Model-independent bounds on light pseudoscalars from rare B-meson decays

Döbrich, Babette; Kahlhoefer, Felix; Ertas, Fatih; Spadaro, T.

doi:10.1016/j.physletb.2019.01.064

Cited by 61 publications

(64 citation statements)

References 75 publications

(127 reference statements)

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“…A recent study[61] on ALPs coupled to fermions is another example of the importance of carefully recasting results from past experiments, particularly CHARM, using PYTHIA and MC simulations to appreciate their full impact.…”

mentioning

confidence: 99%

Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps

Döbrich

Jaeckel

Spadaro

2019

J. High Energ. Phys.

Self Cite

108

134

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The exploration of long-lived particles in the MeV-GeV region is a formidable task but it may provide us a unique access to dark sectors. Fixed-target facilities with sufficiently energetic and intense proton beams are an ideal tool for this challenge. In this work we show that the production rate of Axion-Like-Particles (ALPs) coupled pre-dominantly to photons receives a significant contribution from daughter-photons of secondary π 0 and η mesons created in the proton shower. We carefully compare the PYTHIA simulated spectra of such secondaries to experimental literature, compute the ALP flux from the Primakoff conversion of these photons, and finally revisit existing limits on ALPs and update the prospects for a set of existing and future searches. Our results show that taking this production mechanism into account significantly enhances the sensitivity compared to previous studies based on coherent ALP production in primary proton-nucleus interactions.

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mentioning

confidence: 99%

Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps

Döbrich

Jaeckel

Spadaro

2019

J. High Energ. Phys.

Self Cite

108

134

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“…A recent discussion of this model and its properties can be found, e.g., in Refs. [95,96], while FASER's reach has also been presented in Ref. [36].…”

Section: A Benchmark P1: Pseudoscalar With Yukawa-like Couplingsmentioning

confidence: 97%

“…The pseudoscalar model has been investigated, e.g., in Refs. [95,96], and FASER's reach will be presented below in Sec. VIII.…”

Section: B Benchmark A2: Fermion Dominancementioning

confidence: 99%

FASER’s physics reach for long-lived particles

Ariga¹,

Ariga²,

Boyd³

et al. 2019

Phys. Rev. D

304

330

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FASER, the ForwArd Search ExpeRiment, is an approved experiment dedicated to searching for light, extremely weakly-interacting particles at the LHC. Such particles may be produced in the LHC's high-energy collisions and travel long distances through concrete and rock without interacting. They may then decay to visible particles in FASER, which is placed 480 m downstream of the ATLAS interaction point. In this work we briefly describe the FASER detector layout and the status of potential backgrounds. We then present the sensitivity reach for FASER for a large number of long-lived particle models, updating previous results to a uniform set of detector assumptions, and analyzing new models. In particular, we consider all of the renormalizable portal interactions, leading to dark photons, dark Higgs bosons, and heavy neutral leptons (HNLs); light B−L and L i −L j gauge bosons; axion-like particles (ALPs) that are coupled dominantly to photons, fermions, and gluons through non-renormalizable operators; and pseudoscalars with Yukawa-like couplings. We find that FASER and its follow-up, FASER 2, have a full physics program, with discovery sensitivity in all of these models and potentially far-reaching implications for particle physics and cosmology.

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“…Current bounds (filled areas) and mediumfar (∼ 10-15 years) prospects for PBC projects (solid lines) for ALPs with fermion coupling. CHARM and LHCb filled areas have been adapted to PBC prescriptions by F. Kahlhoefer, following Ref [319]…”

mentioning

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.

451

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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Model-independent bounds on light pseudoscalars from rare B-meson decays

Cited by 61 publications

References 75 publications

Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps

Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps

FASER’s physics reach for long-lived particles

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

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