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The $\Lambda(c$)+ Baryon Production in Interactions of 40-{GeV} to 70-{GeV} Neutrons With Carbon Nuclei

The Dubna-Berlin-Budapest-Moscow-Prague-Sofiya-Tbilisi collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.

Z.Phys.C 23 (1984) 333, 1984.

Inspire Record 196745 DOI 10.17182/hepdata.16228

The inclusive production of charmed baryonsΛc+ by 40–70 GeV neutrons on carbon has been observed. The decays$\Lambda _c^ + \to \bar K^0 p\pi ^ + \pi ^ -$ (130 ± 18 events) andΛc+→Λ0π+π+π− (57±14 events) have been detected. The mean value ofΛc+ mass is (2,268±6) MeV/c2. The invariant cross section forX>0.5 is described byE·d3σ/dp3∝ exp(−)bPT·(1−X)n withb=(2.5±0.6) (GeV/c)−1 andn=(1.5±0.5).

2 data tables

Table 1

Table 2

A Spin Parity Analysis of the $\omega \pi^0$ Enhancement Photoproduced in the Energy Range 20-{GeV} to 70-{GeV}

The Omega Photon collaboration Atkinson, M. ; Axon, T.J. ; Barberis, D. ; et al.

Nucl.Phys.B 243 (1984) 1-28, 1984.

Inspire Record 195216 DOI 10.17182/hepdata.33872

A study is made of the ωπ 0 system produced near threshold in the reaction γ p→ π + π − π 0 π 0 p. A spin-parity analysis shows that the ωπ 0 enhancement is consistent with predominant 1 + B(1235) production, with ∼20% J P = 1 − background.

2 data tables

Table 1

MEAN BEAM ENERGY IS 39 GEV.

Table 2

ESTIMATE OF B(1235) PRODUCTION CROSS SECTION ASSUMING 1+ CROSS SECTION OF 0.63 +- 0.20 MUB AND THAT 20 PCT OF THIS IS DUE TO BACKGROUND S-WAVE CONTRIBUTIONS.

Observation of a Peak at 1.28-{GeV} in the $\eta \pi \pi$ System in the Reaction $\gamma p \to \eta \pi^+ \pi^- p$

The Omega Photon collaboration Atkinson, M. ; Axon, T.J. ; Barberis, D. ; et al.

Nucl.Phys.B 242 (1984) 269-281, 1984.

Inspire Record 194474 DOI 10.17182/hepdata.33873

A peak is reported in the ηπ + π − system, produced in the reaction γ p→ ηπ + π − p, at a mass of 1.28 ± 0.01 GeV with a width of 0.08 ± 0.02 GeV. Possible spin-parity assignments for the peak are shown to be J π = 1 − , J π = 1 + or J π = 2 + and interpretations of these assignments are discussed.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

A Search for Supersymmetric Electrons

Gladney, Larry D. ; Hollebeek, R.J. ; LeClaire, B. ; et al.

Phys.Rev.Lett. 51 (1983) 2253, 1983.

Inspire Record 192285 DOI 10.17182/hepdata.20505

A search for single electrons from the decay of singly produced scalar electrons has been made at the PEP storage ring at SLAC. No events of this type have been found in 123 pb−1 of data, resulting in a cross-section limit of less than 2.4×10−2 pb within the detector acceptance, and a 95%-confidence-level lower limit on the scalar-electron mass of 22.2 GeV/c2.

1 data table

Table 1

No description provided.

Inclusive Photoproduction of Neutral Strange Particles at 20-{GeV}

The SLAC Hybrid Facility Photon collaboration Abe, K. ; Bacon, T.C. ; Ballam, Joseph ; et al.

Phys.Rev.D 29 (1984) 1877, 1984.

Inspire Record 190724 DOI 10.17182/hepdata.23774

We have studied inclusive production of KS0, Λ, and Λ¯ particles in 20-GeV γp interactions and have found features similar to those observed in both hadronic and leptonic interactions. The production cross sections, charged-particle multiplicities, and average Λ polarization are reported. Inclusive distributions of x and pT are shown and discussed in terms of quark fragmentation models. Production cross sections for K*(890) and Σ*(1385) are also reported.

9 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Search for New S Anti-s States in the $K^-$ Induced $K^+ K^-$ System

Armstrong, T. ; Baubillier, M. ; Beusch, W. ; et al.

Nucl.Phys.B 224 (1983) 193-217, 1983.

Inspire Record 190033 DOI 10.17182/hepdata.33934

Results from the first PWA of the K + K − system produced by incident K − , are presented in the mass range from the threshold to 1.70 GeV. In the P and D waves only the φ and f′ mesons are observed and their production mechanism studied. A broad S wave peaking at 1.4 GeV is observed but the lack of information about its phase makes the search for new 0 ++ mesons inconclusive.

4 data tables

Table 1

ASSUMING BRANCHING RATIO 0.486 FOR PHI --> K+ K-.

Table 2

No description provided.

Table 3

No description provided.

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CHARM PHOTOPRODUCTION CROSS-SECTION AT 20-GeV

Abe, K. ; Bacon, T.C. ; Ballam, Joseph ; et al.

Phys.Rev.Lett. 51 (1983) 156, 1983.

Inspire Record 189662 DOI 10.17182/hepdata.20508

Forty-seven charm events have been observed in an exposure of the SLAC Hybrid Facility bubble chamber to a 20-GeV backward-scattered laser beam. Thirty-seven events survive all the necessary cuts imposed. Based on this number the total charm cross section is calculated to be 63−28+33 nb.

1 data table

Table 1

No description provided.

A PARTIAL WAVE ANALYSIS OF THE F' REGION IN THE REACTION K- P ---> K ANTI-K LAMBDA0 AT 8.25-GeV/c

The BIRMINGHAM-CERN-GLASGOW-MICHIGAN STATE-PARIS collaboration Baubillier, M. ; Bloodworth, I.J. ; Burns, A. ; et al.

Z.Phys.C 17 (1983) 309-317, 1983.

Inspire Record 193023 DOI 10.17182/hepdata.16367

A partial wave analysis of theK$\bar K$ system produced by 8.25 GeV/cK− mesons in the reaction$K^ -p \to K\bar K\Lambda ^{ 0} $ has been performed, taking into account the information provided by the Λ0 decay. Thef′ region is dominated byD0(−) andD1(+) waves. We see no evidence for the production of new 0++ states in the mass region 1.05 to 1.75 GeV.

1 data table

Table 1

No description provided.