in-medium jet modification measured by ... - indico.cern.ch · precision extraction of jet width...

In-Medium Jet Modification Measured by PHENIX Via Two Particle Correlations and High pT Hadrons in

A+A CollisionsAnthony Hodges

On Behalf of The PHENIX Collaboration

Quark Matter 2019Wuhan, China

Energy Loss in the Quark Gluon Plasma

11/5/19 Anthony Hodges PHENIX QM2019 2

Incoming Nuclei

Collision

QGP

Hadronization

Freeze out

A. M. Sickles

what happens to the energy?

• is the energy thermalized in the end?

24

gluon radiation

collisionalbroadening

→ "𝑞

→ �̂�

radiative

collisional

High momentum partons lose energy

The PHENIX Detector


West

South Side View

Beam View

PHENIX Detector2012

North

East

MuTr

MuID

RPC3

RPC1

MuID

RPC3

MPC

BBC

(F)VTX

PbSc PbSc

PbSc PbSc

PbSc PbGl

PbSc PbGl

TOF-E

PC1 PC1

PC3PC2

Central Magnet

CentralMagnet

North M

uon MagnetSouth Muon Magnet

TECPC3

BBC

(F)VTX

MPC

BB

RICH RICH

DC DC

ZDC NorthZDC South

Aerogel

TOF-W 7.9 m = 26 ft

10.9 m = 36 ft

18.5 m = 60 ft

Central Arm𝜂 < 0.35, ΔΦ − 2×90°

The Nuclear Modification Factor - 𝑅55


𝑅55 =𝜎88

𝑁:;<<𝑑>𝑁55/𝑑𝑝A𝑑𝜂𝑑>𝜎BB/𝑑𝑝A𝑑𝜂

■ This talk: Large Systems– Au+Au, U+U, Cu+Au

For small systems:Iurii MitrankovSmall Systems III



𝑅55 =𝜎88




Baryon Enhancement in Cu+Au

■ Enhancement of 𝑝 + �̅� /2 yield at moderate pT


Baryon Enhancement in A+A

■ Enhancement of 𝑝 + �̅� /2 yield at moderate pT

■ 𝑝 + �̅� /2 RAB consistent across Cu+Au and Au+Au at similar Npart11/5/19 Anthony Hodges PHENIX QM2019 8

Meson RAA Cu+Au

■ 𝑅55 for 𝐾∗ and Φ meson > 𝑅55 for 𝜋H and 𝜂 at low 𝑝A■ Difference disappears at high 𝑝A


0-20% 20-40%

Meson 𝑅55 in U+U

■ Strange quark dependence also present in U+U collisions11/5/19 Anthony Hodges PHENIX QM2019 10

O-20% 20-40%

Low 𝑝A Meson 𝑅55 in U+U

■ Strange quark dependent separation seen across wide 𝑁IJKL range


Integration Range

High 𝑝A Meson 𝑅55 In A+A

■ All meson 𝑅55’s and collision systems follow similar trend

■ 𝑅55 depends on system size, not collision species!11/5/19 Anthony Hodges PHENIX QM2019 12

partN0 100 200 300�

AAR⇥1⇤10

1

10=192 GeVNNsU+U,

>5 GeV/cT

, p0⌅

>5 GeV/cT

, p⇧

>5 GeV/cT

, pSK

=200 GeVNNsAu+Au,

>5 GeV/c, PRL101:232301T

, p0⌅

>6 GeV/cT

, pSK

=200 GeVNNsCu+Cu,

>6 GeV/cT

, pSK

|y| < 0.35

Integration Range

Hadron 𝑅55 Conclusions

■ Baryon enhancement seen in Cu+Au and Au+Au– Same 𝑅55 at similar 𝑁BJKL

■ Difference in suppression levels based on strangeness contribution to meson makeup.■ 𝑅55 for all meson species converges at high 𝑝A■ At high 𝑝A, integrated 𝑅55 behavior depends on system size,

rather than collision species


Two Particle Correlations

■ Jet widths: 𝜎MNJK, 𝜎JOJP– Broadening – Requires careful subtraction of

background flow

■ 𝐼55 =RSSRTT

– Modification of hadron yield– Will show as a function of 𝑝AU and Δϕ


𝜋H

Small systems:Jonathan RuncheyInitial State I

Precision Extraction of Jet Width

■ New results (right) from combined data from 2010 and 2011

■ v2 ,v3 ,and v4 subtracted in new results → flow contamination removed11/5/19 Anthony Hodges PHENIX QM2019 15

