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Title: Detecting kinematic boundary surfaces in phase space: particle mass measurements in SUSY-like events

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3];  [4];  [1];  [3]
  1. Univ. of Florida, Gainesville, FL (United States). Physics Dept.
  2. Univ. of Hawaii, Honolulu, HI (United States). Dept. of Physics and Astronomy
  3. Univ. of Texas, Austin, TX (United States). Theory Group. Dept. of Physics. Texas Cosmology Center
  4. Univ. of Florida, Gainesville, FL (United States). Physics Dept.; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Division
+ Show Author Affiliations

We critically examine the classic endpoint method for particle mass determination, focusing on difficult corners of parameter space, where some of the measurements are not independent, while others are adversely affected by the experimental resolution. In such scenarios, mass differences can be measured relatively well, but the overall mass scale remains poorly constrained. Using the example of the standard SUSY decay chain q~→χ~02→ℓ~→χ~01 , we demonstrate that sensitivity to the remaining mass scale parameter can be recovered by measuring the two-dimensional kinematical boundary in the relevant three-dimensional phase space of invariant masses squared. We develop an algorithm for detecting this boundary, which uses the geometric properties of the Voronoi tessellation of the data, and in particular, the relative standard deviation (RSD) of the volumes of the neighbors for each Voronoi cell in the tessellation. We propose a new observable, Σ¯ , which is the average RSD per unit area, calculated over the hypothesized boundary. We show that the location of the Σ¯ maximum correlates very well with the true values of the new particle masses. Our approach represents the natural extension of the one-dimensional kinematic endpoint method to the relevant three dimensions of invariant mass phase space.

Research Organization:
Univ. of Florida, Gainesville, FL (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Korean Research Foundation (KRF)
Grant/Contract Number:
SC0010296; SC0010504; PHY-1620610; PHY-0969510
OSTI ID:
1424610
Journal Information:
Journal of High Energy Physics (Online), Vol. 2017, Issue 6; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (3)

Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable journal May 2019
Kinematic focus point method for particle mass measurements in missing energy events journal October 2019
Dreaming awake: disentangling the underlying physics in case of a SUSY-like discovery at the LHC journal September 2019

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
supersymmetry
phenomenology