Conveners
WG2+WG4 Joint Session: Small-x, Diffraction and Vector Mesons + QCD and Hadronic Final States
- Mario Deile (CERN)
- Stephane Munier (Ecole polytechnique)
- Konstantinos Kousouris (CERN)
- Daniel Britzger (Deutsches Elektronen-Synchrotron (DE))
- Lidia Maria Gorlich (Polish Academy of Sciences (PL))
- Vladimir Braun (University of Regensburg)
Prof.
Jacek Turnau
(Institute of Nuclear Physics, PAN, Cracow)
30/04/2014, 08:30
WG2+WG4 Joint Session
Oral presentation
We shall present preliminary measurement of the Central Exclusive Production
of the two oppositely charged pions produced in the process $pp->pXp$
, obtained with the STAR detector at RHIC
at $\sqrt(s)$ = 200 GeV. The Roman Pots were used to tag forward protons
while pion pair tracks were reconstructed in the STAR Time Projection Chamber (TPC).
Spectra of the kinematical...
Piotr Lebiedowicz
(Institute of Nuclear Physics PAN)
30/04/2014, 08:50
WG2+WG4 Joint Session
Oral presentation
We discuss exclusive central diffractive production of scalar
($f_{0}(980)$, $f_{0}(1370)$, $f_{0}(1500)$),
pseudoscalar ($\eta$, $\eta'(958)$),
and vector ($\rho^{0}$) mesons in proton-proton collisions.
The amplitudes are formulated in terms of
effective vertices required to respect standard rules of Quantum Field Theory
and propagators for the exchanged pomeron and reggeons...
Andrei Minaenko
(Institute for High Energy Physics (RU))
30/04/2014, 09:10
WG2+WG4 Joint Session
Oral presentation
Particle distributions sensitive to the underlying even have been measured with the
ATLAS detector at the LHC. Charged particle multiplicity, charged and inclusive sum transverse momentum (pT) densities and mean charged-particle pT in the regions of each event, azimuthally transverse to the hardest jet, are also presented.
When compared to the predictions of different Monte Carlo models,...
Mr
Tomasz Maciej Frueboes
(National Centre for Nuclear Research (PL))
30/04/2014, 09:30
WG2+WG4 Joint Session
Oral presentation
A measurement of the underlying event activity is performed on proton-proton collisions, for different centre-of-mass energies, using the CMS detector. The charged particles in the azimuthal region transverse to the leading track and the leading track jet at central pseudorapidities are studied. The measurements are compared with various theoretical predictions. A significant increase in the...
Paolo Gunnellini
(Deutsches Elektronen-Synchrotron (DE))
30/04/2014, 09:50
WG2+WG4 Joint Session
Oral presentation
New UE event tunes, based on measurements done at 7 TeV as well as at lower energies together with Tevatron measurements are presented. Especially the energy dependent parameters of the UE are better constrained, allowing for extrapolation to 13-14 TeV. The new tunes are compared to measurements of Double Parton Scattering and the consistency of the tunes is investigated.
Anastasia Grebenyuk
(Universite Libre de Bruxelles (BE))
30/04/2014, 11:00
WG2+WG4 Joint Session
Oral presentation
Double parton scattering is investigated in proton-proton collisions at sqrt(s) = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated luminosity of 5 fb^(-1), collected with the CMS detector at the LHC. Observables sensitive to double parton scattering are investigated after being corrected for...
Rafal Maciula
(Institute of Nuclear Physics PAN)
30/04/2014, 11:20
WG2+WG4 Joint Session
Oral presentation
We discuss production of four-jet final state in the $pp \rightarrow j j j j X$ reaction at the LHC through the mechanism of double-parton scattering (DPS) [1].
Each step of the DPS is calculated within the so-called factorized Ansatz in the LO collinear approximation. The LO pQCD calculations are shown to give a reasonably good descritption of the recent CMS and ATLAS data on inclusive jet...
Mr
Bertrand Ducloue
30/04/2014, 11:40
WG2+WG4 Joint Session
Oral presentation
The study of the production of two forward jets with a large interval of rapidity at hadron colliders was proposed by Mueller and Navelet as a possible test of the high energy dynamics of QCD. We analyze this process within a complete next-to-leading logarithm framework, supplemented by the use of the Brodsky-Lepage-Mackenzie procedure extended to the perturbative Regge dynamics, to find the...
Grigory Safronov
(ITEP Institute for Theoretical and Experimental Physics (RU))
30/04/2014, 12:00
WG2+WG4 Joint Session
Oral presentation
We present searches for beyond-DGLAP resummation effects in production of dijets with large rapidity separation in pp collisions at sqrt{s}=7TeV. Ratios of inclusive over exclusive dijet production cross sections and dijet azimuthal decorrelations are presented as a function of rapidity separation between jets. Measurements are compared to predictions of conventional LO+PS MC generators as...
