D. Schlatter

Variation of the strong coupling constant from a measurement of the jet energy spread in e+e− annihilation

Abstract A measurement of jet energy spread in the reaction e+e− → hadrons is presented. Using a jet calculus model for the jet development we determine the variation of the strong coupling constant with respect to momentum transfer. The observed variation is consistent with that expected for QCD over a wide range of momentum transfers. This method alone is not sufficient to distinguish QCD from simple limited transverse momentum models.

LIMITS ON J/PSI-PRODUCTION AND UPSILON-PRODUCTION IN E+E-INTERACTIONS AT SQUARE-ROOT-S=29 GEV

A search has been made for the inclusive production of Jψ (3.1) and ϒ (9.4) mesons in e+e− interactions at 29 GeV, via their decay into two leptons. No signal is observed in the Jψ region, nor in the ϒ region. The limits on the cross sections are σ(e+e− → ψX) < 4.4 × 10−36cm2, and σ(e+e− → ϒX) < 4.7 × 10−36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → l+l−X) < 0.8%.Volume 129, number 1,2 PHYSICS LETTERS 15 September 1983 LIMITS ON J / ~ A N D T PRODUCTION IN e+e - INTERACTIONS AT X/s= 29 GeV ~ C. MATTEUZZI, G.S. ABRAMS, D. AMIDEI, C.A. BLOCKER, A.M. BOYARSKI, M. BREIDENBACH, D.L. BURKE, W. CHINOWSKY, W.E. D1ETERLE 1, J.B. DILLON, J.M. DORFAN, M.W. EATON, G.J. FELDMAN, M.E.B. FRANKLIN, G. GIDAL, L. GLADNEY, M.S. GOLD, G. GOLDHABER, L.J. GOLDING, G. HANSON, R.J. HOLLEBEEK, W.R. INNES, J.A. JAROS, A.D. JOHNSON, J.A. KADYK, A.J. LANKFORD, R.R. LARSEN, B. LeCLAIRE, M. LEVI, N. LOCKYER, V. LI]TH, M.E. NELSON, J.F. PATRICK 2, M.L. PERL, B. RICHTER, P.C. ROWSON, T. SCHAAD, H. SCHELLMAN, D. SCHLATTER, R.F. SCHWITTERS, P.D. SHELDON, J. STRAIT 3, G.H. TRILLING, C. de la VAISSIERE, J.M. YELTON and C. ZAISER Stanford Linear Accelerator Center, Stanford UniversiO,, Stanford, CA 94305, USA Lawrence Berkeley Laboratory and Department o f Physies, University of California, Berkeley. CA 94720, USA Department o f Physics, Harvard University, Cambridge, MA 02138, USA Received 29 April 1983 A search has been made for the inclusive production of J/¢, (3.1) and T (9.4) mesons in e+e - interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J/O region, nor in the r region. The limits on the cross sec- tions are o (e+e - ~ ~X) 15 GeV. Very high statistics experiments are needed in order to check these calculations and to identify the differ- ent mechanisms which are involved. The perturbative calculations are however the minimal expected con- tribution to

Limits on and ϒ production in e+e− interactions at

inclusive production: a large uncer- tainty comes from possible non-perturbative contribu- tions. Some calculations [3] predict a cross section larger than 10 -1 ouu , which would imply a large prob- ability to observe

