Advances in Quark Gluon Plasma
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CERN Courier–Digital Edition
CERNMarch/April 2021 cerncourier.com COURIERReporting on international high-energy physics WELCOME CERN Courier – digital edition Welcome to the digital edition of the March/April 2021 issue of CERN Courier. Hadron colliders have contributed to a golden era of discovery in high-energy physics, hosting experiments that have enabled physicists to unearth the cornerstones of the Standard Model. This success story began 50 years ago with CERN’s Intersecting Storage Rings (featured on the cover of this issue) and culminated in the Large Hadron Collider (p38) – which has spawned thousands of papers in its first 10 years of operations alone (p47). It also bodes well for a potential future circular collider at CERN operating at a centre-of-mass energy of at least 100 TeV, a feasibility study for which is now in full swing. Even hadron colliders have their limits, however. To explore possible new physics at the highest energy scales, physicists are mounting a series of experiments to search for very weakly interacting “slim” particles that arise from extensions in the Standard Model (p25). Also celebrating a golden anniversary this year is the Institute for Nuclear Research in Moscow (p33), while, elsewhere in this issue: quantum sensors HADRON COLLIDERS target gravitational waves (p10); X-rays go behind the scenes of supernova 50 years of discovery 1987A (p12); a high-performance computing collaboration forms to handle the big-physics data onslaught (p22); Steven Weinberg talks about his latest work (p51); and much more. To sign up to the new-issue alert, please visit: http://comms.iop.org/k/iop/cerncourier To subscribe to the magazine, please visit: https://cerncourier.com/p/about-cern-courier EDITOR: MATTHEW CHALMERS, CERN DIGITAL EDITION CREATED BY IOP PUBLISHING ATLAS spots rare Higgs decay Weinberg on effective field theory Hunting for WISPs CCMarApr21_Cover_v1.indd 1 12/02/2021 09:24 CERNCOURIER www. -
Surprises from the Search for Quark-Gluon Plasma?* When Was Quark-Gluon Plasma Seen?
Surprises from the search for quark-gluon plasma?* When was quark-gluon plasma seen? Richard M. Weiner Laboratoire de Physique Théorique, Univ. Paris-Sud, Orsay and Physics Department, University of Marburg The historical context of the recent results from high energy heavy ion reactions devoted to the search of quark-gluon plasma (QGP) is reviewed, with emphasis on the surprises encountered. The evidence for QGP from heavy ion reactions is compared with that available from particle reactions. Keywords: Quark-Gluon plasma in particle and nuclear reactions, hydrodynamics, equation of state, confinement, superfluidity. 1. Evidence for QGP in the Pre-SPS Era Particle Physics 1.1 The mystery of the large number of degrees of freedom 1.2 The equation of state 1.2.1 Energy dependence of the multiplicity 1.2.2 Single inclusive distributions Rapidity and transverse momentum distributions Large transverse momenta 1.2.3 Multiplicity distributions 1.3 Global equilibrium: the universality of the hadronization process 1.3.1 Inclusive distributions 1.3.2 Particle ratios -------------------------------------------------------------------------------------- *) Invited Review 1 Heavy ion reactions A dependence of multiplicity Traces of QGP in low energy heavy ion reactions? 2. Evidence for QGP in the SPS-RHIC Era 2.1 Implications of observations at SPS for RHIC 2.1.1 Role of the Equation of State in the solutions of the equations of hydrodynamics 2.1.2 Longitudinal versus transverse expansion 2.1.3 Role of resonances in Bose-Einstein interferometry; the Rout/Rside ratio 2.2 Surprises from RHIC? 2.2.1 HBT puzzle? 2.2.2 Strongly interacting quark-gluon plasma? Superfluidity and chiral symmetry Confinement and asymptotic freedom Outlook * * * In February 2000 spokespersons from the experiments on CERN’s Heavy Ion programme presented “compelling evidence for the existence of a new state of matter in which quarks, instead of being bound up into more complex particles such as protons and neutrons, are liberated to roam freely…”1. -
