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Search Results: 1 - 10 of 154885 matches for " on behalf of the H1 "
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Vector meson production at HERA
Jan Figiel,on behalf of the ZEUS,H1 collaborations
Physics , 2001,
Abstract: New results on elastic electroproduction and proton-dissociative photoproduction at large t of rho, phi and J/psi mesons are presented. They are interpreted within perturbative QCD.
Precision measurements with jets and particles at HERA
Katharina Müller on behalf of the H1,ZEUS Collaborations
Physics , 2010, DOI: 10.1016/j.nuclphysbps.2010.10.004
Abstract: Inclusive jet and multijet cross sections measured in ep collisions in different kinematic regions by the H1 and ZEUS experiments are shown. The measurements are used to extract the strong coupling alpha_s as a function of the scale and at the mass of the Z-boson. Results from prompt photon production in comparison with pQCD calculations are shown in photoproduction and deep-inelastic scattering. Other topics address scaled momentum distributions of charged particles, a measurement of the transverse momenta of charged particles and the first measurement of the charge asymmetry at HERA.
Experimental Studies of Diffractive Processes at HERA
A. A. Savin,on behalf of the H1,ZEUS collaborations
Physics , 2001,
Abstract: Diffractive processes in photon-proton interactions at HERA offer the opportunity to improve the understanding of the transition between the soft, non-perturbative regime in hadronic interactions at $Q^2 = 0$ and the perturbative region at high $Q^2$. Recent experimental results from HERA on inclusive diffractive scattering, exclusive vector meson production and the properties of the hadronic final state in diffraction are reviewed. The results are discussed in the context of current theoretical models.
Determination of Charm Quark Mass and $α_s(M_Z)$ from HERA data
A M Cooper-Sarkar,on behalf of the H1,ZEUS Collaborations
Physics , 2013, DOI: 10.1142/S0217732313600171
Abstract: Charm production data from HERA can be used to determine the charm quark mass and jet production data from HERA can be used to detrmine $\alpha_s(M_Z)$. recent results are summarised.
Jet Production in ep Collisions at Low Q^2 and Determination of alpha_s
The H1 Collaboration
Physics , 2009, DOI: 10.1140/epjc/s10052-010-1282-x
Abstract: The production of jets is studied in deep-inelastic e+p scattering at low negative four momentum transfer squared 5
Measurement of the D* Meson Production Cross Section and F_2^{ccbar}, at High Q^2, in ep Scattering at HERA
The H1 Collaboration
Physics , 2009, DOI: 10.1016/j.physletb.2010.02.024
Abstract: The inclusive production of D*(2010) mesons in deep-inelastic ep scattering is measured in the kinematic region of photon virtuality 100 < Q^2 < 1000 GeV^2 and inelasticity 0.02 < y < 0.7. Single and double differential cross sections for inclusive D* meson production are measured in the visible range defined by |eta(D*)| < 1.5 and p_T(D*) > 1.5 GeV. The data were collected by the H1 experiment during the period from 2004 to 2007 and correspond to an integrated luminosity of 351 pb^{-1}. The charm contribution, F_2^{ccbar}, to the proton structure function F_2 is determined. The measurements are compared with QCD predictions.
Measurement of the Proton Structure Function F_L at Low x
H1 Collaboration
Physics , 2008, DOI: 10.1016/j.physletb.2008.05.070
Abstract: A first measurement is reported of the longitudinal proton structure function F_L(x,Q^2) at the ep collider HERA. It is based on inclusive deep inelastic e^+p scattering cross section measurements with a positron beam energy of 27.5 GeV and proton beam energies of 920, 575 and 460 GeV. Employing the energy dependence of the cross section, F_L is measured in a range of squared four-momentum transfers 12 < Q^2 < 90 GeV^2 and low Bjorken x 0.00024 < x < 0.0036. The F_L values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA.
Search for Excited Electrons in ep Collisions at HERA
H1 Collaboration
Physics , 2008, DOI: 10.1016/j.physletb.2008.07.014
Abstract: A search for excited electrons is performed using the full $e^{\pm}p$ data sample collected by the H1 experiment at HERA, corresponding to a total luminosity of 475 pb$^{-1}$. The electroweak decays of excited electrons ${e}^{*}\to{e}{\gamma}$, ${e}^{*}\to{e}Z$ and ${e}^{*}{\to}\nu W$ with subsequent hadronic or leptonic decays of the $W$ and $Z$ bosons are considered. No evidence for excited electron production is found. Mass dependent exclusion limits on $e^*$ production cross sections and on the ratio $f/{\Lambda}$ of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited electron searches. The $e^*$ production via contact interactions is also addressed for the first time in $ep$ collisions.
Inelastic Production of J/psi Mesons in Photoproduction and Deep Inelastic Scattering at HERA
H1 Collaboration
Physics , 2010, DOI: 10.1140/epjc/s10052-010-1376-5
Abstract: A measurement is presented of inelastic photo- and electroproduction of J/psi mesons in ep scattering at HERA. The data were recorded with the H1 detector in the period from 2004 to 2007. Single and double differential cross sections are determined and the helicity distributions of the J/psi mesons are analysed. The results are compared to theoretical predictions in the colour singlet model and in the framework of non-relativistic QCD. Calculations in the colour singlet model using a k_T factorisation ansatz are able to give a good description of the data, while colour singlet model calculations to next-to-leading order in collinear factorisation underestimate the data.
Observation of the Hadronic Final State Charge Asymmetry in High Q^2 Deep-Inelastic Scattering at HERA
The H1 Collaboration
Physics , 2009, DOI: 10.1016/j.physletb.2009.09.056
Abstract: A first measurement is presented of the charge asymmetry in the hadronic final state from the hard interaction in deep-inelastic ep neutral current scattering at HERA. The measurement is performed in the range of negative squared four momentum transfer 100
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