LHC ALICE (QGP) QGP QGP QGP QGP ω ϕ J/ψ ALICE s = ev + J/ψ
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- しげじろう うえや
- 8 years ago
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1 8 + J/ψ ALICE B597 : : : 9
2 LHC ALICE (QGP) QGP QGP QGP QGP ω ϕ J/ψ ALICE s = ev + J/ψ
3 (QGP) LHC ALICE V IS AliRoot Dimuon (Event mixing technique) (Like-sign method) acceptance efficiency (trigger efficiency)
4 acceptance efficiency Raw yield
5 [ LHC [ LHC ( )[ ALICE [ [ V IS [ J/ψ J/ψ J/ψ 4 < y <.5 J/ψ J/ψ J/ψ J/ψ acceptance efficiency J/ψ J/ψ p ( ) p ( ) PHENIX + GeV [ pol() pol(4) pol(5) pol(6) J/ψ J/ψ raw yield event mixing acceptance efficiency J/ψ like-sign method acceptance efficiency J/ψ ALICE LHCb J/ψ [ [9 / event mixing acceptance efficiency J/ψ like-sign method acceptance efficiency J/ψ
6 . 4 W Z (Quantum Chromo Dynamics, QCD) 4 ( ) c c J/ψ u d :. (QGP) (QGP) QGP. u d MeV/c u d 6
7 GeV/c QGP : [.4 u d QCD u d.5 ρ ϕ ω QGP QGP 7
8 QGP.6 QGP RHIC LHC.7 (rapidity, y) y = lne + p z = ln E + p z E p z m + p = tanh ( p z E ) () z p p = p x + p y y y p z /E z β z = v z /c z y = tanh (β) y y y z (pseudorapidity, η) η = tanh ( p z p ) = tanh (cosθ) () θ z θ m p E p.8 + J/ψ J/ψ 8
9 . LHC LHC (Large Hadron Collider) LHC (CERN) LHC ALICE CMS ALAS LHCb LHCf OEM 6 : LHC [ 4: LHC ( )[ 9
10 . ALICE ALICE (A Large Ion Collider Experiment) LHC QGP () (.9 < η <.9) () ( 4 < η <.5) () 5: ALICE [4. ALICE 4 < η < m 4 GeV/c
11 .. 5 µm m..5 ns 6: [5.4 V V z = 88cm VC.7 < η <.7 z = 9cm VA.8 < η < 5.
12 .5 z = 7cm C. < η <. z = 7cm A 4.6 < η < IS IS (Inner racking System) SPD(Silicon Pixel Detector) SDD(Silicon Drift Detector) SSD(Silicon Strip Detector) 6 7: V IS [6
13 . AliRoot AliRoot Root ALICE AliRoot AliGenBox ALICE AliRoot. ALICE 5 s = ev + J/ψ.. J/ψ 8: J/ψ 9: J/ψ... + VC VA
14 .. Dimuon + ϕ ω J/ψ J/ψ J/ψ GeV/c.4 J/ψ J/ψ M J/ψ E J/ψ p J/ψ M µ E µ p µ E J/ψ = M J/ψ + p J/ψ () (4) (5) () E J/ψ = E µ + + E µ (4) p J/ψ = p µ + + p µ (5) MJ/ψ = E µ + E µ + E + µ E µ + ( p µ + p µ + + p µ p µ +) (6) J/ψ M J/ψ = Eµ + E µ + E + µ E µ + ( p µ + p µ + + p µ p µ +) (7) ( 4 < η <.5) Dimuon.5 J/ψ J/ψ 4
15 .5. (Event mixing technique) (mixed event) N same + = N same + S N mixed + (8) (same event) (unlike-sign) N mixed + mixed event unlike-sign S N same LS dm S = N mixed + dm (9) N same LS same event like-sign mixed event unlike-sign.5. (Like-sign method) (like-sign) J/ψ R = N+ same R N++ same N same () N++ same same N like-sign N++ same N same (++) ( ) R R = N mixed + N++ mixed N mixed () R µ + µ N + mixed mixed N mixed event unlike-sign like-sign N mixed ++ mixed event like-sign unlike-sign same event like-sign 5
