Документ взят из кэша поисковой машины. Адрес оригинального документа : http://lav01.sinp.msu.ru/~vlk/LECT_2015_new/lect_12_2015_quarkinia_Y1_Y2_Y3.pdf Дата изменения: Wed Apr 22 09:45:03 2015 Дата индексирования: Sat Apr 9 23:30:58 2016 Кодировка:

| b b -
12 ..

2015 .



J / | c c , | b b
state J/
mass [GeV]
E [GeV] radius [fm]

c
3.53
0.20 0.36


3.68
0.05 0.45


9.46
1.10 0.14

b
9.99
0.67 0.22


10.02
0.54 0.28

b
10.26
0.31 0.34


10.36
0.20 0.39

3.10
0.64 0.25

. . .

· heavy: mc 1.2 - 1.4 GeV, mb 4.6 - 4.9 GeV · stable: MJ/(cc) 2MD and M (bb) 2MB D | c d , B | u b ( , M - 2M 0, M - 2M 0 )





bb

J/ , , , . (~10 ), . - . , , , .. .

P. Steiberg, T. Ullrich et al. hep-exp/0503002


LHC


pp PbPb LHC


(nS) in pp at s = 2.76 TeV
· · ·
Signal shape: sum of three Crystal Ball functions Background: 2nd order polynomial Free parameters:
(1S) mass (1S) yield (2S+3S)/(1S) yield ratio (3S)/(2S) yield ratio backg round shape

· ·

Mass ratios of higher states fixed to PDG

(1S) resolution fixed from MC: 92 MeV/c2
Consistent with fits when leaving resolution free (both in pp and PbPb)

·

Resolution of higher states fixed to scale with mass ratio 2S = m2S/m1S 1S
Crystal Ball radiative tail fixed to MC

Guillermo Breto Rangel -

WWND 2102

7


(nS) in PbPb at sNN = 2.76 TeV
· · ·
Signal shape: sum of three Crystal Ball functions Background: 2nd order polynomial Free parameters:
(1S) mass (1S) yield (2S+3S)/(1S) yield ratio (3S)/(2S) yield ratio backg round shape

· ·

Mass ratios of higher states fixed to PDG

(1S) resolution fixed from MC: 92 MeV/c2
Consistent with fits when leaving resolution free (both in pp and PbPb)

·

Resolution of higher states fixed to scale with mass ratio 2S = m2S/m1S 1S
Crystal Ball radiative tail fixed to MC

Guillermo Breto Rangel -

WWND 2102

8


(2S+3S) Suppression

· ·

Measure (2S+3S) production relative to (1S) produPRL 107 (2011) 052302 ction Simultaneous fit to pp and PbPb data at 2.76 TeV


R

AA

(1S) (2S)

RAA[(1S)] = 0.56 RAA[(2S)] = 0.12 RAA[(3S)] = 0.03

± 0.08 ± 0.04 ± 0.04

: (stat.) ± 0.07 (syst.), (stat.) ± 0.02 (syst.), (stat.) ± 0.01 (syst.).

b-anti b


RAA J/ (1S)

·In PbPb collisions at sNN = 2.76
TeV

·Prompt J/ suppressed
Obser ved (1S) suppression consistent with melting of excited states only

·J/ from B decays suppressed

. VK_ICPAQGP_V1_quarkonia.pdf

1


-



m(Z)=91.2 GeV, =2.50 GeV m(W)=80.4 GeV, =2.14 GeV



Z pp PbPb LHC






- - «».

P. Steiberg, T. Ullrich et al. hep-exp/0503002


(. 12)
«» ? ?
LHC ? J/ PbPb ?





, QGP
· : , / , ­ (J/, Y, ,Y ,Y) ­ ­ ( ) QGP «» (

-

) . ( ) - . · , .

2