KLEVER: An experiment to measure BR($K_L \rightarrow \pi^0\nu\bar{\nu}$) at the CERN SPS

Moulson, M.; Klever,

doi:10.22323/1.340.0529

Cited by 7 publications

(10 citation statements)

References 18 publications

(19 reference statements)

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“…See also e.g., refs. [3,64,100,101] for further proposals to probe Higgs portal scalars in this mass range. 8 We observe that DarkQuest Phase I has the potential to cover a significant region of unexplored parameter space for scalar masses between about 200 MeV and 2 GeV.…”

Section: Darkquest Sensitivity To Dark Scalarsmentioning

confidence: 99%

Dark scalars and heavy neutral leptons at DarkQuest

Batell

Evans

Gori

et al. 2021

J. High Energ. Phys.

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The proposed DarkQuest beam dump experiment, a modest upgrade to the existing SeaQuest/SpinQuest experiment, has great potential for uncovering new physics within a dark sector. We explore both the near-term and long-term prospects for observing two distinct, highly-motivated hidden sector benchmark models: heavy neutral leptons and Higgs-mixed scalars. We comprehensively examine the particle production and detector acceptance at DarkQuest, including an updated treatment of meson production, and light scalar production through both bremsstrahlung and gluon-gluon fusion. In both benchmark models, DarkQuest will provide an opportunity to probe previously inaccessible interesting regions of parameter space on a fairly short timescale when compared to other proposed experiments.

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Section: Darkquest Sensitivity To Dark Scalarsmentioning

confidence: 99%

Dark scalars and heavy neutral leptons at DarkQuest

Batell

Evans

Gori

et al. 2021

J. High Energ. Phys.

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“…Se aQ ue st CHARM [183], NA62 [184], FASER-I&II [162,[185][186][187], FCC-hh [188,189], ATLAS [190][191][192][193], SeaQuest [194], LHCb [195], KLEVER [196], DUNE [197,198], DarkQuest-Phase2 [199], MATH-USLA [108], SHiP [200] and PS191 [201,202].…”

Section: Laboratory Probe For Non-standard Cosmologymentioning

confidence: 99%

“…The thick straight dashed lines (parallel to the horizontal axis) with different colours show the DM parameter space complying with the PLANCK observed relic abundance and satisfying spinindependent direct search exclusion limit in sin θ − m h2 plane for n = {0, 1, 2, 3} from bottom to top with T R = 5 GeV (left) and T R = 20 MeV (right). Experimental limits are shown from E949[182], CHARM[183], NA62[184], FASER-I&II[162,[185][186][187], FCC-hh[188,189], ATLAS[190][191][192][193], SeaQuest[194], LHCb[195], KLEVER[196], DUNE[197,198], DarkQuest-Phase2[199], MATH-USLA[108], SHiP[200] and PS191[201,202].…”

mentioning

confidence: 99%

Probing pre-BBN era with Scale Invarint FIMP

Barman¹,

Ghoshal²

2022

Preprint

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Detecting dark matter (DM) relic via freeze-in is difficult in laboratories due to smallness of the couplings involved. However, a non-standard cosmological history of the Universe, prior to Big Bang Nucleosynthesis (BBN), can dramatically change this scenario. In this context, we study the freeze-in production of dark matter (DM) in classically scale invariant U (1) X gauge extension of the Standard Model (SM), recently dubbed as the Scale Invariant FIMP Miracle. We assume an additional species dominates the energy density of the Universe at early times, causing the expansion rate at a given temperature to be larger than that in the standard radiation-dominated case. We find, the out-of-equilibrium scattering processes involving particles in the thermal bath lead to significantly suppressed DM production in this era, thereby enhancing the couplings between the visible and the dark sector (by several orders of magnitude) to satisfy the observed DM abundance, and improving the detection prospects for freeze-in in turn. Scale invariance of the underlying theory leaves only four free parameters in the model: the DM mass m X , the gauge coupling g X , the temperature of transition T R from early scalar-dominated to radiation-dominated era and the power-law dependence n of this temperature. We show, within this minimal set-up, experiments like FASER, MATHUSLA, DUNE, SHiP will be probing various cosmological models depending on the choice of {n, T R } that also satisfy the PLANCK observed relic density bound. Moreover, due to the presence of a naturally light scalar mediator, the direct detection of the DM at XENON1T, PandaX-4T or XENONnT becomes relevant for Higgsscalar mixing sin θ {10 −5 − 10 −3 }, thus providing complementary probes for freeze-in, as well as for non-standard cosmological pre-BBN era.

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“…KLEVER [193], DUNE [117,118], DarkQuest-Phase2 [125], MATHUSLA [126], SHiP [127] and PS191 [123,124]. All proposed experimental limits are denoted by dashed curves, while the existing limits are in solid.…”

Section: Figmentioning

confidence: 99%

Scale Invariant FIMP Miracle

Barman,

Ghoshal

2021

Preprint

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We study the freeze-in production of vector dark matter (DM) in a classically scale invariant theory, where the Standard Model (SM) is augmented with an abelian U (1) X gauge symmetry that is spontaneously broken due to the non-zero vacuum expectation value (VEV) of a scalar charged under the U (1) X . Generating the SM Higgs mass at 1-loop level, it leaves only two parameters in the dark sector, namely, the DM mass m X and the gauge coupling g X as independent, and supplement with a naturally light dark scalar particle. We show, for g X ∼ O 10 −5 , it is possible to produce the DM X out-of-equilibrium in the early Universe, satisfying the observed relic abundance for m X ∼ O (TeV), which in turn also determines the scalar mixing angle sin θ ∼ O 10 −5 . The presence of such naturally light scalar mediator with tiny mixing with the SM, opens up the possibility for the model to be explored in direct search experiment, which otherwise is insensitive to standard freeze-in scenarios. Moreover we show that even with such feeble couplings, necessary for the DM freeze-in, the scenario is testable in several light dark sector searches (e.g., in DUNE and in FASER-II), satisfying constraints from the observed relic abundance as well as big bang nucleosynthesis (BBN). Particularly, we find, regions of the parameter space with m X 1.8 TeV are insensitive to direct detection probes but still can become accessible in lifetime frontier searches, courtesy to the underlying scale invariance of the theory.

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KLEVER: An experiment to measure BR($K_L \rightarrow \pi^0\nu\bar{\nu}$) at the CERN SPS

Cited by 7 publications

References 18 publications

Dark scalars and heavy neutral leptons at DarkQuest

Dark scalars and heavy neutral leptons at DarkQuest

Probing pre-BBN era with Scale Invarint FIMP

Scale Invariant FIMP Miracle

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