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$D$ Meson Production in $e^+ e^-$ Annihilation at Ecm Between 3.8-{GeV} and 6.7-{GeV}

Coles, M.W. ; Abrams, G.S. ; Blocker, C.A. ; et al.
Phys.Rev.D 26 (1982) 2190, 1982.
Inspire Record 178099 DOI 10.17182/hepdata.23943

The Mark II detector at SPEAR has been used to study D-meson production in e+e− annihilation at center-of-mass energies between 3.8 and 6.7 GeV. The neutral and charged D mesons are identified from their K∓π± and K∓π±π± decay modes. Measurements of RD and of the inclusive differential cross section s dσdz are presented. The quasi-two-body cross sections σDD¯, σD*D¯, and σD*D¯* are derived from an overall fit to the D recoil spectra. No evidence was found for the associated production of charmed mesons and charmed baryons.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

THE DIFFERENTIAL SCALING CROSS SECTION FOR NEUTRAL AND CHARGED D'S. DEFINITION OF Z IS 2*E(P=3)/SQRT(S).

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Study of $p p$ Interactions in the Momentum Range 0.9-{GeV}/$c$ to 2.0-{GeV}/$c$

Shimizu, F. ; Koiso, H. ; Kubota, Y. ; et al.
Nucl.Phys.A 389 (1982) 445-456, 1982.
Inspire Record 12089 DOI 10.17182/hepdata.37051

pp interactions at 11 momenta in the range 0.9 to 2.0 GeV/ c have been studied. The elastic angular distributions, covering the c.m. angular range 22°–90°, agree in general with Hoshizaki's phase-shift analysis which shows the looping 1 D in and 3 F 3 amplitudes in the Argand diagram. About 80% of pn π + events come from the n Δ ++ state at all momenta above 1.2 GeV/ c . The behavior of the density matrix elements of the Δ ++ show no momentum or angular dependence. A large fraction of pp π 0 events also come from the p Δ + state at all momenta above 1.2 GeV/ c . The behavior of the Δ + density matrix elements is similar to that for the case of Δ ++ .

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Measurements of Spin Parameters in $p p$ Elastic Scattering at 6-{GeV}/$c$

Linn, S.L. ; Perlmutter, A. ; Crosbie, E.A. ; et al.
Phys.Rev.D 26 (1982) 550, 1982.
Inspire Record 11848 DOI 10.17182/hepdata.23900

We measured the differential cross section for proton-proton elastic scattering at 6 GeV/c, with both initial spins oriented normal to the scattering plane. The analyzing power A shows significant structure with a large broad peak reaching about 24% near P⊥2=1.6 (GeV/c)2. The spin-spin correlation parameter Ann exhibits more dramatic structure, with a small but very sharp peak rising rapidly to about 13% at 90°c.m.. This sharp peak may be caused by particle-identity effects.

1 data table
Table 1

No description provided.


Measurement of the $p p$ Cross-sections in the Momentum Range 0.9-2.0 GeV/c

Shimizu, F. ; Kubota, Y. ; Koiso, H. ; et al.
Nucl.Phys.A 386 (1982) 571-588, 1982.
Inspire Record 11839 DOI 10.17182/hepdata.37042

The pp total, elastic, and all the inelastic cross sections were measured at 11 momenta in the range 0.9–2.0 GeV/c. No clear structure was observed in their momentum dependences. The momentum dependence of the total cross section agrees quite well with the result of a phase-shift analysis by Arndt. Our measurement of the ppπ 0 and pnπ + cross sections served to normalize the earlier systematic but relative and extrapolated measurements of these cross sections over a narrower momentum range. Calculations by König and Kroll based on a pion exchange model including the effect of an I = 1 dibaryon did not fit the single-pion production cross sections.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Observation of Semileptonic Decays of Charmed Baryons

Vella, E. ; Trilling, G. ; Abrams, G.S. ; et al.
Phys.Rev.Lett. 48 (1982) 1515, 1982.
Inspire Record 176986 DOI 10.17182/hepdata.19674

Direct electrons are observed in baryon events produced in e+e− annihilation at center-of-mass energies above the ΛcΛ¯c threshold. These events are attributed to charmed-baryon pair production and subsequent Λc semileptonic decay. Various semileptonic branching ratios of the Λc are determined, including B(Λc→e+X)=(4.5±1.7)%.

2 data tables
Table 1

ELECTRON-BARYON RATIO ABOVE AND BELOW LAMBDA/C THRESHOLD.

Table 2

No description provided.


Measurement of the Neutral Current to Charged Current Ratio for Anti-neutrinos Proton Inclusive Scattering

Carmony, D.D. ; Carman, T.S. ; Barnes, V.E. ; et al.
Phys.Rev.D 26 (1982) 2965, 1982.
Inspire Record 11799 DOI 10.17182/hepdata.23944

The Fermilab wide-band antineutrino beam incident on the hydrogen-filled 15-foot bubble chamber was used to study ν¯p neutral-current interactions. The u=x(1−y) distribution is presented for both the neutral- and the charged-current data sample. Fitting the neutral-current u distribution to the prediction of a simple quark-parton model measures the Weinberg angle. By using recent measurements of the neutral-to-charged-current cross-section ratio for νp interactions (Rp), we find the corresponding ratio for ν¯p interactions (R¯p) to be 0.36±0.06.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Total Cross-sections for Muon-neutrino $N$ and Muon-neutrino $P$ Charged Current Interactions in the 7-ft Bubble Chamber

