STAR HardProbes PWG

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi Subhash,

I'm sorry I was unable to attend the HP meeting where your analysis preview was shown, but looking through your slides, I have a few questions.  The first is, why are you using the ZDC rather than than the EPD?  The latter will give you much better EP resolution with its larger acceptance, and still has a significant eta gap.  Cross-checks are of course, always useful.

Secondly, I don't think I would consider a 5 GeV cluster that only requires a 2 GeV track a jet.  I think we really need to be careful in what we are doing - the main point is that a jet is an object whose cross-section can be calculated with a reasonable degree of accuracy using pQCD.  That line is a bit squishy, but 5 GeV is on the low side.  However, the much bigger issue is the one of combinatorial jets - even with the smaller isobar system that selection will be dominated by this.  While Tristan's toy model studies on the issue were for v2, I can't imagine that it would be so different for v1.  So we'd have to be careful to remove the combinatorial jets, and to show that the background subtraction is reasonable.

When I look at your figure on slide 9 for the Zr-Zr, at ~5 GeV there seems to be a huge difference between the requirement of 2 GeV or 3 GeV leading track, which indicates that you still have a large background contribution.  For Sooraj's earlier analysis, with 7 - 10 GeV hadrons, I think we can be much more certain of the physics processes that were selected. 

I think it is really interesting and important to understand where the D v1 comes from - as you show in your slides we naively believe that hard processes should not have any intrinsic v1, and thus anything we see should be due to medium interactions....  But I think this is what makes the D0 measurement so interesting, it is far largely than one would expect for this naive assumption.  It would be really interesting to have a second hard process to compare.  Due to the complicated nature of the physics, it would be good to focus on a kinematic region that is really dominated by the hard process.

Cheers,

Rosi

On Wed, Apr 5, 2023 at 8:16 AM subhash via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear All,

Please find the link to our presentation for tomorrow:
https://drupal.star.bnl.gov/STAR/system/files/Jet_v1_HP_6April_2023.pdf

Thanks and regards,
Subhash

On 2023-04-04 10:44 PM, Nihar Sahoo via Star-hp-l wrote:
> Hello Presenters,
>
> Please send your presentation slides a few hrs before the meeting.
>
> Thank you
> Nihar
>
> On 2023-04-04 18:25, tc88qy via Star-hp-l wrote:
>> Hello All,
>>
>>    I'd like to present a J/psi measurement in isobar system.
>>
>> Best regards,
>> Qian Yang
>>
>> On 2023-04-03 19:55, Kikoła Daniel via Star-hp-l wrote:
>>> Dear All,
>>>
>>> I'd like to present a study of D0-D0bar azimuthal correlation in
>>> Au+Au
>>> 200 GeV (run 14 and 16).
>>>
>>> Best regards,
>>>
>>> Daniel
>>>
>>> -------------------------
>>>
>>> From: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov> on behalf of Dandan
>>> Shen via Star-hp-l <star-hp-l AT lists.bnl.gov>
>>> Sent: Monday, April 3, 2023 1:36:26 PM
>>> To: 张炜; STAR HardProbes PWG
>>> Cc: STAR HardProbes PWG
>>> Subject: Re: [Star-hp-l] HP-pwg meeting Thursday (6th Apr) 10 AM, BNL
>>> time
>>>
>>> Dear All,
>>> I would like to give a talk on the measurements of J/ψ polarization
>>> in Isobar data.
>>>
>>> Best
>>> Dandan
>>>
>>> 发件人："张炜 via Star-hp-l" <star-hp-l AT lists.bnl.gov>
>>> 发送日期：2023-04-03 17:43:50
>>> 收件人：Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>,STAR HardProbes PWG
>>> <star-hp-l AT lists.bnl.gov>
>>> 主题：Re: [Star-hp-l] HP-pwg meeting Thursday (6th Apr) 10 AM, BNL
>>> time
>>>
>>>> Dear All,
>>>>
>>>> I would like to give an update for pp inelastic cross section and
>>>> finalized efficiency at AuAu27GeV.
>>>>
>>>> Best regards,
>>>> Wei
>>>>
>>>> ------------------ Original ------------------
>>>>
>>>> From:  "STAR HardProbes PWG"<star-hp-l AT lists.bnl.gov>;
>>>> Date:  Mon, Apr 3, 2023 03:22 PM
>>>> To:  "Nihar Sahoo"<nihar AT rcf.rhic.bnl.gov>; "STAR HardProbes
>>>> PWG"<star-hp-l AT lists.bnl.gov>;
>>>>
>>>> Subject:  Re: [Star-hp-l] HP-pwg meeting Thursday (6th Apr) 10 AM,
>>>> BNL time
>>>>
>>>> Dear All,
>>>>
>>>> I would like to present the update of my HFE analysis at 54.4 GeV.
>>>>
>>>> Best regards,
>>>> Veronika
>>>>
>>>> пн, 3 апр. 2023 г. в 08:33, Nihar Sahoo via Star-hp-l
>>>> <star-hp-l AT lists.bnl.gov>:
>>>>
>>>>> Hello All,
>>>>>
>>>>> We will have our HP-pwg meeting this Thursday (6th Apr) at 10 AM
>>>>> EDT.
>>>>> Let us know please if you want to present and discuss your
>>>>> analysis or
>>>>> any other business.
>>>>>
>>>>> If you plan to submit an abstract for QM2023, please send a title
>>>>> and a
>>>>> brief abstract to hp-pwg.
>>>>>
>>>>> QM2023 deadlines
>>>>> * April 3rd: deadline for express of interests to PWG via email.
>>>>> Please
>>>>> submit a title and a brief abstract on what you propose to
>>>>> present.
>>>>> * April 3rd – 17th: merging discussion within/across PWGs, and
>>>>> PAs
>>>>> submit merged abstracts to Drupal after converging
>>>>> * April 17th – 24th: PWG comments and approval
>>>>> * April 24th – May 1st: discussion and approval within
>>>>> star-talks. All
>>>>> the abstracts will be submitted centrally to the conference by
>>>>> PAC.
>>>>>
>>>>> HP working group weekly meeting info:
>>>>>
>>>>
>>> https://drupal.star.bnl.gov/STAR/pwg/Hard-Probes/Weekly-HP-PWG-meeting
>>>>>
>>>>> Join ZoomGov Meeting
>>>>>
>>>>
>>> https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09
>>>>> [1]
>>>>>
>>>>> Meeting ID: 161 141 9615
>>>>> Passcode: 744968
>>>>>
>>>>> Regards,
>>>>> Barbara, Yi and Nihar
>>>>> _______________________________________________
>>>>> Star-hp-l mailing list
>>>>> Star-hp-l AT lists.bnl.gov
>>>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l
>>>
>>>
>>>
>>> Links:
>>> ------
>>> [1]
>>> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09__;!!P4SdNyxKAPE!HBWL16b6e3kmDCq_6FCea6AoDFrTi2-cwlCDyYn2wsWvbiWwNyM7GCIdSxklkIx_wUeDab4__9HjfYqcz1xKiLLB0b-uxA$
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--

Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
16 Memorial Drive East Office 406
Bethlehem, PA 18015
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