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CASTOR Centauro And Strange Object Research Strangelet hunt at CMS Panos Katsas University of Athens, Nuclear & Particle Physics Department for the CASTOR.

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Presentation on theme: "CASTOR Centauro And Strange Object Research Strangelet hunt at CMS Panos Katsas University of Athens, Nuclear & Particle Physics Department for the CASTOR."— Presentation transcript:

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2 CASTOR Centauro And Strange Object Research Strangelet hunt at CMS Panos Katsas University of Athens, Nuclear & Particle Physics Department for the CASTOR collaboration Adana, Athens, Krakow, Demokritos, INR, Ioannina, MSU, Northeastern COSMIC QCD II, Skopelos, 25/09-1/

3 Outline ● CASTOR detector description ● Motivation & Physics ● Experimental data & model description of strangelets ● Monte Carlo results (CNGEN, HIJING) ● Simulations results & CASTOR ● Strangelet analysis ● Summary

4 CASTOR CALORIMETER CONCEPTUAL DESIGN - Cerenkov light is generated inside the quartz plates as they are traversed by the fast charged particles in the shower (shower core detector) developing in tungsten absorber - Azimuthal and longitudinal sampling sufficient for a study of structures in longitudinal development of cascades - High depth for detection of strongly penetrating objects EM = 2RU (~ 28 X0) HAD = 16 RU (~10 Λ I ) RU ~ 7 Sampling U ~.544 Λ I ~ 14 X0 (16 azimuthal sectors)

5 Detectors near beamline: Forward Physics in p+p, p+A, A+A 140 m CASTOR Hermetic coverage up to |  | ~ 6.6 Zero degree neutral energy Physics: Centrality, Low-x, Limiting fragmentation, Strangelets, DCC

6 Option 2 (preferred) CASTOR 5.31 <  < 6.84 Inner radius ~ 38 mm Outer radius ~ 135 mm active Outer radius ~ 280 mm total T2 Tracker 5.32 <  < 6.71 CMS Very-Forward Region HF 3 <  < 5.3

7 EM - PROTOTYPE W-PLATES + Q-FIBRE / PLATES ~ 20 X o H CASTOR A L

8 CASTOR PROTO BEAM TEST 2003

9 5mm W + 2mm Q H 3mm W + 1.5mm Q EM Octant Semi-Octant CASTOR PROTO II

10 4-APDs 4(6)-APDs APDs PMT CASTOR PROTO II

11 2004 Test – Beam Results

12 CENTAURO RELATED PHENOMENA at Mt Chacaltaya (5200 m) and Pamir (4300 m) CENTAURO SPECIES: Abnormal hadron dominance (in N and E), high p T, low multiplicity ● CENTAUROS of original type (5 “classical” Chacaltaya + over a dozen others) Nh ~ 100, PT ~ 1.75 GeV/c ● MINI-CENTAUROS ● CHIRONS STRONGLY PENETRATING COMPONENT: cascades, clusters, halos, frequently accompanying hadron- rich events Review: E.G.-D. Phys. Part. Nucl34(2003)285

13 STRONGLY PENETRATING CASCADES in Pb CHAMBERS STRANGELETS? Cascades pass through the chamber practically without attenuation and revealed many-maxima character with small distances between humps First observation: Krakow group,17 th ICRC, exotic cascades in Centauro-like event Other events Arisawa et al.,Nucl. Phys. B424(1994) cm Pb~3.6 Λ in t End of usual hadronic cascade ~1.5 Λint

14 Long penetrating hadronic component in CR events (Strangelet ??) 3.6 λ I 3.2 λ I 3.6 λ I Hadron 1.5 λI Hadron

15 Estimated for LHC Centauros: Energy density ε ~ GeV/fm 3, Temperature T ~ MeV Baryon chemical potential µ b ~ GeV/fm 3 Possible STRANGELET FORMATION CNGEN Centauro generator + Strangelet formation

