Strangeness Production in Deep-Inelastic ep Scattering at HERA

The production of neutral strange hadrons is studied using deep-inelastic events measured with the H1 detector at HERA. The measurements of $K_{s}^{0}$ and Λ($\overline Λ$) productions are made in two regions of phase space defined by the negative four-momentum transferred squared of the photon, 7 < $\it Q^{2}$ <100$\it GeV^{2}$ and the inelasticity 0.1 < $\it y$ < 0.6 for the $K_{s}^{0}$ and 145 < $\it Q^{2}$ < 20000$\it GeV^{2}$ and 0.2 < $\it y$ < 0.6 for the Λ . $K_{s}^{0}$ and Λ(\overline Λ) production cross sections are determined.Differential ratios of $K_{s}^{0}$ production to charged hadron production are measured. Differential Λ($\overline Λ$) yields per event aredetermined. The Λ − $\overline Λ$ asymmetry is measured and found to be consistent with zero. Predictions of leading order Monte Carlo programs are compared to data

Strangeness Production in Deep Inelastic Scattering at HERA

The production of neutral strange hadrons is studied using deep-inelastic events measured with the H1 detector at HERA. The measurements of $K_{s}^{0}$ and Λ($\overline Λ$) productions are made in two regions of phase space defined by the negative four-momentum transferred squared of the photon, 7 < $\it Q^{2}$ <100$\it GeV^{2}$ and the inelasticity 0.1 < $\it y$ < 0.6 for the $K_{s}^{0}$ and 145 < $\it Q^{2}$ < 20000$\it GeV^{2}$ and 0.2 < $\it y$ < 0.6 for the Λ . $K_{s}^{0}$ and Λ(\overline Λ) production cross sections are determined.Differential ratios of $K_{s}^{0}$ production to charged hadron production are measured. Differential Λ($\overline Λ$) yields per event aredetermined. The Λ − $\overline Λ$ asymmetry is measured and found to be consistent with zero. Predictions of leading order Monte Carlo programs are compared to data

Strangeness Production in Deep-Inelastic ep Scattering at HERA

The production of neutral strange hadrons is studied using deep-inelastic events measured with the H1 detector at HERA. The measurements of $K^0_s$ and $\Lambda(\bar{\Lambda}$ productions are made in two regions of phase space defined by the negative four-momentum transferred squared of the photon, $7 < Q^2 < 100$ GeV$^2$ and the inelasticity $0.1 < y < 0.6$ for the $K^0_s$ and $145 < Q^2 < 20000$ GeV$^2$ and $0.2 < y < 0.6$ for the $\Lambda$. $K^0_s$ and \Lamdba(\bar{\Lambda}) production cross sections are determined. Differential ratios of $K^0_s$ production to charged hadron production are measured. Differential $\Lambda($\bar{\Lambda})$yields per event are determined. The$\Lambda − \bar{\Lambda}$ asymmetry is measured and found to be consistent with zero. Predictions of leading orderMonte Carlo programs are compared to data

Measurement of lepton-jet correlation in deep-inelastic scattering with the H1 detector using machine learning for unfolding

The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high momentum transfer is presented. These data, taken with the H1 detector at HERA, are corrected for detector effects using an unbinned machine learning algorithm OmniFold, which considers eight observables simultaneously in this first application. The unfolded cross sections are compared to calculations performed within the context of collinear or transverse-momentum-dependent (TMD) factorization in Quantum Chromodynamics (QCD) as well as Monte Carlo event generators. The measurement probes a wide range of QCD phenomena, including TMD parton distribution functions and their evolution with energy in so far unexplored kinematic regions

Colombeau generalized functions on manifolds

Eduard NigschZsfassung in dt. SpracheWien, Techn. Univ. u. Univ., Dipl.-Arb., 2006OeBB(VLID)161012

Erratum to: Measurement of jet production cross sections in deep-inelastic ep scattering at HERA

The measurement of the jet cross sections by the H1 collaboration had been compared to various predictions including the next-to-next-to-leading order (NNLO) QCD calculations which are corrected in this erratum for an implementation error in one of the components of the NNLO calculations. The jet data and the other predictions remain unchanged. Eight figures, one table and conclusions are adapted accordingly, exhibiting even better agreement between the corrected NNLO predictions and the jet data

Diffractive Dijet Production with a Leading Proton in ep Collisions at HERA

The cross section of the diffractive process e^+p -> e^+Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q^2 <2 GeV^2 and in deep-inelastic scattering with 4 GeV^2<Q^2<80 GeV^2. The results are compared to next-to-leading order QCD calculations based on diffractive parton distribution functions as extracted from measurements of inclusive cross sections in diffractive deep-inelastic scattering

Exclusive ρ0\rho^0 Meson Photoproduction with a Leading Neutron at HERA

A first measurement is presented of exclusive photoproduction of $\rho^0$ mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years $2006$ and $2007$ at a centre-of-mass energy of $\sqrt{s}=319$ GeV and correspond to an integrated luminosity of $1.16$ pb$^{-1}$. The $\rho^0$ mesons with transverse momenta $p_T0.35$, are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality $Q^2 < 2$ GeV$^2$, the total energy of the photon-proton system $20 < W_{\gamma p} < 100$ GeV and the polar angle of the leading neutron $\theta_n < 0.75$ mrad. The cross section of the reaction $\gamma p \to \rho^0 n \pi^+$ is measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a $\rho^0$ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, $\sigma^{\rm el}(\gamma\pi^+ \to \rho^0\pi^+)$, is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $\gamma p\to\rho^0 n \pi^+$

Measurement of Dijet Production in Diffractive Deep-Inelastic ep Scattering at HERA

A measurement is presented of single- and double-differential dijet cross sections in diffractive deep-inelastic $ep$ scattering at HERA using data collected by the H1 experiment corresponding to an integrated luminosity of 290 pb^{-1}. The investigated phase space is spanned by the photon virtuality in the range of 4<Q^{2}<100 GeV^{2} and by the fractional proton longitudinal momentum loss x_pom<0.03. The resulting cross sections are compared with next-to-leading order QCD predictions based on diffractive parton distribution functions and the value of the strong coupling constant is extracted