Results from the NA50 experiment on J/$\psi$ suppression in PbPb collisions at the CERN SPS

HAL Id: in2p3-00009840

http://hal.in2p3.fr/in2p3-00009840

Submitted on 11 Jun 2001

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Results from the NA50 experiment on J/ψ suppression in PbPb collisions at the CERN SPS

M. Monteno, M. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, C.

Baglin, A. Baldit, M. Bedjidian, S. Beole, et al.

To cite this version:

M. Monteno, M. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, et al.. Results from the NA50 experiment

on J/ψ suppression in PbPb collisions at the CERN SPS. International Workshop on Multiparticle

Production “New Frontiers in Soft Physics and Correlations on the Threshold of the Third Millenium

9, Jun 2000, Torino, Italy. pp.43-54. �in2p3-00009840�

Background

’ Open charm J /

Drell-Yan

p(450 GeV/c)-p,d (NA51)*

208 16

p(200 GeV/c)-A (A=Cu,W,U) (NA38) O(16x200 GeV/c)-Cu,U (NA38)

*

S(32x200 GeV/c)-U (NA38) Pb(208x158 GeV/c)-Pb (NA50)* 32

p(450 GeV/c)-A (A=C,Al,Cu,W) (NA38)

10 10

1 10

10

10

10

B target projectile

B (J/ )/(AB) (nb)

5 4

3

2

1 0.9 0.8 0.7

0.4 0.5 0.6

A

0.06 = 0.74 RK 0.01

= 0.92

* rescaled to 200 GeV/c

MRS43 measured

208 32

Pb(208x158 GeV/c)-Pb (NA50) S(32x200 GeV/c)-U (NA38) p(200 GeV/c)-W (NA38) p(450 GeV/c)-A (A=p,d) (NA51)

0 5

10

A

1

(Drell-Yan)

projectile B _target

2 3

1 10 10 ² 10 ³ 10 ⁴

(Drell-Yan) ^{MRS 43}

*

p(450 GeV/c)-A (A=C,Al,Cu,W) (NA38)

16 32

208

Pb(208x158 GeV/c)-Pb (NA50)

S(32x200 GeV/c)-U (NA38) O(16x200 GeV/c)-Cu,U (NA38) p(450 GeV/c)-p,d (NA51)

p(200 GeV/c)-A (A=Cu,W,U) (NA38)

0

B (J/ )/(AB) (nb)

10 7.5

5 2.5

L (fm)

5

0.4 0.5 0.6 0.7 0.8 0.9 1 2 3 4

3

* rescaled to 200 GeV/c

= 6.3 1.0 mb

= 0.17 n/fm

0 5 10 15 20 25 30 35 40

0 20 40 60 80 100 120 140

E

(GeV)

B (J/ ) / (DY)

Pb - Pb 1996 with Minimum Bias Pb - Pb 1998 with Minimum Bias

0 5 10 15 20 25 30 35 40

0 5 10 15 20 25 30

E

(TeV)

B ( ) / (DY)

0 5 10 15 20 25 30 35 40

0 20 40 60 80 100 120 140

E

(GeV)

B (J/ ) / (DY)

Pb - Pb 1996 with Minimum Bias Pb - Pb 1998 with Minimum Bias

0 0.2 0.4 0.6 0.8 1 1.2 1.4

0 0.5 1 1.5 2 2.5 3 3.5

(GeV/fm

)

Measured / Expected J/ suppression

p - p(d) NA51 p - A NA38 S - U NA38 Pb - Pb 1996

Pb - Pb 1996 with Minimum Bias

Pb - Pb 1998 with Minimum Bias