The ATLAS detector at CERN will provide a high-resolution
longitudinally-segmented calorimeter and precision tracking for the upcoming
study of heavy ion collisions at the LHC (sqrt(s_NN)=5520 GeV). The calorimeter
covers |eta|<5 with both electromagnetic and hadronic sections, while the inner
detector spectrometer covers |eta|<2.5. ATLAS will study a full range of
observables necessary to characterize the hot and dense matter formed at the
LHC. Global measurements (particle multiplicities, collective flow) will
provide access into its thermodynamic and hydrodynamic properties. Measuring
complete jets out to 100's of GeV will allow detailed studies of energy loss
and its effect on jets. Quarkonia will provide a handle on deconfinement
mechanisms. ATLAS will also study the structure of the nucleon and nucleus
using forward physics probes and ultraperipheral collisions, both enabled by
segmented Zero Degree Calorimeters.Comment: 9 pages, 8 figures, submitted to the Proceedings of Quark Matter
  2006, Shanghai, China, November 14-20, 200

Accardi A

Adler S S

Escalier M

Huovinen P Ruuskanen P V

Iancu E Venugopalan R

Kolb P F Heinz U W

Lajoie J

P Steinberg

Pinfold J

Rosselet L

Takai H

the ATLAS Collaboration

White S N

English

arXiv

The ATLAS detector at CERN will provide a high-resolution longitudinally-segmented calorimeter and precision tracking for the upcoming study of heavy ion collisions at the LHC (sqrt{s_{NN}=5520 GeV). The calorimeter covers |eta|<5 with both electromagnetic and hadronic sections, while the inner detector spectrometer covers |eta|<2.5. ATLAS will study a full range of observables necessary to characterize the hot and dense matter formed at the LHC. Global measurements (particle multiplicities, collective flow) will provide access into its thermodynamic and hydrodynamic properties. Measuring complete jets out to 100's of GeV will allow detailed studies of energy loss and its effect on jets. Quarkonia will provide a handle on deconfinement mechanisms. ATLAS will also study the structure of the nucleon and nucleus using forward physics probes and ultraperipheral collisions, both enabled by segmented Zero Degree Calorimeters

Steinberg, P.

CERN Document Server

Heavy Ion Physics at the LHC with the ATLAS Detector

The ATLAS detector at CERN will provide a high-resolution longitudinally-segmented calorimeter and precision tracking for the upcoming study of heavy ion collisions at the LHC (sqrt{s_{NN}=5520 GeV). The calorimeter covers |eta|<5 with both electromagnetic and hadronic sections, while the inner detector spectrometer covers |eta|<2.5. ATLAS will study a full range of observables necessary to characterize the hot and dense matter formed at the LHC. Global measurements (particle multiplicities, collective flow) will provide access into its thermodynamic and hydrodynamic properties. Measuring complete jets out to 100's of GeV will allow detailed studies of energy loss and its effect on jets. Quarkonia will provide a handle on deconfinement mechanisms. ATLAS will also study the structure of the nucleon and nucleus using forward physics probes and ultraperipheral collisions, both enabled by segmented Zero Degree Calorimeters.The ATLAS detector at CERN will provide a high-resolution longitudinally-segmented calorimeter and precision tracking for the upcoming study of heavy ion collisions at the LHC (sqrt(s_NN)=5520 GeV). The calorimeter covers |eta|<5 with both electromagnetic and hadronic sections, while the inner detector spectrometer covers |eta|<2.5. ATLAS will study a full range of observables necessary to characterize the hot and dense matter formed at the LHC. Global measurements (particle multiplicities, collective flow) will provide access into its thermodynamic and hydrodynamic properties. Measuring complete jets out to 100's of GeV will allow detailed studies of energy loss and its effect on jets. Quarkonia will provide a handle on deconfinement mechanisms. ATLAS will also study the structure of the nucleon and nucleus using forward physics probes and ultraperipheral collisions, both enabled by segmented Zero Degree Calorimeters

