School Celebrates Young Physicists

Total Page:16

File Type:pdf, Size:1020Kb

School Celebrates Young Physicists FACES AND PLACES ERICE School celebrates young physicists Lecturers and young physicists from all over the world met in Erice from 29 August to 7 September. The event was the 2006 International School of Subnuclear Physics held at the Ettore Majorana Foundation and Centre for Scientific Culture, a particular feature of which is to promote “new talents” among the young generation of physicists. The 44th in the series, the 2006 school covered some of the most advanced topics in physics under the theme “The logic of nature, complexity and new physics: from quark–gluon plasma to superstrings, quantum gravity and beyond”. The novel Lecturers and students at the 2006 International School of Subnuclear Physics. topic of complexity could shed new light on the Standard Model and the extension Standard Model. Complementary lectures in talks on the latest plans for a “super- that predicts grand unification and the on complexity and landscape in string beauty” project; the preparations for the resolution of the quantum-gravity problem theory and on the status of lattice quantum International Linear Collider and Compact via relativistic quantum string theory chromodynamics (QCD) triggered lively Linear Collider; start-up and upgrade (RQST). The most popular model of RQST, discussions during the afternoon sessions. scenarios for the LHC; and the future of developed by Raphael Bousso and Joe Other theory lectures included topics such supercomputers by Roberto Petronzio of the Polchinski at Stanford, has been shown to as complexity and non-extensive statistical University of Rome II and INFN. be “NP complete”. The consequences could mechanics; complexity in stochastically Closing lectures by ’t Hooft and Zichichi be remarkable. quantized field theories and the Standard looked forward to the LHC. Experiments there Organized and directed by Nobel laureate Model; QCD at low energy; how to detect should confirm current theories beyond the Gerardus ’t Hooft together with Antonino extra dimensions; and black holes, Standard Model, but may also yield some Zichichi, the school followed the traditional attractors and quantum information. totally unexpected discoveries. Referring model of morning lectures on the most Closer to experimental physics, Haim to the interpretation of data from RHIC up-to-date topics in subnuclear physics, Harari of the Weizmann Institute presented and the ALICE experiment at LHC, Zichichi followed by afternoon sessions dedicated an excellent overview – “Neutrino masses, presented an example of how to look for the to the new talents and recipients of Enrico leptogenesis and beyond: the incredible unexpected. Together with his collaborators Fermi junior grants. During these sessions foresight of Ettore Majorana”. This was very he is studying an experimental set-up to allow selected students at the school could make timely, as during the school the director of the the quark–gluon coloured world (QGCW) to be open presentations about their research. Gran Sasso National Laboratories, Eugenio investigated with a hard-scattering probe. The Each session was followed by a discussion Coccia, outlined details of neutrino-oscillation idea is that a beam of particles bombards the of the lectures held during the morning. experiments at the start-up of the CERN QGCW during its brief existence in heavy-ion The school was dedicated to the late neutrino beam to Gran Sasso (see p20). collisions at the LHC, and special detectors Richard Dalitz. A former collaborator, Gary Reports from running experiments covered measure the scattered particles. Goldstein at Tufts University, talked about the latest results on B-physics, the physics The school ended in a festive atmosphere, Dalitz’s contributions to particle physics in a at Fermilab’s Tevatron and results from HERA celebrating the 60th birthday of its director, lecture in his honour. at DESY. Yale’s John Harris presented the ’t Hooft, and the distribution of diplomas to “Complexity exists at the fundamental American Institute of Physics’ “top physics the young talents. The 2006 prize for the level” was the theme of the opening lecture story of 2005” in his animated lectures best student went to Yasuko Hisamatsu of by Zichichi, followed by a series of lectures on evidence for a quark–gluon plasma at the University of Tokyo for her presentation by Leonard Susskind of Stanford, who the Relativistic Heavy Ion Collider (RHIC) on the MEG experiment under preparation at addressed the most