P.G. Murphy

Inelastic diffractive scattering at the CERN ISR

ONLY ELASTIC CROSS SECTIONS ENCODED. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB. THIS RECORD IS ONE OF 11 WHICH HAVE BEEN BROKEN INTO SMALLER UNITS. SQRT(S)=23 TO 38 GEV. 0.3& lt;PT& lt;1.7,0.6& lt;X& lt;1.0,0.15& lt;ITI& lt;3.25 CERN-HOLLAND-BRITISH COLLAB.

Production of high-momentum mesons at small angles at a cm energy of 45 GeV at the CERN ISR

Abstract Inclusive cross sections for the production of π ± and K ± mesons in proton-proton collisions have been measured at a c.m. energy √ s = 45 GeV, in the range 0.41 x p T x = 2 p L/√ s and p L , p T are the longitudinal and transverse components of the momentum of the meson. Within the measured range the p T dependence of the invariant cross section is essentially independent of x and weakly dependent on the type of particle. For all particles the invariant cross sections at fixed p T fall by three orders of magnitude between x = 0.4 and 0.95. Except at the highest values of x and p T , the statistical accuracy is better than 10%. The data are compared with a triple-Regge model and with a simple quark-parton model.

Diffraction dissociation in proton-proton collisions at ISR energies

Data are presented on the reaction pp → pX in the range of four-momentum transfer squared 0.04 0.01. The total diffractive cross section integrated over t and M2/s up to M2/s=0.05 rises by approximately 15% from σdif=6.5±0.2 mb at 550 GeV2 to σdif=7.5±0.3 mb at 3880 GeV2.

Correlations associated with particles produced at small angles in pp collisions at the CERN ISR

Abstract Data on correlations between momentum analysed protons, pions or K mesons, and charged particles produced in pp collisions at the CERN ISR are presented. The charged particles were detected in a ∼4π scintillation counter hodoscope. The pseudo-rapidity distributions are well described by production within the limits of cylindrical phase space, with negative kaons and antiprotons yielding narrower distributions than protons, pions and positive kaons. The azimuthal distributions show symmetry around the t-channel axis in the rest frame of the recoiling mass Mx in pp → aX (a = detected proton, pion, positive kaon).

Search for stable particles of charge 1 and mass deuteron mass

In a search for stable massive particles of charge q ⩾ 1 at the CERN ISR (√s = 53 GeV) no new particle in the mass range q × 2.4 GeV < m ≲ 30 GeV has been found among 3.1 × 107 recorded secondaries. At x = 2pL/√s = 0.21 and pT = 0.21 GeV/c the deuteron to π+ ratio is (1.3±0.2) × 10−4 and the antideuteron to π− ratio is (7.6±2.3) × 10−6. for (anti)tritons upper limits of (t/π+) < 5 × 10−7and (t/π−7) < 5 × 10−7 have been obtained.

Correlations associated with small angle protons produced in proton- proton collisions at 31 gev total energy

High energy inelastic protons with x = 2 pL/s12 > 0.99 observed in 15.3/15.3 GeV proton-proton collisions at the CERN ISR are accompanied by particles whose angular distribution is confined to a narrow cone in the opposite direction. In constrast, lower energy protons (0.72 < x < 0.84) are accompanied in addition, by particles emitted at larger angles. The ratio of the associated charged multiplicities is approximately 0.4.

A search for narrow resonances in proton-proton collisions at 53 GeV centre-of-mass energy

Abstract A search for narrow resonances produced in pp collisions at the CERN ISR has been carried out using two magnetic spectrometers to measure and identify two-final-state charged hadrons. The resultant two-particle invariant mass spectra show no strong structure suggesting any new narrow resonance. The statistical significance of various enhancements seen in the data is discussed, and upper limits on the cross section times branching ratio for new particle production are presented.

Correlations in quasi-elastic proton-proton scattering at total c.m. energies of 23 and 31 GeV

Abstract Data are reported on angular and rapidity ( η ) distributions of a charged particle c produced in quasi-elastic proton-proton scattering (p+p→p+c+anything) at the CERN ISR.

A study of the reaction p + p → p + p + X at ISR energies

Abstract We have performed an experiment to investigate the reaction p + p → p 1 + p 2 + X at the CERN Intersecting Storage Rings (ISR). The dependence of the cross-section on the mass and rapidity of the system X, and on the momentum transfer squared t 1 , t 2 to the outgoing protons is studied. We observe signals for the production of ϱ , ω , f, and A 2 mesons in the missing-mass spectra, and conclusions are made about the contribution of double-Pomeron exchange.

Measurement of coherent elastic and inelastic deuteron-proton scattering at s = 2800 GeV2☆

Abstract Data on coherent elastic and inelastic deuteron-proton scattering are presented. The measurements were made at the CERN ISR with a single arm spectrometer, at s = 2800 GeV 2 and momentum transfer squared (− t ) in the range 0.15 to 0.42 GeV 2 . The data are compared with elastic and inelastic diffractive proton-proton scattering data taken with the same apparatus at the same s and t values. The t dependence of the elastic dp → dp differential cross section is compared to simple predictions based on Glauber theory. The differential cross sections for pp → pX and dp → dX are also compared for M X 2 → 280 GeV 2 , where M X denotes the mass of system X recoiling against the measured proton and deuteron.