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Quarkonia Measurement Updates from PHENIX. Cesar Luiz da Silva Los Alamos National Lab for the PHENIX Collaboration. Melting temperature. arXiv:1404.2246. from direct photon yield. Multiple interactions. Competing effects on Quarkonia R AA. Melting temperature. arXiv:1404.2246.

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Quarkonia measurement updates from phenix

Quarkonia Measurement Updatesfrom PHENIX

Cesar Luiz da Silva

Los Alamos National Lab

for the PHENIX Collaboration


Quarkonia measurement updates from phenix

Melting temperature

arXiv:1404.2246

from direct photon

yield

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Multiple interactions

Competing effects on Quarkonia RAA

Melting temperature

arXiv:1404.2246

Coalescence, Regeneration

c

Radiation, recombinations

c

c

c

Parton energy loss

from direct photon

yield

Gluon saturation

Need several measurements to isolate different effects.

C. L. da Silva - Quark Matter 2014, Darmstadt Germany



Rhic ions 6 species and 15 energies to date
RHIC Ions – 6 species and 15 energies to date

197Au79+197Au79

7, 9, 11, 15, 20, 27, 39, 62, 130, 200.0GeV/nucleon

d+197Au79

200GeV/nucleon

63Cu29+63Cu29

22, 62, 200GeV/nucleon

p↑+p↑

62, 200, 500, 510 GeV/nucleon

63Cu29+197Au79

200GeV/nucleon

238U92+238U92

193GeV/nucleon

Can collide any species combination from proton(polarized) to uranium.

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


System geometry study with j
System Geometry Study with J/ψ->μ+μ-

1.2<|y|<2.2

preliminary

U

U

arXiv:1404.1873

Au

Cu

|y|<0.35

Higher mass quarkonia with ϒ->e+e-

arXiv:1404.2246

Au

Au

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


System geometry study with j1
System Geometry Study with J/ψ->μ+μ-

1.2<|y|<2.2

U

U

  • Differences from Au+Au collisions

  • Maximum number of nucleons participants 15% larger than Au+Au

  • larger energy density

  • parton modification function


System size study
System Size Study

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Asymmetric Collisions

Cu+Au

-2.2<y<-1.2

1.2<y<2.2

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Cu+Au

-2.2<y<-1.2

1.2<y<2.2

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Is RAA also Asymmetric ?

arXiv:1404.1873

Au-going

Cu-going

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Is RAA also Asymmetric ?

arXiv:1404.1873

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Is RAA also Asymmetric ?

arXiv:1404.1873

CNM = EPS09 + 4mb breakup

  • Cu-going probes small-x in Au

  • Au-going probes small-x in Cu

  • initial state effects cause R to decreasewith centrality

  • Final state effects causes more suppression in Au-going side

  •  Final state effects should increase R with centrality

R = Cu-going RAA / Au-going RAA

Awaiting for a full model calculation including different CNM and QGP sources.

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

  • More U+U and Cu+Au studies are coming up:

  • pT and azimuthal dependence of J/ψ yields

  • Open heavy flavor

arXiv:1404.1873

Cu-going RAA / Au-going RAA

CNM = EPS09 -> Glauber

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Bottomonia

  • Extend the QGP thermometer.

  • Number of heavy flavor pairs formed in a central Au+Au collision

  • at RHIC:

b

b

c

c

c

c

Coalescence is disfavored for ϒ familyat RHIC.

b

b

Regeneration could be the same as charmonium.

b

b

b

b

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

ϒ(1S+2S+3S) Measurements

p+p

arXiv:1404.2246

Au+Au

  • clear 1S+2S+3S peaks observed in p+p and Au+Au events

  • well know background and corresponding systematics, thanks to the broad di-electron mass range coverage

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

ϒ(1S+2S+3S) in p+p 200GeV

arXiv:1404.2246

R.Vogt, PRC87,014908 (2013)

PHENIX measure rapidity dependent ϒcross section.

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

ϒ(1S+2S+3S) Npart dependence

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

ϒ(1S+2S+3S) RAA

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Comparison with CMS result

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

ϒ(1S+2S+3S) RAA

What would be the maximum RAA (zero CNM effect) if ϒexcited states are completely suppressed ?

Complete suppression of 2S and 3S

Complete suppression of 2S,3S and χB

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Comparison with Models

M. Strickland and D. Bazow, Nucl.Phys. A879, 25(2012)

A. Emerick, X. Zhao, and R. Rapp, Eur.Phys.J. A48, 72(2012)

Potential B=potential A + entropy contribution to the free energy

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Comparison with Models

  • Needs more statistics for a conclusive result

  • High-statistics 2014 run (> x2 increase in statistics in half of the run)

  • 50 billion Au+Au events and full azimuthal coverage in sPHENIX

M. Strickland and D. Bazow, Nucl.Phys. A879, 25(2012)

A. Emerick, X. Zhao, and R. Rapp, Eur.Phys.J. A48, 72(2012)

Potential B=potential A + entropy contribution to the free energy

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Summary

  • System Size Study

  • J/ψ RAA is consistent between different colliding systems

  • differences are in the level of ~20%, despite expected variations in the CNM and QGP effects

  • results can help to weight the different sources of J/ψ suppression

  • ϒ(1S+2S+3S) Measurement

  • first ϒ family result from PHENIX, where coalescence may not happen

  • result shows consistency with CMS result and models that include suppression of excited states

  • more precise data is needed to confirm the observation and favor scenarios

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

BACKUP SLIDES

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

QGP Thermometer

arXiv:1404.2246

27 references

  • Studies adopted different

  • calculation techniques

  • Tc

  • Use of internal energy or free energy for the system

  • Definition of dissociation point

from direct photon

yield

Large effort from theoretical side to calibrate the thermometer

Overall, ground states J/ψ and ϒ(1S) are not suppressed at RHIC.

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Asymmetric Collisions

Cu+Au

spectator density

-2.2<y<-1.2

1.2<y<2.2

C. L. da Silva - Quark Matter 2014, Darmstadt Germany


Quarkonia measurement updates from phenix

Comparison with J/ψ

J/ψ |y|<0.35

10% global

C. L. da Silva - Quark Matter 2014, Darmstadt Germany