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First Results from the experiment at RHIC, part 1 Achim Franz.

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1 First Results from the experiment at RHIC, part 1 Achim Franz

2 CAARI 11/02/2000Achim Franz, BNL, PHENIX2 R elativistic H eavy I on C ollider located at B rookhaven N ational L aboratory Long Island, New York Where is RHIC

3 CAARI 11/02/2000Achim Franz, BNL, PHENIX3 quark gluon plasma Search for and study of quark gluon plasma in relativistic heavy ion collisions @  s = 200 A GeV/c. spin physics Study of spin physics in polarized p - p interactions @ 50   s  500 GeV/c. Goals of the Relativistic Heavy Ion Collider

4 CAARI 11/02/2000Achim Franz, BNL, PHENIX4 The Quark Gluon Plasma, a phase transition

5 CAARI 11/02/2000Achim Franz, BNL, PHENIX5 Where is PHENIX

6 CAARI 11/02/2000Achim Franz, BNL, PHENIX6 Brazil: Sao Paolo Canada: McGill China: Academia Sinica, CIAE France: SUBATECH Germany:Münster India: BARC, Banaras Hindu University Israel: Weizmann Institute Japan: CNS, Hiroshima, KEK, Kyoto, Nagasaki, RIKEN, TITech., Tokyo, Tsukuba, Waseda Korea:Korea, Myongji, Yonsei Russia:IHEP Protvino, JINR Dubna, Kurchatov, PNPI, St. Petersburg STU Sweden: Lund U.S. National Labs: BNL, LANL, LLNL, ORNL U.S. Universities: Abilene Christian, Alabama-Huntsville, California-Riverside, Columbia, Florida State, Georgia State, Iowa State, New Mexico, New Mexico State, SUNY-Stony Book, Tennessee, Vanderbilt Collaboration

7 CAARI 11/02/2000Achim Franz, BNL, PHENIX7 Collaboration Dec. 99 me

8 CAARI 11/02/2000Achim Franz, BNL, PHENIX8 P ioneering P ioneering H igh H igh E nergy E nergy N uclear N uclear I on I on e X periment quark gluon plasma Search for and study of quark gluon plasma in relativistic heavy ion collisions @  s = 200 A GeV/c. lepton and photon signatures –Focus on lepton and photon signatures to probe early time in collision (but some hadrons signatures too) –High rate, sophisticated triggers  rare and high p T processes What is PHENIX spin physics Study of spin physics in polarized p - p interactions @ 50   s  500 GeV/c. –Spin of the proton; structure functions (e.g.,  G) –Parity violating asymmetries (e.g., in W production) as a probe of new physics

9 CAARI 11/02/2000Achim Franz, BNL, PHENIX9 What does PHENIX do MC

10 CAARI 11/02/2000Achim Franz, BNL, PHENIX10 A polarized hadron collider is uniquely suited to some spin measurements:   G (gluon fraction of proton spin) via Direct photons High p T pions J/  production  (sea-quark fraction of proton spin) via W + /W - production Polarized Drell-Yan RHIC has been equipped  To provide polarized beams of protons  To make spin measurements of same in PHENIX, STAR and specialized experiments like pp2pp. What does PHENIX do

11 CAARI 11/02/2000Achim Franz, BNL, PHENIX11 Single Snake Operation Injection with Spin Flipped : Asymmetry Flipped Adiabatically Snake on: horizontal polarization Accelerate equivalent to 180 o rotation: 180 o rotated Successful Spin commissioning

12 CAARI 11/02/2000Achim Franz, BNL, PHENIX12 3 “global” detectors 2 “forward” spectrometers 3 magnet What is PHENIX 2 “central” spectrometers

13 CAARI 11/02/2000Achim Franz, BNL, PHENIX13 BB Beam Beam Counter MVD Multiplicity Vertex Detector DC Drift Chamber PCx Pad Chambers RICH Ring Image Cherenkov counter TEC Time Expansion Chamber TOF Time Of Flight detector PbSc Lead-Scintillator Cal. PbGl Lead-Glas Calorimeter Central magnet: ~9m high, 500t ∫ B dl = 0.78Tm @ 90° Detectors installed/active this year

14 CAARI 11/02/2000Achim Franz, BNL, PHENIX14 Detectors installed this year

15 CAARI 11/02/2000Achim Franz, BNL, PHENIX15 08.08.96 History

16 CAARI 11/02/2000Achim Franz, BNL, PHENIX16 02.20.98 History

17 CAARI 11/02/2000Achim Franz, BNL, PHENIX17 01.29.99 History

18 CAARI 11/02/2000Achim Franz, BNL, PHENIX18 06.30.99 History

19 CAARI 11/02/2000Achim Franz, BNL, PHENIX19 11.30.99 History

20 CAARI 11/02/2000Achim Franz, BNL, PHENIX20 03.21.00 History

21 CAARI 11/02/2000Achim Franz, BNL, PHENIX21 09.05.00 History

22 CAARI 11/02/2000Achim Franz, BNL, PHENIX22 History 10.25.00

23 CAARI 11/02/2000Achim Franz, BNL, PHENIX23 How to Characterize a Collision

24 CAARI 11/02/2000Achim Franz, BNL, PHENIX24 IR

25 CAARI 11/02/2000Achim Franz, BNL, PHENIX25 Common to all experiments (Luminosity) measure neutral energy within a 2 mrad cone about the beam direction, centrality trigger Zero Degree Calorimeter Single neutron peak Coincidence with BBC

26 CAARI 11/02/2000Achim Franz, BNL, PHENIX26 BBC Vertex resolution  2x64 Quartz Cherenkov counter wrapped around the beam pipe  start timing (40ps), vertex location  multiplicity Beam Beam Counter

27 CAARI 11/02/2000Achim Franz, BNL, PHENIX27 Trigger Both the ZDC and BBC are used to make a decision if a collision has occurred, plus event type selection, all in a few hundred ns.

28 CAARI 11/02/2000Achim Franz, BNL, PHENIX28 DataAQuisition

29 CAARI 11/02/2000Achim Franz, BNL, PHENIX29 First Event

30 CAARI 11/02/2000Achim Franz, BNL, PHENIX30 RHIC machine studies and experiment commissioning: March thru June First collisions: June 15, 2000 at about half beam energy Initial operation (June) with 6+6 bunches yielded 500,000 PHENIX collisions. Final operation (July-September) with 55+55 bunches yielded nearly 45,000,000 PHENIX collisions! About five million events were put on tape, ~ 3TB of data ! Data

31 CAARI 11/02/2000Achim Franz, BNL, PHENIX31 PC3 (east) vs PC1 (east) nTOF vs PC1 (east) PC1 (east) vs DC Correlations

32 CAARI 11/02/2000Achim Franz, BNL, PHENIX32 Central arm, side view Detail of South-West Side PID with tracking and RICH

33 CAARI 11/02/2000Achim Franz, BNL, PHENIX33 Note: * No slewing correction * Applied track association cut :  r = 5 cm * No acceptance/efficiency/decay corrections TOF Particle Identification

34 CAARI 11/02/2000Achim Franz, BNL, PHENIX34 So far for the first part; continue with John. G. Lajoie Iowa State University

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