Slepton production as a probe of the squark mass scale

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.57.1539· OSTI ID:573911

Nojiri, M M ^[1]; Pierce, D M ^[2]; Yamada, Y ^[3]

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1. KEK Theory Group, Oho 1-1, Tsukuba, Ibaraki 305 (Japan)
2. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
3. Department of Physics, Tohoku University, Sendai 980-77 (Japan)

We investigate an important radiative correction to the slepton and chargino production processes. We consider a supersymmetric spectrum with a large splitting between the squark and slepton masses. In this case, in the effective theory below the squark mass threshold, the supersymmetric Slavnov-Taylor identities which enforce the equality of the gauge and gaugino couplings are violated. The gaugino propagators receive potentially large corrections due to virtual quark or squark loop effects. We compute the full one-loop (s)quark corrected slepton production cross sections. The t-channel one-loop scattering amplitudes are factorized into an effective chargino-neutralino mass matrix and an effective fermion-sfermion-gaugino coupling. The difference between the effective gaugino coupling and the gauge coupling is proportional to ln(M{sub {tilde Q}}/m{sub scr(l{tilde )}}) in the large squark mass limit. We find that the one-loop corrected slepton production cross sections can depend on the squark mass strongly, up to 9{percent}{times}log{sub 10}(M{sub {tilde Q}}/m{sub scr(l{tilde )}}). We investigate the squark mass sensitivity of the slepton cross-section measurements at a future linear collider. For sneutrino production accessible at {radical} (s) =500 GeV there can be sensitivity to squark masses at or larger than 1 TeV. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 573911
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 57; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COUPLING
CROSS SECTIONS
FACTORIZATION
LEPTONS
MASS
NEUTRINOS
PARTICLE PRODUCTION
QUARKS
RADIATIVE CORRECTIONS
SCATTERING AMPLITUDES
SENSITIVITY
SPARTICLES
SUPERSYMMETRY
T CHANNEL
UNIFIED GAUGE MODELS