Trower, W.P.
Strange production
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$K^- p$ total and elastic cross sections at 2.66 GeV/c

Ficenec, J.R. ; Trower, W.P. ;
Phys.Lett.B 25 (1967) 369-372, 1967.
Inspire Record 1389627 DOI 10.17182/hepdata.29435

At an incident kaon momentum of 2.66 GeV/ c we have measured the total and elastic cross sections to be 30.2 and 5.70 mb respectively. The elastic scattering angular distribution is dominated by a single diffraction peak; and when this peak is fit to an exponential in momentum transfer t , the first order term is both necessary and sufficient. This fit evaluated at t =0 is consistent with a purely imaginary forward scattering amplitude. Our data when compared with that of others indicates no shrinkage of the diffraction peak. The entire angular distribution was also fit to a Legendre series, with order 9 being required to represent the data.

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).


Measurement of the average b baryon lifetime and the product branching ratio f (b --> Lambda(b)) x BR (Lambda(b) --> Lambda lepton- anti-neutrino X)

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys.C 69 (1996) 195-214, 1996.
Inspire Record 397395 DOI 10.17182/hepdata.51966

None

1 data table
Table 1

Charged conjugate state is assumed.


rivet Analysis
The Production of neutral kaons in Z0 decays and their Bose-Einstein correlations

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys.C 67 (1995) 389-402, 1995.
Inspire Record 393503 DOI 10.17182/hepdata.48008

The production of neutral kaons in e+e− annihilation at centre-of-mass energies in the region of the Z0 mass and their Bose-Einstein correlations are investigated with the OPAL detector at LEP. A total of about 1.26×106 Z0 hadronic decay events are used in the analysis. The production rate of K0 mesons is found to be 1.99±0.01±0.04 per hadronic event, where the first error is statistical and the second systematic. Both the rate and the differential cross section for K0 production are compared to the predictions of Monte Carlo generators. This comparison indicates that the fragmentation is too soft in bothJetset andHerwig. Bose-Einstein correlations in Ks0Ks0 pairs are measured through the quantityQ, the four momentum difference of the pair. A threshold enhancement is observed in Ks0Ks0 pairs originating from a mixed sample of\(K^0 \bar K^0\) and K0K0 (\(\bar K^0 \bar K^0\)) pairs. For the strength of the effect and for the radius of the emitting source we find values of λ=1.14±0.23±0.32 andR0=(0.76±0.10±0.11) fm respectively. The first error is statistical and the second systematic.

3 data tables
Table 1

No description provided.

Table 2

The mean x is computed using the method of Lafferty and Wyatt NIM A355(1995)541.

Table 3

The mean x is computed using the method of Lafferty and Wyatt NIM A355(1995)541.


Inclusive strange vector and tensor meson production in hadronic Z0 decays

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys.C 68 (1995) 1-12, 1995.
Inspire Record 393954 DOI 10.17182/hepdata.47993

Measurements have been made in the OPAL experiment at LEP of the inclusive production of strange vector φ(1020) and K*(892)0 mesons, and the tensor meson K2*(1430)0. The overall production rates per hadronic Z0 decay have been determined to be 0.100±0.004stat.±0.007syst. φ(1020) mesons, 0.74±0.03stat.±0.03syst. K*(892)0 mesons and (forxE<0.3) 0.19±0.04stat.±0.06syst. K2*(1430)0 mesons. The measurements for the vector states update previously published results based on lower statistics, while the K2*(1430)0 rate represents the first direct measurement of a strange tensor state in Z0 decay. For the vector states, both the overall production rates and normalised differential cross sections, with respect to the scaled energy variablexE, have been compared to JETSET and HERWIG predictions. The peak positions in the ζ=ln(1/xp) distributions have been measured and compared to measurements of other hadron states.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

Extrapolated to full x region.

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Polarization of Lambda and anti-Lambda produced by 800-GeV protons

Ramberg, E.J. ; Bock, G.J. ; Coleman, R. ; et al.
Phys.Lett.B 338 (1994) 403-408, 1994.
Inspire Record 372108 DOI 10.17182/hepdata.42451

We have measured the polarization of Λ and Λ hyperons produced by 800 GeV protons on a Be target at a fixed targeting angle of 4.8 mrad. Comparison with previous data at 400 GeV production energy and twice the targeting angle shows no significant energy dependence for the Λ polarization. This is in striking contrast to the energy dependence found for σ + and Ξ − polarizations. We find no evidence for Λ polarization at 800 GeV.

2 data tables
Table 1

Errors are combined statistics and systematics.

Table 2

No description provided.