16 Stable strangelet interaction in CASTOR MC-algorithm Strangelet is considered with radius: Mean interaction path: Passing through the detector strangelets collide with W nuclei: Spectator part is continuing a passage; Wounded part produces particles in a standard way. Particles produced in successive interaction points initiate a development of electromagnetic-nuclear cascades. Process ends when strangelet is destroyed. E. Gładysz, Z. Włodarczyk, J. Phys. G23(1997)2057 Code implemented in CMS environment

17 MULTIPLICITY in CASTOR’s acceptance CENTAURO HIJING Low multiplicity High multiplicity mostly baryons + kaons dominated by pions Simulations with CNGEN (S.. Sadovsky et al..,Phys. Atom. Nucl. 67(2004)396 ) N = 58 N = <  < 6.8

18 Probability of CENTAURO and STRANGELET detection CASTOR  ~70 % of Centauro fireball decay products and substantial part of created strangelets are within CASTOR’s acceptance  Even very high energy strangelets (E ~ 30 TeV) are expected to be produced 5.3 <  < 6.8 T=300 MeV Ewa Gladysz

19 CASTOR Probability of CENTAURO and STRANGELET detection  ~65 % of Centauro fireball decay products and substantial part of strangelets are within CASTOR’s acceptance  Even very high energy strangelets (E ~ 20 TeV) are expected to beproduced 5.3 <  < 6.8 T=250 MeV

20 Simulation results & CASTOR

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22 HIJING Pb + Pb Event (background) E ~ 130 TeV ~ 8 TeV/sector ~ 100/sector CASTOR

23 Energy distribution in CASTOR HIJINGStrangelet in one sector Energy in sectors Energy in RU’s Energy in sectors Energy in RU’s

24 Strangelet simulations in the CMS environment (OSCAR) Geometry configuration: 1 layer: 5 mm W + 2 mm quartz plate ~2.37 X0 1 SU = 7 layers per readout unit 16 (in  x 18 (in z) readout channels Total depth: ~300 X0, 10.5 Λ int EVEN LOW ENERGY STRANGELETS (~5 TeV) ARE APPARENTLY SEEN ABOVE THE BACKGROUND ! 300 X 0

25 Results for finer sampling of the geometry 12 TeV 9 TeV

26 Strangelet identification & Analysis Strangelet signatures Azimuthal asymmetry In energy deposition Longitudinal transition curves  Event-by-event analysis  Analysis procedure in 2 steps: average distribution energy distribution per RU Large magnitude of fluctuations manifest abnormal transition curves

27 HIJING + strangelet HIJING HIJING+strangelet Transition curves & fluctuations

28 Fluctuations in energy distribution RU’s Sector containing strangelet

29 Analysis results: I Estr = 7,5 TeV Estr = 10 TeV EM-cut only H-section EM+H section sector containing strangelet

30 Two Stage Construction & Implimentation STAGE I STAGE II

31 STAGE I STAGE II

32 Reducing the number of RU’s 16x18 channels16x9 channels

33 Conclusions ● CASTOR is the experimental tool for strangelets ● Strangelet detection through measurement of: – extreme imbalance between the hadronic and electromagnetic component (multiplicity & energy) – non-uniform azimuthal energy deposition – penetrating objects beyond the range of normal hadrons, abnormal longitudinal energy deposition pattern

34 CENTAURO I Observed: Energy ~ 231 TeV 7 cascades in upper chamber 43 cascades in lower chamber Lattes,Fujimoto, Hasegawa, Phys. Rep. 65, 151 (1980) Ohsawa, Shibuya, Tamada, Phys.Rev.D70,074028(20 04)

35 Energy in CASTOR reading channels Continuous numbering schemes: 16 x 18 = 256 channels HIJINGStrangelet ID 2 ID 1 ID 2

36 Analysis results: II Strangelet in two sectors Ε 1 ~ 3.3TeV E 2 ~ 4 TeV Estr = 7,5 TeV Sectors with strangelet ~ 14% of strangelets deposit their energy in two sectors

37 A=15, E=7.5 TeV A=10, E=5 TeV60 pions, 1TeV each

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