Baker, N.J. ; Connolly, P.L. ; Kahn, S.A. ; et al.
Phys.Rev.D 25 (1982) 617-623, 1982.
Inspire Record 177607 DOI 10.17182/hepdata.23972

The total cross sections for νμn and νμp charged-current interactions and their ratio R=σT(νn)σT(νp) have been measured as a function of neutrino energy from 0.4 to 10 GeV. The experiment is performed using the BNL 7-foot deuterium bubble chamber exposed to the Alternating Gradient Synchrotron wide-band neutrino beam. The absolute values of the cross sections are normalized to the quasielastic scattering (νμn→μ−p) cross section. Above 1.6 GeV the data are consistent with the quark-parton model. We find that σT(νn)Eν=(1.07±0.05)×10−38, σT(νp)Eν=(0.54±0.04)×10−38, and σT(νN)Eν=(0.80±0.03)×10−38 cm2/GeV for 〈Eν〉=3.2 GeV, and R=1.95±0.10 for 〈Eν〉=3.7 GeV.

5 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERROR NOT GIVENNEUTRAL CURRENT AND NEUTRAL PARTICLES INDUCED REACTIONS, RESCATTERING IN DEUTERIUM).

Table 2

No description provided.

Table 3

No description provided.

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Study of the Reactions $e^+ e^- \to \rho \eta$, $\rho \pi$, $\phi \pi$ and $\phi \eta$ for Total Energy Ranges Between 1.4-{GeV} and 2.18-{GeV}

Delcourt, B. ; Bisello, D. ; Bizot, J.C. ; et al.
Phys.Lett.B 113 (1982) 93, 1982.
Inspire Record 176802 DOI 10.17182/hepdata.30917

The reactions e + e − → ρη , ρπ , φπ and φη have been studied with the magnetic detector DM1 at DCI in the total energy ranges between 1.4 and 2.18 GeV. The ρη signal is clearly seen. Upper limits for ρπ and φη channels as well as for the OZI forbidden φπ channel.

4 data tables
Table 1

No description provided.

Table 2

UPPER LIMIT TO SIG AS EXPLAINED IN SYSTEMATICS.

Table 3

UPPER LIMIT TO CROSS SECTION AT CL=90 PCT.

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A PARTIAL WAVE ANALYSIS OF THE K PI PI SYSTEM PRODUCED IN THE REACTION K- P ---> ANTI-K0 PI+ PI- N AT 8.25-GeV/c

The BIRMINGHAM-CERN-GLASGOW-MICHIGAN STATE-PARIS collaboration Baubillier, M. ; Bloodworth, I.J. ; Burns, A. ; et al.
Nucl.Phys.B 202 (1982) 21-42, 1982.
Inspire Record 182033 DOI 10.17182/hepdata.34133

A partial-wave analysis of the K 0 π + π − system from the reaction K − p → K 0 π + π − n has been carried out using data obtained at 8.25 GeV/ c in a high-statistics experiment. A strong signal appears in the 1 + SO + (K ∗ π) wave at the Q 2 mass (≈ 1.4 GeV). The 1 + S0 + (ϱK) wave behaves rather like a background and does not exhibit the characteristics of a resonance. A prominent signal also appears in the 2 + D wave (via K ∗ π and ϱK); it is interpreted as the K ∗ (1430). In the L region (1.6–2.1) GeV, there is evidence for the 3 − K ∗ (1780) while the 2 − wave also gives some contribution.

2 data tables
Table 1

FULLY CORRECTED CROSS SECTION.

Table 2

RESONANCE FITS CROSS SECTIONS USING BREIT WIGNER FUNCTION. NOTE THAT FOR THE K*(1780) THE CROSS SECTION DETERMINATION IS STRONGLY DEPENDENT ON THE BACKGROUND ASSUMED WHICH HAS BEEN ONLY SUBTRACTED AT 8.25 GEV.


BACKWARD ELASTIC SCATTERING AND RHO- PRODUCTION IN PI- P COLLISIONS AT 10-GEV/C

The BARI-BONN-CERN-GLASGOW-LIVERPOOL-MILAN-VIENNA collaboration Ghidini, B. ; Lenti, V. ; Palano, A. ; et al.
Nucl.Phys.B 195 (1982) 12-28, 1982.
Inspire Record 177922 DOI 10.17182/hepdata.26084

The reactions π − p → p π − and π − p → p ϱ − ( ϱ − → π − π 0 ) at 10 GeV/ c with the proton in the forward direction in the c.m.s. are discussed on the basis of 953 elastic scattering events and 2240 events of the reaction π − p → p π − π 0 . The total backward cross sections are 0.52±0.10 and 1.52±0.28 μ b, respectively. In both cases the production mechanism is compatible with the dominance of the baryonic Δ δ Regge trajectory exchange. The ϱ − decay angular distributions are studied in the u -channel helicity frame and the spin density matrix elements are presented as functions of u .

5 data tables
Table 1

No description provided.

Table 2

DATA FROM PRIV COMM WITH B. GHIDINI.

Table 3

DATA FROM PRIV COMM WITH B. GHIDINI.

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