advanced theories on at Brookhaven. He outlined the present the Paul Scherrer Institute, which will probe “Landscape and its physics foundations” understanding of the “quark–gluon liquid” physics at the grand-unification scale. and “How string theory generates the and highlighted the need for experiments at Report from Horst Wenninger, CERN. landscape”. These lectures summarized the Large Hadron Collider (LHC). ● For further information see www.ccsem. the latest news on physics beyond the A preview of the future was contained infn.it/issp2006/index.html. 42 CERN Courier November 2006 CCENovFaces42to44,46to48.indd 42 17/10/06 16:10:48 FACES AND PLACES LABORATORIES UK opens two major centres for particle-accelerator research Two major research centres for accelerator science and technology opened in the UK on 19 September. The Cockcroft Institute and the John Adams Institute will be national focal points for UK scientists and companies to develop leading accelerator technologies for major projects such as the International Linear Collider and a neutrino factory. The Cockcroft Institute and the John Adams Institute were set up by the Particle Physics and Astronomy Research Council in partnership with the Council for the Central Laboratory of the Research Councils. The aim is to provide the facilities and infrastructure for research and training in accelerator science and engineering. The two institutes are already heavily involved in the research and development needed for future high-energy, high-intensity linear colliders as well as for the construction of new high-intensity neutrino sources. Lord Sainsbury (central with a blue shirt) with members of the Cockroft Institute from The Cockcroft Institute is located on the Lancaster University at a demonstration of a prototype RF cavity. new Daresbury Science and Innovation Campus and is a joint venture between the two research councils, the universities of Liverpool, Lancaster and Manchester, and the Northwest Regional Development Agency. The John Adams Institute is located at both the University of Oxford and Royal Holloway, University of London, and is a partnership between those two universities and the two research councils. The Cockcroft Institute was officially opened by Lord Sainsbury, minister for science and innovation, in the presence of the children of Sir John Cockcroft, the Nobel prize-winner and one of the founders of modern accelerator research. After the opening ceremony, Sainsbury spent time with the staff in the laboratories discussing The unveiling of the plaque celebrating the opening of the John Adams Institute, with Ken demonstrations of current R&D on RF Peach (left) and Christopher Adams (right). (Courtesy Oxford Physics.) systems, vacuum science and engineering, design simulation, and theoretical designer and engineer Sir John Adams who Shinzel, also spoke at the ceremony, as well accelerator physics. was twice director-general of CERN and a as former CERN director-general Sir Chris The John Adams Institute was opened by leading figure in the construction of CERN’s Llewellyn Smith and Lyn Evans, head of the Christopher Adams, son of the accelerator major accelerators. Sir John’s daughter, Josi Large Hadron Collider project at CERN. CERN Courier November 2006 43 CCENovFaces42to44,46to48.indd 43 17/10/06 16:11:24 FACES AND PLACES WORKSHOPS Physicists return to Tbilisi for hadron update The possibility of polarizing antiprotons at the upcoming Facility for Antiproton and Ion Research at GSI has stimulated widespread interest within the hadron community. Measuring the Drell–Yan process in high- energy proton–antiproton collisions offers the best way to study the transverse spin structure of protons (transversity). This was the focus at the second Caucasian- German School and Workshop on Hadron Physics (CGSWHP) in Tbilisi, Georgia, on 4–8 September. Around 70 participants attended, from nine countries. Spin filtering, in which a beam of Participants take a break from spin matters during an outing at CGSWHP’06 in Georgia. antiprotons acquires polarization by repeated passage through a polarized polarized beams and targets. Results from project, Hadron Physics, supported the hydrogen target, is believed to be the COSY were also presented at the meeting. workshop, which had the theme Spin most effective means of producing a Georgian media covered several sessions, in Hadron Physics and which was also useful beam for transversity experiments. as well as the meeting of the organizers with sponsored by Forschungszentrum Jülich, the CGSWHP’06 discussed preparatory spin- the rector of Tbilisi State University, and International Science & Technology Center, filtering tests using proton beams. These some of the social programme. TV interviews the Joint Institute for Nuclear Research and could be at Cooler Synchrotron (COSY) at publicized the workshop, with local graduate the Institute for High Energy Physics and the Forschungszentrum Jülich, where there students discussing their research. Informatization, Tbilisi State University. is an extensive physics
