Showing papers by "Kreso Kadija published in 2007"
TL;DR: In this article, the authors present a detailed analysis of the performance of the Large Hadron Collider (CMS) at 14 TeV and compare it with the state-of-the-art analytical tools.
Abstract: CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV at the Large Hadron Collider (LHC). It currently involves more than 2000 physicists from more than 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle physics based on its unprecedented collision energy and luminosity when it begins operation in 2007. The principal aim of this report is to present the strategy of CMS to explore the rich physics programme offered by the LHC. This volume demonstrates the physics capability of the CMS experiment. The prime goals of CMS are to explore physics at the TeV scale and to study the mechanism of electroweak symmetry breaking--through the discovery of the Higgs particle or otherwise. To carry out this task, CMS must be prepared to search for new particles, such as the Higgs boson or supersymmetric partners of the Standard Model particles, from the start-up of the LHC since new physics at the TeV scale may manifest itself with modest data samples of the order of a few fb−1 or less. The analysis tools that have been developed are applied to study in great detail and with all the methodology of performing an analysis on CMS data specific benchmark processes upon which to gauge the performance of CMS. These processes cover several Higgs boson decay channels, the production and decay of new particles such as Z' and supersymmetric particles, Bs production and processes in heavy ion collisions. The simulation of these benchmark processes includes subtle effects such as possible detector miscalibration and misalignment. Besides these benchmark processes, the physics reach of CMS is studied for a large number of signatures arising in the Standard Model and also in theories beyond the Standard Model for integrated luminosities ranging from 1 fb−1 to 30 fb−1. The Standard Model processes include QCD, B-physics, diffraction, detailed studies of the top quark properties, and electroweak physics topics such as the W and Z0 boson properties. The production and decay of the Higgs particle is studied for many observable decays, and the precision with which the Higgs boson properties can be derived is determined. About ten different supersymmetry benchmark points are analysed using full simulation. The CMS discovery reach is evaluated in the SUSY parameter space covering a large variety of decay signatures. Furthermore, the discovery reach for a plethora of alternative models for new physics is explored, notably extra dimensions, new vector boson high mass states, little Higgs models, technicolour and others. Methods to discriminate between models have been investigated. This report is organized as follows. Chapter 1, the Introduction, describes the context of this document. Chapters 2-6 describe examples of full analyses, with photons, electrons, muons, jets, missing ET, B-mesons and τ's, and for quarkonia in heavy ion collisions. Chapters 7-15 describe the physics reach for Standard Model processes, Higgs discovery and searches for new physics beyond the Standard Model
973 citations
TL;DR: In this paper, the capabilities of the CERN Large Hadron Collider (LHC) experiment to explore the rich heavy-ion physics program offered by the LHC are presented, and the potential of the CMS experiment to carry out a series of representative Pb-Pb measurements.
Abstract: This report presents the capabilities of the CMS experiment to explore the rich heavy-ion physics programme offered by the CERN Large Hadron Collider (LHC). The collisions of lead nuclei at energies , will probe quark and gluon matter at unprecedented values of energy density. The prime goal of this research is to study the fundamental theory of the strong interaction ? Quantum Chromodynamics (QCD) ? in extreme conditions of temperature, density and parton momentum fraction (low-x).This report covers in detail the potential of CMS to carry out a series of representative Pb-Pb measurements. These include bulk observables, (charged hadron multiplicity, low pT inclusive hadron identified spectra and elliptic flow) which provide information on the collective properties of the system, as well as perturbative probes such as quarkonia, heavy-quarks, jets and high pT hadrons which yield tomographic information of the hottest and densest phases of the reaction.
361 citations
TL;DR: In this article, the authors used the balance function (BF) method in central Pb+Pb collisions from 20A to 158A GeV to investigate the sensitivity of the BF analysis to the time of hadronization.
Abstract: Results from electric charge correlations studied with the Balance Function (BF) method in A+A collisions from 20A to 158A GeV are presented in two different rapidity intervals: In the midrapidity region we observe a decrease of the width of the BF distribution with increasing centrality of the collision, whereas this effect vanishes in the forward rapidity region. Results from the energy dependence study in central Pb+Pb collisions show that the narrowing of the BF expressed by the normalized width parameter W increases with energy toward the highest CERN Super Proton Synchrotron and BNL Relativistic Heavy Ion Collider energies. Finally we compare our experimental data points with the predictions of several models. The hadronic string models Ultra-relativistic Quantum Molecular Dynamics and Heavy Ion Jet INteraction Generator (HIJING) do not reproduce the observed narrowing of the BF. However, A MultiPhase Transport medel (AMPT), which contains a quark-parton transport phase before hadronization, can reproduce the narrowing of the BF's width with centrality. This confirms the proposed sensitivity of the BF analysis to the time of hadronization.
