Research output: Contribution to Journal/Magazine › Journal article › peer-review
Measurements of the structure of quark and gluon jets in hadronic Z decays. / ALEPH Collaboration, The; Barate, R.; Betteridge, Andrew et al.
In: European Physical Journal C: Particles and Fields, Vol. 17, No. 1, 10.2000, p. 1-18.Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Measurements of the structure of quark and gluon jets in hadronic Z decays
AU - ALEPH Collaboration, The
AU - Barate, R.
AU - Betteridge, Andrew
AU - Bowdery, Christopher
AU - Colrain, Paul
AU - Finch, Alexander
AU - Foster, Frank
AU - Hughes, Gareth
AU - Jones, Roger
AU - Williams, Mark
PY - 2000/10
Y1 - 2000/10
N2 - An experimental investigation of the structure of identified quark and gluon jets is presented. Observables related to both the global and internal structure of jets are measured; this allows for tests of QCD over a wide range of transverse momentum scales. The observables include distributions of jet-shape variables, the mean and standard deviation of the subjet multiplicity distribution and the fragmentation function for charged particles. The data are compared with predictions of perturbative QCD as well as QCD-based Monte Carlo models. In certain kinematic regions the measurements are sensitive mainly to perturbatively calculable effects, allowing for a test of QCD. The comparisons are also extended into regions where nonperturbative effects become large, and in this way the transition from hard to soft QCD is investigated. It is found that by including leading and next-to-leading logarithmic contributions in the QCD predictions, the agreement with the data can be extended to lower transverse momentum scales, especially for gluon jets.
AB - An experimental investigation of the structure of identified quark and gluon jets is presented. Observables related to both the global and internal structure of jets are measured; this allows for tests of QCD over a wide range of transverse momentum scales. The observables include distributions of jet-shape variables, the mean and standard deviation of the subjet multiplicity distribution and the fragmentation function for charged particles. The data are compared with predictions of perturbative QCD as well as QCD-based Monte Carlo models. In certain kinematic regions the measurements are sensitive mainly to perturbatively calculable effects, allowing for a test of QCD. The comparisons are also extended into regions where nonperturbative effects become large, and in this way the transition from hard to soft QCD is investigated. It is found that by including leading and next-to-leading logarithmic contributions in the QCD predictions, the agreement with the data can be extended to lower transverse momentum scales, especially for gluon jets.
U2 - 10.1007/s100520000474
DO - 10.1007/s100520000474
M3 - Journal article
VL - 17
SP - 1
EP - 18
JO - European Physical Journal C: Particles and Fields
JF - European Physical Journal C: Particles and Fields
SN - 1434-6044
IS - 1
ER -