STAR Correlations and Fluctuations PWG

[Rutik Manikandhan <manikandhan.rutik AT gmail.com>]

Hello Sooraj,

you conclude that there is possibility of correlation length changing in-between. Do we have an understanding of why the correlator drops from 200 to 7.7 GeV? What does a large value at 3 GeV, comparable to that at 200 GeV mean? Can we directly conclude what is seen is a change in correlation length?

pt-pt Correlators are related to temp. fluctuations, and this decrease could be attributed to a decrease in temp. fluctuations, because the temp. is getting fixed and there's a latent heat in the system. 

1)Phys. Rev. C 94, 044901 (2016)

2) Phys.Rev.C 106 (2022) 1, 014910

I dont think we can directly conclude that the energy dependence we see is that due to correlation length changing, in fact the paper that I have referenced does hint to it in their statement "We do not expect F to vary strongly with energy unless the correlation length changes, e.g., from a liquid to a gas value", so the mixing of two contributions (partonic and hadronic) could possibly lead to this.

1) https://arxiv.org/pdf/nucl-th/0510011

2) https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.92.162301

Best,

Rutik Manikandhan

PhD Candidate, Experimental Nuclear High Energy Group

Physics Dept.

University of Houston

On Mon, May 13, 2024 at 12:47 PM Sooraj Radhakrishnan <skradhakrishnan AT lbl.gov> wrote:

Thanks Rutik. We have the embedding at 3 and 3.2 GeV, and there is no strong energy dependence. So you could take a look. 

On S16, you conclude that there is possibility of correlation length changing in-between. Do we have an understanding of why the correlator drops from 200 to 7.7 GeV? What does a large value at 3 GeV, comparable to that at 200 GeV mean? Can we directly conclude what is seen is a change in correlation length?

Best,

Sooraj

On Sun, May 12, 2024 at 7:18 AM Rutik Manikandhan <manikandhan.rutik AT gmail.com> wrote:

Hello Sooraj,

Thank you for the question,

Yes, R is the robust variance and it's a function of the charged particle multiplicity. We haven't tried fitting this quantity as a function of dN/deta. To do this as a function of energy we would need the efficiency corrected dN/eta of all charged particles as a function of energy. We did publish these fits as a function of Npart, hence I followed suit, but this this something we could try in the future. 

Best,

Rutik Manikandhan

PhD Candidate, Experimental Nuclear High Energy Group

Physics Dept.

University of Houston

On Sat, May 11, 2024 at 4:35 PM Sooraj Radhakrishnan <skradhakrishnan AT lbl.gov> wrote:

Hi Rutik,

   Thanks for these nice slides. 

On S.8, in the _expression_ for R, what is N here? The total multiplicity? If it is the multiplicity, have you tried power law fits as function of multiplicity? Would this give a better fit, and also explain some of the trend you see as function of energy?

Best,

Sooraj 

On Sat, May 11, 2024 at 1:03 PM Rutik Manikandhan via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Hello Conveners,

Here is the updated version: https://drupal.star.bnl.gov/STAR/system/files/RutikCPOD_ver2_0.pdf

Best,

Rutik Manikandhan

PhD Candidate, Experimental Nuclear High Energy Group

Physics Dept.

University of Houston

On Fri, May 10, 2024 at 7:06 PM Hanna Paulina Zbroszczyk via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Dear Rutik,

Following the discussion from last CF PWG meeting, please reduce the FXTMult range up to ~ 200 particles at the multiplicity plot (slide 5).

With this implemented, I sign off.

Thanks,

Hanna

Prof. Hanna Zbroszczyk, PhD, DSc, Eng.

E-mail: hanna.zbroszczyk AT pw.edu.pl
Tel: +48 22 234 5851 (office)

Address:
Warsaw University of Technology
Faculty of Physics
Nuclear Physics Division
Koszykowa 75
Office: 117b (via 115)
00-662 Warsaw, Poland

Wiadomość napisana przez Rutik Manikandhan <manikandhan.rutik AT gmail.com> w dniu 09.05.2024, o godz. 17:13:

Hello Conveners,

I have made the changes to the presentation as per the suggestions at today's meeting.

The updated version is here: https://drupal.star.bnl.gov/STAR/system/files/RutikCPOD_ver2.pdf

Best,

Rutik Manikandhan

PhD Candidate, Experimental Nuclear High Energy Group

Physics Dept.

University of Houston

On Thu, May 9, 2024 at 7:40 AM Rutik Manikandhan <manikandhan.rutik AT gmail.com> wrote:

Hello Hanna,

Thank you for your comments, I have made the changes and uploaded them at : https://drupal.star.bnl.gov/STAR/system/files/RutikCPOD_ver1.pdf

Best,

Rutik Manikandhan

PhD Candidate, Experimental Nuclear High Energy Group

Physics Dept.

University of Houston

On Wed, May 8, 2024 at 2:35 PM Hanna Paulina Zbroszczyk via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Dear Rutik,

Thanks for submitting your presentation on time.

Find below my comments to improve:

Slide 1:

Please add „Partially funded by” and add logo of DOE

Move „the” to the next line

Slide 3:

Third bullet: energies >= 7.7 -> energies \sqrt{s_{NN}} >= 7.7

If the figure was not prepared by you, add a reference

Slide 5:

Second bullet reaches the description of the Y axis from the figure, please decrease fonts or make the figure smaller.

Slide 6: 

First bullet chromodynamics.[2] -> chromodynamics [2].

Refrenie: [2] : ALICE -> [2]: ALICE

Slide 7:

S. Gavin Phys. -> S. Gavin, Phys.

Slide 8:

S. Gavin Phys. -> S. Gavin, Phys.

Slide 9:

ALICE,Eur. -> ALICE, Eur.

Slide 10:

STAR,Phys. -> STAR, Phys.

Slide 12:

S. Gavin Phys. -> S. Gavin, Phys.

 

Slide 14:

 GeV , implying -> GeV, implying

Slide 16:

Transport -> transport

Kind regards,

Hanna

prof. dr hab. inż. Hanna Zbroszczyk
E-mail: hanna.zbroszczyk AT pw.edu.pl
Tel: +48 22 234 5851 (biuro)

Adres:
Poltechnika Warszawska

Wydział Fizyki
Zakład Fizyki Jądrowej
ul. Koszykowa 75
Biuro: 117b (via 115)
00-662 Warszawa

Wiadomość napisana przez webmaster--- via Star-cf-l <star-cf-l AT lists.bnl.gov> w dniu 07.05.2024, o godz. 21:30:

Dear star-cf-l AT lists.bnl.gov members,

Rutik Manikandhan (manikandhan.rutik AT gmail.com) has submitted a material for  
a review, please have a look:
https://drupal.star.bnl.gov/STAR/node/67702

Deadline: 2024-05-20
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--

Sooraj Radhakrishnan

Research Scientist,

Department of Physics

Kent State University

Kent, OH 44242

Physicist Postdoctoral Affiliate

Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road

Berkeley, CA 94720

Ph: 510-495-2473

Email: skradhakrishnan AT lbl.gov

--

Sooraj Radhakrishnan

Research Scientist,

Department of Physics

Kent State University

Kent, OH 44242

Physicist Postdoctoral Affiliate

Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road

Berkeley, CA 94720

Ph: 510-495-2473

Email: skradhakrishnan AT lbl.gov