Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-31
Phys.Rev.D77:054004,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 8 figures
Scientific paper
10.1103/PhysRevD.77.054004
The Berger model of perturbative fragmentation of quarks to pions is improved by providing an absolute normalization and keeping all terms in a (1-z) expansion, which makes the calculation valid at all values of fractional pion momentum z. We also replace the nonrelativistic wave function of a loosely bound pion by the more realistic procedure of projecting to the light-cone pion wave function, which in turn is taken from well known models. The full calculation does not confirm the (1-z)^2 behavior of the fragmentation function (FF) predicted in for $z>0.5$, and only works at very large z>0.95, where it is in reasonable agreement with phenomenological FFs. Otherwise, we observe quite a different z-dependence which grossly underestimates data at smaller z. The disagreement is reduced after the addition of pions from decays of light vector mesons, but still remains considerable. The process dependent higher twist terms are also calculated exactly and found to be important at large z and/or pT.
Kopeliovich Boris Z.
Pirner Hans-Juergen
Potashnikova I. K.
Schmidt Ivan
Tarasov Victor A.
No associations
LandOfFree
Perturbative fragmentation 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 Perturbative fragmentation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perturbative fragmentation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-29591