16 .6 exp( (x x) σ ) ( x x f(x; α, n, x, σ, N) = N σ > α) ( n α )n exp( α ) ( n α α x x σ ) n ( x x σ α) () J/ψ ( 5σ +σ) J/ψ J/ψ σ 5σ.7 acceptance efficiency acceptance efficiency J/ψ acceptance ( 4 < y <.5) J/ψ efficiency J/ψ acceptance efficiency J/ψ acceptance efficiency = J/ψ 4 < y <.5 J/ψ ().8 (trigger efficiency) acceptance efficiency J/ψ ϵ J/ψ J/ψ trigger = J/ψ (4) (5) ϵ µ trigger = p > GeV/c (6) (7) 6
17 .9 d σ dp dy = σ MB p+p N event Rf R B d N dp dy (8) σ σ MB p+p + N event R B (5.9.6)% [ N (Raw yield) Rf Rejection factor + Dimuon Dimuon Rejection factor Dimuon + σ MB = (57.8.) mb [ N event 999 [9 Dimuon N event =. 7 L int = 46.7nb σ MB σ MB = Rf N event L int (9) Rf Rf = E d σ dp = σp+p MB d N πp N event Rf R B dp dy () 7
18 ( ) ( ) J/ψ J/ψ [(4MeV/c ).6.4. distribution ( < p < GeV/c) χ / ndf.8 / 5 Mean.5. σ.67.8 N [(4MeV/c ).5.5 distribution ( < p < GeV/c) χ / ndf. / 5 Mean.. σ N M [GeV/c M [GeV/c [(4MeV/c ).5 distribution ( < p < GeV/c) 6.66 / 5 Mean.. σ.647. N 8.6 [(4MeV/c ).5 distribution ( < p < 4 GeV/c) 4.74 / 5 Mean.. σ N M [GeV/c M [GeV/c [(4MeV/c ) distribution (4 < p < 5 GeV/c) 9.48 / 5 Mean.. σ N [(5MeV/c )..8 distribution (5 < p < 6 GeV/c) 4.4 / Mean.4.4 σ N M [GeV/c M [GeV/c 8
19 ) [(5MeV/c distribution (6 < p < 7 GeV/c).8 / Mean.99.4 σ N ) [(5MeV/c distribution (7 < p < 8 GeV/c) 7.7 / Mean..5 σ N M [GeV/c M [GeV/c ) [(5MeV/c 5 distribution (8 < p < 9 GeV/c).84 / Mean.95.5 σ N 4.. ) [(5MeV/c 4 distribution (9 < p < GeV/c) 7.4 / Mean.9.7 σ N M [GeV/c M [GeV/c : ) [(4MeV/c.6.4. distribution ( < p < GeV/c) χ / ndf.66 / 5 Mean.5. σ.67.7 N ) [(4MeV/c.5 distribution ( < p < GeV/c) 4.8 / 5 Mean.4. σ N M [GeV/c M [GeV/c ) [(4MeV/c distribution ( < p < GeV/c) 9.8 / 5 Mean.. σ N 4. ) [(4MeV/c.5 distribution ( < p < 4 GeV/c) 9.5 / 5 Mean.4. σ.664. N M [GeV/c M [GeV/c 9
20 [(4MeV/c ) distribution (4 < p < 5 GeV/c) / 5 Mean.97. σ.66.5 N [(5MeV/c )..8 distribution (5 < p < 6 GeV/c).48 / Mean.7.5 σ N M [GeV/c M [GeV/c [(5MeV/c ) distribution (6 < p < 7 GeV/c) / Mean.96.5 σ N [(5MeV/c ) distribution (7 < p < 8 GeV/c).75 / Mean.9.6 σ.55.6 N M [GeV/c M [GeV/c [(5MeV/c ) 5 5 distribution (8 < p < 9 GeV/c).4 / Mean.9.5 σ N 9..5 [(5MeV/c ) distribution (9 < p < GeV/c) 4.84 / Mean.9.8 σ N M [GeV/c M [GeV/c : 4.. acceptance efficiency J/ψ ( 4 < y <.5) J/ψ J/ψ J/ψ J/ψ
21 [(GeV/c) dn/dp 5 Number of J/ψ (simulation) [(GeV/c) 4 Number of detected J/ψ aaa Entries Mean.9 RMS.96 dn/dp p [GeV/c p [GeV/c : J/ψ : J/ψ 4 < y <.5 J/ψ J/ψ J/ψ acceptance efficiency acceptance x Efficiency acceptance x efficiency e_ls Entries Mean 6.49 RMS p [GeV/c 4: J/ψ acceptance efficiency 4.. J/ψ
22 trigger efficiency of J/ψ rigger efficiency of J/ψ tels Entries Mean 5.48 RMS J/ψ p [GeV/c 5: J/ψ 4 5 acceptance efficiency J/ψ p GeV/c p < GeV/c J/ψ GeV/c 7 GeV/c J/ψ p GeV/c θ 6 J/ψ p GeV/c [GeV/c muon p dimuon p vs single muon p hist Entries 6 Mean x.94 Mean y.8 RMS x.88 RMS y [GeV/c dimuon p 6: J/ψ p ( ) p ( ) J/ψ p GeV/c
