Abstract
A search for physics beyond the Standard Model has been performed with high-Q2 neutral current deep inelastic scattering events recorded with the ZEUS detector at HERA. Two data sets, e+p→e+X and e−p→e−X, with respective integrated luminosities of 112 pb−1 and 16 pb−1, were analyzed. The data reach Q2 values as high as 40000 GeV2. No significant deviations from Standard Model predictions were observed. Limits were derived on the effective mass scale in eeqq contact interactions, the ratio of leptoquark mass to the Yukawa coupling for heavy leptoquark models and the mass scale parameter in models with large extra dimensions. The limit on the quark charge radius, in the classical form factor approximation, is 0.85×10−16 cm.
Highlights
The HERA ep collider has extended the kinematic range of deep inelastic scattering (DIS) measurements by two orders of magnitude in Q2, the negative square of the four-momentum transfer, compared to fixed-target experiments
The probability of obtaining larger best-fit coupling from the Standard Model (SM), i.e., the probability that an experiment would produce a value of |η0| greater than that obtained from the data, |η0| > |η0data|, calculated with Monte Carlo experiments (MCE) assuming the SM cross section, was above 25% in all cases
A search for signatures of physics beyond the Standard Model has been performed with the e+p and e−p data collected by the ZEUS Collaboration in the years 1994–2000, with integrated luminosities of 112 and 16 pb−1, reaching Q2 values as high as 4 × 104 GeV2
Summary
SFoelelonwextthipsaagnedfoardadditdioitnioanl awloaruktshaotr:shttps://digitalcommons.andrews.edu/pubs Part of the Physics Commons. Recommended Citation Chekanov, S.; Derrick, M.; Krakauer, D.; Loizides, J. H.; Magill, S.; Miglioranzi, S.; Musgrave, B.; Repond, J.; Yoshida, R.; Mattingly, Margarita C. K.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cara Romeo, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Corradi, M.; de Pasquale, S.; Giusti, P.; Iacobucci, G.; Margotti, A.; Montanari, A.; Nania, R.; Palmonari, F.; Pesci, A.; and Sartorelli, G., "Search for Contact Interactions, Large Extra Dimensions and Finite Quark Radius in ep Collisions at HERA" (2004). This article is available at Digital Commons @ Andrews University: https://digitalcommons.andrews.edu/pubs/2199. Search for contact interactions, large extra dimensions and finite quark radius in ep collisions at HERA.
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