Conveners
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
- Raphael Granier De Cassagnac (Ecole Polytechnique, CNRS-IN2P3)
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
- Javier Albacete (IPhT CEA Saclay)
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
- Eduardo Fraga (Universidade Federal do Rio de Janeiro)
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
- Raphael Granier De Cassagnac (Ecole Polytechnique, CNRS-IN2P3)
Matteo Cacciari
(LPTHE Paris)
22/07/2010, 09:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
Jet algorithms cluster final state particles in high energy collisions with the aim of identifying "jets" that can be considered as proxies of the original hard partons, and therefore allow one to study their production mechanism and subsequent evolution. In heavy ion collisions, this task is severely complicated by the huge underlying event that accompanies the hard one: the particle content...
Olga Evdokimov
(University of Illinois at Chicago)
22/07/2010, 09:20
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
One of the most remarkable discoveries of the ongoing heavy ion physics program at RHIC is the experimental observation of the jet quenching. The STAR detector, with its extended angular coverage, has made possible novel studies of jet interactions with QCD matter using angular correlations.
Di- and tri-hadron correlation studies have shown evidence of strong interactions between hard partons...
Chris Pinkenburg
(BNL)
22/07/2010, 09:40
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
Jets from heavy ion collisions provide a measurement of the medium-induced parton energy loss and the in-medium fragmentation properties, and therefore can significantly enhance our understanding of the energy loss mechanism and medium property. The medium modification effects are determined by comparing to a p+p baseline measurement. However the presence of high multiplicity backgrounds in...
Jan Rak
(BNL)
22/07/2010, 10:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
In the first LHC 2009 and 2010 runs ALICE experiment collected about 10 nb-1 at √s=900 GeV and 10 μb-1 at √s=7 TeV of minimum bias p + p events. I will present a first look at the hard scattering phenomena exploring high-pT leading charged hadron correlations. An azimuthal and pseudorapidity correlations are analyzed in order to extract the mean transverse fragmentation momentum <jT> and...
Prof.
Eduardo Fraga
(Instituto de Fisica, Universidade Federal do Rio de Janeiro)
22/07/2010, 10:15
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
The structure of the phase diagram for strong interactions becomes richer in the presence of a magnetic background, which enters as a new control parameter for the thermodynamics, and can exhibit new phases and interesting features. Motivated by the relevance of this physical setting for current and future high-energy heavy ion collision experiments and for the cosmological QCD transitions, we...
Daniel Kikola
(Lawrence Berkeley Nat. Lab./Warsaw Univ. of Technology)
22/07/2010, 11:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
According to lattice QCD calculation, the suppression pattern of quarkonia states is expected to provide insight into thermodynamic properties of hot and dense matter, Quark-Gluon Plasma (QGP), predicted to be created in relativistic heavy ions collisions at RHIC energies. The suppression in this calculation is caused by screening of the binding potential between quark and antiquark in QGP. ...
Alex Linden-Levy
(LLNL)
22/07/2010, 11:20
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
Over the last ten years the PHENIX experiment has continued to increase the amount of recorded and analyzed data available for p+p, d+Au and A+A colliding species at various energies. These data have allowed us to analyze J/ψ mesons in all three collision types which contributes to the understanding of J/ψ formation, suppression in cold nuclear matter and anomolous suppression in heavy ion...
Dr
Javier Castillo Castellanos
(Service de Physique Nucleaire (SPhN))
22/07/2010, 11:40
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. The main purpose of ALICE is to investigate the properties of a state of deconfined nuclear matter, the Quark Gluon Plasma. Heavy flavour measurements will play a crucial role in this investigation. The physics programme of ALICE has started by studying proton-proton collisions at unprecedented high energies.
We will...
Leonid Gladilin
(Moscow State University)
22/07/2010, 12:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
Studies of the long-lived resonances Ks and Lambda, reconstructed in inelastic collisions at 900 GeV and 7 TeV using a minimum bias trigger, have been performed using the ATLAS inner tracking detector. The spectra for these resonances are measured as a function of their transverse momentum and rapidity, and compared with Monte Carlo models. The ratio of anti-Lambda to Lambda production is...
Dr
Tome Anticic
(Rudjer Boskovic Institute)
22/07/2010, 12:15
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
New data on the production of hyperons, as well as of pions, charged kaons, protons, anti-protons, neutrons in p+p interactions are presented. The data come from a sample of 8.2 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum. The high statistics data sample allows the extraction of detailed differential distributions as a function of x_f ,y...
