Searching for Strange Quark Matter with the CMS/CASTOR Detector at the LHC

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Searching for Strange Quark Matter with the CMS/CASTOR Detector at the LHC Apostolos D. Panagiotou, University of Athens for the CMS/CASTOR Group http://cmsdoc.cern.ch/castor /. - PowerPoint PPT Presentation

Text of Searching for Strange Quark Matter with the CMS/CASTOR Detector at the LHC

  • V International Conference on PERSPECTIVES IN HADRONIC PHYSICS Particle-Nucleus and Nucleus-Nucleus Scattering at Relativistic Energies ICTP 22-26 May, 2006Searching for Strange Quark Matterwith the CMS/CASTOR Detector at the LHC

    Apostolos D. Panagiotou, University of Athensfor the CMS/CASTOR Grouphttp://cmsdoc.cern.ch/castor/

    ICTP/ Apostolos D. Panagiotou

  • CASTOR Calorimeter at CMSExotic Events in Cosmic Rays Phenomenological Models & MC SimulationsStrangelet Identification AnalysisCASTOR Prototypes - Beam test ResultsSummaryOutline

    ICTP/ Apostolos D. Panagiotou

  • CASTOR Calorimeter at CMS

    ICTP/ Apostolos D. Panagiotou

  • CASTOR5.2 < < 6.6CMS Forward Detectors

    ICTP/ Apostolos D. Panagiotou

  • TOTEM T2

    IP

    TOTEM T1

    HF

  • CASTOR CalorimeterStage IStage IISegmentation: 16(azimuth) x 14( in depth) = 224 channels

    ICTP/ Apostolos D. Panagiotou

  • CASTOR Calorimeter16x10 = 160 ChannelsStage IStage II16x4 = 64 ChannelsPMTAir-core Light Guide subtending 5 W/Q platesW/Q platesEM section 20 XoH section 10.3

    ICTP/ Apostolos D. Panagiotou

  • Exotic Events in Cosmic Rays

    ICTP/ Apostolos D. Panagiotou

  • Typical Emulsion / Lead Chambers61 mm Pb

    ICTP/ Apostolos D. Panagiotou

  • CENTAURO SPECIESAbnormal hadron dominance (in N and E), high pT, low multiplicityCENTAURO of original type (5 classical Chacaltaya + over a dozen others) Nh ~ 100, pT ~ 1.75 GeV/cMINI-CENTAUROSCHIRONSSTRONGLY PENETRATING COMPONENTcascades, clusters, halos,frequently accompanying CRhadron-rich events.

    ADP, Zeits. Phys. A- Atomic Nuclei 333(1989)355 E.G.-D. Phys. Part. Nucl34(2003)285 Exotic Cosmic Ray Events

    ICTP/ Apostolos D. Panagiotou

  • Homogeneous thick lead chamberCentauroHadron Rich CR EventsNormal

    ICTP/ Apostolos D. Panagiotou

  • Measurement settings:100 m shower core diameter threshold ~ 3 TeV(Strangelet ?)3.6 I3.2 I3.6 I1.5 I Hadron limitHadron limit

    ICTP/ Apostolos D. Panagiotou

  • Phenomenological Models MC Simulations

    ICTP/ Apostolos D. Panagiotou

  • Phys. Rev. D45(1992)3134 Astroparticle Phys. 2(1994)167 Astroparticle Phys. 13(2000)173 Phys. Atom. Nucl. 67(2004)396 anti-

    ICTP/ Apostolos D. Panagiotou

  • CENTAURO FIREBALL EVOLUTION

    56A

    +

    14N

    u, d g s s

    QUARK MATTER FIREBALL in the baryon-rich fragmentation region High mq suppresses production of (u u) , (d d), favoring g s s

    K+, K0 carry out: strangeness, positive charge, entropy

    CENTRAL COLLISIONat the top of the atmosphere Ep ~ 1740 TeV

    u, d, s

    K+

    K 0

    (u s)

    (d s)

    usd

    (pre-equilibrium) KAON EMISSION

    SQM FIREBALL

    EXPLOSION

    Strangelet

    HG

    L,X, S,...

