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A Study of particle ratios and strangeness suppression in p anti-p collisions at s**(1/2) = 630-GeV with UA1

Bocquet, G. ; Norton, A. ; Wang, H.Q. ; et al.
Phys.Lett.B 366 (1996) 447-450, 1996.
Inspire Record 403647 DOI 10.17182/hepdata.48043

From a sample of 2.36 million minimum bias events produced in p p collisions at s =630 GeV in the UA1 experiment and from other published data at the CERN S p p S collider we have estimated the relative production of π ± , π 0 , K ± , K S 0 , Λ, Λ , p and p . We obtain a meson over baryon ratio M B = 6.4 ± 1.1 . From the K S 0 π ± ratio we measure the strangeness suppression factor λ = 0.29 ± 0.02 ± 0.01 which, combining with other available data provides a new world average of 0.29 ± 0.015. Both the K S 0 π ± ratio and the strangeness suppression factor λ as a function of s are investigated, and an extrapolation to the LHC energy is performed.

2 data tables
Table 1

Extrapolation to pt=0.

Table 2

CONST is strangeness suppression factor, extracted from KS/PI+- ratio (see text).


Bose-Fermi U(6/2J+1) Supersymmetries And High-Spin Anomalies

Morrison, I. ; Jarvis, Peter D. ;
Nucl.Phys.A 435 (1985) 461-476, 1985.
Inspire Record 212932 DOI 10.17182/hepdata.17659

A supersymmetric extension of the interacting boson model (IBM) is constructed to describe high-spin anomalies in both even- and odd-mass spectra of the Hg, Pt region (190 ⩽ A ⩽ 200). Supergroup chains such as U ( 6 2j + 1 ) ⊃ Osp ( 6 2j + 1 ) ⊃ O (6) × Sp ( 6 2j + 1 )… U ( 6 2j + 1 ) ⊃ U ( 5 2j + 1 ) ⊃ Osp ( 5 2j + 1 )… incorporate a single j -shell fermion in addition to the usual “s” and “d” bosons ( L = 0 and L = 2). The orthosympletic supergroup reflects the strong pairing force in the subspace of the fermion intruder level. The model agrees favourably with experiment and microscopic calculation.

1 data table
Table 1

No description provided.


CROSS-SECTIONS FOR EXCLUSIVE CHANNELS IN anti-p p REACTIONS AT 12-GeV/c

The Brussels-CERN-London-Mons-Orsay collaboration Casali, R. ; Anostolakis, A. ; Caso, C. ; et al.
Z.Phys.C 11 (1982) 273, 1982.
Inspire Record 167028 DOI 10.17182/hepdata.16434

The data obtained in an exposure of BEBC to an r.f. separated beam of antiprotons at 12 GeV/c are used to derive exclusive cross sections for reactions having one or more neutral strange particles in the final state. Particular attention is given to the estimation of the background. An upper limit of the cross section for the inclusive production of the charmed mesonD* is also given.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Comparison of Neutral Particle Production in 100-GeV/c anti-p p and p p Interactions.

Ward, D.R. ; Ansorge, R.E. ; Bust, C.P. ; et al.
Phys.Lett.B 62 (1976) 237-240, 1976.
Inspire Record 112616 DOI 10.17182/hepdata.5528

We derive cross-sections for the inclusive productiion in p̄p interactions at 100 GeV /c of π 0 , K S 0 and Λ 0 Λ 0 of 91.5±5.7 mb, 5.2±0.4 mb and 4.8±0.4 mb respectively, which are all higher than pp cross-sections at energy. We find indications that these differences can be attributed to “annihilation” processes.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


DETERMINATION OF CROSS-SECTIONS OF STRANGE PARTICLE PRODUCTION CHANNELS IN ANTI-P P INTERACTIONS AT 32-GeV/c. (IN RUSSIAN)

Bogolyubsky, M.Yu. ; Boos, E.G. ; Borovikov, A.A. ; et al.
Yad.Fiz. 39 (1984) 1436-1447, 1984.
Inspire Record 209441 DOI 10.17182/hepdata.17683

None

1 data table
Table 1

No description provided.