PRL 104 252301 (2010)

Previous PHENIX results

(rad)fD1- 0 1 2 3 4

fD/d

pair

N 0 p1/

N

0.1-

00.10.20.30.40.50.6 1 - 2 GeV/cÄ5 - 7

-H AuAu 200GeV 0p

Au+Au (2010 & 2011)200 GeV 0-20%

-hadron0p8.8% Scale Uncertainty±

PH ENIXpreliminary

New

𝑣X, 𝑣Y not subtracted𝑣>, 𝑣X, 𝑣Y subtracted

𝜋H-Hadron Correlations – 𝜎JOJP(pT)

■ Away side jet peaks are broader at low 𝑝AU±

■ Consistent with p+p widths at high 𝑝AU±


(GeV/c)T

assoc p2 4 6

Away

s

0

0.5

1 4 - 5 GeV/c

(GeV/c)T

assoc p2 4 6

Away

s

0

0.5

15 - 7 GeV/c

-Hadron0p

(GeV/c)T

assoc p2 4 6

Away

s

0

0.5

17 - 9 GeV/c

(GeV/c)T

assoc p2 4 6

Away

s

0

0.5

19 - 12 GeV/c

p+p (2015)PRD 98 072004

(GeV/c)T

assoc p2 4 6

Away

s

0

0.5

112 - 15 GeV/c

Au+Au 0-20%Au+Au 20-40%(2010 & 2011)200 GeV

subtracted4,v3,v2v

PH ENIXpreliminary

Previous PHENIX Results – Direct Photon 𝐼55

■ Direct photon-hadron correlations – Access to initial parton energy– Previous PHENIX result shown at

right

■ 𝜋H − ℎ correlations (This talk)

■ Current analyses shift from 𝐼55(𝜉) to 𝐼55(𝑝AU)

■ 𝜉 = ln abc

; 𝑧A= 𝑝AU/𝑝AAKfg


zTIncreasing Decreasing

𝜋H-Hadron Correlations – 𝐼55 𝑝AU

■ Enhancement of yield (IAA > 1) at low associate particle momentum

■ Depletion (IAA < 1) at high associate particle momentum11/5/19 Anthony Hodges PHENIX QM2019 18

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3

0-20% 20-40%

4-5 GeV/cT

Trigger p-hadron0p

200 GeV Au+Au(2010 & 2011)

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI0

1

2

3 5-7 GeV/cT

Trigger p]2p + p, 2

p - pAway side [ subtracted4,v3,v2v

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 7-9 GeV/cT

Trigger p

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 9-12 GeV/cT

Trigger p

PH ENIXpreliminary

𝐼55 =𝑌5OJP55

𝑌5OJPBB

𝜋H-Hadron Correlations – IAA(Δϕ)

■ Calculate ratio in yields between Au+Au jet function and p+p baseline

■ Shows modification to away-side jet peak at substructure level


-A+A-p+p

fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (20-40%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

5.0-7.0

9.0-12.0 GeV/cT

Trigger p

20-40%

(GeV/c)T

Associate pPH ENIXpreliminary

Δϕ





fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (20-40%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

5.0-7.0

9.0-12.0 GeV/cT

Trigger p

20-40%

(GeV/c)T

Associate p

3.0-5.0PH ENIXpreliminary

-A+A-p+p

Δϕ




■ Skirt of jet is the first to see significant enhancement


fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (20-40%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

5.0-7.0

9.0-12.0 GeV/cT

Trigger p

20-40%

(GeV/c)T

Associate p

3.0-5.02.0-3.0PH ENIX

preliminary

-A+A-p+p

Δϕ






fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (20-40%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

