Title:
First measurements of the invariant jet mass in p+p collisions at \sqrt{s} = 200 GeV at STAR

Abstract:
We present the first inclusive measurements of the invariant and SoftDrop jet mass in proton-proton collisions at $\sqrt{s}=\unit[200]{GeV}$ at STAR. The measurements are fully corrected for detector effects, and reported differentially in both the jet transverse momentum and jet radius parameter. We compare the measurements to established leading-order Monte Carlo event generators and find that STAR-tuned PYTHIA-6 reproduces the data, while LHC tunes of PYTHIA-8 and HERWIG-7 do not agree with the data, providing further constraints on parameter tuning. Finally, we observe that SoftDrop grooming, for which the contribution of wide-angle non-perturbative radiation is suppressed, shifts the jet mass distributions into closer agreement with the partonic jet mass as determined by both PYTHIA-8 and a next-to-leading-logarithmic accuracy perturbative QCD calculation. These measurements complement recent LHC measurements in a different kinematic region, as well as establish a baseline for future jet mass measurements in heavy-ion collisions at RHIC.

PAs:
Isaac Mooney¹, Joern Putschke¹, Raghav Kunnawalkam Elayavalli¹
1- Wayne State University, Detroit MI

Journal:
Phys. Rev. D 104, 052007 (2021)

Collaboration review:
UCB/SSL
NCKU
UT Austin
CTU
PSU

GPC:
Chairperson: Sevil Salur
Member at large: Zilong Chang
English QA: Ernst Sichtermann
Code QA: Daniel Nemes
PA Rep: Isaac Mooney 
PWG Rep: Saehanseul Oh

GPC meetings:
Friday, April 17th, 2020, 13:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Friday, July 10th, 2020, 13:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Thursday, July 23rd, 2020, 13:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Thursday, August 6th, 2020, 13:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Thursday, August 20th, 2020, 13:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Tuesday, September 15th, 2020, 12:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments
Tuesday, October 6th, 2020, 12:00 EST
BlueJeans meeting ID: 582 720 509
Slides link
Comments

Paper draft:
PRD submission v2

arXiv link:
arXiv:2103.13286

Comments on previous drafts:
JetCorr v1: Helen
JetCorr v2: Hanseul
JetCorr v3: compiled
JetCorr v4: Zilong 
GPC v1: Ernst (implemented in v2); Hanseul, Sevil (implemented in v3)
GPC v3: Sevil, Hanseul, Zilong
GPC v4: Sevil, Zilong, Ernst
GPC v6: Stanislav Vokál, CTU, NCKU, UCBSSL, UT
IR v1: Norbert Schmitz
PRD v0: Referee 1
PRD v1: Referee 1

Paper code directory:
PSN0743

HepData:
10.17182/hepdata.102953

Analysis note:
GPC v4

Paper proposal talk:
v1

Paper plots:
Fig. 1
Fig. 2
Fig. 3
Fig. 4a
Fig. 4b
Fig. 5a
Fig. 5b
Fig. 6
Fig. 7

Public presentations on behalf of the STAR collaboration:
High-pT - Knoxville, TN March, '19
DNP - Crystal City, VA October, '19
QM - Wuhan, China November, '19
HP - Austin, TX (virtual) June, '20

JetCorr presentations:
Nov. 5, '18
Jan. 18, '19
Mar. 8, '19
Aug. 16, '19
Sep. 30, '19