Title: Azimuthal transverse single-spin asymmetries of inclusive jets and identified hadrons within jets from polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV

PA: J.K. Adkins, J.L. Drachenberg, R. Fatemi, C.A. Gagliardi, and T. Lin

Target Journal: Phys. Rev. D

Abstract:  The STAR Collaboration reports a new measurement of the transverse single-spin asymmetries for inclusive jet and identified hadron + jet production at midrapidity from transversely polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV, based on the data taken during 2012 and 2015.  The inclusive jet asymmetry measurements include $A_N$ for inclusive jets and $A_N$ for jets containing a charged pion carrying a fraction $z>0.3$ of the jet momentum.  The identified hadron + jet asymmetry measurements include the Collins effect for charged pions and kaons and the Collins-like effect for charged pions.  The measured asymmetries are determined for several distinct kinematic regions, defined by the jet transverse momentum ($p_{T}$) and pseudorapidity $\eta$, as well as the particle's momentum fraction $z$ and momentum transverse to the jet axis ($j_{T}$). These results probe higher momentum scales (up to $\sim$ 900 $\mathrm{GeV^{2}}$) than current measurements from semi-inclusive deep inelastic scattering.  They provide new constraints on quark transversity in the proton and enable tests of evolution, universality and factorization breaking in the transverse momentum dependent (TMD) formalisms.

HepData:
    https://www.hepdata.net/record/ins2087127

Paper Draft:

    Final Published Version (DOI:https://doi.org/10.1103/PhysRevD.106.072010)

    arXiv:2205.11800 [hep-ex]    

    Page Proof Cover (2nd version)
    Page Proof Cover (first version)
    Readline Proof

    Version-2022-09-14 (With author list)
    Version-2022-09-06 (With second round Referee's comments, reply to Referee)
    Version-2022-08-10 (With Referee's comments, reply to Referee)
    Version-2022-05-18 (For Collaboration Review)
    Version-2022-04-30  (For Collaboration Review, with Comments from Indiana, VU, UCR, Lehigh, ANL)
    Version-2022-04-25 (For Collaboration Review, with Comments from Indiana, VU, UCR, Lehigh)
    Version-2022-03-25 (For Collaboration Review)
    Version-2022-03-13 (For GPC Review)
    Version-2022-03-04 (For GPC Review)
    Version-2022-02-18 (For GPC Review)
    Version-2021-11-23 (For GPC Review)
    Version-2021-11-17 (For ColdQCD Group Review)
    Version-2021-11-13 (For ColdQCD Group Review)
    Version-2021-11-01 (For ColdQCD Group Review)
    Version-2021-10-03
    Version-2020-11-06
    Version-2020-09-24

Analysis Note:
   Official Link to psn0782: https://drupal.star.bnl.gov/STAR/starnotes/private/PSN0782

   2012: Version-2019-07-08

   2015: Version-2022-01-27
             Version-2021-11-17
             Version-2021-11-09
             Version-2020-11-06
    

Collaboration Review:
   Comments from Indiana University and our reply (word version, PDF version)

   Comments from Valparaiso University and our reply (word version, PDF version)

   Comments from UC-Riverside and our reply (word version, PDF version)

   Comments from Lehigh and our reply (word version, PDF version)

   Comments from ANL and our reply (word version, PDF version)

Code:
    All the code is available:
    https://www.star.bnl.gov/cgi-bin/protected/viewvc.cgi/cvsroot/offline/paper/psn0782/

Flow Chart of the analysis:

Presentations:
   2015: Slides to PWGC group 2020-10-15
   2015: Preliminary request to SpinPWG on 2020-02-26

Outside the Collaboration:
   2015:
   BNL Nuclear Physics Seminar on 2020-06-30
   Jet Observables at the EIC on 2020-07-29

Proposed Figures:
Fig.1: Kinematic coverage; Fig.2: Reaction plane:

Fig.3: jT upper cuts:

Fig.4: jet data and embedding; Fig.5: track z; Fig.6: jT plots:
 

Fig.7: PID plots

Fig.8: pi,k,p,e fractions in jet Pt: 8.4~9.9 GeV/c, pion-rich region:

Fig.9: jet phi_H distribution before and after the eta correction

Fig.10: Inclusive jet asymmetries

Fig.11: Inclusive jet asymmetry for charged pions inside jets:



Fig.12, Fig.13: Collins-like asymmetries
 

Fig.14, Collins asymmetry 2012 and 2015

Fig.15, Fig.16, Fig.17, Fig.18: Collins asymmetries 

Fig. 19: Collins asymmetry vs. jT in z bins for 500 and 200 GeV; Fig. 20: Collins asymmetry for 500 and 200 GeV 

Fig. 21: Collins asymmetry for Kaons and Protons vs. jet Pt, z, jT

Fig. 22

Fig. 23

Fig.24