    HG

    B < 190 MeV

    B > 190 MeV

    Stabilizing effects of s quarks long lived state

    ~75 non strange baryons + strangelet (A ~ 10 -15)

    Strangeness distillation mechanism C. Greiner et al., Phys. Rev. D38 (1988)2797

  • Pqg = (8/45)24 +q22 + q4/22 = (2.034q/4)(1/R4) = BPressure of (u,d) quark-gluon plasmaConditions for DQM-bag Stability Pqg = BMinimization of Bag energy (dE/dR = 0) in spherical DQM distribution with radius R and Nq massless quarks.For CR Centauro (q~ 600 MeV, T ~ 130 MeV, Nq ~ 225) R = roNb1/3 ~ 1.43 fm ro = 0.34 fm (~ ro collapsed nucleus)Astroparticle Phys.13(2000)173

    ICTP/ Apostolos D. Panagiotou

  • SQM: Strangelet Neutron StarQCD true Ground State

    ICTP/ Apostolos D. Panagiotou

  • Strangelet is considered with radius:

    Mean interaction path:

    Strangelets passing through the detector collide with W nuclei: Spectator part is continuing its passage. Wounded part produces particles in a standard way.

    Particles produced in successive interactions initiate electromagnetic-nuclear cascades. Process ends when strangelet is destroyed.

    E. Farhi, R. Jaffe, Phys.Rev.D30(1984)2379; M. Berger, R. Jaffe, Phys.Rev.C 35(1987)213, G.Wilky, Z.Wlodarczyk, J.Phys.G22(1996)L105; E. Gadysz, Z. Wodarczyk, J.Phys.G23(1997)2057

    The rescaled r0 is determined by the number density of the strange matter: n = A/V = (1/3)(nu+nd+ns)where ni=- i/i; (mi,i,s), taking into account the QCD O(s) corrections to the properties of SQM.

    sss

    ICTP/ Apostolos D. Panagiotou

  • MC - Stable Strangelet in CASTORP. KatsasHIJINGHIJINGDepth

    ICTP/ Apostolos D. Panagiotou

  • Strangelet Identification AnalysisP. Katsas

    ICTP/ Apostolos D. Panagiotou

  • CASTOR CalorimeterSegmentation16 Sectors (azimuthal)14 Sections/Sector (longitudinal)

    ICTP/ Apostolos D. Panagiotou

  • HIJING Pb+Pb Event at s = 5.5 TeVEtot ~ 130 TeV ~ 8 TeV/sector N < 100/sectorGeVGeV

    ICTP/ Apostolos D. Panagiotou

  • Total Energy Distribution in Sectors - HIJING Calorimeter Depth (RUs)Energy

    ICTP/ Apostolos D. Panagiotou

  • Energy distributions in CASTOR(Depth)(Depth)A = 15 E = 7.5 TeVAverage of 16 SectorsEnergyRURUSectorSector

    ICTP/ Apostolos D. Panagiotou

  • Event-by-event analysis Analysis procedure in 2 steps: Strangelet identification & Analysis(i = 1 16 sectors) = mean energy in sectors

    ICTP/ Apostolos D. Panagiotou

  • Analysis Results w/t backgroundEstr = 7.5 TeVEstr = 10 TeVEM-cutonly H-sectionEM+H sectionsector containingStrangelet + HIJINGsectors containingHIJING Pb+PbEfluctuations3

    ICTP/ Apostolos D. Panagiotou

  • Prototypes - Beam test ResultsL. GouskosCMS Reports NIM publications

    ICTP/ Apostolos D. Panagiotou

  • CASTOR Proto I Beam Test

    ICTP/ Apostolos D. Panagiotou

  • 4-APDs4-APDs4-APDs4-APDs4(6)-APDsAPDs PMTCASTOR Proto II Beam Test

    ICTP/ Apostolos D. Panagiotou

  • Energy Resolution - Electrons

    ICTP/ Apostolos D. Panagiotou

  • Energy Resolution - Hadrons

    ICTP/ Apostolos D. Panagiotou

  • Ee = 200 GeVSEMI-OCTANT GEOMETRY PROJECTION

    ICTP/ Apostolos D. Panagiotou

  • Spatial X-scan Electrons Width of Shower = 1.9 mm

    ICTP/ Apostolos D. Panagiotou

  • H = 5.3 mmSpatial X-scan Pions Width of Shower

    ICTP/ Apostolos D. Panagiotou

  • CASTOR is the experimental tool for Centauro and Strangelet search in the forward rapidity at CMS Identification through measurements of:Extreme imbalance between hadronic and electromagnetic energy.Non-uniform azimuthal energy deposition.Penetrating objects beyond the range of normal hadrons abnormal longitudinal energy deposition pattern.SummaryObservation of Centauro and (meta) stable SQM will have significant implications for QM-Physics and Astrophysics.

    ICTP/ Apostolos D. Panagiotou