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Charged Charm Production in Proton - Emulsion Interactions at 400-{GeV}/$c$

The Aligarh-Bombay-Chandigarh-Jammu-Varanasi collaboration Aziz, T. ; Ahmad, S. ; Ahrar, H. ; et al.

Z.Phys.C 27 (1985) 325, 1985.

Inspire Record 206837 DOI 10.17182/hepdata.18517

A study of charged charm production is made at 400 GeV incident energy of protons in nuclear emulsion. A total of 7005 primary stars have been scrutinized to look for charm particle decays in the forward cone within a decay distance of 100–1,000 μm (3,056 stars) and 100–2,000 μm (3,949 stars). In all 10 charm candidates decaying to 3 charged particles plus neutrals have been observed. Background due to secondary interactions for events of such topology is estimated to be ≈3. Background due to strange particle decays is estimated to be negligible. The rest of the events are attributed toΛc+ andD± decays. This leads to a value of 91±35 μb/nucleon for the total charged charm production cross section. Using production cross section forD± from other experiments we obtainΛc+ production cross section as 62±27 μb/nucleon. Two cases of pair production of charm have been seen.

2 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (NOT GIVENDECAY-BR(BRN=D+ --> 3CHARGED (NEUTRALS), BR=0.5)//DECAY-BR(BRN=D- --> 3CHARGED (NEUTRALS), BR=0.5)//DECAY-BR(BRN=LAMBDA/C+ --> 3CHARGED (NEUTRALS), BR=0.6)).

Table 2

Inclusive $K^0_S$, $\Lambda$ and $\bar{\Lambda}$ Production in 360-{GeV}/$c p p$ Interactions Using the European Hybrid Spectrometer

The EHS-RCBC & Bombay-CERN-Genoa-Innsbruck-Japan-Madrid-Mons-Rutgers-Serpukhov-Tennessee-Vienna collaborations Asai, M. ; Bailly, J.L. ; Banerjee, S. ; et al.

Z.Phys.C 27 (1985) 11, 1985.

Inspire Record 202938 DOI 10.17182/hepdata.16100

Results on cross sections, longitudinal and transverse momentum distributions forKs/0, Λ and$\bar \Lambda $ production in 360GeV/cpp interactions are presented as obtained from EHS equipped with the Rapid Cycling Bubble Chamber (RCBC). The Λ and$\bar \Lambda $ polarizations are measured. The cross section for the diffractive components is given using the recoil spectrum. The data are discussed with respect to charm production.

1 data table

Table 1

No description provided.

The $Q^2$ and Transverse Momentum Dependence of Jet Production in Photon-photon Interactions

The PLUTO collaboration Berger, Christoph ; Deuter, A. ; Genzel, H. ; et al.

Z.Phys.C 26 (1984) 191, 1984.

Inspire Record 203794 DOI 10.17182/hepdata.16196

We present an experimental study of jetproduction in photon-photon interactions for 0.1≲Q2≲120 GeV2 and jet transverse momentum,pT, up to 5 GeV/c. At alQ2, the data show a highpT, tail, characteristic of a point-like interaction. The jet production cross-section approaches the quarkparton model (QPM) expectation as either jetpT orQ2 increases. Overall, the data are well described in both total cross-section and event topology by the sum of a vector-dominance model and a point-like interaction, represented by the QPM.

1 data table

Table 1

No description provided.

Upper Limits on the Production Rate of the Decuplet Baryons $\Delta$ and $\Sigma^*$ in $e^+ e^-$ Annihilation at 34.4-{GeV}

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

Z.Phys.C 26 (1984) 181, 1984.

Inspire Record 203142 DOI 10.17182/hepdata.16197

2 data tables

Table 1

UPPER LIMITS FOR DEL(1232)++ PRODUCTION.

Table 2

UPPER LIMITS FOR SIG(1385)+- PRODUCTION.

NEW RESULTS ON THE HADRONIC AND SEMILEPTONIC DECAYS OF CHARMED D MESONS MEASURED IN e+ e- COLLISIONS

The MARK-III collaboration Schindler, Rafe H. ;

I.171, 1984.

Inspire Record 205049 DOI 10.17182/hepdata.28305

4 data tables

Table 1

HADRONIC DECAY CROSS SECTIONS.

Table 2

HADRONIC DECAY CROSS SECTIONS.

Table 3

No description provided.

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rivet Analysis
Measurements of Energy Correlations in $e^+ e^- \to$ Hadrons

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

Z.Phys.C 25 (1984) 231, 1984.

Inspire Record 202784 DOI 10.17182/hepdata.1998

Energy-energy-correlations (EEC) have been measured with the JADE detector at c.m. energies of 14 GeV, 22 GeV and in the region 29 GeV<Ecm<36 GeV. Corrected results are presented of EEC and their asymmetry, which can be directly compared to theoretical predictions. At 〈Ecm〉=34 GeV a comparison with second order QCD predictions yields good agreement for the string model fragmentation resulting in a value of the strong coupling constant αs=0.165±0.01 (stat.). The independent fragmentation models, which yield values of αs between 0.10 and 0.15 depending on the treatment of energy and momentum conservation and of the gluon splitting, do not provide a satisfactory description of the data over the full angular range.

3 data tables

Table 1

TABLES GIVEN HERE CONTAIN SELF CORRELATION. THIS IS SUBTRACTED IN THE FIGURE.

Table 2

VALUE OF ASSYMETRY IN CORRELATIONS.

Table 3

No description provided.

MOMENTUM AND ANGULAR DISTRIBUTIONS OF CHARGED SECONDARIES IN 40-GeV/c pi- A INTERACTIONS WITH SINGLE PARTICLE HIGH P(T) TRIGGER

The Berlin-Budapest-Dubna-Prague-Sofiya-Tbilisi-Warsaw collaboration Adam, G. ; Bannikov, A.V. ; Bohm, J. ; et al.

JINR-E1-84-442, 1984.

Inspire Record 203314 DOI 10.17182/hepdata.9861

None

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Pion Pair Production From $\gamma \gamma$ Interactions at {PEP} and the Radiative Width of the F0 Meson

The DELCO collaboration Courau, A. ; Johnson, R.P. ; Sherman, S.S. ; et al.

Phys.Lett.B 147 (1984) 227-231, 1984.

Inspire Record 202552 DOI 10.17182/hepdata.30498

Results are presented of an untagged e + e − → e + e − + π + π − experiment performed at PEP with the DELCO detector. In the invariant-mass range 0.7 ⩽ W ππ < 2.0 GeV/ c 2 , the QED e + e − background is identified and eliminated, and both the π + π − predictions and the μ + μ − and K + K − background substractions are normalized to the measurement of the e e + e − events. The results agree with a simple model of superposition and interference of the f 0 (1270) resonance, produced with helicity 2, with a Born-term continuum. From a fit of the model to the data, the radiative width of the f 0 is determined to be Γ f 0 → γγ = 2.70 ± 0.21 keV.

1 data table

Table 1

Data read from graph.