摘要:

Theoretical predictions for glueball properties are reviewed. Large variations in the mass predictions of models are pointed out. One common prediction is that the lightest glueball is a scalar, and the consequences of the possibility that it lies below 1 GeV are explained. The anomalous production and decay properties of scalar and pseudoscalar glueballs due to the trace and axial anomalies are discussed. Various interesting possible glueball properties are scrutinized.

ISSN:0094-243X    

DOI:10.1063/1.34784

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Preliminary results from a study of 2.7 millionJ/&psgr; decays are presented. 2 Properties of the &psgr;c, including new branching ratio measurements and a determination of its spin and parity, are discussed. Measurements of two classes of two‐body mesonic decays of theJ/&psgr; are discussed: the decay of two pseudoscalars (&pgr;+&pgr;1,K+K−, andKL0KS0) and the pseudoscalar+vector decays (&rgr;r,KK±(890), &ohgr;&eegr;, &ohgr;&eegr;′, &ohgr;&pgr;0, &fgr;&eegr;, and &psgr;&eegr;′). These measurements include several previously unobserved decay modes.

ISSN:0094-243X    

DOI:10.1063/1.34781

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Results from the analysis of five radiativeJ/&psgr; decays are presented. InJ/&psgr;→&ggr;KK¯, thef′(1515), &thgr;(1720), and a new state, the &xgr;(2200), are observed in theKK¯ mass spectrum. In the double radiative decayJ/&psgr;→&ggr;X;X→&ggr;p0, evidence is presented for structure near 1.4 GeV. Finally, in the three SU(3) related decaysJ/&psgr;→&ggr;&rgr;→ &rgr;0,J/&psgr;→&ggr;&rgr;+&rgr;−, andJ/&psgr;→&ggr;&ohgr;&ohgr;, structure is observed near 1.7 GeV. Analysis of the decay angular distributions in these three modes indicates that even spin and odd parity predominate in this mass region.

ISSN:0094-243X    

DOI:10.1063/1.34793

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Recent preliminary results from PEP on photon‐photon collisions are presented. The reaction &ggr;&ggr;→&mgr;&mgr; with single tagging is compared to predictions of QED, and the leptonic structure functions of the photon (F2and 2×F1) extracted. The cross section for &ggr;&ggr;→hadrons is reported from a double‐tag measurement with &ggr;&ggr; c.m. energy (determined from the tags) between 2 and 20 GeV. New measurements off0production and an observation of &eegr; production are reported. Finally, single‐tagged measurements of exclusive 4&pgr; and KK&pgr;&pgr; states at low mass show the dependence of the former on photon mass‐squared, and provide evidence for &fgr; production.

ISSN:0094-243X    

DOI:10.1063/1.34799

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Two photon physics at PETRA are reviewed. New results on &Ggr;&ggr;&ggr;(&eegr;′),pp¯&pgr;+&pgr;−, inclusive hadron production, evidence for jets, structure functions of real and virtual photons and total cross sections are given.

ISSN:0094-243X    

DOI:10.1063/1.34800

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

We review the phenomenology of theories with broken supersymmetry, with an emphasis on howe+e−interactions can be used to search for the superpartners of the known matter and gauge particles of the Standard Model.

ISSN:0094-243X    

DOI:10.1063/1.34779

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Recent results on the search for new particles performed at PETRA are reported. No new particles have been observed. Limits on masses and/or production cross sections for various new particles are given. One unusual event has been found.

ISSN:0094-243X    

DOI:10.1063/1.34780

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The subject of this talk will be the recent searches for new particles that have been conducted at PEP. In such a context, PEP’s unique advantage is a large integrated luminosity that has been accumulated in recent years. While the center of mass energy has remained at 29 GeV, experiments can perform clean, high statistics searches to set improved limits on new particle production.

ISSN:0094-243X    

DOI:10.1063/1.34782

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The present status of our knowledge on quark mixing and its phenomenologicl implications are reviewed. Especially, the implications of the recent measurements of theblifetime and the ratio &Ggr;b+u/&Ggr;b+con the Kobayashi‐Maskawa matrix, CP violation in theKsystem &egr;, &egr;′/&egr;,t‐quark massesmt, and the CP violating effects in charm and beauty particle decays are discussed.

ISSN:0094-243X    

DOI:10.1063/1.34783

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Recent updates on the measurement of the &tgr; andD0lifetimes by the Mark II Collaboration and on measurements of the &tgr; and B−hadron lifetimes by the MAC Collaboration are presented. A new determination of an upper limit for the tau neutrino mass by the Mark II Collaboration and a recent measurement of Cabibbo‐suppressed tau decay branching ratios from the DELCO Collaboration are also presented.

ISSN:0094-243X    

DOI:10.1063/1.34785

出版商:AIP    

年代:1984

数据来源: AIP