Conveners
Diffraction and Pomeron
- Marek Tasevsky (Institute of Physics of AS CR)
- Roman Pasechnik (Lund University)
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Grzegorz Gach (AGH University of Science and Technology)05/10/2015, 14:00Diffraction and PomeronOral PresentationThe ATLAS collaboration has carried out a study diffractive dijet production at 7 TeV pp collisions at the LHC, i.e. events with a hadronic system containing at least two jets in addition to a large region of pseudorapidity devoid of hadronic activity. The data distributions are compared with Monte Carlo models and the rapidity gap survival probability has been estimated in the kinematic...Go to contribution page
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Ms Christine Rasmussen (Lund University)05/10/2015, 14:20Diffraction and PomeronOral PresentationWe present a new model for hard diffraction in Pythia8. The model uses the Pomeron approach pioneered by Ingelman and Schlein, factorising the diffractive cross section into a Pomeron flux and a Pomeron PDF, with several choices for both implemented in Pythia8. The main feature of the model is that it allows for any Pythia8 hard process to be generated diffractively, and includes an option...Go to contribution page
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Dr Gabor Veres (CERN)05/10/2015, 14:35Diffraction and PomeronOral PresentationRecent CMS results regarding forward physics and diffraction are reviewed. The differential diffractive cross section is measured as a function of xi= M_X^2/s in the region dominated by single dissociation (SD) and double dissociation (DD), where M_X is the mass of one of the two final-state hadronic systems separated by the largest rapidity gap in the event. The cross section is also measured...Go to contribution page
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Prof. Tamas Csorgo (Wigner RCP Budapest and KRF Gyongyos)05/10/2015, 14:55Diffraction and PomeronOral PresentationThe TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy sqrt(s) = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented...Go to contribution page
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Prof. Errol (Asher) Gotsman (Tel Aviv University)05/10/2015, 15:15Diffraction and PomeronOral PresentationI discuss a model based on Coloured-Glass-Condensate/saturation and the BFKL Pomeron. I show that this model successfully describes the elastic, diffractive and inclusive data at LHC energies. The talk is based on material appearing in arXiv:1408.3811, arXiv:a502.05202 and arXiv: 1503.04294Go to contribution page
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Prof. Laszlo Jenkovszky (Bogolyubov ITP, Kiev)05/10/2015, 15:30Diffraction and PomeronOral PresentationIt is shown that “soft” proton-proton collisions at the LHC, from 2 TeV and beyond are dominated by Pomeron exchange. This is quantified e.g. by fitting the elastic scattering cross-section to the available (7 and 8 TeV) data, where the contribution from secondary Reggeons is shown to be smaller than the relevant experimental errors. A tiny Odderon contribution is also scrutinized and its...Go to contribution page
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Prof. Antoni Szczurek (Institute of Nuclear Physics and Rzeszow University)05/10/2015, 16:15Diffraction and PomeronI will review recent progress in exclusive production of mesons and dileptons in proton-proton collisions. This includes exclusive production of J/psi, psi' and rho^0 mesons as well as production of two pions, two leptons, two photons or two charged Higgs bosons. In the case of the charmonia a k_t-factorization method with unintegrated gluon distributions is applied. A possible sign of...Go to contribution page
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Dr Wlodek Guryn (Brookhaven National Laboratory)05/10/2015, 16:30Diffraction and PomeronOral PresentationWe shall describe the physics program with tagged forward protons, focusing on Central Exclusive Production (CEP) in polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), with the STAR detector at \sqrt{s} = 200 GeV. Preliminary results in CEP of two oppositely charged pions and kaons produced in the processes $pp\to pp \pi^+\pi^-$ and $pp\to pp \K+\K^-$ shall be...Go to contribution page
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Ms Maria Zurek (FZ Jülich)05/10/2015, 16:50Diffraction and PomeronOral PresentationExclusive central hadronic systems from hadron collisions result primarily from double pomeron exchange, and these have very restrictive quantum numbers: $I^{G}J^{PC}$ = $0^+ (\text{even})^{++}$. This "quantum number filter" is a powerful tool for meson spectroscopy in the isoscalar sector, especially for glue-rich states. In addition it provides information on the nature of the pomeron. We...Go to contribution page
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Dr Alice Valkarova (Institute of Particle and Nucelar Physics, Charles University)05/10/2015, 17:10The exclusive dijet production in diffractive deep inelastic e+- p scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb^{-1}. The measurement was performed for \gamma^*-p centre-of-mass energies in the range 90 < W < 250 GeV and photon virtualities in the range Q^2 > 25 GeV^2. Energy and transverse-energy flows around the jet axis are presented....Go to contribution page
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Prof. Boris Kopeliovich (UFTSM)05/10/2015, 17:30Diffraction and PomeronOral PresentationProduction of heavy photons (Drell-Yan), gauge bosons, Higgs bosons, heavy flavors, which is treated within the QCD parton model as a result of hard parton-parton collision, should be treated as a bremsstrahlung process seeing in the rest frame of the target. The main observation is a dramatic breakdown of diffractive QCD factorization due to the interplay between soft and hard...Go to contribution page