ATLAS

Abstract:

A summary of the experimental and theoretical presentations in the Structure Function Working Group on the proton and photon unpolarized structure functions is given.

Abstract:

We report on measurements of the branching ratios of the decays B⁺→Xcl⁰(1P)K⁺ and B⁺ →J/ψK⁺π⁺π^-, where Xcl⁰(1P)→J/ψγ and J/ψ→μ⁺μ^- in pp collisions at √s= 1.8 TeV. Using a data sample from an integrated luminosity of 110 pb^-1 collected by the Collider Detector at Fermilab we measure the branching ratios to be BR(B⁺→Xcl⁰(1P) K⁺)=15.5±5.4(stat)±1.5(syst)±1.3(br)× 10^-4 and BR(B⁺ →J/ψK⁺π⁺π^-)=6.9 ±1.8(stat)±1.1(syst)±0.4(br)×10^-4 where (br) is due to the finite precision on BR(B^-→J/ψK⁺), BR(Xcl⁰(1P)→J/ψγ)is used to normalize the signal yield, and (syst) encompasses all other systematic uncertainties.

Abstract:

Diffractive dissociation of virtual photons, γ*p → Xp, has been studied in ep interactions with the ZEUS detector at HERA. The data cover photon virtualities 0.17 < Q² < 0.70 GeV² and 3 < Q² < 80 GeV² with 3 < MX < 38 GeV, where MX is the mass of the hadronic final state. Diffractive events were selected by two methods: the first required the detection of the scattered proton in the ZEUS leading proton spectrometer (LPS); the second was based on the distribution of MX. The integrated luminosities of the low- and high-Q² samples used in the LPS-based analysis are ≃ 0.9 pb^-1 and ≃ 3.3 pb^-1, respectively. The sample used for the MX-based analysis corresponds to an integrated luminosity of ≃ 6.2 pb^-1. The dependence of the diffractive cross section on W, the virtual photon-proton centre-of-mass energy, and on Q² is studied. In the low-Q² range, the energy dependence is compatible with Regge theory and is used to determine the intercept of the Pomeron trajectory. The W dependence of the diffractive cross section exhibits no significant change from the low-Q² to the high-Q² region. In the low-Q² range, little Q² dependence is found, a significantly different behaviour from the rapidly falling cross section measured for Q² > 3 GeV². The ratio of the diffractive to the virtual photon-proton total cross section is studied as a function of W and Q². Comparisons are made with a model based on perturbative QCD.