STAR Correlations and Fluctuations PWG

["Ball Cap, Jonathan Gonzalo" <jballcap AT Central.UH.EDU>]

Dear Nu Xu and All,

 

Regarding your first question on slide 14.

Based on previous studies, it has been observed a convergence of freeze-out parameters as the \sqrt{s_{NN}} decreases, this convergence is attributed to the presence of a critical point, where it is expected a common freeze-out from different quark content. This also means that any partonic order parameter should also converge in a 1^st order phase transition region. At 3GeV the system is dominated by hadronic interactions, which means that the partonic masses should not affect the values of the obtained freeze-out temperatures.

 

Regarding you second question.

Yes, I use kaons in both non-strange and strange hadrons fits, the inclusion of kaons in the light fit was done in order to avoid too few degrees of freedom in the fit and has no effect in the extracted freeze-out temperature. This is justified from Ref(D. Magestro, J. Phys. G, Nucl. Part. Phys. 28 (2002) 1745.), where it is shown that kaon yield is insensitive to the temperature.

 

Best regards,

Jonathan Ball

 

 

From: Nu Xu via Star-cf-l
Sent: Tuesday, October 25, 2022 11:42 AM
To: Xiaofeng Luo; STAR Correlations and Fluctuations PWG
Subject: Re: [Star-cf-l] STAR presentation by Jonathan Gonzalo Ball Cap for DNP 2022 submitted for review

 

Hi Jonathan and All,

I have a question on your slide 14 -  Flavor dependence of the cumulant ratios: In the slide, you show that the value of the chemical freeze-out temperature strongly dependent on either light quark hadrons or strange quark hadrons in high energy collisions, but not the case for the 3 GeV Au+Au collisions.
Do we understand why so?

At lower energy collisions, the s-quark is relatively heavier compared to the temperature of the medium, the flavor dependence is expected to be stronger, But the data shows the opposite effect.
Another related question is that did you use the kaons in both non-strange and strange hadrons in the fit?

Thank you,

Nu 

> On Oct 24, 2022, at 9:31 PM, Xiaofeng Luo via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:
>
> Hi Jonathan,
>
>     Nice presentation.
>     I have one minor suggestion.
>     Slide 11, please add systematic uncertainties (You may contact Yu Zhang) on the proton cumulant ratios.
>     With those implemented, I sign off.
>
> Thank you,
> Best Regards,
> Xiaofeng
>
> On 2022/10/21 12:53 AM, webmaster--- via Star-cf-l wrote:
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>> Jonathan Gonzalo Ball Cap (jballcap AT central.uh.edu) has submitted a material
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