Trileptons from chargino-neutralino production at the CERN Large Hadron Collider

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.4508· OSTI ID:7033658

Baer, H; Chen, C ^[1]; Paige, F ^[2]; Tata, X ^[3]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822 (United States)

We study direct production of charginos and neutralinos at the CERN Large Hadron Collider. We simulate all channels of chargino and neutralino production using ISAJET 7.07. The best mode for observing such processes appears to be [ital pp][r arrow][ital [tilde W]][sub 1][ital [tilde Z]][sub 2][r arrow]3[ital l]+[ital ];sE[sub [ital T]]. We evaluate signal expectations and background levels, and suggest cuts to optimize the signal. The trilepton mode should be viable provided [ital m][sub [ital [tilde g]]][approx lt]500--600 GeV; above this mass, the decay modes [ital [tilde Z]][sub 2][r arrow][ital [tilde Z]][sub 1][ital Z] and [ital [tilde Z]][sub 2][r arrow][ital H][sub [ital l]][ital [tilde Z]][sub 1] become dominant, spoiling the signal. In the first case, the leptonic branching fraction for [ital Z] decay is small and additional background from [ital WZ] is present, while in the second case, the trilepton signal is essentially absent. For smaller values of [ital m][sub [ital [tilde g]]], the trilepton signal should be visible above background, especially if [vert bar][mu][vert bar][congruent][ital m][sub [ital [tilde g]]] and [ital m][sub [ital [tilde l]]][much lt][ital m][sub [ital [tilde q]]], in which case the leptonic decays of [ital [tilde Z]][sub 2] are enhanced. Distributions in dilepton mass [ital m]([ital l[bar l]]) can yield direct information on neutralino masses due to the distribution cutoff at [ital m][sub [ital [tilde Z]]2][minus][ital m][sub [ital [tilde Z]]1]. Other distributions that may lead to an additional constraint amongst the chargino and neutralino masses are also examined.

• DOE Contract Number: FG05-87ER40319; AC02-76CH00016; AM03-76SF00235
• OSTI ID: 7033658
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662340 -- Hadron Interactions-- (1992-)
662440* -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CERN
CHARGED PARTICLES
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INTERNATIONAL ORGANIZATIONS
LEPTONIC DECAY
LEPTONS
MASS
MASSLESS PARTICLES
NEUTRINOS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
SIGNALS
SPARTICLES
SUPERSYMMETRY
SYMMETRY
WEAK INTERACTIONS
WEAK PARTICLE DECAY
Z NEUTRAL BOSONS