Title: Forecasting dark showers at Belle II

Abstract

Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at e⁺e^- colliders. In this work, we study the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. We show that a prospective search for displaced vertices from GeV-scale long-lived particles at Belle II can improve the sensitivity to dark showers substantially compared to an existing search at BaBar. We compare the sensitivity of searches for displaced signals to searches for promptly produced resonances at BaBar and KLOE and calculate sensitivity projections for a single-photon search at Belle II to invisible dark showers produced through an effective interaction. The underlying structure of the effective interaction can be resolved at higher-energy experiments, where the mediator can be produced on-shell. To study the resulting constraints, we update electroweak precision bounds on kinetically mixed Z' bosons and reinterpret a search for low-mass di-muon resonances at LHCb in terms of dark showers. We find that LHCb and Belle II are most sensitive to different particle decay lengths, underscoring the complementarity of LHC and intensity frontier experiments.

Authors:

Bernreuther, Elias  ^[1];

• Search DOE PAGES for author "Bernreuther, Elias"
• Search DOE PAGES for ORCID "0000-0002-4157-5586"

Böse, Kai ^[2]; Ferber, Torben  ^[3];

• Search DOE PAGES for author "Ferber, Torben"
• Search DOE PAGES for ORCID "0000-0002-6849-0427"

Hearty, Christopher  ^[4];

• Search DOE PAGES for author "Hearty, Christopher"
• Search DOE PAGES for ORCID "0000-0001-6568-0252"

Kahlhoefer, Felix  ^[5];

• Search DOE PAGES for author "Kahlhoefer, Felix"
• Search DOE PAGES for ORCID "0000-0002-2613-8679"

Morandini, Alessandro  ^[2];

• Search DOE PAGES for author "Morandini, Alessandro"
• Search DOE PAGES for ORCID "0000-0003-2301-7553"

Schmidt-Hoberg, Kai  ^[6]

• Search DOE PAGES for author "Schmidt-Hoberg, Kai"
• Search DOE PAGES for ORCID "0000-0002-9851-9091"

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+ Show Author Affiliations

1. RWTH Aachen University (Germany); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
2. RWTH Aachen University (Germany)
3. Karlsruhe Institute of Technology (KIT) (Germany)
4. University of British Columbia, Vancouver, BC (Canada); University of Victoria, BC (Canada)
5. RWTH Aachen University (Germany); Karlsruhe Institute of Technology (KIT) (Germany)
6. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

Publication Date:

Thu Dec 01 00:00:00 EST 2022

Research Org.:

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP); German Research Foundation (DFG); Helmholtz (HGF) Young Investigators Grant; Natural Sciences and Engineering Research Council of Canada (NSERC)

OSTI Identifier:

1861829

Report Number(s):

P3H-22-033; TTK-22-12; FERMILAB-PUB-22-140-T; TTP22-019; DESY-22-047; arXiv:2203.08824
Journal ID: ISSN 1029-8479; oai:inspirehep.net:2054069; TRN: US2305496

Grant/Contract Number:  

AC02-07CH11359; 396021762; KA 4662/1-1; 390833306; VH-NG-1303

Resource Type:

Accepted Manuscript

Journal Name:

Journal of High Energy Physics (Online)

Additional Journal Information:

Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2022; Journal Issue: 12; Journal ID: ISSN 1029-8479

Publisher:

Springer Nature

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; dark matter at colliders, new light particles