Slides Lecture 1
Advanced Topics in Particle Physics Probing the High Energy Frontier at the LHC Ulrich Husemann, Klaus Reygers, Ulrich Uwer University of Heidelberg Winter Semester 2009/2010 CERN = European Laboratory for Partice Physics the world’s largest particle physics laboratory, founded 1954 Historic name: “Conseil Européen pour la Recherche Nucléaire” Lake Geneva Proton-proton2500 employees, collider almost 10000 guest scientists from 85 nations Jura Mountains 8.5 km Accelerator complex Prévessin site (approx. 100 m underground) (France) Meyrin site (Switzerland) Probing the High Energy Frontier at the LHC, U Heidelberg, Winter Semester 09/10, Lecture 1 2 Large Hadron Collider: CMS Experiment: Proton-Proton and Multi Purpose Detector Lead-Lead Collisions LHCb Experiment: B Physics and CP Violation ALICE-Experiment: ATLAS Experiment: Heavy Ion Physics Multi Purpose Detector Probing the High Energy Frontier at the LHC, U Heidelberg, Winter Semester 09/10, Lecture 1 3 The Lecture “Probing the High Energy Frontier at the LHC” Large Hadron Collider (LHC) at CERN: premier address in experimental particle physics for the next 10+ years LHC restart this fall: first beam scheduled for mid-November LHC and Heidelberg Experimental groups from Heidelberg participate in three out of four large LHC experiments (ALICE, ATLAS, LHCb) Theory groups working on LHC physics → Cornerstone of physics research in Heidelberg → Lots of exciting opportunities for young people Probing the High Energy Frontier at the LHC, U Heidelberg, Winter Semester 09/10, Lecture 1 4 Scope -
Deconfinement and Chiral Transition in Ads/QCD Wall Models
EPJ Web of Conferences 137, 03006 (2017) DOI: 10.1051/ epjconf/201713703006 XIIth Quark Confinement & the Hadron Spectrum Deconfinement and chiral transition in AdS/QCD wall models supplemented with a magnetic field David Dudal1;2;a, Diego R. Granado3;b, and Thomas G. Mertens4;2;c 1KU Leuven Campus Kortrijk - KULAK, Department of Physics, Etienne Sabbelaan 51 bus 7800, 8500 Kor- trijk, Belgium 2Ghent University, Department of Physics and Astronomy, Krijgslaan 281-S9, 9000 Gent, Belgium 3Departamento de Física, Universidade Federal Rural do Rio de Janeiro, BR 465-07, 23890-971, Seropédica, RJ, Brasil 4Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA Abstract. We discuss the phenomenon of (inverse) magnetic catalysis for both the de- confinement and chiral transition. We discriminate between the hard and soft wall model, which we suitably generalize to include a magnetic field. Our findings show a critical de- confinement temperature going down, in contrast with the chiral restoration temperature growing with increasing magnetic field. This is at odds with contemporary lattice data, so the quest for a holographic QCD model capable of capturing inverse magnetic catalysis in the chiral sector remains open. 1 Introduction The ongoing heavy ion collision programs (ALICE or RHIC) provide a fertile testing ground for novel experimental, phenomenological and theoretical features of strongly coupled QCD. During the early stages after the collision, a sufficiently hot heat bath is created that leads to the creation of a quark- gluon plasma, an exotic state of deconfined QCD matter. In units of the fundamental QCD scale, ΛQCD, the transition temperature Tdecon f ∼ ΛQCD, so the relevant physics is still strongly coupled. -
Highlights from ALICE
Highlights from ALICE Michael Weber for the ALICE Collaboration Quark Matter, Wuhan, 04-09 Nov 2019 Michael Weber (SMI) Opening the doors (December 2018) CERN-PHOTO-201812-335 2 Quark Matter, Wuhan, 04-09 Nov 2019 Michael Weber (SMI) Soon after CERN-PHOTO-201903-053 Quark Matter, Wuhan, 04-09 Nov 2019 Michael Weber (SMI) 3 Harvest of the past ten years Recorded L System Year(s) √s (TeV) int NN (for muon triggers) 2010,2011 2.76 ~75 μb-1 Pb–Pb 2015 5.02 ~0.25 nb-1 2018 5.02 ~0.55 nb-1 Xe–Xe 2017 5.44 ~0.3 μb-1 2013 5.02 ~15 nb-1 p–Pb 2016 5.02, 8.16 ~3 nb-1; ~25 nb-1 New for QM 2019: ~200 μb-1; ~100 nb-1; 2009-2013 0.9,2.76,7,8 ~1.5 pb-1; ~2.5 pb-1 ● Full 13 TeV pp data set with high-multiplicity triggers pp ● 2018 Pb-Pb with central and