STAR HardProbes PWG

[Raghav Kunnawalkam Elayavalli <kunnawalkamraghav AT gmail.com>]

Hi Nihar,

Pileup are soft collisions in addition to the main hard scattering and so they could be in essence  perturbative or non-perturbative by themselves, but they don’t belong to the jet in question yes. So I’m fine with your sentence below 

So I would prefer to say "...to mitigate non-perturbative (like hadronization and UE) and pileup effects” 

Cheers
Raghav 


**************************************
First Name - Raghav 
Last Name - Kunnawalkam Elayavalli
Pronouns - they/them
email - raghav.ke AT vanderbilt.edu 
website - https://www.raghavke.me 

RHIC/AGS UEC member
Assistant Professor of Physics
Stevenson Center 6410
Physics & Astronomy Department
Vanderbilt University 
Nashville, TN 37235-1807
**************************************

On Jun 29, 2023, at 11:57 AM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Raghav,

Yes, non-perturbative effects can be hadronization and UE. But SoftDrop also reduces the pileup effect in jets; and pileup is not a non-perturbative effect and it comes from multiple hadron scatterings.

_ "…SoftDrop used …to mitigate non-perturbative effects " ->

So I would prefer to say "...to mitigate non-perturbative (like hadronization and UE) and pileup effects"

Best
Nihar

On 2023-06-29 15:08, Raghav Kunnawalkam Elayavalli wrote:

Hi Nihar,
Just to push back on the point you raise in slide 2 - the abstract of
that paper you linked to in the bottom explicitly says -
"non-perturbative effects such as hadronization and the underlying
even”. Then in section 6 of the paper, they discuss in detail how
doing softdrop makes an observable robust to these effects which one
cannot calculate w.r.t the jet which would make something
perturbative. So it is absolutely true that "SoftDrop is used to
mitigate non-perturbative effects”
Cheers
Raghav
**************************************
First Name - Raghav
Last Name - Kunnawalkam Elayavalli
Pronouns - they/them
email - raghav.ke AT vanderbilt.edu
website - https://www.raghavke.me  [2]
RHIC/AGS UEC member
Assistant Professor of Physics
Stevenson Center 6410
Physics & Astronomy Department
Vanderbilt University
Nashville, TN 37235-1807
**************************************

On Jun 29, 2023, at 8:16 AM, Nihar Sahoo via Star-hp-l
<star-hp-l AT lists.bnl.gov> wrote:
Hello Minika,
Please find my comments on your nice overview slides.
Slide2:
_ "…SoftDrop used …to mitigate non-perturbative effects " -> In
fact this statement is not correct. SoftDorp is used to mitigate the
effect of ISR, UE and pileup. For a reference, have a look at one of
original papers  https://arxiv.org/pdf/1402.2657.pdf [1]
SLide 6and7:
As you discussed in previous slide two corrections methods:
RooUnfold and MultiFold
I would suggest to put in Title "RooUnfold Method" or similar.
Slide10:
Title "Motivation" comes abruptly after many slides. Needs to say
Motivation for/of what?
Slide12:
"…and more perturbative" -> a vague statement. Mention why you
claim this is "perturbative"? Like 1/z trend of AP, DIGLAP…?
SLide18:
In the Lund diagram, mention what is "Δ" ? and relate that with R_g
Slide19:
_"we move from non-perturbative to perturbative region" -> this is
again a vague statement. Not sure how do you claim this. Because
look at my comment slide#2.
Best
Nihar
On 2023-06-24 06:10, webmaster--- via Star-hp-l wrote:

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Monika Robotkova (robotmon AT fjfi.cvut.cz) has submitted a material
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Links:
------
[1] https://urldefense.com/v3/__https://arxiv.org/pdf/1402.2657.pdf__;!!P4SdNyxKAPE!AXhjVRnfJ_VV4CS3OHZ-j7FEue0LqD-uwhYQga3XapnVP68Ywh4lMcmti2clyHm12pRUc-8Mxh2zCXUQCHQlurUtEeFhQ4g$
[2] https://urldefense.com/v3/__https://www.raghavke.me__;!!P4SdNyxKAPE!AXhjVRnfJ_VV4CS3OHZ-j7FEue0LqD-uwhYQga3XapnVP68Ywh4lMcmti2clyHm12pRUc-8Mxh2zCXUQCHQlurUtIC90WCw$