Decays of a bino-like particle in the low-mass regime

We study a bino-like light neutralino ($$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 ) produced at the LHC from the decay of a scalar lepton ($$ \tilde{e}_L $$ e ~ L ) through the process pp →$$ \tilde{e}_L $$ e ~ L →$$ e{\overset{\sim }{\chi}}_1^0 $$ e χ ~ 1 0 in the context of R-parity-violating (RPV) supersymmetry where $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 is the lightest supersymmetric particle. For small masses and RPV couplings, the neutralino is naturally long-lived and its decay products can be identified as displaced tracks. Following existing searches, we propose a displaced-vertex search strategy for such a light neutralino with a single RPV coupling switched on, $$ {\lambda}_{111}^{\prime } $$ λ 111 ′ , in the mass range 10 GeV ≲ $$ {m}_{{\overset{\sim }{\chi}}_1^0} $$ m χ ~ 1 0 ≲ 230 GeV. We perform Monte Carlo simulations and conclude that at the high-luminosity LHC, the proposed search can probe values of $$ {\lambda}_{111}^{\prime } $$ λ 111 ′ down to two orders of magnitude smaller than current bounds and up to 40 times smaller than projected limits from monolepton searches.

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“…See ref. [30] for a recent study on the low-energy phenomenomology of a bino-like neutralino lighter than the tau lepton.…”

Section: Introductionmentioning

confidence: 99%

Searching for light neutralinos with a displaced vertex at the LHC

Cottin

Helo

Neill

et al. 2022

J. High Energ. Phys.

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“…They have been studied extensively for various present and future experiments including SHiP [59,60], ATLAS [59], far detectors at the LHC [61][62][63][64], Belle II [65], Super-Kamiokande [66], and future lepton colliders [67,68]. These works mostly consider the signature of a neutralino decay into a charged lepton plus a meson, induced by LQ D operators [69], while the production can result from decays of either mesons, τ leptons, or Z-boson.…”

Section: Jhep02(2023)120mentioning

confidence: 99%

“…The dominant decay mode of the neutralino is dictated by the relative sizes of the RPV couplings, as well as the neutralino mass [69]. For m χ0 1 O (4.5) GeV, the neutralino can decay into a meson and a lepton via an LQ D operator, if kinematically allowed.…”

Section: Neutralino Decaymentioning

confidence: 99%

Searching for a single photon from lightest neutralino decays in R-parity-violating supersymmetry at FASER

Dreiner¹,

Köhler²,

Nangia³

et al. 2023

J. High Energ. Phys.

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In this work, we propose a search for a single photon at FASER and FASER2, produced from decays of bino-like, sub-GeV lightest neutralinos in the theoretical framework of the R-parity-violating (RPV) Minimal Supersymmetric Standard Model (MSSM). We consider a list of representative benchmark scenarios with one or two non-vanishing RPV couplings. The photon has an energy 𝒪(0.1) − 𝒪(1) TeV. We find a sensitivity reach for RPV couplings beyond the current bounds by orders of magnitude at FASER and FASER2.

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“…1 can be as light as a GeV or even lighter [14][15][16][17][18][19][20][21][22][23], in which case its production in decays of τ lepton or heavy mesons is kinematically allowed. Such a light neutralino should be dominantly Bino according to current bounds [21][22][23][24][25]. In addition, it has to decay, e.g., via RPV couplings so as to avoid overclosing the Universe [26][27][28][29].…”

mentioning

confidence: 99%

“…We focus on the case in which only λ 113 or λ 123 is non-zero and there is no squark mixing. The decay of such a light neutralino is suppressed, so that it appears as missing energy at the detector level [25]. We propose to probe λ 113 via the decay mode B + → p χ0…”

mentioning

confidence: 99%

Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino

Dib¹,

Helo²,

Lyubovitskij³

et al. 2022

Preprint

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We propose a search for B meson decays to a proton or a hyperon plus missing energy at the Belle II experiment to probe supersymmetry with a GeV-scale lightest neutralino χ01 and R-parity violation (RPV). We perform analytic computations of the signal branching fractions in the framework of effective field theory, with a single nonzero RPV operator λ 1j3 Ū c 1 Dc j Dc 3 , where j = 1, 2. The hadronic form factors are calculated using an SU(3) phenomenological Lagrangian approach. Since the decay of the neutralino is kinematically and CKM suppressed in this theoretical scenario, it decays outside the detector and appears experimentally only as missing energy. We detail the analysis techniques at the experimental level and estimate the background in the B + → p χ01 search using published results for B + → K + ν ν. Our final sensitivity plots are shown for both λ 113 versus the squark mass m q and λ 113 /m 2 q versus the neutralino mass m χ0 1 . We find that the search at Belle II could probe λ 113 /m 2 q down to the order of 10 −8 GeV −2 in the kinematically allowed m χ0 1 range. We also obtain current limits on B 0 → Λ 0 χ0 1 by recasting an existing search, and comment about searches for B + → Σ + χ01 and B 0 → Σ 0 χ0 1 . In closing, we briefly discuss potential searches at the LHCb and BESIII experiments.

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Decays of a bino-like particle in the low-mass regime

Cited by 4 publications

References 68 publications

Searching for light neutralinos with a displaced vertex at the LHC

Searching for light neutralinos with a displaced vertex at the LHC

Searching for a single photon from lightest neutralino decays in R-parity-violating supersymmetry at FASER

Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino

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