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Title: Precision gluino mass at the CERN LHC in supersymmetric models with decoupled scalars

Abstract

One way to ameliorate the SUSY flavor and CP problems is to postulate that scalar masses lie in the TeV or beyond regime. For example, the focus point (FP) region of the minimal supergravity (mSUGRA) model is especially compelling in that heavy scalar masses can coexist with low fine-tuning while yielding the required relic abundance of cold dark matter (via a mixed Higgsino-bino neutralino). We examine many of the characteristics of collider events expected to arise at the CERN LHC in models with multi-TeV scalars, taking the mSUGRA FP region as a case study. The collider events are characterized by a hard component arising from gluino pair production, plus a soft component arising from direct chargino and neutralino production. Gluino decays in the FP region are characterized by lengthy cascades yielding very large jet and lepton multiplicities, and a large b-jet multiplicity. Thus, as one steps to higher jet, b-jet or lepton multiplicity, signal-over-background rates should steadily improve. The lengthy cascade decays make mass reconstruction via kinematic edges difficult; however, since the hard component is nearly pure gluino pair production, the gluino mass can be extracted to {+-}8% via total rate for E{sub T}{sup miss}+{>=}7-jet+{>=}2b-jet events, assuming 100 fb{sup -1}more » of integrated luminosity. The distribution of invariant mass of opposite-sign/same-flavor dileptons in the hard component exhibits two dilepton mass edges: m{sub Z-tilde{sub 2}}-m{sub Z-tilde{sub 1}} and m{sub Z-tilde{sub 3}}-m{sub Z-tilde{sub 1}}. As a consistency check, the same mass edges should be seen in isolated opposite-sign dileptons occurring in the soft component trilepton signal which originates mainly from chargino-neutralino production.« less

Authors:
 [1]; ;  [2];  [1];  [3]
  1. Dept. of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
  2. Dept. of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
  3. Department of Physics, Princeton University, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
21020511
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.095010; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; CERN LHC; DISTRIBUTION; FLAVOR MODEL; HARD COMPONENT; JET MODEL; LEPTONS; MULTIPLICITY; NONLUMINOUS MATTER; PAIR PRODUCTION; REST MASS; SCALARS; SOFT COMPONENT; SUPERGRAVITY; SUPERSYMMETRY; TEV RANGE

Citation Formats

Baer, Howard, Dept. of Physics, University of Wisconsin, Madison, Wisconsin 53706, Barger, Vernon, Shaughnessy, Gabe, Summy, Heaya, and Liantao, Wang. Precision gluino mass at the CERN LHC in supersymmetric models with decoupled scalars. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.095010.
Baer, Howard, Dept. of Physics, University of Wisconsin, Madison, Wisconsin 53706, Barger, Vernon, Shaughnessy, Gabe, Summy, Heaya, & Liantao, Wang. Precision gluino mass at the CERN LHC in supersymmetric models with decoupled scalars. United States. https://doi.org/10.1103/PHYSREVD.75.095010
Baer, Howard, Dept. of Physics, University of Wisconsin, Madison, Wisconsin 53706, Barger, Vernon, Shaughnessy, Gabe, Summy, Heaya, and Liantao, Wang. Tue . "Precision gluino mass at the CERN LHC in supersymmetric models with decoupled scalars". United States. https://doi.org/10.1103/PHYSREVD.75.095010.
@article{osti_21020511,
title = {Precision gluino mass at the CERN LHC in supersymmetric models with decoupled scalars},
author = {Baer, Howard and Dept. of Physics, University of Wisconsin, Madison, Wisconsin 53706 and Barger, Vernon and Shaughnessy, Gabe and Summy, Heaya and Liantao, Wang},
abstractNote = {One way to ameliorate the SUSY flavor and CP problems is to postulate that scalar masses lie in the TeV or beyond regime. For example, the focus point (FP) region of the minimal supergravity (mSUGRA) model is especially compelling in that heavy scalar masses can coexist with low fine-tuning while yielding the required relic abundance of cold dark matter (via a mixed Higgsino-bino neutralino). We examine many of the characteristics of collider events expected to arise at the CERN LHC in models with multi-TeV scalars, taking the mSUGRA FP region as a case study. The collider events are characterized by a hard component arising from gluino pair production, plus a soft component arising from direct chargino and neutralino production. Gluino decays in the FP region are characterized by lengthy cascades yielding very large jet and lepton multiplicities, and a large b-jet multiplicity. Thus, as one steps to higher jet, b-jet or lepton multiplicity, signal-over-background rates should steadily improve. The lengthy cascade decays make mass reconstruction via kinematic edges difficult; however, since the hard component is nearly pure gluino pair production, the gluino mass can be extracted to {+-}8% via total rate for E{sub T}{sup miss}+{>=}7-jet+{>=}2b-jet events, assuming 100 fb{sup -1} of integrated luminosity. The distribution of invariant mass of opposite-sign/same-flavor dileptons in the hard component exhibits two dilepton mass edges: m{sub Z-tilde{sub 2}}-m{sub Z-tilde{sub 1}} and m{sub Z-tilde{sub 3}}-m{sub Z-tilde{sub 1}}. As a consistency check, the same mass edges should be seen in isolated opposite-sign dileptons occurring in the soft component trilepton signal which originates mainly from chargino-neutralino production.},
doi = {10.1103/PHYSREVD.75.095010},
url = {https://www.osti.gov/biblio/21020511}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 9,
volume = 75,
place = {United States},
year = {2007},
month = {5}
}