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FRAGMENTATION IN NEUTRINO AND ANTI-NEUTRINOS CHARGED CURRENT INTERACTIONS ON PROTON AND NEUTRON

The AMSTERDAM-BERGEN-BOLOGNA-PADUA-PISA-SACLAY-TURIN collaboration Allasia, D. ; Angelini, C. ; Baldini, A. ; et al.
Z.Phys.C 24 (1984) 119-131, 1984.
Inspire Record 207322 DOI 10.17182/hepdata.16217

Some experimental properties of the charged hadronic fragments are compared for νp, νn,\(\bar vp\) and\(\bar vn\) interactions: multiplicities of forward and backward going particles,xF distributions for pions, fragmentation functions and theirQ2 andW2 dependence. The results are compared with the predictions of the Lund fragmentation model.

1 data table

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FRAGMENTATION INTO STRANGE PARTICLES IN HIGH-ENERGY NEUTRINO P, neutrino N, ANTI-NEUTRINO P AND ANTI-NEUTRINO N INTERACTIONS

The AMSTERDAM-BERGEN-BOLOGNA-PADUA-PISA-SACLAY-TURIN collaboration Allasia, D. ; Angelini, C. ; Baldini, A. ; et al.
Phys.Lett.B 154 (1985) 231-235, 1985.
Inspire Record 218756 DOI 10.17182/hepdata.30415

The fragmentation of the hadronic system into Λ, Σ(1385), K ) and K ∗ (892) in deep-inelastic charged-current interactions of high energy neutrinos and antineutrinos with proton and neutron is analyzed. The results obtained for the production of these particles from the various initial states are compared with each other and with the predictions of the Lund fragmentation model. This comparison shows that a spectator diquark does not fragment as a whole in a fraction of the interactions. The role of the sea quarks in the baryon formation process is underlined. Strange vector and pseudoscalar mesons are likely to be produced at similar rates.

3 data tables

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SIG(C=LAMBDA) denotes the inclusive LAMBDA production in the same reaction.

SIG(C=KS) denotes the inclusive KS production in the same reaction.


Multiplicities of Secondary Hadrons Produced in Neutrino $p$ and Anti-neutrino $p$ Charged Current Interactions

The Aachen-Birmingham-Bonn-CERN-London-Munich-Oxford collaboration Grassler, H. ; Lanske, D. ; Schulte, R. ; et al.
Nucl.Phys.B 223 (1983) 269-295, 1983.
Inspire Record 189061 DOI 10.17182/hepdata.33964

In an experiment with the hydrogen bubble chamber BEBC at CERN multiplicities of hadrons produced in νp and v p interactions have been investigated. Results are presented on the multiplicities of charged hadrons and neutral pions, forward and backward multiplicities of charged hadrons and correlations between forward and backward multiplicities. Comparisons are made with hadronic reactions and e + e − annihilation. In the framework of the quark-parton model the data imply similar charged multiplicities for the fragments of a u- and a d-quark, and a larger multiplicities for the fragments of a uu- than for a ud-diquark. The correlation data suggest independent fragmentation of the quark and diquark for hadronic masses above ∼ 7 GeV and local charge compensation within an event.

8 data tables

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Data on the Gross-llewellyn Smith Sum Rule as a Function of $q^2$

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Bolognese, T. ; Fritze, P. ; Morfin, J. ; et al.
Phys.Rev.Lett. 50 (1983) 224, 1983.
Inspire Record 178566 DOI 10.17182/hepdata.20544

Data are presented on the Gross-Llewellyn Smith sum rule obtained from combined narrow-band neon and Freon bubble-chamber neutrino-antineutrino experiments. Remarkably no significant deviation from the parton-model prediction for the sum rule is observed at very low values of q2≲1 GeV2. Limits on the effective QCD scale parameter Λ and on the magnitude of the twist-4 correction are set. The best fit, neglecting higher-twist contributions, gives Λ=92−36+20 MeV.

1 data table

NACHTMANN MOMENT IS EVALUATED (IE TARGET MASS COEERCTIONS INCLUDED).


Measurement of the Ratios of Neutral Current to Charged Current Cross-sections of Neutrino and Anti-neutrinos Interactions in Ne

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Bosetti, P.C. ; Fritze, P. ; Grassler, H. ; et al.
Nucl.Phys.B 217 (1983) 1-10, 1983.
Inspire Record 12766 DOI 10.17182/hepdata.33963

The ratios of neutral current to charged current cross sections of neutrino and antineutrino interactions in heavy Ne/H 2 mixture have been measured in BEBC. The beam was the CERN SPS 200 GeV/ c narrow band beam. The ratios were obtained using a cut in the transverse momentum of the hadronic system. In the standard Glashow-Salam-Weinberg model, our results correspond to the value of sin 2 θ w = 0.182 ± 0.020 ± 0.012. By combining this experiment with data from a hydrogen target the coupling constants u L 2 and L 2 are found to be 0.15 ± 0.04 and 0.19 ± 0.05, respectively.

