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Study of charm photoproduction mechanisms

The NA14/2 collaboration Alvarez, M.P. ; Barate, R. ; Bloch, D. ; et al.

Z.Phys.C 60 (1993) 53-62, 1993.

Inspire Record 333271 DOI 10.17182/hepdata.14331

This paper presents results on charm photoproduction in the energy interval 40 to 160 GeV, obtained from the high-statistics charm samples of the NA 14/2 experiment at CERN. We measure the charm cross-section, the distributions inxF andp2T and various production ratios and charge asymmetries. The total non-diffractive open-charm cross-section per nucleon is measured to be$\sigma _{(\gamma N \to c\bar cX)} $ at 〈Eγ〉 =100 GeV. We discuss the photoproduction of charm in terms of theoretical and phenomenological models. We compare the measuredp2T andxF distributions with first-order QCD calculations of photon-gluon fusion and obtain a value for the charm-quark mass ofmc=1.5+0.2−0.1GeV/c2.

10 data tables

Table 1

D0 cross section assuming branching ratio of D0 --> K- PI+ of 3.65 +- 0.21 PCT.

Table 2

D+(-) cross section assuming branching ratio of D+ --> K- PI+ PI+ of 8.0 +0.8,-0.7 PCT.

Table 3

Total non diffractive open charm production cross section allowing for contributions for other charmed particles (D/S and LAMBDA/C). Comparison of data with first order QCD leads to a predicted charm quark mass of 1.5 +0.2,-0.1 GeV.

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Difference of nonannihilation anti-p p interactions at 22.4-GeV/c from p p interactions at close energy

Batyunya, B.V. ;

JINR-1-89-28, 1989.

Inspire Record 292242 DOI 10.17182/hepdata.54979

The longitudinal and transverse momentum distributions of protons and π±-mesons, produced and pp interactions at close energy (22-24 GeV), are compared. The existence of a difference between these (P<1.2 GeV/c in laboratory system) and for mesons accompaying them, is shown. The observed difference increases with increasing the multiplicity of charged particles. For π+ mesons it increases with decreasing the momentum of accompaying protons. These effects do not practically exist for π- mesons

34 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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STUDY OF THREE-BODY REACTIONS K+ p ---> K+ K+ LAMBDA AND K+ p ---> p p anti-LAMBDA AT 32-GeV/c

Chliapnikov, P.V. ; Gerdyukov, L.N. ; Makharadze, T.G. ;

Sov.J.Nucl.Phys. 46 (1987) 89, 1987.

Inspire Record 235218 DOI 10.17182/hepdata.10555

None

14 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (?////DECAY-BR(BRN=LAMBDA --> P PI-)//DECAY-BR(BRN=ALAMBDA --> AP PI+)).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////DECAY-BR(BRN=LAMBDA --> P PI-)//DECAY-BR(BRN=ALAMBDA --> AP PI+)).

Table 3

Axis error includes +- 0.0/0.0 contribution (?////DECAY-BR(BRN=LAMBDA --> P PI-)//DECAY-BR(BRN=ALAMBDA --> AP PI+)).

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BOSON RESONANCES PRODUCTION IN anti-p p INTERACTIONS AT 32-GeV/c

Kozlovsky, E.A. ; Bumazhnov, V.A. ; Zakamsky, L.L. ; et al.

Sov.J.Nucl.Phys. 44 (1986) 624-630, 1986.

Inspire Record 223220 DOI 10.17182/hepdata.40834

None

14 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Authors

Study of charm photoproduction mechanisms

Difference of nonannihilation anti-p p interactions at 22.4-GeV/c from p p interactions at close energy

STUDY OF THREE-BODY REACTIONS K+ p ---> K+ K+ LAMBDA AND K+ p ---> p p anti-LAMBDA AT 32-GeV/c

BOSON RESONANCES PRODUCTION IN anti-p p INTERACTIONS AT 32-GeV/c

STUDY OF THE REACTION K+ P ---> LAMBDA P X AT 32-GeV/c. (IN RUSSIAN)

ASSOCIATED PRODUCTION OF THE K*+ (890) WITH OTHER PARTICLES AND THE RHO0 WITH OTHER PARTICLES IN INCLUSIVE K+ P REACTIONS AT 32-GEV/C

Study of the inclusive production of strange boson resonances in anti-p p interactions at 32-GeV/c.

INCLUSIVE K0(S) LAMBDA, K0(S) anti-LAMBDA AND LAMBDA anti-LAMBDA PAIR PRODUCTION IN K+ p INTERACTIONS AT 32-GeV/c

Reactions With Two Neutral Kaons Inclusive Production in $K^+ p$ Interactions at 32-{GeV}/$c$

Quark and Diquark Fragmentation Into Strange Particles in $\pi^- p$ Interactions at $P=40$-{GeV}/$c$