Mass and lifetime limits on new long-lived particles in 300 GeV/c π− interactions

Badier, J.; Bemporad, C.; Cnops, A.M.; Giannini, G.; Lariccia, P.; Boucrot, J.; Callot, O.; Walker, J.K.; Charpentier, Ph.; Detoeuf, J. F.; Crozon, M.; Delpierre, P.; Mas, Javier; Hammarstroem, R.; Lorenzi, Roberto; Michelini, A.; Tilquin, A.

doi:10.1007/bf01559588

Cited by 54 publications

(25 citation statements)

References 41 publications

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“…[83][84][85][86][87]. These include fixed target neutrino experiments, which have recently been considered as possibilities to probe GeV-scale portals [see e.g.…”

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.

150

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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“…[83][84][85][86][87]. These include fixed target neutrino experiments, which have recently been considered as possibilities to probe GeV-scale portals [see e.g.…”

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.

150

161

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“…For m H in the range (100 MeV-100 GeV) the limits jU eH j 2 ð10 À8 -10 À3 Þ were obtained in NA3 [32], CHARM [31], L3 [33], DELPHI [34] and Belle [35] experiments. Similar limits for sterile neutrino mixing with muon neutrino U H can be found in [36].…”

Section: B the Obtained Limitsmentioning

confidence: 96%

“…For larger neutrino masses, new decay channels open up which include kaons, eta, etc. [31][32][33][34][35]. Accelerator experiments with beam of neutrinos from and K decays constrain the coupling of still heavier neutrinos (see [36,37], and references therein).…”

Section: Introductionmentioning

confidence: 99%

New limits on heavy sterile neutrino mixing inB8decay obtained with the Borexino detector

Bellini¹,

Benziger²,

Bick³

et al. 2013

Phys. Rev. D

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If heavy neutrinos with mass m H ! 2m e are produced in the Sun via the decay 8 B ! 8 Be þ e þ þ H in a side branch of the pp chain, they would undergo the observable decay into an electron, a positron and a light neutrino H ! L þ e þ þ e À . In the present work Borexino data are used to set a bound on the existence of such decays. We constrain the mixing of a heavy neutrino with mass 1:5 MeV m H 14 MeV to be jU eH j 2 ð10 À3 À 4 Â 10 À6 Þ, respectively. These are tighter limits on the mixing parameters than obtained in previous experiments at nuclear reactors and accelerators.

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“…Here we summarise the main constraints and detection prospects of the heavy neutrinos. The mixing of the sterile neutrinos with muon neutrinos provides the most sensitive avenue to test the additional neutrinos.Constraints from meson decay peak searches [80][81][82], beam dump experiments [83][84][85][86][87][88] and collider experiments [89][90][91] constrain |U µ4 | 2 , |U µ5 | 2 10 −5 for m 4 , m 5 between 10 −2 −10 1 GeV, for m 4 , m 5 around 0.2−0.5 GeV peak searches constrain the mixing angles down to |U µ4 | 2 , |U µ5 | 2 10 −8 . Current and future neutrino experiments can probe a large region of the parameter space as it has been shown in [53].…”

Section: Neutrino Masses and Mixingsmentioning

confidence: 99%

A testable hidden-sector model for Dark Matter and neutrino masses

Gehrlein

Pierre

2020

J. High Energ. Phys.

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We consider a minimal extension of the Standard Model with a hidden sector charged under a dark local U (1) gauge group, accounting simultaneously for light neutrino masses and the observed Dark Matter relic abundance. The model contains two copies of right-handed neutrinos which give rise to light neutrino-masses via an extended seesaw mechanism. The presence of a stable Dark-Matter candidate and a massless state naturally arise by requiring the simplest anomaly-free particle content without introducing any extra symmetries. We investigate the phenomenology of the hidden sector considering the U (1) breaking scale of the order of the electroweak scale. Confronting the thermal history of this hidden-sector model with existing and future constraints from collider, direct and indirect detection experiments provides various possibilities of probing the model in complementary ways as every particle of the dark sector plays a specific cosmological role. Across the identified viable parameter space, a large region predicts a sizable contribution to the effective relativistic degrees-of-freedom in the early Universe that allows to alleviate the recently reported tension between late and early measurements of the Hubble constant. Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM, Gauge SymmetryArXiv ePrint: 1912.06661 1 A similar model using a hidden sector and dark neutrinos to explain the MiniBooNE excess has been proposed in [55,56].2 Notice however that the sterile neutrino explanation for these anomalies is in strong tension with νµ disappearance searches [68,69].3 Alternatively, one can introduce 3 left-handed fermions with charge 1 which complexifies the neutrino sector without providing a DM candidate in the model.

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Mass and lifetime limits on new long-lived particles in 300 GeV/c π− interactions

Cited by 54 publications

References 41 publications

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

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

New limits on heavy sterile neutrino mixing inB8decay obtained with the Borexino detector

A testable hidden-sector model for Dark Matter and neutrino masses

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