Paper Page of Measurement of Charge Correlator Ratio in pp
Title: Measurement of the charge correlator ratio in p+p collisions at STAR
PAs: Youqi Song, Helen Caines, Isaac Mooney
Target journal: PRD or PRC
Figures:
Fig. 1. The angular separation Delta R between the truth-level and detector-level leading (subleading) tracks in jets.
Fig. 3. Fully corrected r_c vs jet p_T, compared to event generator predictions.
Conclusions: In summary, to probe for string-like fragmentation, we measure of r_c as a function of jet p_T in sqrt{s}=200 GeV p+p collisions at STAR. On average, the data show that leading charged particles in jets are more likely to be opposite signs than same sign. (In data, opposite signs occur 65% of the time and same sign 35% of the time. In PYTHIA these fractions are 68% to 32%). Compared with predictions from event generators, the fully corrected data show a weaker correlation between the leading and subleading tracks in jets. The significant difference between HERWIG and PYTHIA in their relative fractions of fragmentation vs. resonance decays might explain why their predictions for r_c are similar despite different approaches to fragmentation.
Preliminary results: page
Public presentations:
HP 24
WWND 24
CFNS npQCD workshop
QM 23 (poster)
Presentations within STAR:
04/13/23
05/11/23
07/13/23
08/10/23
08/17/23
08/22/23: preliminary request
01/17/24
03/05/25: paper proposal
03/14/25: PWGC preview
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