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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


Melting temperature

arXiv:1404.2246

from direct photon

yield

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


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


Asymmetric Collisions

Cu+Au

-2.2<y<-1.2

1.2<y<2.2

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


Cu+Au

-2.2<y<-1.2

1.2<y<2.2

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


Is RAA also Asymmetric ?

arXiv:1404.1873

Au-going

Cu-going

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


Is RAA also Asymmetric ?

arXiv:1404.1873

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


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


  • 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


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


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


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


ϒ(1S+2S+3S) Npart dependence

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


ϒ(1S+2S+3S) RAA

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


Comparison with CMS result

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


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


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


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


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


BACKUP SLIDES

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


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


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


Comparison with J/ψ

J/ψ |y|<0.35

10% global

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


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