semi-central triggers 2015,2017 5.02 ~1.3 pb-1 ● Selected results out of 26 parallel talks, 2015-2018 13 ~36 pb-1 68 posters, and 18 new papers Labels used in this presentation: New since last QM New New preliminary for QM Final On arXiv for QM Quark Matter, Wuhan, 04-09 Nov 2019 Michael Weber (SMI) 4 Outline Initial state → Hadronic structure and photoproduction QGP - Macroscopic properties → Properties of QCD matter and the transition between phases QGP - Microscopic dynamics → Degrees of freedom at each stage and their interactions Small systems → Unified picture of QCD particle production from small to larger systems Hadron physics → LHC as laboratory for hadron interaction studies Following the open questions in the HL-LHC WG5 yellow report Quark Matter, Wuhan, 04-09 Nov 2019 Michael Weber (SMI) 5 ALICE parallel talks Initial state ● Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC S. -
Excited Hadron States and the Deconfinement Transition
Excited Hadron States and the Deconfinement Transition Concluding Discussion Berndt Müller (Duke University) Workshop*) JLab - February 23-25, 2011 Friday, February 25, 2011 If we would hold a follow-up workshop in 2 years from now, which questions would we like to be answered? 2 Friday, February 25, 2011 Which QCD model describes the hadron (meson, baryon) spectrum best? E.g.: Constituent quark model MIT bag model Flux-tube model Holographic dual models Large Nc expansion Is there a “constituent gluon” model? If yes, how do we understand the large gluon mass? Scale breaking by the trace anomaly? Additional spontaneous scale invariance breaking? Is the constituent gluon a flux tube excitation? 3 Friday, February 25, 2011 What is the relation between the deconfinement transition and the chiral transition? Is it a well defined question? Are they at the “same” temperature? Do they drive each other? Where (at what T) and why does the hadron resonance gas model fail? Do unknown hadron states (hybrids, tetraquarks, glueballs) contribute significantly in the range of validity? If yes, which ones? 4 Friday, February 25, 2011 What are the requirements for a valid description of the hadronic break-up of the quark-gluon plasma? How must viscous hydrodynamics be matched to a kinetic description of the hadron gas? What are the minimal matching conditions? In which temperature range can the matching be performed? What are the most sensitive experimental tests? Where does the hot glue in the quark-gluon plasma go? Does it fragment into quark pairs? Does it initially end up in gluonic excitations? Is it possible to measure the average amount of excited glue in hadrons for a given mass or temperature on the lattice? 5 Friday, February 25, 2011 Can finite temperature lattice calculations determine average aspects of the hadron spectrum? Analogy with the Monte-Carlo shell model of Koonin, Ormand, Dean, Langanke, et al, who used MC methods to obtain level densities and Gamov-Teller strengths in the shell model for complex nuclei (e.g. -
Heavy-Ion Collisions at the Dawn of the Large Hadron Collider Era
Heavy-Ion Collisions at the Dawn of the Large Hadron Collider Era J. Takahashi Universidade Estadual de Campinas, São Paulo, Brazil Abstract In this paper I present a review of the main topics associated with the study of heavy-ion collisions, intended for students starting or interested in the field. It is impossible to summarize in a few pages the large amount of information that is available today, after a decade of operations of the Relativistic Heavy Ion Collider and the beginning of operations at the Large Hadron Collider. Thus, I had to choose some of the results and theories in order to present the main ideas and goals. All results presented here are from publicly available references, but some of the discussions and opinions are my personal view, where I have made that clear in the text. 1 Introduction In this very exciting field of science, we use particle accelerators to collide heavy ions such as lead or gold nuclei, instead of colliding single protons or electrons. By doing so, we produce a much more violent collision in which a large number of particles are created and a considerable amount of energy is deposited in a volume bigger than the size of a single proton. As a result, a highly excited state of matter is created, and this state can have characteristics different from those of regular hadronic matter. It is postulated that, if the energy density is high enough, the system formed will be in a state where quarks and gluons are no longer confined into hadrons and thus exhibit partonic degrees of freedom [1,2]. -
