skip to main content

DOE PAGESDOE PAGES

Title: Triggering soft bombs at the LHC

Very high multiplicity, spherically-symmetric distributions of soft particles, with p T ~ few×100 MeV, may be a signature of strongly-coupled hidden valleys that exhibit long, efficient showering windows. With traditional triggers, such ‘soft bomb’ events closely resemble pile-up and are therefore only recorded with minimum bias triggers at a very low efficiency. We demonstrate a proof-of-concept for a high-level triggering strategy that efficiently separates soft bombs from pile-up by searching for a ‘belt of fire’: a high density band of hits on the innermost layer of the tracker. Seeding our proposed high-level trigger with existing jet, missing transverse energy or lepton hardware-level triggers, we show that net trigger efficiencies of order 10% are possible for bombs of mass several × 100 GeV. We also consider the special case that soft bombs are the result of an exotic decay of the 125 GeV Higgs. The fiducial rate for ‘Higgs bombs’ triggered in this manner is marginally higher than the rate achievable by triggering directly on a hard muon from associated Higgs production.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physics Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physics Division
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physics Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of Cincinnati, OH (United States). Physics Dept.
Publication Date:
Grant/Contract Number:
AC02-05CH11231; PHY-1002399; PHY-1066293
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron scattering (experiments)
OSTI Identifier:
1417598

Knapen, Simon, Griso, Simone Pagan, Papucci, Michele, and Robinson, Dean J. Triggering soft bombs at the LHC. United States: N. p., Web. doi:10.1007/JHEP08(2017)076.
Knapen, Simon, Griso, Simone Pagan, Papucci, Michele, & Robinson, Dean J. Triggering soft bombs at the LHC. United States. doi:10.1007/JHEP08(2017)076.
Knapen, Simon, Griso, Simone Pagan, Papucci, Michele, and Robinson, Dean J. 2017. "Triggering soft bombs at the LHC". United States. doi:10.1007/JHEP08(2017)076. https://www.osti.gov/servlets/purl/1417598.
@article{osti_1417598,
title = {Triggering soft bombs at the LHC},
author = {Knapen, Simon and Griso, Simone Pagan and Papucci, Michele and Robinson, Dean J.},
abstractNote = {Very high multiplicity, spherically-symmetric distributions of soft particles, with p T ~ few×100 MeV, may be a signature of strongly-coupled hidden valleys that exhibit long, efficient showering windows. With traditional triggers, such ‘soft bomb’ events closely resemble pile-up and are therefore only recorded with minimum bias triggers at a very low efficiency. We demonstrate a proof-of-concept for a high-level triggering strategy that efficiently separates soft bombs from pile-up by searching for a ‘belt of fire’: a high density band of hits on the innermost layer of the tracker. Seeding our proposed high-level trigger with existing jet, missing transverse energy or lepton hardware-level triggers, we show that net trigger efficiencies of order 10% are possible for bombs of mass several × 100 GeV. We also consider the special case that soft bombs are the result of an exotic decay of the 125 GeV Higgs. The fiducial rate for ‘Higgs bombs’ triggered in this manner is marginally higher than the rate achievable by triggering directly on a hard muon from associated Higgs production.},
doi = {10.1007/JHEP08(2017)076},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2017,
place = {United States},
year = {2017},
month = {8}
}