[en] Diffractive electroproduction of ρ and φ mesons is measured at HERA with the H1 detector in the elastic and proton dissociative channels. The data correspond to an integrated luminosity of 51 pb^-1. About 10500 ρ and 2000 φ events are analysed in the kinematic range of squared photon virtuality 2.5≤Q²≤60 GeV², photon-proton centre of mass energy 35≤W≤180 GeV and squared four-momentum transfer to the proton vertical stroke 3 vertical stroke ≤ GeV². The total, longitudinal and transverse cross sections are measured as a function of Q², W and vertical stroke 3 vertical stroke. The measurements show a transition to a dominantly ''hard'' behaviour, typical of high gluon densities and small q anti q dipoles, for Q² larger than 10 to 20 GeV². They support flavour independence of the diffractive exchange, expressed in terms of the scaling variable (Q²+M_V²)/4, and proton vertex factorisation. The spin density matrix elements are measured as a function of kinematic variables. The ratio of the longitudinal to transverse cross sections, the ratio of the helicity amplitudes and their relative phases are extracted. Several of these measurements have not been performed before and bring new information on the dynamics of diffraction in a QCD framework. The measurements are discussed in the context of models using generalised parton distributions or universal dipole cross sections. (orig.)

[en] The production of prompt photons is measured in the photoproduction regime of electronproton scattering at HERA. The analysis is based on a data sample corresponding to a total integrated luminosity of 340 pb^-1 collected by the H1 experiment. Cross sections are measured for photons with transverse momentum and pseudorapidity in the range 6< E_T^γ<15 GeV and -1.0<η^γ<2.4, respectively. Cross sections for events with an additional jet are measured as a function of the transverse energy and pseudorapidity of the jet, and as a function of the fractional momenta x_γ and x_p carried by the partons entering the hard scattering process. The correlation between the photon and the jet is also studied. The results are compared with QCD predictions based on the collinear and on the kT factorisation approaches. (orig.)

[en] A measurement of elastic deeply virtual Compton scattering γ^*p→γp using e⁺p and e^-p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 306 pb^-1, almost equally shared between both beam charges. The cross section is measured as a function of the virtuality Q² of the exchanged photon and the centre-of-mass energy W of the γ^*p system in the kinematic domain 6.5 < Q² < 80 GeV², 30< W<140 GeV and vertical stroke t vertical stroke <1 GeV², where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q² and W values and exponential t-slope parameters are derived. Using e⁺p and e^-p data samples, a beam charge asymmetry is extracted for the first time in the low Bjorken x kinematic domain. The observed asymmetry is attributed to the interference between Bethe-Heitler and deeply virtual Compton scattering processes. Experimental results are discussed in the context of two different models, one based on generalised parton distributions and one based on the dipole approach. (orig.)

[en] Inclusive charm and beauty cross sections are measured in e^-p and e⁺p neutral current collisions at HERA in the kinematic region of photon virtuality 5≤Q²≤2000 GeV² and Bjorken scaling variable 0.0002≤x≤0.05. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb^-1. The numbers of charm and beauty events are determined using variables reconstructed by the H1 vertex detector including the impact parameter of tracks to the primary vertex and the position of the secondary vertex. The measurements are combined with previous data and compared to QCD predictions. (orig.)

[en] The production of jets is studied in deep-inelastic e⁺p scattering at low negative four momentum transfer squared 5 < Q² < 100 GeV² and at inelasticity 0.2 < y < 0.7 using data recorded by the H1 detector at HERA in the years 1999 and 2000, corresponding to an integrated luminosity of 43.5 pb^-1. Inclusive jet, 2-jet and 3-jet cross sections as well as the ratio of 3-jet to 2-jet cross sections are measured as a function of Q² and jet transverse momentum. The 2-jet cross section is also measured as a function of the proton momentum fraction ξ. The measurements are well described by perturbative quantum chromodynamics at next-to-leading order corrected for hadronisation effects and are subsequently used to extract the strong coupling α_s. (orig.)

[en] 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< Q²<8,000 GeV². The difference between the event normalised distributions of the scaled momentum, x_p, for positively and negatively charged particles, measured in the current region of the Breit frame, is studied together with its evolution as a function of Q. The results are compared to Monte Carlo models at the hadron and parton level. (orig.)

[en] A search for single top quark production is performed in the full e^±p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb^-1. Decays of top quarks into a b quark and a W boson with subsequent leptonic or hadronic decay of the W are investigated. A multivariate analysis is performed to discriminate top quark production from Standard Model background processes. An upper limit on the top quark production cross section via flavour changing neutral current processes σ(ep→etX)<0.25 pb is established at 95% CL. Limits on the anomalous coupling κ_tuγ are derived.

[en] This conference on 'Particle Physics and Cosmology' will emphasize the increasing interplay between high energy accelerator based physics and cosmology. The meeting will be articulated around the results and their impact on current theories from the 3 major new experimental and observational facilities which are coming on line or have recently been commissioned: the Large Hadron Collider at CERN, the Planck satellite, and the Herschel satellite. The topics will include: -) the Standard Model in particle physics, in new data and analyses, -) the search for the Higgs boson, -) theories of and searches for physics beyond the Standard Model, -) heavy flavour physics, -) neutrino physics (astrophysical and laboratory), -) dark matter, dark energy and recent advances in cosmology. This document gathers the program, the slides and some abstracts of the presentations

[en] The production of prompt photons is measured in the photoproduction regime of electron-proton scattering at HERA. The analysis is based on a data sample corresponding to a total integrated luminosity of 340 pb^-1 collected by the H1 experiment. Cross sections are measured for photons with transverse momentum and pseudorapidity in the range 6< E_T^γ<15 GeV and -1.0<η ^γ <2.4, respectively. Cross sections for events with an additional jet are measured as a function of the transverse energy and pseudorapidity of the jet, and as a function of the fractional momenta x_γ and x_p carried by the partons entering the hard scattering process. The correlation between the photon and the jet is also studied. The results are compared with QCD predictions based on the collinear and on the k_T factorization approaches. (orig.) 7

[en] Inclusive charm and beauty cross sections are measured in e^-p and e⁺ p neutral current collisions at HERA in the kinematic region of photon virtuality 5≤Q ²≤2000 GeV² and Bjorken scaling variable 0.0002≤x≤0.05. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb^-1. The numbers of charm and beauty events are determined using variables reconstructed by the H1 vertex detector including the impact parameter of tracks to the primary vertex and the position of the secondary vertex. The measurements are combined with previous data and compared to QCD predictions. (orig.)