Femtoscopy of Proton-Proton Collisions in the ALICE Experiment
Femtoscopy of proton-proton collisions in the ALICE experiment DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Nicolas Bock, B.Sc. B.Eng., M.Sc. Graduate Program in Physics The Ohio State University 2011 Dissertation Committee: Professor Thomas J. Humanic, Advisor Professor Michael Lisa #1 Professor Klaus Honscheid #2 Professor Richard Furnstahl #3 c Copyright by Nicolas Bock 2011 Abstract The Large Ion Collider Experiment (ALICE) at CERN has been designed to study matter at extreme conditions of temperature and pressure, with the long term goal of observing deconfined matter (free quarks and gluons), study its properties and learn more details about the phase diagram of nuclear matter. The ALICE experiment provides excellent particle tracking capabilities in high multiplicity proton-proton and heavy ion collisions, allowing to carry out detailed research of nuclear matter. This dissertation presents the study of the space time structure of the particle emission region, also known as femtoscopy, in proton- proton collisions at 0.9, 2.76 and 7.0 TeV. The emission region can be characterized by taking advantage of the Bose-Einstein effect for identical particles, which causes an enhancement of produced identical pairs at low relative momentum. The geometry of the emission region is related to the relative momentum distribution of all pairs by the Fourier transform of the source function, therefore the measurement of the final relative momentum distribution allows to extract the initial space-time characteristics. Results show that there is a clear dependence of the femtoscopic radii on event multiplicity as well as transverse momentum, a signature of the transition of nuclear matter into its fundamental components and also of strong interaction among these. -
Lambda and Anti-Labmda Production in the ALICE Experiment at the LHC
LLNL-TR-643836 Lambda and Anti-Labmda production in the ALICE experiment at the LHC. R. Carmona, R. Soltz September 12, 2013 Disclaimer This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Livermore National Security, LLC, and shall not be used for advertising or product endorsement purposes. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Strangeness Production in Jets with ALICE at the LHC Rodney Carmona, Mike Tyler II, Ron Soltz, Austin Harton, Edmundo Garcia Chicago State University, Lawrence Livermore National Laboratory Cern (European Organization for Nuclear Research) At this laboratory Physicists and Engineers study fundamental particles using the world’s largest and most complex instruments. Here particles are made to collide at close to the speed of light to see how they interact and help to discover the basic laws of nature. -
Nora Brambilla Quark Confinement and the Hadron Spectrum
Quark Confinement and the Hadron Spectrum XII Nora Brambilla Nora Brambilla Thessaloniki, 28 TU MUNICH August-4 September TU Munich 2016 4el Much of the way in which we develop science Aristotele’s apprehension of reality Aristotele’ school TIMES changed …… Conf12 venue but other things resisted the time the beauty of the place but other things resisted the time the temper, the determination and the ambition of the “locals” Modern Heros that organised 10 days of conference(s) with 400 participants, hundreds of talks, 7 sessions running in parallel , a social event each night and…. almost NO FUNDS ! and what allowed to surpass any difficulty was.. to have as Chair a true descendant of Cleopatra with the same inherited personality We can say that the Quark Confinement Conference shares some of the important Macedonian footprints • “Many different