Showing papers by "Hermann Kolanoski published in 1985"
TL;DR: In this paper, the shape of the K0 and Λ differential cross sections are very similar to each other and to those of π±,K± and\(p(\bar p)\). Scaling violations are observed for K0 production.
Abstract: Results onK0 and Λ production ine+e− annihilation at c.m. energies of 14, 22 and 34 GeV are presented. The shape of theK0 and Λ differential cross sections are very similar to each other and to those of π±,K± and\(p(\bar p)\). Scaling violations are observed forK0 production. We obtain a value for the probability to produce strange quark-antiquark pairs relative to that to produce up or down quark-antiquark pairs of 0.35±0.02±0.05. The value ofRh=σ(e+e-→hX)/σµµ is shown to rise steadily with c.m. energy for all particle species. At 34 GeV we find 1.48±0.05K0 and 0.31±0.03 Λ per event. We have searched for possible Λ polarization. The production ofK0's and Λ's in jets is examined as a function ofpT2 and rapidity and compared to that of all charged particles; the yields in two and three jets are also investigated. Results are presented from events with two baryons\((\Lambda ,\bar \Lambda ,por\bar p)\) observed.
40 citations
TL;DR: In this article, the authors observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV, consistent with QED.
Abstract: We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ
+>161 GeV andΛ
−169 GeV (95% CL). The topological branching fraction of the τ to 1 charged particle,B
1, is 0.847±0.011 (stat)
−0.013
+0.016
(syst) and no decays to 5 charged particles were observed resulting inB
5<0.007 (95% CL). Within the 3 charged track final stateB(τ
−→π
−
π
+
π
−
v)/(B(τ
−→π
−
π
+
π
−
v)+B(τ
−→π
−
π
+
π
−
π
0
v))=0.37
−0.20
+0.35
33 citations
RWTH Aachen University1, University of Bonn2, University of Bristol3, University of Hamburg4, Imperial College London5, Autonomous University of Madrid6, University of Oxford7, Queen Mary University of London8, Rutherford Appleton Laboratory9, Weizmann Institute of Science10, University of Wisconsin-Madison11
TL;DR: In this article, an analysis of the production ofKS0KS0 and Ks0π∓ by two quasi-real photons is presented, and upper limits on the product of the two-photon width times the branching ratio into K\(\bar K\) pairs are given forΘ(1700),h(2030), and ξ(2220).
Abstract: An analysis of the production ofKS0KS0 andK±Ks0π∓ by two quasi-real photons is presented. The cross section forγγ→K0\(\overline {K^0 } \), which is given for the γγ invariant mass range fromK\(\bar K\) threshold to 2.5 GeV, is dominated by thef′(1525) resonance and an enhancement near theK\(\bar K\) threshold. Upper limits on the product of the two-photon width times the branching ratio intoK\(\bar K\) pairs are given forΘ(1700),h(2030), and ξ(2220). For exclusive two-photon production ofK±Ks0π∓ no significant signal was observed. Upper limits are given on the cross section ofγγ→K+\(\overline {K^0 } \)π− orK−K0π+ between 1.4 and 3.2 GeV and on the product of the γγ width times the branching ratio into theK\(\bar K\)π final states for theηc(2980) and the ι(1440), yieldingΓ(γγ)→i(1440))·BR(i(1440)→K\(\bar K\)π<2.2 keV at 95% C.L.
29 citations
RWTH Aachen University1, University of Bonn2, University of Bristol3, University of Hamburg4, Imperial College London5, Autonomous University of Madrid6, University of Oxford7, Queen Mary University of London8, Rutherford Appleton Laboratory9, Weizmann Institute of Science10, University of Wisconsin-Madison11
TL;DR: In this paper, the authors studied the correlations between charged particles produced by annihilations into hadrons at cm energies between 29 and 37 GeV and found evidence for correlations between the multiplicities of the two jets.
Abstract: We have studied the correlations between charged particles produced ine
+
e
− annihilations into hadrons at cm energies between 29 and 37 GeV We have analysed the correlations between the charged multiplicities of the jets and the two particle rapidity and charge correlations No evidence for correlations between the multiplicities of the two jets is found Two particle short range rapidity and charge correlations are observed, indicating that particles cluster in rapidity and that their charges compensate locally An extensive study of these correlation effects by QCD Monte Carlo calculations was performed Evidence for charge correlations due to Bose-Einstein statistics is also observed
27 citations
RWTH Aachen University1, University of Bonn2, University of Bristol3, University of Hamburg4, Imperial College London5, Autonomous University of Madrid6, University of Oxford7, Queen Mary University of London8, Rutherford Appleton Laboratory9, Weizmann Institute of Science10, University of Wisconsin-Madison11
TL;DR: In this article, three-jet events produced bye+e− annihilation into hadrons at 34.6 GeV c.m. energy were studied by comparing them with 2nd order QCD and two different models of fragmentation.
Abstract: Three-jet events produced bye+e− annihilation into hadrons at 34.6 GeV c.m. energy were studied by comparing them with 2nd order QCD and two different models of fragmentation. The distribution of low energy particles in the 3-jet plane is found to be better described by the LUND color string model than by the independent jet model. The opposite is true for more energetic particles flowing between the 3 jets. The average transverse momenta in jets can be described with values of σq between 350 and 500 MeV/c for the gluon jet.
26 citations
TL;DR: In this article, the authors measured the cross sections for e−e− → e+e−, e+ e− → μ+μ−, E−e − → γγ, E − e− − → hadrons in an energy scan at center of mass energies between 39.79 and 46.72 GeV in 30 MeV steps.
9 citations