Rapidity alignment and p(T) compensation of particle pairs in hadronic Z0 decays
Collaboration
15 pages
Published in:
- Phys.Lett.B 533 (2002) 243-252
e-Print:
- hep-ex/0204038 [hep-ex]
Report number:
- CERN-EP-2002-023
Experiments:
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Citations per year
Abstract: (Elsevier)
Observation is made of rapidity-alignment of K + K − and p p ̄ pairs which results from their asymmetric orientation in rapidity, with respect to the direction from primary quark to antiquark. The K + K − and p p ̄ data are consistent with predictions from the fragmentation string model. However, the p p ̄ data strongly disagree with the conventional implementation of the cluster model. The non-perturbative process of ‘gluon splitting to diquarks’ has to be incorporated into the cluster model for it to agree with the data. Local conservation of p T between particles nearby in rapidity (i.e., p T compensation) is analysed with respect to the thrust direction for π + π − , K + K − , and p p ̄ pairs. In this case, the string model provides fair agreement with the data. The cluster model is incompatible with the data for all three particle pairs. The model with its central premiss of isotropically-decaying clusters predicts a p T correlation not seen in the data.Note:
- 15 pages, 5 figures, Accepted by Phys. Lett. B Report-no: CERN-EP-2002-023 Journal-ref: Phys. Lett. B 533 (2002) 243-252
- electron positron: colliding beams
- electron positron: annihilation
- Z0: electroproduction
- Z0: hadronic decay
- K: pair production
- p: pair production
- pi: pair production
- rapidity: alignment
- transverse momentum: correlation
- string model
References(12)
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