nations, cultures, languages.... “Macedoin” now means “a mix” We have the ambition to bring together all the people dealing with strong interactions from one perspective or the other Scientific Sessions of the conference Section A: Vacuum Structure and Confinement Mechanisms of quark confinement (vortices, monopoles, calorons...) and the structure of the vacuum in non-Abelian gauge theories. Chiral symmetry breaking, and the Dirac spectrum in the low-momentum region. Studies of ghost and gluon propagators. Confining strings and flux tubes, their effective actions. Renormalons and power corrections. Interface between perturbative and non-perturbative physics. Conveners: D. Antonov (Heidelberg), M. Faber (TU Vienna), J. Greensite (San Francisco State U) Focus Subsection: Emergent gauge fields and chiral fermions Chiral Fermions and anomalous hydrodynamic effects in condensed matter systems, quantum simulators of QCD, topological phenomena in condensed matter systems. -
Arxiv:2011.01466V2 [Hep-Lat] 28 Dec 2020
Deconfinement and Hadron Resonance Gas for Heavy ∗ Quarks Peter Petreczky Physics Deparment, Brookhaven National Laboratory, Upton, NY 11973, USA I discuss the deconfinement transition in 2+1 flavor QCD in terms of Polyakov loops as well as the hadron resonance gas for hadrons containing static quarks and charm quarks. PACS numbers: 12.38.Gc,12.38.Mh,25.75.Nq 1. Introduction Heavy quarks and infinitely heavy (static) quarks play an important role when discussing deconfinement transition in strongly interacting matter at high temperatures. The early works on deconfinement considered the free energy of static quark Q as well as the free energy of static quark antiquark (QQ¯) pair [1, 2, 3] and the lattice calculations of these quantities was a focus of many works, see Ref. [4] for a historic review. Deconfinement is closely related to color screening. The production rate of quarkonia, bound states of a heavy quark and anti-quark, was suggested as a probe of deconfinement in heavy ion collisions [5]. The basic idea behind this proposal was that the color screening in the deconfined medium effects the binding of heavy quarks (see also Ref. [6] for a review). Recent lattice QCD studies, however, mostly focus on the chiral aspects of the transition at high temperature, see e.g. Refs. [7, 8] for recent reviews. In this contribution I will discuss the deconfinement in 2+1 flavor QCD with (almost) physical quark masses in arXiv:2011.01466v2 [hep-lat] 28 Dec 2020 terms of Polyakov loops in different renormalization schemes. The Hadron Resonance Gas (HRG) model has been used to understand the thermodynamics below the cross-over temperature for many years [9, 10, 11, 12, 12, 13, 14, 15, 16]. -
Exhibiting the Alice Experiment
EXHIBITING THE ALICE EXPERIMENT LHCP2017, Shanghai, 15.5.2017 Despina Hatzifotiadou INFN Bologna On behalf of the ALICE Collaboration LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 1 ALICE : OUTREACH AND COMMUNICATION TOOLS AND METHODS Events: Open Days, European Researchers Night Public talks Visits International Particle Physics Masterclasses http://alicematters.web.cern.ch/ https://twitter.com/ALICEexperiment https://www.facebook.com/ALICE.EXPERIMENT Virtual visits LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 2 VISITS Highlights : underground visits • During LS1 > 15000 visitors • >7000 first year of LS1 • Open Days Sept. 2013 ~3500 • Possible only during limited periods Surface visitors’ centre a necessity • Also complementary to cavern visit LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 3 ALICE VISITORS’ CENTRE Real-size poster of ALICE cross section • Explain basic ALICE components ARC (ALICE Run Control Centre) • Explain LHC operation, data taking • See physicists at work Interactive Window at ARC • Describe ALICE / its components • ALICE sociology VIEW OF SHAFT, PAD, MAD NEW ALICE EXHIBITION LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 4 ALICE INTERACTIVE WINDOW LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 5 ALICE INTERACTIVE WINDOW LHCP2017, Shanghai, 15.5.17 Despina Hatzifotiadou - Exhibiting the ALICE experiment 6 ALICE INTERACTIVE