Inclusive Strange Particle Production in Single Vee Events in 200-GeV/c pi- n Interactions

Mikocki, S. ; Ficenec, J.R. ; Torres, S. ; et al.
Phys.Rev.D 34 (1986) 42, 1986.
Inspire Record 218617 DOI 10.17182/hepdata.23427

For the reaction π−N→V0X, where V0 is a Ks0, Λ, and Λ¯ and X are charged particles, we measured the transverse- and longitudinal-momentum distributions, and inclusive cross sections for the V0 and for K*±(892), Σ±(1385), and Ξ±(1321). We compare our results with predictions of quark-counting rules, and conclude that valence quarks play an important role in strange-particle production.

1 data table
Table 1

No description provided.


Diffractive Production of $K^0_s K^0_s \pi^+ \pi^- \pi^-$ in $\pi^-N$ Interactions at 200-GeV/c

Chang, C.C. ; Davis, T.C. ; Diamond, R.N. ; et al.
Phys.Rev.D 29 (1984) 1888-1894, 1984.
Inspire Record 194648 DOI 10.17182/hepdata.23730

The diffractive dissociation of a 200-GeV/c π− beam into KS0KS0π+π−π− has been observed. The diffractive KS0KS0π+π−π− cross section is 1.59±0.78 μb. The ratio of the diffractive KS0KS0π+π−π− cross section to the diffractive KS0KS0π− cross section is 0.40±0.13, which is in good agreement with a diffractive-fragmentation-model prediction of 0.36. There is evidence for simultaneous production of K*− and K*+ in the diffractive KS0KS0π+π−π− sample. The K*+−KS0π−+ mass distribution shows an enhancement near 1.95 GeV.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Resonance Production in Diffractive $\pi^- N \to K^0_s K^0_s \pi^- N^{\prime}$ at 200-GeV/c

Chen, T.Y. ; Jenkins, E.W. ; Johnson, K.J. ; et al.
Phys.Rev.D 28 (1983) 2304, 1983.
Inspire Record 182627 DOI 10.17182/hepdata.23787

The reaction π−N→KS0KS0π−N′ at 200 GeV/c has been observed with a sensitivity of 450±150 events/μb. The KS0KS0π− system exhibits substantial K*−(890)K0 production. Also produced are f0(1270)π−, f′(1515)π−, and K*−(1430)K0 final states. These resonances occur predominantly at threshold. The diffractive KS0KS0π− cross section is 3.4±1.1 μb. An enhancement near the A3−(1680) is observed in the KS0KS0π− invariant-mass distribution.

2 data tables
Table 1

No description provided.

Table 2

EVIDENCE FOR A3 MESON SEEN.


S - $P$ Wave Interference in $K^+ K^-$ Photoproduction Near $K^+ K^-$ Threshold

Fries, D.C. ; Heine, P. ; Hirschmann, H. ; et al.
Nucl.Phys.B 143 (1978) 408-416, 1978.
Inspire Record 130050 DOI 10.17182/hepdata.34981

A mass-dependent asymmetry was observed in the decay angular distribution of a photoproduced K + K − system near the K + K − threshold. The corresponding moments 〈 Y 1 0 〉 have been evaluated. Interpreting the asymmetry as an S-P wave interface due to the states S 993 ∗ (0 + ) and ø 1019 (1 − ) one can compute the moments 〈 Y 1 0 〉 through an amplitude analysis. The theoretical calculation reproduces the experimental results well, if one assumes a real S-wave amplitude for the S 993 ∗ . The data cannot be explained by a non-resonant real S-wave. Other possibilities have been discussed. An estimate of the photoproduction cross section of the S ∗ → K + K − can be given on the basis of the above hypothesis.

1 data table
Table 1

No description provided.


A study of k pi pi states produced in 10 gev/c k+ p interactions

Barnham, K.W.J. ; Colley, D.C. ; Dodd, W.P. ; et al.
Nucl.Phys.B 25 (1970) 49-74, 1971.
Inspire Record 68842 DOI 10.17182/hepdata.33832

We present an analysis of the K ππ system produced in 10 GeV/ c K + p interactions. We show that the low-mass enchancement between 1.2 and 1.4 GeV/ c 2 on the K ππ mass spectrum is predominantly 1 + throughout, give the relative amplitudes for the decay of this system into K ∗ (890) π and K ρ , and offer new evidence for the presence of two 1 + resonances in this mass region.

2 data tables
Table 1

No description provided.

Table 2

DIFFERENTIAL CROSS SECTION FOR THREE MASS BANDS IN Q-REGION. NORMALIZATION UNCERTAIN - NO UNITS FOR D(SIG)/DT GIVEN ON FIGURE. NUMERICAL VALUES TAKEN FROM THE COMPILATION LST7V2 FOX 72B. ERRORS ADDED AS 1/SQRT(EVENTS).