arXiv:0705.0382v1  [nucl-ex]  2 May 2007H eavy Ion Physics at the LH C w ith the AT LA SD etectorP Steinberg,on behalfofthe AT LA S C ollaborationBrookhaven NationalLaboratory,Upton,NY 11973E-m ail:peter.steinberg@bnl.govA bstract. The ATLAS detector at CERN will provide a high-resolutionlongitudinally-segm ented calorim eterand precision tracking forthe upcom ing studyof heavy ion collisions at the LHC (psN N = 5520 G eV). The calorim eter coversjj < 5 with both electrom agnetic and hadronic sections,while the inner detectorspectrom etercoversjj< 2:5.ATLAS willstudy a fullrangeofobservablesnecessaryto characterize the hot and dense m atter form ed at the LHC.G lobalm easurem ents(particlem ultiplicities,collective ow)willprovideaccessinto itstherm odynam icandhydrodynam ic properties. M easuring com plete jets out to 100’s ofG eV willallowdetailed studiesofenergy lossand itse ecton jets. Q uarkonia willprovide a handleon decon nem ent m echanism s. ATLAS willalso study the structure ofthe nucleonand nucleususing forward physicsprobesand ultraperipheralcollisions,both enabledby segm ented Zero DegreeCalorim eters.1. Introduction: H eavy Ion Physics at the LH CHeavy ion physics at the LHC is the next natural step in the evolution of theunderstandingofQCD.Thiscan beseen m ostclearly when oneconsidersthedynam icalevolution ofaheavy ion collision.Thestudy ofparticlem ultiplicitiesand m onojetsgiveinsightintohigh density QCD and theparton structureofthenucleusvia m odelsbasedon parton saturation,such asthe colorglasscondensate[1]. Hard processesprobe thevery earliestphaseofthecollision processviatheproduction ofjets,photons,and heavyquark statesfrom parton-parton interactions [2]. Through the use ofthese calibratedprobes,onecan study theirm odi cation in nuclearcollisionsand thuslearn aboutQCDin m edium aswellasthe m edium itself[3].By the study ofparticle yieldsin , andpT,both inclusive and identi ed,one can m ake connections to hydrodynam ics (bothidealand not)and probethe equation ofstate which encodesthe relevantm icroscopicdegrees offreedom [4]. Finally,the study ofintegrated yields and the com parison ofdi erenthadron speciesand theirdecaysgivesa handle on the therm aland statisticalpropertiesofthesystem [5].The suite ofcollision system s(p+p,A+A,p+A)and detectors(ALICE,ATLAS,and CM S)attheLHC areideally suited toaddressalloftheabovetheoreticalquestionsvia precise experim entalm easurem entsusing phenom enologicaltoolsdeveloped in theHeavy Ion Physicswith ATLAS 2Figure 1. ATLAS acceptance in pseudorapidity. All detectors have com pleteazim uthalcoverage.contextofRHIC collisions[2,6].HerewediscusstheprogressoftheATLAS heavy ione ortto ready itselfforPb+Pb running in late 2008 orearly 2009. Previousprogressin preparationsforATLAS running have been reported in Refs.[7,8,9,10,11]and intheLetterofIntent[12].z2. AT LA S D etectorThe ATLAS detectorisa powerfultoolforstudying the high m ultiplicity ofparticlesthatem ergefrom thecollision ofprotonsand nuclei[13,14].A particularstrength oftheATLAS detectoristheherm etic liquid argon (LAr)electrom agnetic (EM )calorim eter,which providesexcellentenergy and position inform ation on electronsand photonsviaitslongitudinally-segm ented towers[15]. Ofcourse,there isalso a sophisticated innertracking system for reconstructing