Radiative corrections to a supersymmetric relation: A new approach

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.58.075002· OSTI ID:658521

Kiyoura, S ^[1]; Kiyoura, S ^[2]; Nojiri, M M ^[3]; Pierce, D M ^[4]; Yamada, Y ^[5]

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1. KEK Theory Group, Oho 1-1, Tsukuba, Ibaraki 305-0801 (Japan)
2. Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551 (Japan)
3. YITP, Kyoto University, Kyoto 606-8502 (Japan)
4. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
5. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

Recently it has been realized that the production and decay processes of charginos, neutralinos, and sleptons receive corrections which grow like logm{sub {tilde q}} for large m{sub {tilde q}}. In this paper we calculate the chargino pair production cross section at e{sup +}e{sup {minus}} colliders with quark-squark loop corrections. We introduce a novel formulation, where the one-loop amplitude is reorganized into two parts. One part is expressed in terms of the {open_quotes}effective{close_quotes} chargino coupling {bar g}{sub e{tilde {nu}}{tilde W}} and mixing matrices U{sup P},V{sup P}, and includes all O(logm{sub {tilde q}}) corrections, while the other decouples for large m{sub {tilde q}}. The form of the one-loop cross section then becomes physically transparent. Our formulation can be easily extended to other loops and processes. Numerically, we find significant corrections due to the effective t-channel coupling {bar g}{sub e{tilde {nu}}{tilde W}}, for gaugino-like charginos. In the mixed region, where the chargino has large gaugino and Higgsino components, the corrections due to (U{sup P},V{sup P}) are also significant. Our numerical results disagree with a previous calculation. We reexamine previous studies of the determination of {bar g}{sub e{tilde {nu}}{tilde W}} through the measurement of the chargino production cross section. We point out that a previous study, which claimed that the measurement suffers large systematic errors, was performed at a {open_quotes}pessimistic{close_quotes} point in MSSM parameter space. We provide reasons why the systematic errors are not a limiting factor for generic parameter choices. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 658521
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 58; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGED PARTICLES
CROSS SECTIONS
HIGGS BOSONS
LEPTONS
MIXING
NEUTRAL PARTICLES
PARTICLE PRODUCTION
QUARKS
RADIATIVE CORRECTIONS
RENORMALIZATION
SPARTICLES
SUPERSYMMETRY
UNIFIED GAUGE MODELS