J/ in pp, dAu and AuAu. Tatia Engelmore Journal Club 5/24. Outline. What can be learned from heavy quarks and J/ J/ production mechanisms Effects of a medium (dead cone, destruction and recombination) PHENIX measurements. Importance of Heavy Quarks.
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J/ in pp, dAu and AuAu
Tatia Engelmore
Journal Club 5/24
g
c
g
c
dNjet(b) = K ∫d^2 r ∑x1fa/A(x1, pT^2, r)x2 fb/B(x2, pT^2, b - r) dab/dt
dpT^2dy1dy2
2) Pre-Equilibrium Production
1)high gluon density: rescatter, partial thermalization, produce more cc pairs
2) depends on phase space density of initially produced gluons
3) up to 10% of charm production at RHIC
dP = S CF d kp^2 dkP^2
(kP^2 + ^2 o^2)^2
(1 + (o/)^2)^-2
D0
J/y
D-
u
d
r
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r
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b
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g
r
b
b
r
r
b
b
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b
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b
Dd/dy = (NJ//dy)
ArecBBC(Nevt/(BBC MB* BBC MB))
Ninv = NJ/Cbias(Ncoll)
A rec trigNevt(w/w)
Where invariant yield is:
Get pp = 2.61 0.2(fit) 0.26(abs) barns
Low x2 ~ 0.003
(shadowing region)
0 mb
3 mb
xA
dA = pp*(2A)^
x2~ 0.1
x2~ 0.01
x2~ 0.003
Bd/dy = (N J//dy)
(Nmb-evt + (lvl2-effNlvl2-evt)) (acc-effcent)
AuAu
1.2
1.0
0.8
RdA
0.6
0.4
0.2
0
Rapidity
dAu
x2~ 0.1
Low x2 ~ 0.003
(shadowing region)
0 mb
x2~ 0.01
3 mb
xA
x2~ 0.003
dAu