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Production of Charmonium in 250-GeV mu+ - Iron Interactions

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.
Nucl.Phys.B 213 (1983) 1-30, 1983.
Inspire Record 180791 DOI 10.17182/hepdata.34060

The production of J/ ϑ and ϑ′ has been measured in 250 GeV muon iron interactions. The measured total cross sections are σ ( μ N → μ J/ ϑ X)=0.74±0.14 nb and σ ( μ N → μϑ ′X)=0.16 ± 0.07 nb. An upper limit on the cross section times branching ratio for ϒ production of BR · σ ( μ N → μϒ X) < 5.2 × 10 −38 cm 2 (at 90% confidence level) is obtained. About half the J/ ϑ cross section is found to have Z ⩾ 0.95 (where Z = E (J/ ϑ / ν ). The first-order photon-gluon fusion model agrees well with the measured Q 2 and ν dependence of the J/ ϑ data and is used to extract the gluon momentum distribution. However, higher order QCD effects are needed to explain the Z distribution of the J/ ϑ and the observed broadening of the P t 2 distribution with decreasing Z . The decay angular distributions of the J/ ϑ are found to be flat in the s -channel frame, but there is evidence for polarisation in the t -channel frame.

5 data tables
Table 1

NUMBERS ARE CROSS-SECTIONS FOR PSI AND PSI(PRIME) BUT CROSS-SECTION*BR.RATIO FOR THE UPSILON.

Table 2

THE COHERENT PRODUCTION IS NOT SUBTRACTED.

Table 3

THE COHERENT PRODUCTION IS SUBTRACTED.

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Measurement of differential cross sections for processes $\gamma d\to p n$, $\pi^0 d$, and $p X$ in the energy range of dibaryon resonances

Baba, K. ; Endo, I. ; Fukuma, H. ; et al.
Phys.Rev.C 28 (1983) 286-293, 1983.
Inspire Record 195610 DOI 10.17182/hepdata.26333

The differential cross section for the reactions γd→pn, γd→π0d, and γd→pX has been measured by using a tagged photon beam in the energy range of dibaryon resonances. The most characteristic feature of the data for γd→pn is a forward nonpeaking angular distribution. This behavior is in complete disagreement with the existing predictions which take into account the dibaryon resonances. A phenomenological analysis is made by slightly modifying the model of the Tokyo group, but no satisfactory result is obtained. The data for γd→π0d at large angles show that the differential cross section decreases exponentially as a function of pion angle. A comparison is made with a Glauber model calculation. The result seems to be rather in favor of the existence of dibaryon resonances, but a clear conclusion is not possible because of a lack of more accurate data. In the process γd→pX, a broad peak due to quasifree pion production is observed, but the limitation of experimental sensitivity does not allow us to have a definite conclusion for the dibaryon resonance of mass 2.23 GeV conjectured by the Saclay group.

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

FOR ANGLES >16 DEG THE OVERALL UNCERTAINTY IN ABSOLUTE NORMALIZATION IS ABOUT 10%.

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MEASUREMENT OF INCLUSIVE CROSS-SECTIONS pi-, pi+, p, H-2, H-3, He-3 AT ANGLE of 3.5-degrees IN THE INTERACTION OF 10.1-GeV/c PROTONS WITH Be, Al, Cu, Ta AND COMPARISON WITH THE FUSION MODELS

Vorontsov, I.A. ; Ergakov, V.A. ; Safronov, G.A. ; et al.
ITEP-83-085, 1983.
Inspire Record 192084 DOI 10.17182/hepdata.40192

None

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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DELTA ISOBAR EXCITATION IN CARBON NUCLEI AT 4.4-GEV/C - 10.7-GEV/C IN CHARGE EXCHANGE REACTION (HE-3, T).

The DUBNA-MOSCOW-KIEV-DUSHANBE collaboration Ableev, V.G. ; Kobushkin, A.P. ; Kurepin, A.B. ; et al.
Conf.Proc.C 830821V2 (1983) 267-268, 1983.
Inspire Record 194973 DOI 10.17182/hepdata.39517

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


TWO PARTICLE INCLUSIVE AND SEMIINCLUSIVE RAPIDITY DISTRIBUTIONS OF pi+- MESONS IN K- p INTERACTIONS AT 32-GeV/c

The USSR-CERN collaboration Bumazhnov, V.A. ; Babintsev, V.V. ; Bogolyubsky, M.Yu. ; et al.
Sov.J.Nucl.Phys. 40 (1984) 96, 1984.
Inspire Record 190549 DOI 10.17182/hepdata.10678

None

83 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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PION PRODUCTION AT 180-degrees IN NUCLEUS-NUCLEUS COLLISIONS

Chessin, Stephen Alan ;
LBL-14262, 1983.
Inspire Record 196037 DOI 10.17182/hepdata.38160

None

27 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of K mesons in collisions of relativistic carbon nuclei with led and copper nuclei

Gavrilov, O.K. ;
MINR-P-0359, 1984.
Inspire Record 1501546 DOI 10.17182/hepdata.76485

None

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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{Drell-Yan} Events From 400-{GeV}/$c$ Protons: Determination of the $K$ Factor in a Large Kinematical Domain

The NA3 collaboration Badier, J. ; Boucrot, J. ; Bourotte, J. ; et al.
Z.Phys.C 26 (1985) 489, 1985.
Inspire Record 199644 DOI 10.17182/hepdata.16140

We present the analysis of ∼30,000 high mass dimuons (Mμμ>4.5 GeV/c2) produced in 400 GeV/c proton-platinum interactions. A determination of theK-factor is given for different values ofxF andMμμ, and its variations are compared to QCD predictions. The proton structure functions derived from these events are compared to the values obtained in deep inelastic lepton scattering.

1 data table
Table 1

No description provided.


CHARACTERISTICS OF PROTON PRODUCTION IN JETS FROM e+ e- ANNIHILATION AT 29-GeV

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Badtke, D.H. ; et al.
Phys.Rev.Lett. 53 (1984) 130, 1984.
Inspire Record 201475 DOI 10.17182/hepdata.20437

Proton production in e+e− annihilation at 29 GeV has been studied with the time projection chamber. Measurements of the dependence of proton fractions on momentum, transverse momentum with respect to the jet axis, hadron multiplicity, and event sphericity are reported. Our results are consistent with the assumption that primary baryons and mesons have similar production spectra, and indicate that protons provide more direct probes of underlying fragmentation phenomena than do pions.

1 data table
Table 1

No description provided.


Measurement of $\nu$ and $\bar{\nu}$ structure functions in hydrogen and iron

Abramowicz, H. ; Hansl-Kozanecka, T. ; May, J. ; et al.
Z.Phys.C 25 (1984) 29-43, 1984.
Inspire Record 201386 DOI 10.17182/hepdata.49653

The CDHS neutrino detector has been used to measure events originating in a tank of liquid hydrogen and in the iron of the detector. Total cross-sections, differential cross-sections, and structure functions are given for hydrogen and compared with those in iron. The measurements are in agreement with the expectations of the quark parton model. No significant differences indicative of nuclear binding effects in corresponding structure functions of protons and iron are observed. This may be of special interest in the case of the sea structure functions, since large differences are expected in some models.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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