23 p GeV/c rigger efficiency of single muon trigger efficiency of single muon µ p [GeV 7:
24 distribution < p < [GeV/c ) distribution < p < [GeV/c +background ) +background [(5MeV/c Event mixing technique [(5MeV/c Event mixing technique M [GeV/c M [GeV/c distribution < p < [GeV/c ) +background ) [(5MeV/c Event mixing technique distribution < p < 4 [GeV/c +background [(5MeV/c Event mixing technique M [GeV/c M [GeV/c distribution 4 < p < 5 [GeV/c distribution 5 < p < 6 [GeV/c ) +background ) +background [(5MeV/c Event mixing technique [(5MeV/c Event mixing technique M [GeV/c M [GeV/c 4
25 ) [(5MeV/c distribution 6 < p < 7 [GeV/c +background Event mixing technique ) [(5MeV/c +background distribution 7 < p < 8 [GeV/c Event mixing technique M [GeV/c M [GeV/c ) distribution 8 < p < 9 [GeV/c +background ) distribution 9 < p < [GeV/c +background [(5MeV/c Event mixing technique [(5MeV/c Event mixing technique ) M [GeV/c M [GeV/c 8: [(5MeV/c distribution < p < [GeV/c +background Like-sign method ) [(5MeV/c distribution < p < [GeV/c +background Like-sign method ) M [GeV/c M [GeV/c [(5MeV/c distribution < p < [GeV/c +background Like-sign method ) [(5MeV/c distribution < p < 4 [GeV/c +background Like-sign method M [GeV/c M [GeV/c 5
26 ) distribution 4 < p < 5 [GeV/c +background ) distribution 5 < p < 6 [GeV/c +background [(5MeV/c Like-sign method [(5MeV/c Like-sign method M [GeV/c M [GeV/c ) [(5MeV/c distribution 6 < p < 7 [GeV/c +background Like-sign method ) [(5MeV/c +background distribution 7 < p < 8 [GeV/c Like-sign method M [GeV/c M [GeV/c distribution 8 < p < 9 [GeV/c ) +background ) [(5MeV/c Like-sign method distribution 9 < p < [GeV/c +background [(5MeV/c Like-sign method M [GeV/c M [GeV/c 9: cc bb cc bb D B B D D + = cd, D = cd, D = cu, D = cu D (9..7)%[ K - 6
27 : PHENIX + GeV [4 7
28 J/ψ 4 J/ψ 4 f n (x) = Crystalball function + pol(n) (n =, 4, 5, 6) () n (pol(n) = p i x i ) () 4 pol(n) J/ψ i= ) [(5MeV/c 5 4 distribution < p < [GeV/c χ / ndf. /. Mean..75 σ.6 N ) [(5MeV/c / 7 Mean.. σ N distribution < p < [GeV/c M µ [GeV/c + µ M µ [GeV/c + µ - ) [(5MeV/c distribution < p < [GeV/c 87.5 /.4 Mean σ.44 N ) [(5MeV/c distribution < p <4 [GeV/c 7.4 /. Mean..75 σ.58 N M µ [GeV/c + µ M µ [GeV/c + µ - ) [(5MeV/c 5 4 distribution 4 < p <5 [GeV/c 89.5 / Mean.. σ N ) [(5MeV/c distribution 5 < p <6 [GeV/c 6.5 / Mean.. σ N M µ [GeV/c + µ [GeV/c ) [(5MeV/c 5 distribution 6 < p <7 [GeV/c. / Mean.. σ N ) [(5MeV/c 4 8 distribution 7 < p <8 [GeV/c 75.7 / Mean.. σ.688. N M + [GeV/c [GeV/c ) [(5MeV/c distribution 8 < p <9 [GeV/c / ndf χ 4.6 /.4 Mean..648 σ.5 N ) [(5MeV/c distribution 9 < p < [GeV/c 48.8 / Mean.. σ.7.6 N [GeV/c [GeV/c : pol() 8
