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Title: How to prove that a E T excess at the LHC is not due to dark matter

Abstract

If the LHC is able to produce dark matter particles, they would appear at the end of cascade decay chains, manifesting themselves as missing transverse energy. However, such “dark matter candidates” may themselves decay invisibly. We propose to test for this possibility by studying the effect of particle widths on the observable invariant mass distributions of the visible particles seen in the detector. We consider the simplest nontrivial case of a two-step two-body cascade decay and derive analytically the shapes of the invariant mass distributions, for generic values of the widths of the new particles. We demonstrate that the resulting distortion in the shape of the invariant mass distribution can be significant enough to measure the width of the dark matter “candidate,” ruling it out as the source of the cosmological dark matter.

Authors:
 [1];  [2]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1470792
Alternate Identifier(s):
OSTI ID: 1501640
Grant/Contract Number:  
SC0010296
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Kim, Doojin, and Matchev, Konstantin T. How to prove that a ET excess at the LHC is not due to dark matter. United States: N. p., 2018. Web. doi:10.1103/physrevd.98.055018.
Kim, Doojin, & Matchev, Konstantin T. How to prove that a ET excess at the LHC is not due to dark matter. United States. doi:10.1103/physrevd.98.055018.
Kim, Doojin, and Matchev, Konstantin T. Fri . "How to prove that a ET excess at the LHC is not due to dark matter". United States. doi:10.1103/physrevd.98.055018.
@article{osti_1470792,
title = {How to prove that a ET excess at the LHC is not due to dark matter},
author = {Kim, Doojin and Matchev, Konstantin T.},
abstractNote = {If the LHC is able to produce dark matter particles, they would appear at the end of cascade decay chains, manifesting themselves as missing transverse energy. However, such “dark matter candidates” may themselves decay invisibly. We propose to test for this possibility by studying the effect of particle widths on the observable invariant mass distributions of the visible particles seen in the detector. We consider the simplest nontrivial case of a two-step two-body cascade decay and derive analytically the shapes of the invariant mass distributions, for generic values of the widths of the new particles. We demonstrate that the resulting distortion in the shape of the invariant mass distribution can be significant enough to measure the width of the dark matter “candidate,” ruling it out as the source of the cosmological dark matter.},
doi = {10.1103/physrevd.98.055018},
journal = {Physical Review D},
issn = {2470-0010},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/physrevd.98.055018

Figures / Tables:

FIG. 1. FIG. 1. : The new physics decay chain under study.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.