15 citations
01 Jan 2007
TL;DR: In this paper, the capabilities of the CERN Large Hadron Collider (LHC) experiment to explore the rich heavy-ion physics program offered by the LHC are presented, and the potential of the CMS experiment to carry out a series of representative Pb-Pb measurements.
Abstract: This report presents the capabilities of the CMS experiment to explore the rich heavy-ion physics programme offered by the CERN Large Hadron Collider (LHC). The collisions of lead nuclei at energies , will probe quark and gluon matter at unprecedented values of energy density. The prime goal of this research is to study the fundamental theory of the strong interaction ? Quantum Chromodynamics (QCD) ? in extreme conditions of temperature, density and parton momentum fraction (low-x).This report covers in detail the potential of CMS to carry out a series of representative Pb-Pb measurements. These include bulk observables, (charged hadron multiplicity, low pT inclusive hadron identified spectra and elliptic flow) which provide information on the collective properties of the system, as well as perturbative probes such as quarkonia, heavy-quarks, jets and high pT hadrons which yield tomographic information of the hottest and densest phases of the reaction.
15 citations
12 Mar 2007
7 citations
24 May 2007
TL;DR: In this paper, the authors present a list of the authors of this paper: A.C. Anticic23, T.I. van Leeuwen1, P. Panagiotou2, D. Panayotov17, A.G. Genchev18, G.M. Vassiliou 2, E.L. Chvala 14, J.V.
Abstract: C. Alt9, T. Anticic23, B. Baatar8,D. Barna4, J. Bartke6, L. Betev10, H. Bialkowska20, C. Blume9, B. Boimska20, M. Botje1, J. Bracinik3, R. Bramm9, P. Buncic10, V. Cerny3, P. Christakoglou2, P. Chung19, O. Chvala14, J.G. Cramer16, P. Csato4, P. Dinkelaker9, V. Eckardt13, D. Flierl9, Z. Fodor4, P. Foka7, V. Friese7, J. Gal4, M. Gaździcki9,11, V. Genchev18, G. Georgopoulos2, E. Gladysz6, K. Grebieszkow22, S. Hegyi4, C. Hohne7, K. Kadija23, A. Karev13, D. Kikola22, M. Kliemant9, S. Kniege9, V.I. Kolesnikov8, E. Kornas6, R. Korus11, M. Kowalski6, I. Kraus7, M. Kreps3, A. Laszlo4, R. Lacey19, M. van Leeuwen1, P. Levai4, L. Litov17, B. Lungwitz9, M. Makariev17, A.I. Malakhov8, M. Mateev17, G.L. Melkumov8, A. Mischke1, M. Mitrovski9, J. Molnar4, St. Mrowczynski11, V. Nicolic23, G. Palla4, A.D. Panagiotou2, D. Panayotov17, A. Petridis2, W. Peryt22, M. Pikna3, J. Pluta22, D. Prindle16, F. Puhlhofer12, R. Renfordt9, C. Roland5, G. Roland5, M. Rybczynski11, A. Rybicki6,10, A. Sandoval7, N. Schmitz13, T. Schuster9, P. Seyboth13, F. Sikler4, B. Sitar3, E. Skrzypczak21, M. Slodkowski22, G. Stefanek11, R. Stock9, C. Strabel9, H. Strobele9, T. Susa23, I. Szentpetery4, J. Sziklai4, M. Szuba22, P. Szymanski10,20, V. Trubnikov20, D. Varga4,10, M. Vassiliou2, G.I. Veres4,5, G. Vesztergombi4, D. Vranic7, A. Wetzler9, Z. Wlodarczyk11, A. Wojtaszek11, I.K. Yoo15, J. Zimanyi4
7 citations
Posted Content•
TL;DR: In this paper, the NA49 results on event-by-event transverse momentum fluctuations are presented for central Pb+Pb interactions over the whole SPS energy range (20A - 158A GeV).
