recent heavy flavor results from phenix. silva_c/da silva.pdfrecent heavy flavor results from...
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Cesar Luiz da Silva - EMMI Workshop - LBNL 20131
INT – Heavy Flavor and Electromagnetic Probes in Heavy Ion Collisions.
Seattle, Sep-19-2014
Recent Heavy Flavor Results
from PHENIX.
A personal review …Cesar Luiz da Silva
b
<0.01fmb bottom quark
c
<0.07fmc charm quark
high pT jetd
u
quark or gluon jet
thermalized QGP ~5 fm~0.6fm
0.4 fm
d-b
d
u
u
~20 fm
1.5 fm
cu
d-
c
d-c
D meson dissociation, coalescence,drag
d-
c
120 μm
decay
decay
u
u
d u
u-d-
fragment
b bu b d-
b
d-b B meson dissociation, coalescence,drag
u
numbers fromA.Adil, I.Vitev, PLB649 (2007)
2
5/21/2014 3
Multiple interactions
Radiation, recombinations
Parton energy loss
cc
c
Coalescence, Regeneration
Gluon saturation
from direct photonyield
Need several measurements to isolate different
effects.
Melting temperaturearXiv:1404.2246
5/21/2014C. L. da Silva - Quark Matter 2014,
Darmstadt Germany4
5/21/2014C. L. da Silva - Quark Matter 2014,
Darmstadt Germany5
197Au79+197Au79
7, 9, 11, 15, 20, 27, 39, 62, 130, 200.0 GeV/nucleon
d+197Au79
200 GeV/nucleon63Cu29+63Cu29
22, 62, 200 GeV/nucleon
p↑+p↑
62, 200, 500, 510 GeV/nucleon63Cu29+197Au79
200 GeV/nucleon238U92+238U92
193 GeV/nucleon
Can collide any species combination from proton(polarized) to uranium.
RHIC Ions – 6 species and 15 energies to date
e
LEPTONS iN PHENIX DETECTOR
69/19/2014 Cesar L. da Silva - LANL - PHENIX HF
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 7
Sources of HF at RHIC
From PYTHIA
8
deuteron
Au
PHENIX
Vitev: coherent effect+CroningDB
μ
X
DBμ
X
DBe
X
Heavy Flavor Results in d+Au Collisions
arXiv:1310.1005arXiv:1310.1005
PRL109, 242301 (2012)
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
x~5x10-3x~8x10-2
x~10-2
Au
DBμ
X
99/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Heavy Flavor Results in d+Au Collisions
Au
DBμ
X
109/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Heavy Flavor Results in d+Au Collisions
Au
DBμ
X
119/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Heavy Flavor Results in d+Au Collisions
Au
DBμ
X
129/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Heavy Flavor Results in d+Au Collisions
13
d+Au Heavy Flavor Comparison with EPS09s
arXiv:1310.1005
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
?
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 14
Not a surprise given the limited CNM coverage of DIS in EPS09.
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 15
Phys. Rev. C. 89, 034915 (2014)
JdA(2.7<Δϕ<3.2 ) = 0.433 ± 0.087 (stat) ± 0.135 (syst)
Forward-mid rapidity HF
correlation
x~10-2
Back-to-back dominated by gluon fusion.Continuum dominated by flavor excitation, gluon splitting.
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 16
JdA(2.7<Δϕ<3.2 ) = 0.433 ± 0.087 (stat)± 0.135 (syst)
Forward-mid rapidity HF
correlation
x~10-2
Suppression in JdA stronger than in smaller x single muons.HF from gluon fusion has a stronger suppression.
Ivan (shadowing+Cronin+E-loss)
x~5x10-3
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PHENIX
PHENIXDBe
X
Light/Heavy quark comparison
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
18
Final state modification of light and heavy quarks are consistentwithin uncertainties.Is (RdA)2 a valid representation of CNM effects in A+A ?
J. M Durham, PhD thesis,SBU (2011)
Light/Heavy quark comparison
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Modification in Cu+Cu is an interplay between d+Au and Au+Au mid-
rapidity results.
RAA(pT) indicates a strong contribution from CNM effects.
Model including partonic fracgmentation and dissociation E-loss,
shadowing and Cronin underestimates low-pT RAA by at least 20%.
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RAA vs. pT vs. Npart vs. system size
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Phys. Rev. C 90, 034903 (2014)
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 20
RAA vs. pT vs. Npart vs. Energy
Large HF enhancement when going to lower energies.
Largely underestimated by E-loss+shadowing+Cronin based models.
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 21
How CNM effects factorize in A+A collisions ?
A big challenge when estimating and interpreting RAA..
22
R=
Cu
-go
ing
RA
A/
Au
-go
ing
RA
A
arXiv:1404.1873CNM = EPS09 +
4mb breakup
Rapidity dependence of CNM and QGP effects is not symmetric.
PHENIX is analyzing HF in Cu+Au (no breakup, formation time easier to understand). First FVTX data.
• Cu-going probes small-x in Au• Au-going probes small-x in Cu initial state effects cause R to
decrease with centrality
• Final state effects causes more suppression in Au-going side Final state effects should increase R with centrality
Disentangling CNM effects in HI
collisions
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF 23
PERSPECTIVES
• HF analysis using run11 Au+Au and run12 Cu+Au going on. Will be the first RAA and flow results from separated charm and bottom quarks by PHENIX.
• Run14 Au+Au results are very promising• More data than all previous runs combined• Vertex detectors (VTX and FVTX) fully operational.
• Run15 p+A (Al,Cu,Au) can be the basis CNM measurement for high energy hadron collisions
• A-dependence can help distinguish the role of saturation, coherent effects(shadowing) and energy loss
• It will be a better reference for Cronin effect
• Future detectors need to emphasize large coverage and precision in order to disentangle CNM and QGP effects
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BACKUP SLIDES
259/19/2014 Cesar L. da Silva - LANL - PHENIX HF
26
Charmonia suppression in d+Au
PRL111, 202301 (2013)
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
27
PRL111, 202301 (2013)
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
28
Mid- and large rapidity J/Psi RAA
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
Models calculated for y=0
Data don’t rule out most of coalescence/regeneration models.
Trend for increasing v2 at high pT ? 29
J/Psi azimuthal anisotropy at 1.2<|y|<2.2
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
30
1.2<y<2.2
Cu+Au
5/21/2014 31
Is RAA also Asymmetric ?arXiv:1404.1873
C. L. da Silva - Quark Matter 2014, Darmstadt Germany
32
Is RAA also Asymmetric ?
arXiv:1404.1873
33
J/Psi RAA in U+U collisions
U+U allows:
• higher energy density
• more room for recombination
• different geometry9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
34
Near Future Results
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
35
Upsilons in sPHENIX
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36
HF larger than EPS09
at backward direction
J/𝜓 more suppressed
than HF at mid- and
backward.
Hint for final state effect.
Scale of the HF RAA with Npart.
𝜓’ relative suppression suggests nuclear
absorption from comover.
J/𝜓 v2 still consistent with
many charm coalescence
scenarios.
9/19/2014 Cesar L. da Silva - LANL - PHENIX HF
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