Recommended publications
  • Jet Quenching in Quark Gluon Plasma: flavor Tomography at RHIC and LHC by the CUJET Model
    Jet quenching in Quark Gluon Plasma: flavor tomography at RHIC and LHC by the CUJET model Alessandro Buzzatti Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences Columbia University 2013 c 2013 Alessandro Buzzatti All Rights Reserved Abstract Jet quenching in Quark Gluon Plasma: flavor tomography at RHIC and LHC by the CUJET model Alessandro Buzzatti A new jet tomographic model and numerical code, CUJET, is developed in this thesis and applied to the phenomenological study of the Quark Gluon Plasma produced in Heavy Ion Collisions. Contents List of Figures iv Acknowledgments xxvii Dedication xxviii Outline 1 1 Introduction 4 1.1 Quantum ChromoDynamics . .4 1.1.1 History . .4 1.1.2 Asymptotic freedom and confinement . .7 1.1.3 Screening mass . 10 1.1.4 Bag model . 12 1.1.5 Chiral symmetry breaking . 15 1.1.6 Lattice QCD . 19 1.1.7 Phase diagram . 28 1.2 Quark Gluon Plasma . 30 i 1.2.1 Initial conditions . 32 1.2.2 Thermalized plasma . 36 1.2.3 Finite temperature QFT . 38 1.2.4 Hydrodynamics and collective flow . 45 1.2.5 Hadronization and freeze-out . 50 1.3 Hard probes . 55 1.3.1 Nuclear effects . 57 2 Energy loss 62 2.1 Radiative energy loss models . 63 2.2 Gunion-Bertsch incoherent radiation . 67 2.3 Opacity order expansion . 69 2.3.1 Gyulassy-Wang model . 70 2.3.2 GLV . 74 2.3.3 Multiple gluon emission . 78 2.3.4 Multiple soft scattering .
    [Show full text]
  • Karsten M. Heeger
    Karsten M. Heeger Department of Physics, Wright Laboratory Office: +1-203-432-3378 Yale University Cell: +1-475-201-2702 PO Box 208120, 266 Whitney Ave [email protected] New Haven, CT 06520-8120, USA http://heegerlab.yale.edu Appointments 2013 – Present Director, Wright Laboratory, Yale University http://wlab.yale.edu 2013 – Present Professor of Physics, Yale University http://heegerlab.yale.edu 2012 – 2013 Professor of Physics, University of Wisconsin, Madison 2009 – 2012 Associate Professor of Physics (with tenure) University of Wisconsin, Madison 2006 – 2009 Assistant Professor of Physics University of Wisconsin, Madison 2002 – 2006 Chamberlain Fellow, Physicist Scientist Lawrence Berkeley National Laboratory, Physics Division 1996 – 2002 Research Assistant University of Washington, Seattle Center for Experimental Nuclear Physics and Astrophysics Affiliations Since 2016 Associate Member, TD Lee Institute (TDLI), Shanghai Since 2008 Senior Scientist, Institute for Physics and Mathematics of the Universe (IPMU), Tokyo, Japan Since 2006 Guest Scientist, Lawrence Berkeley National Laboratory (LBNL), Nuclear Science Division, Berkeley, CA, USA Professional Development 2010 Masters Certificate in Project Management (MCPM) University of Wisconsin, School of Business Education & Degrees 2002 Ph.D. in Physics “Model-Independent Measurement of the Neutral Current Interaction Rate of Solar 8B Neutrinos with Deuterium in the Sudbury Neutrino Observatory” University of Washington, Seattle, Washington, USA Thesis Advisor: Prof. R.G.H. Robertson
    [Show full text]
  • NNPSS 2018 Agenda V36.Xlsx
    NNPSS 2018 Agenda Week 1: Monday June 18 8:10-8:45 Breakfast - Benjamin Franklin College 9:00-9:30 Welcome to NNPSS - Bass 305 Helen Caines, Paul Tipton, and Karsten Heeger 9:30-10:30 Nuclear Structure Theory I - Bass 305 Mark Caprio, Univ. of Notre Dame Chair: Yoram Alhassid, Yale University 10:30-11:00 Break - Bass 405 11:00-12:00 Nuclear Structure Theory II - Bass 305 Mark Caprio, Univ. of Notre Dame Chair: Yoram Alhassid, Yale University 12:50-1:55 Lunch - Benjamin Franklin College 2:00-3:00 Heavy Ion Theory I - Bass 305 Bjoern Schenke, Brookhaven National Laboratory Chair: John Harris, Yale University 3:00-4:00 Heavy Ion Theory II - Bass 305 Bjoern Schenke, Brookhaven National Laboratory Chair: John Harris, Yale University 4:00-4:30 Break - Bass 405 4:30-5:30 Nuclear science and national security - Bass 305 Anna Hayes, Los Alamos National Laboratory Chair: Karsten Heeger, Yale University 5:30-7:00 Opening Reception - Wright Lab Atrium and