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Stano Tokar (Comenius University (SK))26/06/2017, 16:15
A correct modelling of the underlying event in proton-proton collisions is important for the proper simulation of kinematic distributions of high-energy collisions. The ATLAS collaboration extended previous studies at 7 TeV with a leading track or jet or Z boson by a new study at 13 TeV, measuring the number and transverse-momentum sum of charged particles as a function of pseudorapidity and...
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Rajat Gupta (Panjab University (IN))26/06/2017, 16:40
Measurement of Underlying Event activity performed using proton-proton collision data collected by the CMS detector will be presented. To check the energy dependence of Underlying Event activity, the results are compared with previous measurements from different experiments at different center-of-mass energies.
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Speakers -
Mr Patrick Kirchgaesser (Karlsruhe Institute of Technology)26/06/2017, 17:05Soft QCD and soft diffraction
We present a new model for soft interactions in the event-generator Herwig. The model consists of two components. One to model diffractive final states on the basis of the cluster hadronization model and a second component that addresses soft multiple interactions as multiple particle production in multiperipheral kinematics. We present much improved results for minimum-bias measurements at...
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Qidong Zhou (S)26/06/2017, 17:30Soft QCD and soft diffraction
LHC forward (LHCf) is an experiment dedicated to afford the data for verifying and
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improving the hadronic interaction models. The LHCf detectors were installed at +/-
140m from the ATLAS interaction point, covered the pesudorapidity range |η|>8.4
including zero degree. LHCf had several operations with different collision energies in p-p and p-Pb collisions.In this talk, we would like to... -
jan olsson (D)26/06/2017, 17:55Soft QCD and soft diffraction
A first measurement is presented of exclusive photoproduction of ρ0 mesons associated with leading neutrons at HERA. The data were taken with the H1 detector at a centre-of-mass energy of sqrt(s)=319 GeV and correspond to an integrated luminosity of 1.16 pb−1. The ρ mesons are reconstructed from their decays to charged pions, the neutrons are detected in the Forward...
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Andre Martin (Unknown)28/06/2017, 10:50Elastic scattering and total cross section
We prove under some "reasonable" assumptions that the pion pion inelastic cross-section is larger than C exp(-C'sqrt{s} ln s)
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Dr Piotr Lebiedowicz (Institute of Nuclear Physics Polish Academy of Sciences)28/06/2017, 11:13
We discuss central exclusive diffractive dihadron production in the reactions $pp \to pp \,\pi^{+} \pi^{-}$, $pp \to pp \,K^{+} K^{-}$ and $pp \to pp \,p \bar{p}$. The calculation is based on a tensor pomeron model and the amplitudes for the processes are formulated in an effective field-theoretic approach [1]. We include a purely diffractive dipion continuum, and the scalar and tensor...
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Maciej Trzebinski (Polish Academy of Sciences (PL))28/06/2017, 11:36Soft QCD and soft diffraction
The possibilities of the GenEx Monte Carlo generator will be shown. This tool is being developed by our group and is complementary to the existing MC generators. The generator is self-adapting to the provided matrix element and acceptance cuts. The modular structure of the code, designed for easy process implementation, will be shown. As an example, the exclusive production of pions (continuum...
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Giulia Pancheri (INFN Frascati)28/06/2017, 11:59
Recent results for the total, elastic and inelastic hadronic cross-section from LHC experiments will be compared with predictions from one-channel eikonal mini-jet models, with QCD calculations from Durham and Telaviv groups, and with empirical models based on Regge-type parametrizations, adequately implemented with the very small $|t|$ behavior. The role of soft gluon resummation in the...
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Mr Sergey Ostapchenko (FIAS)28/06/2017, 12:22
Rapidity gap survival factors are calculated in the Reggeon Field Theory
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framework. In particular, the relative roles of eikonal and non-eikonal
absorptive corrections are investigated. Further, the impact parameter
dependence of rapidity gap suppression is studied, paying a special attention
to the effects of colour fluctuations in protons. -
Soft QCD and soft diffraction
We shall present preliminary results of the physics program with tagged forward protons with the STAR detector at RHIC. The results were obtained in proton-proton collisions at the √s = 200 GeV, with 18 pb−1 of data. The forward protons are detected in the Roman Pots while the recoil system is measured in the central detector of STAR whose two major systems for this program are the Time...
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John Dainton (The Cockcroft Institute)
Progress is reported with a new phenomenological analysis in full view of chromodynamics of measurements of exclusive elastic (ep->eVMp) and dissociative electroproduction (ep->eVMN) cross sections for the production of vector-meson (VM) “quarkonia” of different flavour, namely
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rho(760), phi(1019), J/Psi and Y(9460). First results are presented of an acceptable fit to all measurements of...
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