Limits on Jψ and ϒ production in e+e− interactions at s = 29 GeV

s at energies Ecru > 15 GeV. In the inclusive

Measurement of the lifetime of bottom hadrons

production e+e - -+ SX, the ~ leptonic

D*+ production in e+e- annihilation at 29 GeV

A search has been made for the inclusive production of Jψ (3.1) and ϒ (9.4) mesons in e+e− interactions at 29 GeV, via their decay into two leptons. No signal is observed in the Jψ region, nor in the ϒ region. The limits on the cross sections are σ(e+e− → ψX) < 4.4 × 10−36cm2, and σ(e+e− → ϒX) < 4.7 × 10−36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → l+l−X) < 0.8%.Volume 129, number 1,2 PHYSICS LETTERS 15 September 1983 LIMITS ON J / ~ A N D T PRODUCTION IN e+e - INTERACTIONS AT X/s= 29 GeV ~ C. MATTEUZZI, G.S. ABRAMS, D. AMIDEI, C.A. BLOCKER, A.M. BOYARSKI, M. BREIDENBACH, D.L. BURKE, W. CHINOWSKY, W.E. D1ETERLE 1, J.B. DILLON, J.M. DORFAN, M.W. EATON, G.J. FELDMAN, M.E.B. FRANKLIN, G. GIDAL, L. GLADNEY, M.S. GOLD, G. GOLDHABER, L.J. GOLDING, G. HANSON, R.J. HOLLEBEEK, W.R. INNES, J.A. JAROS, A.D. JOHNSON, J.A. KADYK, A.J. LANKFORD, R.R. LARSEN, B. LeCLAIRE, M. LEVI, N. LOCKYER, V. LI]TH, M.E. NELSON, J.F. PATRICK 2, M.L. PERL, B. RICHTER, P.C. ROWSON, T. SCHAAD, H. SCHELLMAN, D. SCHLATTER, R.F. SCHWITTERS, P.D. SHELDON, J. STRAIT 3, G.H. TRILLING, C. de la VAISSIERE, J.M. YELTON and C. ZAISER Stanford Linear Accelerator Center, Stanford UniversiO,, Stanford, CA 94305, USA Lawrence Berkeley Laboratory and Department o f Physies, University of California, Berkeley. CA 94720, USA Department o f Physics, Harvard University, Cambridge, MA 02138, USA Received 29 April 1983 A search has been made for the inclusive production of J/¢, (3.1) and T (9.4) mesons in e+e - interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J/O region, nor in the r region. The limits on the cross sec- tions are o (e+e - ~ ~X) 15 GeV. Very high statistics experiments are needed in order to check these calculations and to identify the differ- ent mechanisms which are involved. The perturbative calculations are however the minimal expected con- tribution to

Weak neutral currents in e+e- collisions at s=29 GeV

inclusive production: a large uncer- tainty comes from possible non-perturbative contribu- tions. Some calculations [3] predict a cross section larger than 10 -1 ouu , which would imply a large prob- ability to observe

Inclusive electron production in e+e- annihilation at 29 GeV

s at energies Ecru > 15 GeV. In the inclusive

Charged Multiplicity of Hadronic Events Containing Heavy Quark Jets

production e+e - -+ SX, the ~ leptonic

D*/sup +/ production in e/sup +/e/sup -/ annihilation at 29 GeV

A search has been made for the inclusive production of Jψ (3.1) and ϒ (9.4) mesons in e+e− interactions at 29 GeV, via their decay into two leptons. No signal is observed in the Jψ region, nor in the ϒ region. The limits on the cross sections are σ(e+e− → ψX) < 4.4 × 10−36cm2, and σ(e+e− → ϒX) < 4.7 × 10−36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → l+l−X) < 0.8%.Volume 129, number 1,2 PHYSICS LETTERS 15 September 1983 LIMITS ON J / ~ A N D T PRODUCTION IN e+e - INTERACTIONS AT X/s= 29 GeV ~ C. MATTEUZZI, G.S. ABRAMS, D. AMIDEI, C.A. BLOCKER, A.M. BOYARSKI, M. BREIDENBACH, D.L. BURKE, W. CHINOWSKY, W.E. D1ETERLE 1, J.B. DILLON, J.M. DORFAN, M.W. EATON, G.J. FELDMAN, M.E.B. FRANKLIN, G. GIDAL, L. GLADNEY, M.S. GOLD, G. GOLDHABER, L.J. GOLDING, G. HANSON, R.J. HOLLEBEEK, W.R. INNES, J.A. JAROS, A.D. JOHNSON, J.A. KADYK, A.J. LANKFORD, R.R. LARSEN, B. LeCLAIRE, M. LEVI, N. LOCKYER, V. LI]TH, M.E. NELSON, J.F. PATRICK 2, M.L. PERL, B. RICHTER, P.C. ROWSON, T. SCHAAD, H. SCHELLMAN, D. SCHLATTER, R.F. SCHWITTERS, P.D. SHELDON, J. STRAIT 3, G.H. TRILLING, C. de la VAISSIERE, J.M. YELTON and C. ZAISER Stanford Linear Accelerator Center, Stanford UniversiO,, Stanford, CA 94305, USA Lawrence Berkeley Laboratory and Department o f Physies, University of California, Berkeley. CA 94720, USA Department o f Physics, Harvard University, Cambridge, MA 02138, USA Received 29 April 1983 A search has been made for the inclusive production of J/¢, (3.1) and T (9.4) mesons in e+e - interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J/O region, nor in the r region. The limits on the cross sec- tions are o (e+e - ~ ~X) 15 GeV. Very high statistics experiments are needed in order to check these calculations and to identify the differ- ent mechanisms which are involved. The perturbative calculations are however the minimal expected con- tribution to