Long-lived light neutralinos at Belle II

Dey, S.; Dib, Claudio O.; Helo, Juan Carlos; Nayak, M.; Neill, Nicolás A.; Soffer, A.; Wang, Zeren Simon

doi:10.1007/jhep02(2021)211

Cited by 18 publications

(17 citation statements)

References 88 publications

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“…We find that the projected sensitivities of our proposed searches can surpass the sensitivities for minimal dark photons or dark Higgs bosons. Our work also complements recent proposals for new, model-specific LLP searches at B-factories [29,30,[52][53][54].…”

Section: Jhep09(2021)154supporting

confidence: 63%

Multi-track displaced vertices at B-factories

Acevedo

Blackburn

Blinov

et al. 2021

J. High Energ. Phys.

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We propose a program at B-factories of inclusive, multi-track displaced vertex searches, which are expected to be low background and give excellent sensitivity to non-minimal hidden sectors. Multi-particle hidden sectors often include long-lived particles (LLPs) which result from approximate symmetries, and we classify the possible decays of GeV-scale LLPs in an effective field theory framework. Considering several LLP production modes, including dark photons and dark Higgs bosons, we study the sensitivity of LLP searches with different number of displaced vertices per event and track requirements per displaced vertex, showing that inclusive searches can have sensitivity to a large range of hidden sector models that are otherwise unconstrained by current or planned searches.

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Section: Jhep09(2021)154supporting

confidence: 63%

Multi-track displaced vertices at B-factories

Acevedo

Blackburn

Blinov

et al. 2021

J. High Energ. Phys.

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“…Following Refs. [55,56], we define the detector fiducial volume to be a cylinder of length −40 < z < 120 cm along the beam direction and maximal radius r < 80 cm in the transverse plane, excluding the radial region r < 1 cm in order to reject the promptly produced tracks. If a generated axion decays outside of the fiducial volume, its contribution to the efficiency is 0.…”

Section: Axion Decays: Displaced and Promptmentioning

confidence: 99%

Heavy QCD Axion at Belle II: Displaced and Prompt Signals

Bertholet,

Chakraborty,

Loladze

et al. 2021

Preprint

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The QCD axion is a well-motivated addition to the standard model to solve the strong CP problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as O(1) GeV, and the decay constant can be as low as O(100) GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the axions are expected to be produced via B → Ka. We find that a subsequent decay a → 3π with a displaced vertex leads to a unique signal with essentially no background, and that a dedicated search can explore the range O(1-10) TeV of decay-constant values. We also show that a → γγ can cover a significant portion of currently unexplored region of 150 ma 500 MeV.

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“…At colliders and B-factories, such long-lived light neutralinos can be produced in different channels, including decays of Z-bosons, mesons, τ leptons, and squarks (see refs. [77][78][79][80][81][82][83][84][85] for previous relevant studies). In this work, we focus on the s-channel Z-boson decay into a pair of light neutralinos.…”

Section: Jhep09(2021)026mentioning

confidence: 99%

Time-delayed electrons from neutral currents at the LHC

Cheung

Wang

2021

J. High Energ. Phys.

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We investigate long-lived particles (LLPs) produced in pair from neutral currents and decaying into a displaced electron plus two jets at the LHC, utilizing the proposed minimum ionizing particle timing detector at CMS. We study two benchmark models: the R-parity-violating supersymmetry with the lightest neutralinos being the lightest supersymmetric particle and two different U(1) extensions of the standard model with heavy neutral leptons (HNLs). The light neutralinos are produced from the standard model Z-boson decays via small Higgsino components, and the HNLs arise from decays of a heavy gauge boson, Z′. By simulating the signal processes at the HL-LHC with the center-of-mass energy $$ \sqrt{s} $$ s = 14 TeV and integrated luminosity of 3 ab−1, our analyses indicate that the search strategy based on a timing trigger and the final state kinematics has the potential to probe the parameter space that is complementary to other traditional LLP search strategies such as those based on the displaced vertex.

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Long-lived light neutralinos at Belle II

Cited by 18 publications

References 88 publications

Multi-track displaced vertices at B-factories

Multi-track displaced vertices at B-factories

Heavy QCD Axion at Belle II: Displaced and Prompt Signals

Time-delayed electrons from neutral currents at the LHC

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