oscillation is well established [1,2] and can be accounted for only if neutrino mass splittings are non zero [3]. This implies that neutrinos are massive and mix, forcing to consider extensions of the Standard Model (SM) to explain their origin. A simple means of doing so is to introduce the right-handed counterpart of SM neutrinos, which are singlet with respect to all SM gauge symmetries. The Lagrangian includes a Yukawa coupling between these sterile states, the Higgs boson and the leptonic doublet, which generates Dirac mass-terms below the scale of Electroweak Symmetry Breaking (EWSB), and Majorana mass terms for the new singlet states. On diagonalisation of the resulting neutrino mass matrix, the heavy neutrino states, commonly known as nearlysterile neutrinos or Heavy Neutral Leptons (HNLs) in experimental contexts, remain mainly in the sterile neutrino direction and have sub-weak interactions suppressed by elements of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix.These states have been connected to a vast range of phenomenological behaviours and even to cosmological implications (for a recent review on sterile neutrinos, see e.g. ref.[4]). For instance, nearly-sterile neutrinos in the keV region are viable warm Dark Matter candidates (see e.g. ref.[5]), whereas heavier HNLs could play a role in leptogenesis [6][7][8][9][10][11][12][13][14][15][16][17][18]. So far, some possible hints in favour of heavy neutrinos have emerged in neutrino appearance oscillation experiments, specifically LSND [19] and MiniBooNE [20][21][22] but are disfavoured by disappearance experiments [23][24][25], unless non-standard effects ar...

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Direct photon production from pions and protons at 200 GeV/c

Cited by 55 publications

References 15 publications

Physics beyond colliders at CERN: beyond the Standard Model working group report

Physics beyond colliders at CERN: beyond the Standard Model working group report

Neutrinos and collider physics

Heavy Neutral Leptons from low-scale seesaws at the DUNE Near Detector

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