charged tracks and a large volum e m uon trackingsystem .Likem any m odern colliderdetectors,ATLAS hasherm eticazim uthalcoverageovera widerangein pseudorapidity.Theinnertracking system coversjj< 2:5 with siliconpixels,silicon strips(SCT),and a straw-tube transition-radiation tracker(TRT).Theelectrom agnetic calorim eter covers jj< 3 with angular resolution depending on thelayer (     = 0:003 0:1;0:025 0:025;0:05 0:025). The barrelhadronic tilecalorim eter covers (jj< 1:8) with towers of0:1 0:1. In the forward direction,thehadronic forward calorim eterhascellsup to 0:2 0:2,and a forward LArcalorim etercoversup to  = 5 with cellsof0:2 0:2.Additionaldetectors willextend the ATLAS acceptance farther into the forwardregion. The LUCID gasCerenkov detector[16]detectsprim ary charged particle from5:3 < jj< 6.W hileitwillbeprim arily purposed forlum inosity m onitoring,itshouldz N ote on Figures: Unless otherwise noted, the  gures shown here were based on studiesusing m odi ed versions ofATLAS production software. Thus,they should be considered \ATLASprelim inary". For com pleteness,we list the version ofAthena software used for each  gure: Figure2(left) used 12.0.31 with a new tracking algorithm while Figure 2(right) and Figure 3 used 12.0.3.Figures4-6 used 11.0.41 and specialjetalgorithm s.Figure7(right)wasproduced with an unm odi ed11.0.3.Heavy Ion Physicswith ATLAS 3ηdN/d0 1000 2000 3000Reconstructed/True00.51HIJING 5500 GeV Pb+Pb(GeV/c)Tp0 2 4 6 8 10 12Efficiency-410-310-210-1101HIJING Pb+Pb 5500 GeV, b=2.3 fmEfficiencyFakesGhostsFigure 2. (left) Reconstruction oftracklets in the ATLAS pixeldetectors. (right)Tracking reconstruction e ciency,ghostrate,and fakeratein centralHIJING events.also provideam easureofforward particleyieldswith a readoutsystem thatcan resolvem ultipleparticlespertube.M oreim portantly forheavy ion physicsistheZero DegreeCalorim eter (ZDC) being designed and built especially for ATLAS by a consortiumof US groups [17]. This detector willbe able to detect forward neutron spectatorfragm ents,which serves as both a high-purity event trigger as wellas an estim atorforthe\centrality"ofthecollision (related directly totheim pactparam eter).However,itshighly-segm ented frontEM section willalso beableto m easuretheangleofneutralclusters. Thisallowsthe reconstruction ofneutraldecayslike 0 and ,which willbediscussed below.3. G lobalD ynam icsThem ostpressing issuefortheearly daysattheLHC istoestablish theglobalfeaturesofheavy ion collisions. This involves the estim ation ofthe inclusive charged-particleyield, both integrated and as a function of pseudorapidity, to get a handle on theinitial-state entropy production which controlsthe hydrodynam ic evolution aswellasjetquenching [18]. Italso entailsstudying the elliptic  ow forinclusive particlesasafunction ofcentrality,pT and pseudorapidity [19]. One ofthe m ajorquestionsfortheLHC heavy ion program iswhetherthepresum ed \hydro lim it" hasreally been reachedin RHIC collisions,orifthem agnitudeofelliptic  ow scaled by theeccentricity (v2=)willcontinueto increasewith particleyield.Estim ating the particle density can be done in a variety ofways. Even before thetrackingsystem isfullycom m issioned,areasonably-aligned pixeldetectorcan beused tom easureparticleyieldsby the\tracklet"techniquepioneered atRHIC by