2 data tables

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Comparison of Nucleon Structure Functions in Bubble Chamber Neutrino Experiments With {QCD} Predictions

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Bosetti, P.C. ; Fritze, P. ; Grassler, H. ; et al.
Nucl.Phys.B 203 (1982) 362-384, 1982.
Inspire Record 177120 DOI 10.17182/hepdata.34172

None

1 data table

ERRORS SHOWN ARE STATISTCAL. STRUCTURE FUNCTIONS COMPUTED ASSUMING CALLAN-GROSS RELATION.


Analysis of Fragmentation Functions of Narrow Band Neutrino and Anti-neutrino Interactions on an Isoscalar Target

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Deden, H. ; Fritze, P. ; Grassler, H. ; et al.
Nucl.Phys.B 198 (1982) 365-379, 1982.
Inspire Record 11149 DOI 10.17182/hepdata.34174

None

2 data tables

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Transverse Momentum of Hadrons Produced in Neutrino and Anti-neutrino Interactions on an Isoscalar Target in BEBC

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Deden, H. ; Fritze, P. ; Grassler, H. ; et al.
Nucl.Phys.B 181 (1981) 375, 1981.
Inspire Record 153272 DOI 10.17182/hepdata.34301

The average transverse momentum squared, 〈 p ⊥ 2 〉, of hadrons is studied as a function of W 2 and of Q 2 for ν and ν interactions on an isoscalar target. An increase of 〈 p ⊥ 2 〉 with W 2 is observed for the hadrons emitted forward in the hadronic c.m.s. The p ⊥ dependence of the fragmentation function is found to factorise from the structure function at fixed W , but does not factorise at fixed Q 2 . Unlike the case of forward-going particles, the 〈 p ⊥ 2 〉 of hadrons going backward in the c.m.s. shows no strong dependence on W 2 .

4 data tables

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Total Cross-sections for $\nu_\mu$ and $\bar{\nu}_\mu$ Charged Current Interactions Between 20-{GeV} and 200-{GeV}

The Aachen-Bonn-CERN-Democritos-London-Oxford-Saclay collaboration Bosetti, P. ; Deden, H. ; Fritze, P. ; et al.
Phys.Lett.B 110 (1982) 167-172, 1982.
Inspire Record 169123 DOI 10.17182/hepdata.30976

Exposures of the Ne/H 2 filled Big European Bubble Chamber (BEBC) to a dichromatic neutrino (antineutrino) beam produced by 400 GeV protons of the CERN SPS yielded ∼ 3100 events with a negative, and ∼ 1100 with a positive, muon. The neutrino flux is determined from the muon flux in the shielding. Assuming a linear energy dependence of the cross section, the values σ E between 20 and 200 GeV are found to be 0.657 ± 0.012 (stat.) ± 0.027 (syst.) and 0.309 ± 0.009 (stat.) ± 0.013 (syst.) cm 2 (GeV nucleon) −1 , for neutrinos and antineutrinos, respectively. The scaling variable q 2 E decreases significantly with increasing energy both for neutrinos and antineutrinos.

3 data tables

Measured charged current total cross section.

Measured charged current total cross section.

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Analysis of Nucleon Structure Functions in CERN Bubble Chamber Neutrino Experiments

The Aachen-Bonn-CERN-London-Oxford-Saclay collaboration Bosetti, P.C. ; Deden, H. ; Deutschmann, M. ; et al.
Nucl.Phys.B 142 (1978) 1-28, 1978.
Inspire Record 6678 DOI 10.17182/hepdata.35031

We present results for the differential cross sections of neutrinos and antineutrinos on nucleons in the energy range E = 2−200 GeV, from the BEBC and Gargamelle experiments. The structure functions F 2 , 2 χF 1 and χF 3 have been evaluated as a function of χ and q 2 . Deviations are observed from Bjorken scaling, which are very similar to those found in electron and muon inelastic scattering. For the Callan-Gross ratio, we find 2χF 1 F 2 = 0.80 ± 0.12 and the corresponding value for 〈R〉 = 〈 σ S σ T 〉 = 0.15 ± 0.10 . Our results are consistent with the Gross-Llewellyn-Smith sum rule; we measure ⩾2.5 ± 0.5 valence quarks per nucleon. Quark and antiquark distributions are given. The Nachtmann moments of F 2 and χF 3 are quantitatively consistent with the predictions from QCD. The value of the strong interaction parameter is λ = 0.74 ± 0.05 GeV without corrections, and 0.66 ± 0.05 GeV including α S 2 corrections. The moments of the gluon distribution are found to be positive and indicate an χ distribution of gluons which is comparable with that of the valence quarks.

2 data tables

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