HEPData Search

Direct photon production in hadronic events from e+e− annihilation has been studied at s=29 GeV with use of the MAC detector at the PEP storage ring. A charge asymmetry A=(−12.3±3.5)% is observed in the final-state jets. The cross section and the charge asymmetry are in good agreement with the predictions of the fractionally charged quark-parton model. Both the charge asymmetry and total yield have been used to determine values of quark charges. Limits have been established for anomalous sources of direct photons.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

rivet Analysis
K*0 AND K0(S) MESON PRODUCTION IN e+ e- ANNIHILATIONS AT 29-GeV

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Badtke, D.H. ; et al.

Phys.Rev.Lett. 53 (1984) 2378, 1984.

Inspire Record 205869 DOI 10.17182/hepdata.20408

The inclusive production cross sections and transverse momentum distributions of K*0 and KS0 mesons in e+e− annihilation at a center-of-mass energy of 29 GeV have been measured by means of the time projection chamber detector in the PEP-4 experiment. The mean multiplicites are found to be 0.49 ± 0.04(stat.) ± 0.07(syst.) (K*0+K―*0) and 1.22 ± 0.03(stat.) ±0.15(syst.) (K0+K―0) per event.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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EVIDENCE FOR THE F* MESON

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Badtke, D.H. ; et al.

Phys.Rev.Lett. 53 (1984) 2465, 1984.

Inspire Record 203890 DOI 10.17182/hepdata.20409

Evidence for a narrow state decaying into an F meson and a photon has been obtained in e+e− annihilation events at 29-GeV c.m. energy. This state lies 139.5 ± 8.3(stat.) ± 9.7(syst.) MeV above the F-meson mass and is consistent with the expected F* meson. The F mesons are identified by a peak in the K+K−Kπ± mass at 1.948±0.028±0.010 GeV.

2 data tables

Table 1

DATA REQUESTED FROM AUTHORS.

Table 2

IN (K+K-PI+) THE AUTHORS INCLUDE OTHER DECAY MODES SUCH AS (AK*0 K+),(PHI PI+),(K+ K- PI+,PI0),(K+ K- MU+ NU) WHICH CANNOT BE RESOLVED.

A Measurement of $\bar{p} p$ and $p p$ Elastic Scattering at {ISR} Energies

The AMES-BOLOGNA-CERN-DORTMUND-HEIDELBERG-WARSAW collaboration Breakstone, A. ; Campanini, R. ; Crawley, H.B. ; et al.

Nucl.Phys.B 248 (1984) 253-260, 1984.

Inspire Record 204422 DOI 10.17182/hepdata.33837

We have measured the differential cross section for pp and p̄p elastic scattering at √ s = 31, 53 and 62 GeV in the interval 0.05 < | t | < 0.85 GeV 2 at the CERN ISR using the Split Field Magnet detector. At 53 and 62 GeV, for 0.17 < | t | < 0.85 GeV 2 both pp and p̄p data show simple exponential behaviour in t ; at √ s = 31 GeV the data for 0.05 < | t | < 0.85 GeV 2 are consistent with a change in slope near | t | = 0.15 GeV 2 .

5 data tables

Table 1

ERRORS CONTAIN BOTH STATISTICAL AND T-DEPENDENT SYSYEMATIC ERRORS.

Table 2

No description provided.

Table 3

LOCAL SLOPE PARAMETERS BASED ON QUADRATIC EXPONENTIAL FIT.

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Observation of Xi- Production in $p \bar{p}$ Interactions at 540-{GeV} {CMS} Energy

The UA5 collaboration Alner, G.J. ; Alpgard, K. ; Anderer, P. ; et al.

Phys.Lett.B 151 (1985) 309-314, 1985.

Inspire Record 204764 DOI 10.17182/hepdata.30437

We have made the first observations of Ξ − production in p p interactions at √ s =540 GeV. In a sample of 6964 non single-diffractive events we observe 17 Ξ − decays with an estimated background of less than one event. This corresponds to 0.04 ± 0.01 Ξ − per event in the transverse momentum range p t >1.0 GeV/ c and in the pseudorapidity range |η| < 3.5. Assuming an exponential p t distribution, we find 〈 p t 〉=1.1 −0.2 +0.3 GeV/ c .