29 ) [(5MeV/c 5 4 distribution < p < [GeV/c 9.8 / Mean.8. σ.64.5 N ) [(5MeV/c distribution < p < [GeV/c / Mean.5. σ.6.8 N µ + µ M [GeV/c µ + µ M [GeV/c ) [(5MeV/c 87.4 / 7 Mean.4. 6 σ N distribution < p < [GeV/c ) [(5MeV/c distribution < p <4 [GeV/c 75.9 / Mean.. σ N µ + µ M [GeV/c µ + µ M [GeV/c ) [(5MeV/c 5 4 distribution 4 < p <5 [GeV/c 54.8 / Mean.. σ N ) [(5MeV/c 5 5 distribution 5 < p <6 [GeV/c 8.7 / Mean.. σ N µ + µ M [GeV/c µ + µ M [GeV/c ) [(5MeV/c 5 distribution 6 < p <7 [GeV/c 87. / Mean.5. σ N ) [(5MeV/c distribution 7 < p <8 [GeV/c 77.7 / Mean.. σ N M µ [GeV/c + µ M [GeV/c ) [(5MeV/c distribution 8 < p <9 [GeV/c 64. / Mean.. σ.54.9 N ) [(5MeV/c distribution 9 < p < [GeV/c 5. / Mean.. σ N M [GeV/c M [GeV/c : pol(4) 9
30 ) [(5MeV/c 5 4 distribution < p < [GeV/c 488. / Mean.8. σ.67.5 N ) [(5MeV/c 8 / ndf χ 6.6 /.6 Mean. 7 σ.69.4 N distribution < p < [GeV/c M µ + µ [GeV/c M µ + µ [GeV/c ) [(5MeV/c 7 / ndf χ 85.8 / Mean.. σ N distribution < p < [GeV/c ) [(5MeV/c distribution < p <4 [GeV/c 79.4 / Mean.. σ N M µ + µ [GeV/c M µ + µ [GeV/c ) [(5MeV/c 5 4 distribution 4 < p <5 [GeV/c 66. / Mean.. σ N ) [(5MeV/c 5 5 distribution 5 < p <6 [GeV/c 58.5 / Mean.99. σ N M µ + µ [GeV/c [GeV/c ) [(5MeV/c 5 5 distribution 6 < p <7 [GeV/c 99. / Mean.5. σ N ) [(5MeV/c 4 / ndf χ 48.9 /. Mean. σ.75.4 N distribution 7 < p <8 [GeV/c M µ + µ [GeV/c [GeV/c ) [(5MeV/c distribution 8 < p <9 [GeV/c 69.4 / Mean.. σ.59. N ) [(5MeV/c distribution 9 < p < [GeV/c 54.4 / Mean.. σ N [GeV/c [GeV/c : pol(5)
31 ) [(5MeV/c 5 4 distribution < p < [GeV/c 4.4 / Mean.8. σ.66.5 N ) [(5MeV/c distribution < p < [GeV/c 88 / Mean.5. σ N M µ + µ - [GeV/c M µ + µ - [GeV/c ) [(5MeV/c distribution < p < [GeV/c 8.8 / Mean.. σ N ) [(5MeV/c distribution < p <4 [GeV/c 84.4 / Mean.. σ N M µ + µ - [GeV/c M µ + µ - [GeV/c ) [(5MeV/c 5 4 distribution 4 < p <5 [GeV/c 5.4 / Mean.. σ N ) [(5MeV/c 5 5 distribution 5 < p <6 [GeV/c / Mean.99. σ N M µ + µ - [GeV/c M µ + µ - [GeV/c ) [(5MeV/c 5 5 distribution 6 < p <7 [GeV/c 4.9 / Mean.. σ N ) [(5MeV/c distribution 7 < p <8 [GeV/c 54.4 / Mean.. σ.695. N M µ + µ - [GeV/c M µ + µ - [GeV/c ) [(5MeV/c distribution 8 < p <9 [GeV/c 76.7 / Mean.. σ N ) [(5MeV/c distribution 9 < p < [GeV/c 58.4 / Mean.98. σ N M µ + µ - [GeV/c M µ + µ - [GeV/c 4: pol(6)
32 9 J/ψ 46 counts [a.u. 44 < p < [GeV/c num Entries 4 Mean.97 RMS.5 counts [a.u. 6 4 < p < [GeV/c num Entries 4 Mean.994 RMS f (x) f 4(x) f 5(x) (x) f 6 6 f (x) f 4(x) f 5(x) (x) f 6 counts [a.u. 8 < p < [GeV/c num Entries 4 Mean. RMS.8 counts [a.u < p < 4 [GeV/c num Entries 4 Mean.995 RMS f (x) f 4(x) f 5(x) (x) f 6 f (x) f 4(x) f 5(x) (x) f 6 counts [a.u < p < 5 [GeV/c num Entries 4 Mean.5 RMS.9 counts [a.u. 7 5 < p < 6 [GeV/c num Entries 4 Mean RMS f (x) f 4(x) f 5(x) (x) f 6 f (x) f 4(x) f 5(x) (x) f 6