thePHOBOSexperim ent[20].Thistechnique involvesm atching theanglesoftwo pixelspacepointswith the estim ated eventvertex m easured using the restofthe innerdetector. W hileitisnotasrobustasthe fulltracking procedure,ithasa lowerintrinsic pT cuto andHeavy Ion Physicswith ATLAS 4b (fm)0 2 4 6 8 10 12 14resolution00.20.40.60.81)>RPΨ-EP,NorthΨ<cos2(EMC BarrelEMC EndcapHad EndcapForward Calb (fm)0 2 4 6 8 10 12 14resolution00.20.40.60.81)>EP,SouthΨ-EP,NorthΨ<cos2(EMC BarrelEMC EndcapHad EndcapForward CalFigure 3. Twocalculationsofreaction planeresolution in ATLAS,relativetothetruereaction plane(left)and between sym m etricsubevents(right).Seetextforde nitionsofthese quantities. Results are shown for di erent calorim eter subdetectors,whichcoverdi erentpseudorapidity regions(seeFig.1).thuso ersquick accesstothefullyield.Initialstudiesoftrackletswith fullsim ulations,shown in the leftpanelofFig.2,show a good e ciency which isconstantovera widerange ofm ultiplicities em itted in jj< 1. Ofcourse the fullinner detector willbeindispensibleforestim atingparticleyieldsand spectra.Theperform anceofearlystudiesofthe fulltracking algorithm in a heavy ion environm ent is shown in the rightpanelofFig.2. Forcentral(b= 2:3 fm )HIJING events,we  nd an approxim ately constante ciency of 70% overa broad rangein pT and low fakeand ghostrates.Estim ating elliptic  ow involves the calculation ofthe Fouriercom ponentsofthem easured angular distribution relative to the \reaction plane" (the angle 	 R P seenby the neutron spectators) or \event plane" (the angle 	 E P seen by the em ittedparticles them selves) [21]. The param eter v2 is de ned via the expansion dN =d /1 + 2v2cos[2(   	 )]where 	 = 	R or 	 E , and is estim ated by calculating v2 =hcos[2(   	 )]ifrom experim entaldata.Thekey gureofm eritwhich controlsthequalityofthem easurem entisthereactionplaneresolution which isused to correcttheexperim entaldata.Thiscan beestim atedin an idealcase by the expression hcos(	 E P   	 R P )i. In a realm easurem ent, it istypically assum ed that the fullevent sees the sam e reaction plane and the form ulaqhcos[2(	 E P;N   	 E P;S)]i is used to estim ate the reaction plane resolution by them easurem entoftwosym m etricsubevents,onein theforward hem iphereand theotherinthebackward hem isphere.Fig.3showstheidealand subeventreaction planeresolutionas a function ofim pact param eter and subdetector, each ofwhich cover a di erentpseudorapidity region. The resolutions are typically near 1 for m ost ofthe inelasticcross section. Even for the m ost challenging environm ents,e.g. peripheralcollisionswith low m ultiplicity and centralcollisionswith a low v2 signal,they arealwaysabove0.3. These high resolutionsprovide a m ajoradvance overRHIC m easurem ents whichHeavy Ion Physicswith ATLAS 5Figure 4. (left)Schem aticoftheATLAS EM CAL longitudinalsegm entation.