WL-216 Tuesday June 19 8:10-8:45 Breakfast - Benjamin Franklin College 9:00-10:00 Nuclear Structure Theory III - Bass 305 Mark Caprio, Univ. of Notre Dame Chair: Yoram Alhassid, Yale University 10:00-11:00 Heavy Ion Theory III - Bass 305 Bjoern Schenke, Brookhaven National Lab Chair: Eliane Epple, Yale University 11:00-11:30 Break - Bass 405 11:30-12:30 Nuclear Astrophysics Experimental I - Bass 305 Chris Wrede, Michigan State University Chair: Peter Parker, Yale University 12:50-1:55 Lunch - Benjamin Franklin College 2:00-3:00 Nuclear Astrophysics Experimental II - Bass 305 Chris Wrede, Michigan State University Chair: Peter Parker, Yale University 3:00-4:30 Coffee with speakers Bjoern Schenke - WLC 245 Chris Wrede - WL-216 4:30-6:00 Tour of Wright Lab - WL 216 start Karsten Heeger, Wright Lab Director, et al.
    [Show full text]
  • The Brook Is Seeking Submissions of Books Recently Written by Alumni, Faculty, and Staff
    jjo4 .// Many Voices, Many Visions, One University by Glenn Jochum ~Ci 4 !IIIIIr by Arlen Feldwick-Jones Quarks Matter Stony Brook-Brookhaven Collaboration Goes Off With A Bang HUNDREDS OF THE WORLD'S FOREMOST PHYSICISTS CON- VERGED AT STONY BROOK UNIVERSITY TO AITEND THE QUARK MATTER 2001 CONFERENCE, CO-HOSTED BY THE UNIVERSITY AND BROOKHAVEN NATIONAL LABORATORY. In the Beginning... To understand why nearly 700 physicists from 35 countries visited Stony Brook University for a cold week in January, we have to go back to the dawn of time-to the Big Bang. There is agreement that the first moment of the Universe began with this momentous event. In the first few microseconds after the Big Bang, all matter is thought to have existed in a "soup" called the quark-gluon plasma (QGP). This soup, Technology, and Princeton University-that run federal laboratories. composed of quarks, gluons, and other particles such as electrons, Brookhaven Lab supports 700 full-time scientists and hosts more muons, and photons, was incredibly hot: more than a trillion degrees. than 4,000 visiting researchers a year. The involvement of more than As matter expanded and cooled, the quarks and gluons froze together 1,0(X) scientists from around the globe in RIIIC's four experiments is to form the protons and neutrons in the atoms of ordinary matter. reflective of the enormous international effort and support behind Electrons, muons, and photons survived the cooling expansion phase the Stony Brook-Brookhaven collaboration. President Shirley Strum and formed the atoms and molecules that comprise the universe we Kenny told the Quark Matter crowd, "By integrating education and observe today.
    [Show full text]
  • Search for Quark-Gluon Plasma from RHIC to LHC: Intro to Rel
    Search for Quark-Gluon Plasma from RHIC to LHC: Intro to Rel. Heavy Ion Physics, Bulk Dynamics at RHIC, What to “Expect” at LHC! John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 at t ~10-5 seconds: On the “First Day” T = 2 trillion K absolute Quark-hadron transition Quark Soup Rapid inflation gravity electro- magnetism forces separate There was light! at t ~ 10-43 seconds weak strong John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 Lattice QCD ε/T4 ~ # degrees of freedom νπ2 ε = T 4 30 many d.o.f.→deconfined F. Karsch, et al. Nucl. Phys. B605 (2001) 579 3 TC ~ 175 ± 8 MeV →εC ~ 0.3 - 1 GeV/fm few d.o.f.→confined John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 Modifications to αs heavy quark-antiquark coupling at finite T from lattice QCD O.Kaczmarek, hep-lat/0503017 Constituents - Hadrons, dressed quarks, quasi-hadrons, resonances? Coupling strength varies investigates (de-)confinement, hadronization, & intermediate objects. high Q2 low Q2 John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 Modifications to αs heavy quark-antiquark coupling at finite T from lattice QCD O.Kaczmarek, hep-lat/0503017 Nobel Prize 2005 D. Gross H.D. Politzer F. Wilczek Constituents - Hadrons, dressed quarks, QCD Asymptotic Freedom (1973) quasi-hadrons, resonances? Coupling strength varies investigates (de-)confinement, hadronization, “Before [QCD] we could not go back further than 200,000 years after& intermediate the Big Bang. Today…since QCD simplifies at high energy, we can extrapolateobjects. to very early times when nucleons melted…to form a quark-gluon plasma.” 2 David Gross,high Q 2Nobel Lecture (RMP 05) low Q John Harris (Yale) LNF Spring School, Frascati 12 – 16 May 2008 “In high-energy physics we have concentrated on experiments in which we distribute a higher and higher amount of energy into a region with smaller and smaller dimensions.