33 counts [a.u < p < 7 [GeV/c num Entries 4 Mean.998 RMS. counts [a.u. 4 7 < p < 8 [GeV/c num Entries 4 Mean. RMS f (x) f 4(x) f 5(x) (x) f 6 f (x) f 4(x) f 5(x) (x) f 6 counts [a.u < p < 9 [GeV/c num Entries 4 Mean.99 RMS. counts [a.u. 9 < p < [GeV/c num Entries 4 Mean. RMS f (x) f 4(x) f 5(x) (x) f 6 f (x) f 4(x) f 5(x) (x) f 6 5: J/ψ J/ψ pol() ( 5 ) J/ψ pol() (mean) RMS( 5 )/mean J/ψ Raw yield Raw yield
34 [(GeV/c) Raw yield of J/ψ stdsys Entries Mean.6 RMS.5 dn/dp p [GeV/c 6: J/ψ raw yield 4.. J/ψ 7 acceptance efficiency 8 dy) [µb/(gev/c) production cross section cross_section Entries Mean.67 RMS.8 σ/(dp d p [GeV/c 7: event mixing acceptance efficiency J/ψ 4
35 dy) [µb/(gev/c) production cross section cross_section Entries Mean.665 RMS.79 σ/(dp d p [GeV/c 8: like-sign method acceptance efficiency J/ψ 9: ALICE LHCb J/ψ [9 ( 9[9) 7,8 5
36 ratio.4. ratio p [GeV/c : [9 / [9 % [ c [µb GeV Invariant production cross section cross_section Entries Mean.79 RMS.4 E d σ dp dy p [GeV/c : event mixing acceptance efficiency J/ψ 6
37 - [µb GeV c c Invariant production cross section cross_section Entries Mean.784 RMS.49 E d^σ dp dy p [GeV/c : like-sign method acceptance efficiency J/ψ 7
38 5 ALICE s = ev + acceptance efficiency s = ev + J/ψ ( < p < (GeV/c)) ( 4 < y <.5) 4 8
39 6 4 9
40 [,4 [ LHC ALICE -ALICE JAPAN- [ (4),, [4 he ALICE Collaboration ChapExperiment-en.html [5 he ALICE Collaboration, (), Addendum of the Letter Of Intent for the Upgrade of the ALICE Experiment : he Muon Forward racker [6 ALICE MAERS, (), he present Inner racking System - Steps forward!, [7 he ALICE Collaboration, (4), Performance of the ALICE Experiment at the CERN LHC [8 he ALICE Collaboration, (4), ALICE technical Design Report on Forward Detectors: FMD, and V [9 he ALICE Collaboration, (7), Energy dependence of forward-rapidity J/ψ and ψ(s) production in pp collisions at the LHC [ Particle Data Group, (5), Review of Particle Physics CHARMED MESONS [ Particle Data Group, (5), Review of Particle Physics BOOM MESONS http: //pdg.lbl.gov/5/tables/rpp5-tab-mesons-bottom.pdf [ he LHCb Collaboration, (5), Measurement of forward J/ψ production crosssection in pp collisions at s = ev [ he ALICE Collaboration, (6), ALICE luminosity determination for pp collisions at sqrts =ev [4 he PHENIX Collaboration, Yue Hang Leung, (7), Studying heavy flavor production via unlike-sign and like-sign dimuon spectra in p+p collisions at GeV in the PHENIX Experiment, 445/contributions/588/attachments/4884/56/yuehang_ qmposterdraft_v.pdf 4
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