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(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current ... scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb... and span six orders of magnitude in negative four-momentum-transfer squared, ..., and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in ... An extraction of ... and results on electroweak unification and scaling violations are also presented.

The holographic graviton soft-wall model, introduced to describe the spectrum of scalar and tensor glueballs, is improved to incorporate the realization of chiral-symmetry as in QCD. Such a goal is achieved by including the longitudinal dynamics of QCD into the scheme. Using the relation between AdS/QCD and Light-Front dynamics, we construct the appropriate wave function for the pion which is used to calculate several pion observables. The comparison of our results with phenomenology is remarkably successful.

We consider the production of \\(W\\)-boson plus dijet, \\(W\\)-boson plus b-jets and same sign \\(WW\\) via double parton scattering (DPS) in \\(pA\\) collisions at the LHC and evaluate the corresponding cross sections. The impact of a novel DPS contribution pertinent to \\(pA\\) collisions is quantified. Exploiting the experimental capability of performing measurements differential in the impact parameter in \\(pA\\) collisions, we discuss a method to single out this novel DPS contribution. The method allows the subtraction of the leading twist (LT) single parton scattering background and it gives access in a very clean way to double parton distribution functions in the proton. We calculate leading twist and DPS cross sections and study the dependence of the observables on the cuts in the jets phase space. In the \\(Wjj\\) channel the observation of DPS is possible with data already accumulated in \\(pA\\) runs and the situation will greatly improve for the next high luminosity runs. For the \\(Wb\\bar{b}\\) final state, the statistics within the current data is too low, but there is possibility to observe DPS in this channel in future runs, albeit with much reduced sensitivity than in \\(Wjj\\) final state. Finally the DPS observation in the same sign \\(WW\\) channel will require either significant increase of integrated luminosity beyond that foreseen in next \\(pA\\) runs or improved methods for \\(W\\) reconstruction, along with its charge, in hadronic decay channels.

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).Measurements of normalised cross sections for the production of photons and neutrons at very small angles with respect to the proton beam direction in deep-inelastic ... scattering at HERA are presented as a function of the Feynman variable ... and of the centre-of-mass energy of the virtual photon-proton system ... The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of ... The measurement is restricted to photons and neutrons in the pseudorapidity range ... and covers the range of negative four momentum transfer squared at the positron vertex ... GeV..., of inelasticity ... and of ...GeV. To test the Feynman scaling hypothesis the ... dependence of the ... dependent cross sections is investigated. Predictions of deep-inelastic scattering models and of models for hadronic interactions of high energy cosmic rays are compared to the measured cross sections.

Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities ... using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of ... Double differential Jet cross sections are obtained using a regularised unfolding procedure. They are presented as a function of ... and the transverse momentum of the jet, ..., and as a function of ... and the proton's longitudinal momentum fraction, ..., carried by the parton participating in the hard interaction. In addition normalised double differential jet cross sections are measured as the ratio of the jet cross sections to the inclusive neutral current cross sections in the respective ... bins of the jet measurements. Compared to earlier work, the measurements benefit from an improved reconstruction and calibration of the hadronic final state. The cross sections are compared to perturbative QCD calculations in next-to-leading order and are used to determine the running coupling and the value of the strong coupling constant as ...

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).Inclusive ... double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken with a lepton beam energy of ... GeV and two proton beam energies of ... and 575 GeV corresponding to centre-of-mass energies of 225 and 252 GeV, respectively. The measurements cover the region of ... for ... GeV... up to ... The measurements are used together with previously published H1 data at ... GeV and lower ... data at ..., ... and ... GeV to extract the longitudinal proton structure function ... in the region ... GeV...

Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities 150 < Q 2 < 15 000 GeV 2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of 351 pb - 1 . Double differential Jet cross sections are obtained using a regularised unfolding procedure. They are presented as a function of Q 2 and the transverse momentum of the jet, P T jet , and as a function of Q 2 and the proton’s longitudinal momentum fraction, ξ , carried by the parton participating in the hard interaction. In addition normalised double differential jet cross sections are measured as the ratio of the jet cross sections to the inclusive neutral current cross sections in the respective Q 2 bins of the jet measurements. Compared to earlier work, the measurements benefit from an improved reconstruction and calibration of the hadronic final state. The cross sections are compared to perturbative QCD calculations in next-to-leading order and are used to determine the running coupling and the value of the strong coupling constant as α s ( M Z ) = 0.1165 ( 8 ) exp ( 38 ) pdf , theo .

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Inclusive ... double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken with a lepton beam energy of ... GeV and two proton beam energies of ... and 575 GeV corresponding to centre-of-mass energies of 225 and 252 GeV, respectively. The measurements cover the region of ... for ... GeV... up to ... The measurements are used together with previously published H1 data at ... GeV and lower ... data at ..., ... and ... GeV to extract the longitudinal proton structure function ... in the region ... GeV...