Search for QCD instanton-induced processes at HERA in the high-Q.sup.2./sup. domain

0469046 - FZÚ 2017 RIV DE eng J - Journal Article
Andreev, V. - Baghdasaryan, A. - Begzsuren, K. - Cvach, Jaroslav - Ferencei, Jozef - Hladký, Jan - Reimer, Petr … Total 142 authors
Search for QCD instanton-induced processes at HERA in the high-Q² domain.
European Physical Journal C. Roč. 76, č. 7 (2016), 1-16, č. článku 381. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT LG14033
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : deep-inelastic scattering * neutral currents * instantons * QCD
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 5.297, year: 2016

Signals of QCD instanton-induced processes are searched for in neutral current deep-inelastic scattering at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable x>10−3, the inelasticity 0.2<y<0.7 and the photon virtuality 150<Q2<15000 GeV2. The search is performed using H1 data corresponding to an integrated luminosity of 351 pb −1. No evidence for the production of QCD instanton-induced events is observed. Upper limits on the cross section for instanton-induced processes between 1.5 and 6 pb, at 95% confidence level, are obtained depending on the kinematic domain in which instantons could be produced. Compared to earlier publications, the limits are improved by an order of magnitude and for the first time are challenging predictions.

Permanent Link: http://hdl.handle.net/11104/0266942