    [Show full text]
  • Hard Probes 2010
    HP2010 Hard Probes 2010 4th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions October 10-15, 2010 Eilat, Israel Hard Probes 2010 4th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions Program Sunday, 10 October 2010 14:00-16:00 Student Lectures - I Location: Big Blue Hall - A Chair: Elena Bratkovskaya 14:00 QCD basics Charles Gale (McGill University) 15:00 Experimental challenges in the measurement of electromagnetic probes Tom Hemmick (Stony Brook University) 16:00 Coffee break 16:30-18:30 Student Lectures - II Location: Big Blue Hall – A Chair: James Dunlop 16:30 Theoretical review of hard probes Nestor Armesto (University of Santiago de Compostela) 17:30 Experimental review of hard probes John Harris (Yale University) 19:00-21:00 Welcome Reception Location: Pool Lawn floor “L” 2 Hard Probes 2010 4th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions Monday, 11 October 2010 09:00-10:40 Plenary 1A Location: Big Blue Hall – A Chair: Dmitri Kharzeev 09:00 Welcome Itzhak Tserruya (Weizmann Institute of Science, Rehovot) 09:10 ALICE results from p+p collisions at the LHC Karel Safarik (CERN) 09:40 ATLAS results from p+p collisions at the LHC Attilio Andreazza (INFN, Milano) 10:10 CMS results from p+p collisions at the LHC Hermine K. Woehri (LIP, Lisbon) 10:40 Coffee break 11:10-12:40 Plenary 1B Location: Big Blue Hall - A Chair: Xin-Nian Wang 11:10 Jets reconstruction – theory Gregory Soyez (CEA, Saclay) 11:40
    [Show full text]
  • ALICE Collaboration
    Prospects for First Measurements with ALICE in Pb+Pb Collisions at the LHC LHC Alice Dedicated “general purpose” Heavy Ion experiment at LHC John Harris (Yale) for ALICE Collaboration INT Workshop, Seattle, Washington, May 25, 2010 Heavy Ions at the LHC • Determine Initial Conditions – What is the extent of shadowing, saturation, CGC? → sets the stage for particle production / dynamics • Expect different timescales, shorter interaction times, higher energy (T) compared to RHIC! Does system still equilibrate rapidly? Thermal model still apply? → T still ~ Tc (lattice QCD)? Does it flow? Elliptic Flow change? → v2 still saturated? More or less v2? pT dependence? Is the QGP still strongly- (or weakly-) coupled? Liquid? More like a gas? → No longer “nearly-perfect” fluid flow? viscosity? → Impact on energy loss!! • Understand parton energy loss! – What are the microscopic processes? → mass and flavor dependence? → use high pT jets & tag heavy quark jets • Understand response of the medium! Strongly interacting quarks and gluons → away-side response? → use punch-through & associated jet • Color screening of the medium! Deconfinement? (compare LQCD), initial T, other effects → J/ψ & Y states John Harris (Yale) for ALICE Collaboration INT Workshop, Seattle, Washington, May 25, 2010 ALICE Collaboration ~ 1000 Members (63% - CERN States) ~ 30 Countries ~ 100 Institutes Spain/Cuba Romania Japan Brazil South Africa Korea USA Italy China India Croatia Armenia Ukraine US ALICE – 13 Institutions Mexico 57 members (inc. 12+ grad. students) JINR Russia Cal. St. U. – San Luis Obispo, Chicago St. University, France Creighton University, University of Houston, Netherlands Lawrence Berkeley Nat. Lab, Lawrence Livermore Hungary Nat. Lab, Oak Ridge Nat. Lab, Ohio State University, UK Greece Germany Purdue University, University of Tennessee, Sweden Poland Finland University of Texas at Austin, Wayne State University, Norway CERN Slovak Rep.
