Comparison of Particle Production in Quark and Gluon Fragmentation at sqrt s ~ 10 GeV

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

21 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD

Scientific paper

10.1103/PhysRevD.76.012005

Using data collected with the CLEO III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons (p, /) and mesons (phi and f_2(1270)) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in Upsilon(1S)->ggg compared with nearby continuum (e+e- -> qqbar) indicating greater (x2) per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the Upsilon(2S) and Upsilon(3S) resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process Upsilon(1S)->gggamma with that in e+e- -> qqbar events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the `enhancement' ratio, defined as the ratio of particle yields per gluon fragmentation event compared to quark fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in both gluon and quark fragmentation. In the photon-tagged analysis (U(1S)->gggamma compared to e+e- -> qqbar+gamma), we find almost no enhancement for protons (1.2+/-0.1), but a significant enhancement (1.9+/-0.3) for /\'s. Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the Upsilon(1S). Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Comparison of Particle Production in Quark and Gluon Fragmentation at sqrt s ~ 10 GeV does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Comparison of Particle Production in Quark and Gluon Fragmentation at sqrt s ~ 10 GeV, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparison of Particle Production in Quark and Gluon Fragmentation at sqrt s ~ 10 GeV will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-573998

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.