Journal
PHYSICAL REVIEW D
Volume 82, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.114023
Keywords
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Funding
- U.S. Department of Energy [DE-AC02-06CH11357, DE-FG02-04ER41299, DE-SC0003870]
- U.S. National Science Foundation [PHY-0705862, PHY-0855561]
- Lightner-Sams Foundation
- National Science Council of Taiwan [NSC-98-2112-M-133-002-MY3, NSC-99-2918-I-133-001]
- U.S. Department of Energy (DOE) [DE-SC0003870] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Physics [705682] Funding Source: National Science Foundation
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We report a parton distribution function analysis of a complete set of hadron scattering data, in which a color-octet fermion (such as a gluino of supersymmetry) is incorporated as an extra parton constituent along with the usual standard model constituents. The data set includes the most up-to-date results from deep inelastic scattering and from jet production in hadron collisions. Another feature is the inclusion in the fit of data from determinations of the strong coupling alpha(s)(Q) at large and small values of the hard scale Q. Our motivation is to determine the extent to which the global parton distribution function analysis may provide constraints on the new fermion, as a function of its mass and alpha(s)(M-Z), independent of assumptions such as the mechanism of gluino decays. Based on this analysis, we find that gluino masses as low as 30 to 50 GeV may be compatible with the current hadronic data. Gluino masses below 15 GeV (25 GeV) are excluded if alpha(s)(M-Z) varies freely (is equal to 0.118). At the outset, stronger constraints had been anticipated from jet production cross sections, but experimental systematic uncertainties, particularly in normalization, reduce the discriminating power of these data.
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