    [Show full text]
  • Grad Open House Comb 2021
    Nuclear/Particle/Astrophysics Relativistic Heavy Ions Neutrinos & Synergies Fundamental Symmetries - Yale Center for Astronomy and Astrophysics (YCAA) - Yale Center for Research Computing (YCRC) - Yale Quantum Institute (YQI) Elementary Particles Astrophysics & Cosmology Quantum PhysicsFaculty, PIs & Devices 16 faculty 6 adjunct/research faculty 10 postdocs 35 graduate students Scientists, Staff, Students 11 research ~130 total personnel scientists State-of-the-Art Facilities https://wlab.yale.edu New Tools for Discovery Li scintillator detectors for reactor ν coldest cubic meter of Universe to study 0νββ zero point motion close to for dark matter search at South Pole low-background NaI detectors zero Kelectron EDM searches axion searches LAr TPC for ν . ● Most vortical liquid- spins 10 billion trillion times faster than the Relativistic Heavy-Ions at Yale most powerful tornado Caines-Harris Group ● Smallest liquid- experiments can recreate a Quark Gluon Plasma in the laboratory that is about the size of a proton Studying the Quark-Gluon Plasma - Nature’s Most Extreme Liquid Skills Learned ● High Performance Computers Collaborators on STAR - RHIC BNL - New York (Helen CoSpokesperson) How do we study the Quark Gluon Contact: Plasma? Prof.Caines and Harris [email protected] [email protected] ● Nuclear Physics Collaborators on ● Data analysis techniques ALICE - LHC ● Numerical Methods ● Hardware CERN - Geneva Interested? What makes the Quark Gluon Plasma Extreme? ● Experiments at the LHC and RHIC: smash two Nature’s first liquid -
    [Show full text]
  • Measurement of Jets and Quenching at RHIC
    ABSTRACT Measurement of Jets and Jet Quenching at RHIC1 Michael L. Miller Yale University May 2004 We provide here the ¯rst study of jets in p+p collisions at RHIC using topological jet reconstruction of charged particles. By analyzing angular correlations of large transverse momentum di-hadron pairs, we also provide the ¯rst ever direct obser- vation of jets in heavy ion collisions. Jet fragmentation to charged hadrons is then studied in Au+Au collisions as a function of impact parameter. The small-angle cor- relations observed in p+p collisions and at all centralities of Au+Au collisions are characteristic of hard-scattering processes already observed in elementary collisions. A strong back-to-back correlation exists for p+p and peripheral Au+Au collisions. In contrast, the back-to-back correlations are reduced considerably in the most central Au+Au collisions, indicating substantial interaction as the hard-scattered partons or their fragmentation products traverse the medium. These data are consistent with perturbative calculations incorporating partonic energy loss in dense QCD mat- ter. To describe the data, these calculations require an initial energy density of 20 » GeV/fm3, more than 100 times the density of cold nuclear matter. This is suggestive of the formation of a novel, decon¯ned state of quark-gluon matter. 1Relativistic Heavy Ion Collider Measurement of Jets and Jet Quenching at RHIC A Dissertation Presented to the Faculty of the Graduate School of Yale University in Candidacy for the Degree of Doctor of Philosophy By Michael L. Miller Dissertation Director: John Harris May 2004 c Copyright 2004 ° by Michael L.
