TITLE

Global analysis of π± and K± fragmentation functions and their application to top quark decays considering new BABAR and Belle experimental data

AUTHOR(S)
Nejad, S. Mohammad Moosavi; Soleymaninia, M.; Khorramian, A.N.
PUB. DATE
January 2017
SOURCE
Canadian Journal of Physics;Jan2017, Vol. 95 Issue 1, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recently, the Belle and BABAR collaborations published the single-inclusive electron-positron annihilation data at the center of mass energies () of 10.52 and 10.54 GeV, respectively. These new data offer one the possibility to determine the nonperturbative initial conditions of fragmentation functions (FFs) much more accurately. Here, we extract the FFs of π± and K± particles at next-to-leading order (NLO) including these new data, which are in the regions of larger scaled-energy z and lower . However, the π± and K± FFs were calculated previously, but our new analysis shows that adding these new data, for instance, changes the (u, s) → π+ FFs in the large- z region while the s → π+ FF is also changed at low z. These new data also change the u → K+ FF at low z ( z < 0.2) more than at large z, but the d → K+ FF is affected at z > 0.07. The FF of g → K+ is decreased everywhere, for example, about 25% at z = 0.01. We also apply, for the first time, the extracted FFs to make our predictions for the scaled-energy distributions of π± and K± inclusively produced in top quark decays at NLO.
ACCESSION #
120530343

 

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