Abstract: The latest NA49 results on event-by-event transverse momentum fluctuations are presented for central Pb+Pb interactions over the whole SPS energy range (20A - 158A GeV). Two different methods are applied: evaluating the $\Phi_{p_{T}}$ fluctuation measure and studying two-particle transverse momentum correlations. The obtained results are compared to predictions of the UrQMD model. The results on the energy dependence are compared to the NA49 data on the system size dependence. The NA61 (SHINE, NA49-future) strategy of searching of the QCD critical end-point is also discussed.
4 citations
University of Geneva1, University of Warsaw2, National and Kapodistrian University of Athens3, Saint Petersburg State University4, Joint Institute for Nuclear Research5, Karlsruhe Institute of Technology6, Hungarian Academy of Sciences7, Jagiellonian University8, University of Bari9, Pusan National University10, Stony Brook University11, University of Cape Town12, University of Bern13, Eötvös Loránd University14, Goethe University Frankfurt15, Jan Kochanowski University16, Warsaw University of Technology17, Sofia University18, ETH Zurich19, University of Wisconsin-Madison20, Frankfurt University of Applied Sciences21, University of Bergen22
Journal Article•
TL;DR: The elliptic flow of Lambda hyperons has been measured by the NA49 collaboration at the CERN-SPS in semi-central Pb+Pb collisions at 158A GeV as discussed by the authors.
Abstract: The elliptic flow of Lambda hyperons has been measured by the NA49 collaboration at the CERN-SPS in semi-central Pb+Pb collisions at 158A GeV. The standard method of correlating particles with the event plane was used. Measurements of v2 near mid-rapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with v2 for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behaviour of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at 158A GeV. The limited pT range of the data does not allow for a decisive test of the coalescence model.
Goethe University Frankfurt1, Joint Institute for Nuclear Research2, Hungarian Academy of Sciences3, Polish Academy of Sciences4, CERN5, Comenius University in Bratislava6, National and Kapodistrian University of Athens7, Stony Brook University8, Charles University in Prague9, University of Washington10, Max Planck Society11, Eötvös Loránd University12, GSI Helmholtz Centre for Heavy Ion Research13, Jan Kochanowski University14, Bulgarian Academy of Sciences15, Warsaw University of Technology16, Sofia University17, University of Marburg18, Massachusetts Institute of Technology19, University of Warsaw20, Pusan National University21
TL;DR: D.B. Boimska20, M.I. Chvala14, J. Chung19, O. Genchev18, G. Georgopoulos2, E. Gaździcki9,11, V.K. Kolesnikov8,E.
Abstract: B Boimska20, M Botje1, J Bracinik3, R Bramm9, P Buncic10, V Cerny3, P Christakoglou2, P Chung19, O Chvala14, JG Cramer16, P Csato4, P Dinkelaker9, V Eckardt13, D Flierl9, Z Fodor4, P Foka7, V Friese7, J Gal4, M Gaździcki9,11, V Genchev18, G Georgopoulos2, E Gladysz6, K Grebieszkow22, S Hegyi4, C Hohne7, K Kadija23, A Karev13, D Kikola22, M Kliemant9, S Kniege9, VI Kolesnikov8, E Kornas6, R Korus11, M Kowalski6, I Kraus7, M Kreps3, A Laszlo4, R Lacey19, M van Leeuwen1, P Levai4, L Litov17, B Lungwitz9, M Makariev17, AI Malakhov8, M Mateev17, GL Melkumov8, A Mischke1, M Mitrovski9, J Molnar4, St Mrowczynski11, V Nicolic23, G Palla4, AD Panagiotou2, D Panayotov17, A Petridis2,†, W Peryt22, M Pikna3, J Pluta22, D Prindle16, F Puhlhofer12, R Renfordt9, C Roland5, G Roland5, M Rybczynski11, A Rybicki6, A Sandoval7, N Schmitz13, T Schuster9, P Seyboth13, F Sikler4, B Sitar3, E Skrzypczak21, M Slodkowski22, G Stefanek11, R Stock9, C Strabel9, H Strobele9, T Susa23, I Szentpetery4, J Sziklai4, M Szuba22, P Szymanski10,20, V Trubnikov20, D Varga4,10, M Vassiliou2, GI Veres4,5, G Vesztergombi4, D Vranic7, A Wetzler9, Z Wlodarczyk11, A Wojtaszek11, IK Yoo15, J Zimanyi4,†