    [Show full text]
  • Submitter: Jet Measurements in Pp and Pb–Pb Collisions in ALICE
    Abstract Jet measurements in pp and Pb{Pb collisions in ALICE Rongrong Ma 2014 Lattice-QCD predicts the existence of a new form of hot, dense matter called the Quark Gluon Plasma (QGP) above a critical energy density. Such matter is believed to be created in relativistic heavy-ion collisions, where sufficient energy is expected to be deposited by colliding ions in a limited volume. To study the properties of the QGP, high transverse momentum (pT) partons produced at the early stage of the collisions are used as probes. Since partons are not directly measurable, jet reconstruction, which assembles the hadron fragments of a parton into a \jet", provides an experimental tool to reconstruct the parton kinematics. When traversing the colored medium, partons lose energy via both induced gluon radiation and elastic scatterings. Consequently jet structure is modified relative to p jets generated in vacuum. The inclusive differential jet cross section in pp collisions at s = 2.76 TeV is measured, which serves as a reference for jet measurements in Pb{Pb collisions p at the same sNN. Two jet cone radii are used to reconstruct jets, and the ratio of the cross sections is formed. The good agreement between these results and perturbative QCD calculations at Next-to-Leading Order confirms the validity of the theoretical calculations in a new energy regime. Performing the same analysis in Pb{Pb collisions is challenging because of the large background. Therefore, a novel approach using the difference of the jet distributions recoiling from trigger hadrons in two disjoint pT intervals is developed to remove the contribution of background jets.
    [Show full text]
  • ABSTRACT a Measurement of Charged Particle
    ABSTRACT A Measurement of Charged Particle Ratios at High Transverse Momentum in an Ultra-Relativistic Heavy Ion Collision Matthew Allen Horsley Yale University December 2002 Ultra-relativistic heavy ion collisions taking place at RHIC are thought to create conditions favorable for the creation of a quark gluon plasma (QGP). It is the main goal of the Relativistic Heavy Ion Collider (RHIC) to create and provide a definitive characterization of the quark-gluon plasma believed to be created in high energy heavy ion collisions. A determination of the initial conditions leading to the formation of a QGP is an important part of understanding its properties. Information about the evolution of the system formed during a heavy ion collision can be obtained by investigating charged particle ratios. The charged pion and kaon particle ratios as well as the anti-proton-to-proton ratio have been measured at high transverse momentum using a RICH detector. Comparisons have been made to previous measurements made with smaller collision systems and are found to be consistent with expectations derived from these smaller systems. The transverse momentum dependence of the charged particle ratios is consistent with being constant over the range measured, 0.75 <p⊥[GeV/c] < 2.5 and can be described within a thermodynamical model of the collision and is an indication that chemical equilibrium was achieved over the course of the collision. A Measurement of Charged Particle Ratios at High Transverse Momentum in an Ultra-Relativistic Heavy Ion Collision A Dissertation Presented to the Faculty of the Graduate School of Yale University in Candidacy for the Degree of Doctor of Philosophy By Matthew Allen Horsley Dissertation Directors: John Harris, Gerd Kunde December 2002 c Copyright 2003 by Matthew Allen Horsley All Rights Reserved Acknowledgements I would like to thank my wife, Gabel, for her support and encouragement over the course of my research, for without her this work would not have been possible.
    [Show full text]
  • Claims to Fame
    Claims to Fame Discoveries Facilities Research Our commitment to both research and Stony Brook boasts modern state-of-the-art The breadth of scholarly and creative excellence has led to many ground- facilities for the campus community. activity engaged in by Stony Brook breaking discoveries. • The Charles B. Wang Center, celebrating researchers not only generates new • Identification and cataloging of Asian and American cultures, is a confer- knowledge, but also infuses our 328 distant galaxies ence and events facility, a showcase for undergraduate and graduate the arts, and a sophisticated global com- curricula and has a substantial • The link between smoking and impact on the region’s economy. emphysema munications center allowing the worldwide exchange of ideas in real time. • Stony Brook faculty members have • Development of the drug ReoPro®, rec- been responsible for more than ommended for all cardiac angioplas- • Our Kenneth P. LaValle Stadium, seat- 1,500 inventions and more than ties ing 8,300 fans, is home to Stony 450 patents. • An ultrasound method to speed up Brook’s Division I teams, including foot- healing of bone fractures ball, soccer, and lacrosse. • With 70 academic departments, Stony Brook is among the top 40 • Creation of the smallest electronic • Stony Brook Medicine is the region’s institutions funded by the National switch, using just one electron only academic medical center, providing Science Foundation. • The cause of Lyme disease advanced, specialized health care to serve the needs of Long Island residents.
    [Show full text]