HEPData Search

We present a summary of the physics results from an experimental study of the reaction π−p→π−π+n at 100 and 175 GeV/c incident-beam momentum. Our data show the continuing dominance of one-pion exchange in these reactions with the characteristic 1Plab2 momentum dependence. We extract the pion Regge trajectory from our data on π−p→ρ0n and study the zero structure of the ππ differential cross section up to sππ=12 GeV2.

9 data tables

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SPHERICAL HARMONIC MOMENTS.

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$\rho^0$ Production in Deep Inelastic $\mu p$ Interactions

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 133 (1983) 370-374, 1983.

Inspire Record 192074 DOI 10.17182/hepdata.30613

Inclusive ϱ 0 meson production has been measured in 120 GeV and 280 GeV muon-proton interactions. Distributions of z and p T 2 are presented. Primary ϱ 0 production is found to be equal to that of π 0 production within errors.

2 data tables

Table 1

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Measurement of the Neutron and Proton Structure Functions From Neutrino and Anti-neutrinos Scattering in Deuterium

The WA25 collaboration Allasia, D. ; Angelini, C. ; Baldini, A. ; et al.

Phys.Lett.B 135 (1984) 231, 1984.

Inspire Record 192102 DOI 10.17182/hepdata.30611

Data from an exposure of the BEBC bubble chamber filled with deuterium to neutrino and antineutrino wide band beams have been used to extract the x dependence of the structure functions for scattering on protons and neutrons and the fractional momentum distributions of the valence quarks and the antiquarks of different flavours. The difference F n 2 − F p 2 is compared with recent data from high energy μD scattering. A result is also obtained on the sum rule giving the difference between the number of up and down quarks in the nucleon.

1 data table

Table 1

No description provided.

anti-p p ELASTIC SCATTERING AT 30-GeV/c INCIDENT MOMENTUM IN THE MOMENTUM TRANSFER RANGE 0.5-GeV/c2 < -t < 5.8-GeV/c2

The Annecy(LAPP)-CERN-Bohr Inst-Genoa-Oslo-London collaboration Asad, Z. ; Baglin, C. ; Bock, R. ; et al.

Phys.Lett.B 130 (1983) 335-339, 1983.

Inspire Record 191868 DOI 10.17182/hepdata.30657

The p p elastic differential cross section at 30 GeV/ c incident momentum has been measured in a two-arm spectrometer experiment (WA7) at the CERN SPS. The | t |-range covered extends from 0.5 to 5.8 (GeV/ c ) 2 . A pronounced dip-bump structure is observed, with a sharp minimum around | t | ≈ 1.7 (GeV/ c ) 2 . The results are compared with existing p p data at lower energies and with our earlier p p data at 50 GeV/ c . A number of model predictions are discussed. We also compare the p p 30 GeV/ c differential cross section with that of pp at the same momentum. Finally, the energy dependence of the p p fixed-| t | differential cross in the incident momentum range 3.6 to 50 GeV/ c is presented.

1 data table

Table 1

NUMERICAL VALUES SUPPLIED BY D. IMRIE. ERROR CONTAINS BOTH STATISTICS AND SYSTEMATICS.

Further Evidence for Charged Intermediate Vector Bosons at the SPS Collider

The UA1 collaboration Arnison, G. ; Astbury, A. ; Aubert, Bernard ; et al.

Phys.Lett.B 129 (1983) 273-282, 1983.

Inspire Record 191741 DOI 10.17182/hepdata.30659

A sample of 52 Intermediate Vector Boson decays in the ( v e e) channel is described. They were produced at the CERN SPS Collider for an integrated luminosity of 0.136 pb −1 . Both production and decay properties fit well with expectations from the Standard Model of weak interactions. An improved value for the W mass is given and compared with the previously published value for the Z 0 mass.

1 data table

Table 1

No description provided.

Inclusive Production of Direct Photons in 200-{GeV}/$c$ Collisions

McLaughlin, M. ; Biel, J. ; Bromberg, C. ; et al.

Phys.Rev.Lett. 51 (1983) 971, 1983.

Inspire Record 191763 DOI 10.17182/hepdata.20473

The authors have measured the inclusive production of direct photons in the transverse momentum (pT) range 2.1-5.0 GeV/c in 200-GeV/c collisions of protons and π+ mesons on a carbon target. A significant yield of direct photons was observed for pT>2.5 GeV/c. The invariant cross section for direct-photon production, when compared with measurements from the CERN intersecting storage rings, can be expressed in terms of pT and xT=2pTs as (42±14)(1−xT)8.1±1.0pT−6.6±0.3 μb/GeV2 for the c.m. energy range from s=19.4 to 63 GeV, and for the xT range from 0.2 to 0.5.

2 data tables

Table 1

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Nuclear Enhancement of pi0 and eta mesons Produced at Large Transverse Momenta

Povlis, J. ; Biel, J. ; Bromberg, C. ; et al.

Phys.Rev.Lett. 51 (1983) 967, 1983.

Inspire Record 191764 DOI 10.17182/hepdata.20477

The authors have measured the large-pT inclusive cross sections for π0 and η production near 90° in the center-of-mass system in 200-GeV/c π+ and proton collisions with beryllium, carbon, and aluminum targets. The cross section for both π0 and η mesons rises with increasing nucleon number (A) of the target nucleus as Aα, with α>1. The ratio of the π0 yield in pA collisions to that in π+A collisions decreases with increasing pT.

2 data tables

Table 1

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