(right)Signalsin the rstEM CAL layerstrips,showingaphoton am idstuncorrelated HIJINGbackground.had reaction planeresolutionstypically below 0.5 [22,23].4. JetsThe detailed study offully-reconstructed jets willbe the m ajor contribution oftheLHC to the understanding ofthe strongly-interacting QGP thought to be form ed inheavy ion collisionsatRHIC.Both thecopiousproduction ofjetsand theexperim entalacceptance are unprecedented in the study ofrelativistic heavy ions[2]. The ratesofhard processesin p+ p and A + A collisionswillincreasedram atically relativeto RHICenergies. Ofcourse,so willthe yields ofuncorrelated soft particles,which m ay wellsu er enorm ous  uctuations ifcopious m inijet production indeed dom inates the bulkparticle production.Thus,itisessentialto have a calorim eterwith a largeacceptancein  and  with excellentenergy and position resolution,to contain fulljet,dijet,-jetand Z-jetevents.Com bining inform ation from thedi erentm easurem entswillprovidea good handle on the jetE T scale (e.g.from -jetand Z-jetevent)and fragm entationproperties.Asm entioned above,thelongitudinalsegm entation oftheATLAS electrom agnetic(EM )calorim eter,illustrated in Fig.4 isuniqueattheLHC and willbeessentialforjetphysicsattheLHC [15].Detailed sim ulationshaveshown that60% ofthetotalenergy(including both charged and hadronic energy) ranges out in the  rst EM CAL layer.M ost ofthe hadronic com ponent is charged and only leaves M IPS in the  rst layer.Thism eansthatphotons,especially thoseofseveralGeV and above,areeasily observedabovethelargecentralHIJING background in the rstlayer,asshown in Fig.4.Thiswilldram atically enhance ATLAS’s ability to m ake direct photon m easurem ents bybeing ableto rejecteven closedecay photon pairs[24].Heavy Ion Physicswith ATLAS 6 (GeV)TE0 50 100 150 200 250 300T/E T E∆σ00.10.20.30.40.5Seed Cut = 5 GeV =  35 -  70 GeVTp =  70 - 140 GeVTp = 140 - 280 GeVTp Pseudorapidity -4 -3 -2 -1 0 1 2 3 4T/E T E∆σ00.20.40.6Seed Cut = 5 GeV =  35 -  70 GeVTp =  70 - 140 GeVTp = 140 - 280 GeVTpFigure 5. Energy resolution forjetsin the ATLAS acceptance,asa function ofjetE T and .In order to study the ability of ATLAS to identify and reconstruct jets, e.g.generated by PYTHIA,they areem bedded into heavy ion events.From thesesam ples,variousreconstruction procedurescan betested and evaluated.Oneprocedureinvolvesestim ating thebackground by excluding jetcandidatesand averaging theenergy in thecalorim eterswithin a chosen towersize.Thisaverageenergy issubtracted and then thestandard ATLAS jet reconstruction algorithm s are run on the m odi ed towers. Thisallows heavy ion data analysis to take advantage ofprogress with jet reconstructionalgorithm sand calibration.Thecurrentresults,applyingthesubtraction techniqueandthestandard ATLAS jetreconstruction algorithm sdown to 50 GeV,areshown in Fig.5for jets ranging from E T = 50  300 GeV and resolutions range from  25% at thelowestenergiesconsidered to 10  12% athigherenergies. The resolution iscurrentlyindependentof,asseen in Fig.5 forjj< 2:5.Anothertechnique currently underintense developm entisone applying the \FastkT" algorithm [25]directly to heavy ion data withouta separate subtraction step. Ingeneral,kT algorithm s reconstruct jets backwards along the fragm entation chain bycom bining particles that m inim ize dij = m in(kiT;kjT)R2 (where R p 2 +  2)which essentially encodes the 1=k2T probabilities of parton splitting. W hile thesealgorithm saretypicallyO (N 3)(whereN isthenum beroftracksorcalorim eterclusters),Cacciariand Salam haveused thetechniqueofVoronoidiagram storeducetheproblemto O (N logN ). This allows the algorithm to be run quickly even in centralheavyion events. Early results are shown in Fig.6. One can set a m axim um radius forparticlesto