Dr
Javier Albacete
(IPhT-CEA-Saclay)
22/07/2010, 14:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
The Color Glass Condensate is the effective theory of QCD for high energy scattering. The recent theoretical progress achieved through the calculation of next-to-leading order corrections to the small-x renormalization group equations has opened up a period for precision CGC phenomenology. I shall present CGC analyses of experimental data for the inclusive structure functions in...
Dr
Hannu Paukkunen
(University of Santiago de Compostela)
22/07/2010, 14:20
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
The recent global analyses of the nuclear parton distribution functions lend support to the validity of the factorization theorem of QCD in high-energy processes involving bound nucleons. With special attention on the recent global analysis EPS09, we review the latest developements in the domain of nuclear PDFs.
Dr
Cyrille Marquet
(Theory Division - CERN)
22/07/2010, 14:40
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
The STAR collaboration has recently measured the azimuthal correlation function of forward di-pions. The data show a disapearance of the away-side peak in central d+Au collisions, compared to p+p collisions. We argue that this effect, absent at mid-rapidity, is a consequence of the small-x evolution into the saturation regime of the Gold nucleus wave function, and we show that the data can be...
Dr
Michal Sumbera
(Nuclear Physics Institute ASCR-Acad. of Sciences of the Czech Re)
22/07/2010, 14:55
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
We analyze several reactions on nuclear targets at forward rapidities and different energies (at smallest experimentally accessible Bjorken x). Nuclear effects are usually interpreted as a result of shadowing or the Color Glass Condensate. QCD factorization of soft and hard interactions requires the nucleus to be an universal filter for different Fock components of the projectile hadron. We...
Andrei Rostovtsev
(ITEP Institute for Theoretical and Experimental Physics (ITEP)-U)
22/07/2010, 15:10
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
Inclusive non-diffractive photoproduction of ρ(770)º, K*(892)º and φ(1020) mesons is investigated with the H1 detector in ep collisions at HERA. The corresponding average gamma p centre-of-mass energy is 210 GeV. The mesons are measured in the transverse momentum range 0.5 < pT < 7 GeV and the rapidity range |y_lab|<1. Differential cross sections are presented as a function of transverse...
Robi Peschanski
(IPhT, CEA-Saclay)
22/07/2010, 15:25
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
We consider and compare various geometric-scaling solutions of the QCD Balitsky-Kovchegov (BK) equation, for fixed or running QCD coupling.
These solutions predict different scaling variables which we first test with recent DIS cross-section data using the "Quality Factor" method. Then we use a chi^2 method to compare the different predicted parametrisations of the traveling wave...
Frank Krauss
(Durham)
22/07/2010, 16:15
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
In this talk Monte Carlo models for Minimum Bias physics and their corresponding tunes will be confronted with data from the LHC.
Dr
Mercedes Lopez Noriega
(IPNO)
22/07/2010, 16:40
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
We will present the transverse momentum spectra of identified particles measured with the ALICE experiment in proton-proton collisions at LHC recorded at the center-of-mass energies of 0.9 and 7 TeV. The spectra of the charged particles (π± , K± , p and pbar) were obtained measuring the dE/dx in the ALICE TPC and ITS complemented at higher momenta by the time-of-flight information provided by...
Keith Ulmer
(University of Colorado)
22/07/2010, 17:00
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
We report on measurements of hadron production in pp collisions at √s = 0.9, 2.36 and 7 TeV, recorded with the CMS detector. Transverse momentum, pseudorapidity and multiplicity distributions of charged hadrons are presented. For non-single diffractive collisions, the average charged-hadron transverse momentum and pseudorapidity density near mid-rapidity are compared with other measurements in...
Alison Lister
(University of Geneva)
22/07/2010, 17:20
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
The measurement of the properties of proton-proton interactions at center-of-mass energies ranging from 900 GeV (injection energy) to 7 TeV in the ATLAS detector are presented. The charged-particle density, its dependence on transverse momentum and pseudo-rapidity, and the relationship between transverse momentum and charged-particle multiplicity are measured for events with at least one...
Dr
Stefano Lacaprara
(INFN Padova)
22/07/2010, 17:40
08 - Heavy Ion Collisions and Soft Physics at Hadron Colliders
Parallel Session Talk
We present results on two-particle angular correlations in proton-proton collisions over a broad range of pseudorapidity (Δη) and azimuthal angle (Δφ). The data were collected with the CMS detector. A complex two-dimensional correlation structure in Δη and Δφ is observed. In the context of an independent cluster model of short-range correlations, the cluster size and its decay width are...
