Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-10
Eur.Phys.J.C71:1611,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 tables, no figures. Published Version
Scientific paper
10.1140/epjc/s10052-011-1611-8
We perform a global fit on parity-conserving electron-quark interactions via spin-1 unparticle exchange. Besides the peculiar features of unparticle exchange due to non-integral values for the scaling dimension d_U and a non-trivial phase factor exp (-id_U \pi) associated with a time-like unparticle propagator, the energy dependence s^{-2 + d_U} of the unparticle contributions in the scattering amplitudes are also taken into account. The high energy data sets taken into consideration in our analysis are from (1) deep inelastic scattering at high Q^2 from ZEUS and H1, (2) Drell-Yan production at Run II of CDF and DO, and (3) e^+e^- --> hadrons at LEPII. The hadronic data at LEPII by itself indicated a 3-4 sigma preference of new physics over the Standard Model. However, when all data sets are combined, no preference for unparticle effects can be given. We thus deduce an improved 95% confidence level limit on the unparticle energy scale \Lambda_\U.
Chang Chun-Fu
Cheung Kingman
Yuan Tzu-Chiang
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