DIFFERENCES BETWEEN ANTI-P P AND P P INTERACTIONS AT 8.8-GeV/c AND THEIR RELATIONSHIP TO ANTI-P P ANNIHILATIONS

Booth, C.n. ; Ansorge, R.e. ; Carter, J.r. ; et al.
Phys.Rev.D 27 (1983) 2018, 1983.
Inspire Record 194364 DOI 10.17182/hepdata.23838

We report on an experiment in which the SLAC 40-in. hybrid facility was exposed to an 8.8-GeV/c antiproton beam. Using external detectors we have identified a large fraction of nonannihilation events and thus obtained a clean sample of annihilation data. Using proton interactions taken in the same detector at the same energy we have made a detailed study of (p¯p−pp) differences and explored their relationship to p¯p annihilations.

27 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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GENERAL FEATURES OF ANTI-P P INTERACTIONS AT 7.3-GEV/C

Patel, G.D. ; Johnson, P. ; Mason, P. ; et al.
Z.Phys.C 12 (1982) 189-202, 1982.
Inspire Record 179888 DOI 10.17182/hepdata.2239

Absolute inclusive cross sections for\(\bar pp\) interactions at 7.3 GeV/c are given. The data cover prong cross sections,V0, γ production and inclusive charged particle (p/π) production. Separation has been made into annihilation and non-annihilation components. Inclusive π+, π− production in the processes of\(\bar pp\) annihilation and non-annihilation are compared with simple quark models.

26 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

ANNIHILATION AND NON-ANNIHILATION TOPOLOGICAL CROSS SECTIONS.

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INCLUSIVE K0(S) LAMBDA AND anti-LAMBDA PRODUCTION IN anti-p p INTERACTIONS AT 22.4-GeV/c

The Alma Ata-Dubna-Helsinki-Moscow-Prague-Tbilisi collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Gramenitsky, I.M. ; et al.
Z.Phys.C 25 (1984) 213, 1984.
Inspire Record 194651 DOI 10.17182/hepdata.2004

InclusiveKs0, Λ and\(\bar \Lambda\)-production has been investigated in\(\bar p\)p-interactions at 22.4 GeV/c. Total and topological cross sections and multiplicity characteristics of neutral strange particles have been determined. DifferentialKs0 and Λ-cross sections and also characteristics of annihilation processes with neutral kaon production have been studied. It is shown that the difference of the shapes of the invariantx-distributions forK-mesons in the fragmentation region for annihilation and non-annihilation processes can be described in the framework of the “dual” valon model, but not by considering the current (undressed) quark recombination mechanisms only. The polarization of Λ and\(\bar \Lambda\)-hyperons has been measured.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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INCLUSIVE PRODUCTION OF NEUTRAL STRANGE PARTICLES IN ANTI-P P INTERACTIONS AT 70-GeV/c

Lemonne, J. ; Vanhomwegen, G. ; Wickens, J. ; et al.
Z.Phys.C 24 (1984) 103-110, 1984.
Inspire Record 207327 DOI 10.17182/hepdata.16319

The inclusive production ofKs0, Λ and\(\bar \Lambda \) particles is investigated in 70 GeV/c\(\bar pp\) interactions in an experiment performed at CERN using BEBC equipped with a TST. Differential cross-sections are studied and compared with corresponding data at surrounding energies. Differences withpp data obtained at the same energy allow an estimate of theKs0, production cross-section in annihilation processes. Evidence is also given for central\(\Lambda \bar \Lambda \) production.

1 data table
Table 1

No description provided.


Inclusive Production of $K^0_S$, $\Lambda$ and $\bar{\Lambda}$ in $\bar{p} p$ Interactions at 3.6-{GeV}/$c$

Banerjee, S. ; Ganguli, S.N. ; Malhotra, P.K. ; et al.
Nucl.Phys.B 150 (1979) 119-140, 1979.
Inspire Record 131498 DOI 10.17182/hepdata.34804

We present a study of the inclusive reactions p p → K S 0 X, ΛX and Λ X at 3.6 GeV/ c based on 35.4 events/μb. The cross sections are presented in terms of the Feynman variable, rapidity and the transverse momentum. The absolute value of the Λ polarization is found to increase with increasing p T of Λ. A comparison of the inclusive productions of K S 0 in p p and e + e − is presented.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

OTHER DATA AT PLAB=5.7 AND 12. GEV/C. ALSO INCLUDED.