1 data table

Table 1

No description provided.

Photon Pair Production by $e^+ e^-$ Annihilation and Search for Supersymmetric Photinos at Energies > 40-{GeV}

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Kirschfink, F.J. ; et al.

Z.Phys.C 26 (1984) 337, 1984.

Inspire Record 204486 DOI 10.17182/hepdata.16194

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

New Results on $e^+ e^- \to \mu^+ \mu^-$ From the Jade Detector at {PETRA}

The JADE collaboration Bartel, W. ; Becker, L. ; Bowdery, C. ; et al.

Z.Phys.C 26 (1985) 507, 1985.

Inspire Record 204492 DOI 10.17182/hepdata.16141

The production of collinear muon pairs has been studied using the JADE detector at thee+e− storage ring at PETRA. Results for the total cross section and the angular distribution were obtained at centre of mass (cm) energies ranging from 12 to 46 GeV. The data correspond to an integrated luminosity offLdt>90 pb−1, of which 71.2 pb−1 were taken at$\left\langle {\sqrt s } \right\rangle $=34.4 GeV and 17 pb−1 at$\left\langle {\sqrt s } \right\rangle $=42.4 GeV. The results are compared to electroweak theories, in particular the “Standard Model”.

6 data tables

Table 1

QED comparison is to point like cross section.

Table 2

Angular distributions - data requested from authors.

Table 3

Forward-backward asymmetry calculated from a fit to the angular distribution of the form 1: + cos(theta)**2 + Bcos(theta).. Asymmetries quoted here are extrapolated to full solid angle. The asymmetry at sqrt(s) = 34.4 is -11.10 +- 1.75 +- 1.0 pct if the end-cap points are included.

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rivet Analysis
$\Lambda$ Production in $e^+ e^-$ Annihilation at 29-{GeV}

de la Vaissiere, C. ; Luth, V. ; Abrams, G.S. ; et al.

Phys.Rev.Lett. 54 (1985) 2071-2074, 1985.

Inspire Record 209198 DOI 10.17182/hepdata.20378

The production of Λ hyperons in e+e− annihilation has been measured as a function of their total momenta, transverse momenta, and the event thrust. The total production rate is 0.213±0.012±0.018 Λ or Λ¯ per hadronic event. The observation of correlations in rapidity and angles for events with two detected Λ decays supports fragmentation models with local baryon-number compensation.

3 data tables

Table 1

No description provided.

Table 2

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Table 3

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Date

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Observables

CM Energies (GeV)

Authors Reset

ANGULAR AND ENERGY CHARACTERISTICS OF SECONDARY CHARGED PARTICLES FROM ANTI-PROTON PROTON INTERACTIONS AT 22.4-GEV/C MOMENTUM

BEHAVIOR OF pi- MESON PRODUCTION INVARIANT DIFFERENTIAL CROSS-SECTIONS IN NUCLEAR INTERACTIONS AT 4.2-GeV/c PER NUCLEON

Direct Photon Production in $e^+ e^-$ Annihilation

rivet Analysis
K*0 AND K0(S) MESON PRODUCTION IN e+ e- ANNIHILATIONS AT 29-GeV

EVIDENCE FOR THE F* MESON

A Measurement of $\bar{p} p$ and $p p$ Elastic Scattering at {ISR} Energies

Observation of Xi- Production in $p \bar{p}$ Interactions at 540-{GeV} {CMS} Energy

Photon Pair Production by $e^+ e^-$ Annihilation and Search for Supersymmetric Photinos at Energies > 40-{GeV}

New Results on $e^+ e^- \to \mu^+ \mu^-$ From the Jade Detector at {PETRA}

rivet Analysis
$\Lambda$ Production in $e^+ e^-$ Annihilation at 29-{GeV}