beclustered,e.g.R m ax = 0:4 which groupsthetowersinto m any (e.g.10’s)ofjet candidates. These candidates can be characterized by various properties,e.g.m axim um towerenergy and average cellenergy,asillustrated fora single eventin theleftpanelofFig.6. The ratio ofthese quantitiesfora single event’s jetcandidatesisshown asa function ofpseudorapidity in Fig.6,whereitisobserved thatjetsareeasilydistinguished from therestofthebackground on an event-by-eventbasis,and withouta separatebackground-subtraction step.Heavy Ion Physicswith ATLAS 7 (rad)φ-3 -2 -10 12 3η-202050R=0.4, EMB/EC (GeV)TEη-4 -3 -2 -1 0 1 2 3 4> T / <ET,maxE0510R=0.4, EMB/ECFigure 6. Extraction ofjetsfrom ATLAS calorim etersusingthe\FastkT "algorithm .µ+µ−invariant mass (GeV/c2)dN/dm ΥΥ´Υ´´020040060080010009 9.2 9.4 9.6 9.8 10 10.2 10.4ΥΥ´Υ´´01000200030004000500060007000800090008.5 9 9.5 10 10.5 11 11.50 2 4 6 8 10 12 14 16 18 200123456upsilon transverse momentum, GeVupsilon pseudorapidityFigure 7. (left) Reconstruction ofupsilonswithin the ATLAS m uon spectrom eter.(right) Acceptance  e ciency for upsilons as a function ofpseudorapidity () andtransversem om entum (pT ).5. Q uarkoniaThesuppression ofJ=	 ’sproduced in heavy ion collisionshasbecom ea m ajorquestionarising from recent RHIC data. W hen cast as R A A,it is found that the suppressionslightly forward ofm id-rapidity is quite sim ilar in data from the SPS (psN N = 17:3GeV,and RHIC (psN N = 200GeV)[26].Thesetwoenergiesarean orderofm agnitudedi erent,with particledensitiesdi erentby afactoroftwo,m akingthesim ilarity in thedataquitepuzzling.TheLHC willincreasepsN N by anotherfactorof27,which shouldshed som e light on the situation regardless whether the suppression patterns rem ainenergy independentorundergo a dram aticchange.TheATLAS m uon spectrom eterisa high precision trackercovering jj< 2:5 withfullazim uth. W hile ithasunprecedented rapidity coverage in heavy ion collisions,itsdesign isoptim ized forvery high energy m uons. Thus,while itcan m easure m uonsoforder1TeV,them aterialbudgetoftheinnerdetectorand calorim etersm akeitdi cultHeavy Ion Physicswith ATLAS 8, MeVγγM0 200 400 600 800 1000 1200110210310410510 γγ→0piγγ→ηγγ→’ηFigure 8. (left) Reconstruction of0 and  particles via 2-photon decay into theATLAS ZDC.(right)Acceptance ofATLAS ZDC for0’sin pT vs.x2.toreconstructm uonsbelow pT = 3GeV/c.Thisim posesm inim um pT cutson J=	 and reconstruction sinceeach m uon needsto haveseveralGeV.The left panel of Fig. 7 shows an ATLAS reconstruction of upsilon m esonsreconstructed in a high statistics sam ple ofp + p collisions. The m ass resolution atpresentisM   120M eV=c2 forjj< 1,which isonly slightly a ected by thepresenceofan uncorrelated heavy ion background. The rightpanelofFig.7 showsthe ATLASacceptance for Upsilons as a function ofpseudorapidity and transverse m om entum .This  gure shows a broad  acceptance that goes beyond the nom inalspectrom eterresolution, stem m ing from the dim uon decay kinem atics, and out to very high pT.ATLAS willbe sensitive to quarkonia states over a wide kinem atic range, and willthusprobevariousaspectsofdecon nem entdynam ics.6. Low x PhysicsTheATLAS ZDCswillbeprim arily used forcentrality selection in A+A aswellasthestudy ofultraperipheralcollisions(which willexploresim ilarphysicsasnext-generationelectron