5.0-7.0

9.0-12.0 GeV/cT

Trigger p

20-40%

(GeV/c)T

Associate p

3.0-5.02.0-3.01.0-2.0PH ENIX

preliminary

-A+A-p+p

Δϕ





■ Most intense enhancement at wide angles


fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (20-40%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

5.0-7.0

9.0-12.0 GeV/cT

Trigger p

20-40%

(GeV/c)T

Associate p

3.0-5.02.0-3.01.0-2.00.5-1.0PH ENIX

preliminary

-A+A-p+p

Δϕ

Conclusion■ Baryon enhancement in Cu+Au

■ New hadron 𝑅55 in Cu+Au and U+U

■ System size dependence of 𝑅55■ Away-side jet yield and shape modification consistent with

energy loss via wide angle gluon radiation

■ New 𝐼55(Δϕ) probes jet modification at substructure level


fD2 3 4

AAI

0

1

2

3

4 4.0-5.0 GeV/c

TTrigger p

-hadron (0-20%)0p200 GeV Au+Au(2010 & 2011)

fD2 3 40

1

2

3

4 5.0-7.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4 7.0-9.0 GeV/c

TTrigger p

fD2 3 40

1

2

3

4

0.5-1.0

9.0-12.0 GeV/cT

Trigger p

0-20%

(GeV/c)T

Associate p1.0-2.0 2.0-3.0

3.0-5.0 5.0-7.0PH ENIXpreliminary

partN0 100 200 300

�AAR⇥

1⇤10

1

10=192 GeVNNsU+U,

>5 GeV/cT

, p0⌅

>5 GeV/cT

, p⇧

>5 GeV/cT

, pSK

=200 GeVNNsAu+Au,

>5 GeV/c, PRL101:232301T

, p0⌅

>6 GeV/cT

, pSK

=200 GeVNNsCu+Cu,

>6 GeV/cT

, pSK

|y| < 0.35

Thank you!

BACK UP


7 - Φ Meson 𝑅55 in A+A

■ Consistent 𝑅55 across collision species 11/5/19 Anthony Hodges PHENIX QM2019 26

�̅�/𝑝 Ratio in A+A

■ �̅�/𝑝 ratio consistent across Cu+Au and Au+Au11/5/19 Anthony Hodges PHENIX QM2019 27

𝜋H-Hadron Correlations – IAA(pT)


(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3

0-20% 20-40%

4-5 GeV/cT

Trigger p-hadron0p

200 GeV Au+Au(2010 & 2011)

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 5-7 GeV/cT

Trigger p]2p + p, 2


(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 7-9 GeV/cT

Trigger p

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 9-12 GeV/cT

Trigger p

PH ENIXpreliminary

Nuclear Physics A 956 (2016) 621–624

■ PHENIX 𝜋H − ℎ± IAAresults consistence with ALICE

■ STAR reports noenhancement, but lacks similar kinematic reach in its measurement to PHENIX and ALICE result

𝜋H-Hadron Correlations – IAA(pT)


(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3

0-20% 20-40%

4-5 GeV/cT

Trigger p-hadron0p

200 GeV Au+Au(2010 & 2011)

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 5-7 GeV/cT

Trigger p]2p + p, 2


(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 7-9 GeV/cT

Trigger p

(GeV/c)T

assoc p1 2 3 4 5 6 7

AAI

0

1

2

3 9-12 GeV/cT

Trigger p

PH ENIXpreliminary

Nuclear Physics A 956 (2016) 621–624

■ PHENIX 𝜋H − ℎ± IAAresults consistence with ALICE

■ STAR reports no enhancement, but lacks similar kinematic reach in its measurement to PHENIX and ALICE result

Flow Subtraction – Charged Hadron 𝑣M

■ Charged hadron 𝑣M from PHENIX data

■ Measured via event plane method 11/5/19 Anthony Hodges PHENIX QM2019 30

arXiv:1803.01749v1 (2007 data)

Flow Subtraction - 𝜋H 𝑣M

■ Taken from PHENIX data

■ Measured via reaction plane method

■ Higher order harmonics not available11/5/19 Anthony Hodges PHENIX QM2019 31

PRL 105, 142301 2010 (2007 data)2v

0

0.1

0.2

0-10%

(a)

