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Title: Mass measurement using energy spectra in three-body decays

Abstract

In previous works we have demonstrated how the energy distribution of massless decay products in two body decays can be used to measure the mass of decaying particles. In this study, we show how such results can be generalized to the case of multi-body decays. The key ideas that allow us to deal with multi-body final states are an extension of our previous results to the case of massive decay products and the factorization of the multi-body phase space. The mass measurement strategy that we propose is distinct from alternative methods because it does not require an accurate reconstruction of the entire event, as it does not involve, for instance, the missing transverse momentum, but rather requires measuring only the visible decay products of the decay of interest. To demonstrate the general strategy, we study a supersymmetric model wherein pair-produced gluinos each decay to a stable neutralino and a bottom quark-antiquark pair via an off -shell bottom squark. The combinatorial background stemming from the indistinguishable visible final states on both decay sides can be treated by an “event mixing” technique, the performance of which is discussed in detail. In conclusion, taking into account dominant backgrounds, we are able to showmore » that the mass of the gluino and, in favorable cases, that of the neutralino can be determined by this mass measurement strategy.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Maryland, College Park, MD (United States); CERN Physics Department, Geneva (Switzerland)
  3. Univ. of Maryland, College Park, MD (United States); Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1327015
Grant/Contract Number:  
FG02-97ER41029
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: 2016; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Deep Inelastic Scattering (Phenomenology); Supersymmetry Phenomenology

Citation Formats

Agashe, Kaustubh, Franceschini, Roberto, Kim, Doojin, and Wardlow, Kyle. Mass measurement using energy spectra in three-body decays. United States: N. p., 2016. Web. doi:10.1007/JHEP05(2016)138.
Agashe, Kaustubh, Franceschini, Roberto, Kim, Doojin, & Wardlow, Kyle. Mass measurement using energy spectra in three-body decays. United States. doi:10.1007/JHEP05(2016)138.
Agashe, Kaustubh, Franceschini, Roberto, Kim, Doojin, and Wardlow, Kyle. Tue . "Mass measurement using energy spectra in three-body decays". United States. doi:10.1007/JHEP05(2016)138. https://www.osti.gov/servlets/purl/1327015.
@article{osti_1327015,
title = {Mass measurement using energy spectra in three-body decays},
author = {Agashe, Kaustubh and Franceschini, Roberto and Kim, Doojin and Wardlow, Kyle},
abstractNote = {In previous works we have demonstrated how the energy distribution of massless decay products in two body decays can be used to measure the mass of decaying particles. In this study, we show how such results can be generalized to the case of multi-body decays. The key ideas that allow us to deal with multi-body final states are an extension of our previous results to the case of massive decay products and the factorization of the multi-body phase space. The mass measurement strategy that we propose is distinct from alternative methods because it does not require an accurate reconstruction of the entire event, as it does not involve, for instance, the missing transverse momentum, but rather requires measuring only the visible decay products of the decay of interest. To demonstrate the general strategy, we study a supersymmetric model wherein pair-produced gluinos each decay to a stable neutralino and a bottom quark-antiquark pair via an off -shell bottom squark. The combinatorial background stemming from the indistinguishable visible final states on both decay sides can be treated by an “event mixing” technique, the performance of which is discussed in detail. In conclusion, taking into account dominant backgrounds, we are able to show that the mass of the gluino and, in favorable cases, that of the neutralino can be determined by this mass measurement strategy.},
doi = {10.1007/JHEP05(2016)138},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2016,
place = {United States},
year = {2016},
month = {5}
}

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Cited by: 7 works
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