ion colliders)[27].However,theirability toreconstructfar-forward 0’sin p+ pcollisions[17],shown in Fig.8,givesthem particularutility in addressing low x physics.Via thekinem aticrelationstypicalforCGC physics,x2  (pT=ps)e  y (wherepT and yarethetransversem om entum and rapidity ofthedetected 0),Fig.8showsthee ectiverange in x2 and pT reached for0’sreconstructed in the ZDC.By probing x2 down to10  6   10  8 atm oderate pT,even p+ p collisionswillbecom e interesting laboratoriesto study universalfeaturesofhadronicwavefunctions[1].7. C onclusionIn conclusion,ATLAS ispreparing intensely forheavy ion dataattheLHC in 2008andbeyond.Studiesshown in thisworkincludebulk observablesin p+p and A+A,inclusivejetsin p+p and A+A,quarkonia reconstruction,and early stepstowardslow-x physicsHeavy Ion Physicswith ATLAS 9and ultraperipheralcollisions.Ofcourse,im portantwork rem ainsto bedoneon m anytasks.New collaboratorsarealwayswelcom e,towork on software,analysis,physicsandtriggerissues!A cknow ledgm entsThe author would like to thank the Quark M atter 2006 organizers and ATLASm anagem entforthe invitation to speak in Shanghai. Thanks aswellto colleagues intheATLAS Heavy Ion W orkingGroup forprovidingthephysicsand detectorstudies,aswellasinvaluableadviceand com m entson thism anuscript.Thiswork wassupported inpartby theO ceofNuclearPhysicsoftheU.S.Departm entofEnergy undercontracts:DE-AC02-98CH10886.R eferences[1]Iancu E and Venugopalan R 2003 arXiv:hep-ph/0303204.[2]AccardiA etal.2003 arXiv:hep-ph/0310274.[3]AdlerS S etal.2006 arXiv:nucl-ex/0611006.[4]Huovinen P and Ruuskanen P V 2006 arXiv:nucl-th/0605008.[5]Braun-M unzingerP,Cleym ansJ,O eschlerH and Redlich K 2002 Nucl.Phys.A 697 902[6]W iedem ann U A 2006 AIP Conf.Proc.842 11[7]RosseletL 2005 Czech.J.Phys.55 B343[8]W hite S N 2005 arXiv:nucl-ex/0505020[9]TakaiH 2004 Eur.Phys.J.C 34 S307[10]TakaiH 2004 J.Phys.G 30 S1105[11]NevskiP 2004 Eur.Phys.J.C 33 S612[12]\Heavy Ion Physicswith theATLAS Detector" 2004 LetterofIntent,CERN/LHCC 2004-009.[13]\ATLAS:Detector and physics perform ance technicaldesign report.Volum e 1," 1999 CERN-LHCC-99-14[14]\ATLAS detectorand physicsperform ance.Technicaldesign report.Vol.2," 1999 CERN-LHCC-99-15[15]\ATLAS liquid argon calorim eter:Technicaldesign report," 1996 CERN-LHCC-96-41[16]Pinfold J 2005 \Plans for the very forward region ofATLAS:The lucid lum inosity m onitor,"Prepared for 9th ICATPP Conference on Astroparticle,Particle,Space Physics,Detectors andM edicalPhysics Applications,Villa Erba,Com o,Italy,17-21 Oct2005[17]\Zero DegreeCalorim etersforATLAS" 2007 CERN-LHCC-2007-001[18]BaierR,DokshitzerY L,M uellerA H,PeigneS and Schi D 1997 Nucl.Phys.B 484 265[19]K olb P F and Heinz U W 2003 arXiv:nucl-th/0305084.[20]Back B B etal.2000 Phys.Rev.Lett.85 3100[21]Ackerm ann K H etal.2001 Phys.Rev.Lett.86 402[22]C.Adleretal.2002 Phys.Rev.C 66 034904[23]Back B B etal.2002 Phys.Rev.Lett.89 222301[24]EscalierM etal.2005 ATL-PHYS-PUB-2005-018[25]CacciariM and Salam G P 2006 Phys.Lett.B 641 57[26]LajoieJ 2006 these Proceedings.[27]Strikm an M ,VogtR and W hite S 2006 Phys.Rev.Lett.96 082001

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Heavy ion physics at the LHC with the ATLAS detector

Heavy Ion Physics at the LHC with the ATLAS Detector

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