10-20%

(b)

20-30%

(c)

2v

0

0.1

0.2

30-40%

(d)

40-50%

(e)

50-60%

(f)

0 2 4 6 8 10 12 14 16 18

Rat

io

0.60.8

11.21.4 0-20%(g)

(GeV/c)T

p0 2 4 6 8 10 12 14 16 18

20-40%

combined2/vMPC

2v combined2/vRXNin

2v

(h)

0 2 4 6 8 10 12 14 16 18

40-60%(i)

Flow Subtraction – Acoustic Scaling

■ Have charged hadron 𝑣M for (𝑛 = 2,3,4) from PHENIX results

■ No 𝜋H 𝑣X or 𝑣Y measured at RHIC energies

■ 𝑣M harmonics can be scaled to one another via value 𝑔M11/5/19 Anthony Hodges PHENIX QM2019 32

arXiv:1105.3782v2

𝑔M =𝑣M𝑣> M/>

Flow Subtraction – Acoustic Scaling

■ Can calculate 𝜋H 𝑣X, 𝑣Y by scaling 𝜋H 𝑣> with charged hadron 𝑔M


arXiv:1105.3782v2

𝑣Mlm = 𝑔MU 𝑣>l

m M/>

arXiv:1105.3782v2

Sample Jet Functions:


(rad)fD1- 0 1 2 3 4

fD/d

pair

N 0 p1/

N

0.1-

00.10.20.30.40.50.6 1 - 2 GeV/cÄ5 - 7

-H AuAu 200GeV 0p

Au+Au (2010 & 2011)200 GeV 0-20%


PH ENIXpreliminary

(rad)fD1- 0 1 2 3 4

fD/d

pair

N 0 p1/

N

0

0.05

0.1

0.15 3 - 5 GeV/cÄ5 - 7

-H AuAu 200GeV 0p

Au+Au (2010 & 2011)200 GeV 0-20%


PH ENIXpreliminary

(rad)fD1- 0 1 2 3 4

fD/d

pair

N 0 p1/

N

0.2-

0

0.2

0.4

1 - 2 GeV/cÄ7 - 9

-H AuAu 200GeV 0p

Au+Au (2010 & 2011)200 GeV 0-20%


PH ENIXpreliminary

(rad)fD1- 0 1 2 3 4

fD/d

pair

N 0 p1/

N0

0.05

0.1

0.15

0.2

0.25 3 - 5 GeV/cÄ7 - 9

-H AuAu 200GeV 0p

Au+Au (2010 & 2011)200 GeV 0-20%


PH ENIXpreliminary

0—20%𝑣2, 𝑣3, 𝑣4 subtracted

Sample Jet Functions:


(rad)fD0 2 4

fD

/dpa

ir d

N0 p

1/N

0

0.2

0.4 1.0-2.0 GeV/cÄ5.0-7.0

Au+Au (2010 & 2011)200 GeV 20-40%

-hadron0p subtracted4,v3,v2v

8.8% Scale Uncertainty±

PH ENIXpreliminary

(rad)fD0 2 4

fD

/dpa

ir d

N0 p

1/N

0

0.05

0.1

0.15 3.0-5.0 GeV/cÄ5.0-7.0

Au+Au (2010 & 2011)200 GeV 20-40%



PH ENIXpreliminary

(rad)fD0 2 4

fD

/dpa

ir d

N0 p

1/N

0.2-

0

0.2

0.4

1.0-2.0 GeV/cÄ7.0-9.0 Au+Au (2010 & 2011)200 GeV 20-40%

-hadron0p

subtracted4,v3,v2v8.8% Scale Uncertainty±

PH ENIXpreliminary

(rad)fD0 2 4

fD

/dpa

ir d

N0 p

1/N

0

0.1

0.2

3.0-5.0 GeV/cÄ7.0-9.0 Au+Au (2010 & 2011)200 GeV 20-40%



PH ENIXpreliminary

20—40%𝑣2, 𝑣3, 𝑣4 subtracted

in-medium jet modification measured by ... - indico.cern.ch · precision extraction of jet width...

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