# Search for QCD instanton-induced processes at HERA in the high-${Q^2}$ domain

Andreev, V; Baghdasaryan, A; Begzsuren, K; Müller, K; Robmann, P; Straumann, U; Truöl, P; et al (2016). Search for QCD instanton-induced processes at HERA in the high-${Q^2}$ domain. European Physical Journal C - Particles and Fields, 76:381.

## Abstract

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 vir- tuality 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 pro- cesses between 1.5 pb and 6 pb, at 95% confidence level, are obtained depending on the kinematic domain in which instantons could be produced. Compared to earlier publica- tions, the limits are improved by an order of magnitude and for the first time are challenging predictions.

## Abstract

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 vir- tuality 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 pro- cesses between 1.5 pb and 6 pb, at 95% confidence level, are obtained depending on the kinematic domain in which instantons could be produced. Compared to earlier publica- tions, the limits are improved by an order of magnitude and for the first time are challenging predictions.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2016 27 Dec 2016 08:35 02 Feb 2018 11:08 Springer 1434-6044 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-016-4194-6