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

doi:10.1016/0550-3213(76)90099-7

Nuclear Physics B

Volume 102, Issue 2, 12 January 1976, Pages 275-296

, , , , , , , , , , , , , , , , , , ,

https://doi.org/10.1016/0550-3213(76)90099-7 Get rights and content

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 M_x in pp → aX (a = detected proton, pion, positive kaon).

References (14)

H. Dibon et al.
Phys. Letters
(1973)
S.R. Amendolia et al.
Phys. Letters
(1974)
K. Eggert et al.
Nucl. Phys.
(1975)
M.G. Albrow et al.
Phys. Letters
(1974)
M.G. Albrow et al.
Phys. Letters
(1973)
M.G. Albrow et al.
Phys. Letters
(1974)
M.G. Albrow et al.
Phys. Letters
(1972)
P. Kooijman, M. Sc. Thesis, University of Utrecht,...

There are more references available in the full text version of this article.

Cited by (36)

Measurements of single diffraction at √s = 630 GeV; Evidence for a non-linear α(t) of the pomeron
1998, Nuclear Physics B
We report measurements of the inclusive differential cross section for the single-diffractive reactions $p_{i} + p^{−} → p_{ƒ} + X$ and $p + p^{−}_{i} → X + p^{−}_{ƒ} at √s = 630 GeV$ , in the momentum transfer range 0.8 < −τ < 2.0 GeV² and final-state Feynman-x_p > 0.90. Based on the assumption of factorization, several new features of the pomeron flux factor are determined from simultaneous fits to our UA8 data and lower energy data from the CHLM collaboration at the CERN Intersecting Storage Rings.
Prominent among these is that the effective pomeron Regge trajectory requires a term quadratic in τ, with coefficient α″ = 0.079 ± 0.012 GeV⁻⁴. We also show that the data require a pomeron-proton cross section that first decreases with increasing diffractive mass (corresponding to the PPR term in the triple-Regge expansion) and then increases at larger mass (the PPP term), similar to real particle total cross sections. We measure the product Kσ₀ = 0.72 ± 0.10 mb GeV⁻², where K is the normalization constant of the pomeron flux factor in the proton and σ₀ is the scale constant in the pomeron-proton total cross section. Finally, we report the occurrence of “beam jets” in the pomeron direction in the rest frame of the diffractive system.
Diffraction dissociation An experimental and phenomenological review
1990, Nuclear Physics B (Proceedings Supplements)
Minijets and the real part of the elastic amplitudes
1988, Physics Letters B
UA5: A general study of proton-antiproton physics at √s=546 GeV
1987, Physics Reports
The cross section of diffraction dissociation at the cern SPS collider
1987, Physics Letters B
Single diffraction dissociation was measured in the reaction $\bar{p} p \to \bar{p} X$ at the centre-of-mass energy √s = 546 GeV. The mass M of the system X was deduced from the pseudorapidity distribution of the observed charged tracks. The cross section of single diffraction dissociation for M²/s⩽0.05isσ_sd=9.4 ± 0.7 mb. Comparison to the ISR data shows that σ_sd increases with energy less fast than the total and the elastic cross sections.
Observation of longitudinal event structure in proton diffractive dissociation at the ISR
1986, Physics Letters B
We study the internal structure of a forward-going pπ⁺ π⁻ π⁺ π⁻ system, with invariant mass in the range 2.5-4 GeV, produced through diffractive dissociation of a beam proton at the ISR. The shape of the system, as seen in its center-of-mass, deviates strongly from isotropic phase space and possesses, rather, a longitudinal structure with a major axis along the incoming proton direction. The final state proton momentum is aligned in the direction of the incoming proton, an effect which becomes more pronounced with increasing diffractive mass.

View all citing articles on Scopus

⁽¹⁾: Present address: Daresbury Laboratory, Daresbury, Warrington WA4 4AD, Ches., U.K.

⁽²⁾: Present address: Lecroy Research Systems Ltd., 74 High St., Wheatley, Oxford 0X9 1XP, U.K.

⁽³⁾: Present address: Phys. Dept., University of Maryland, College Park, MD 20742, U.S.A.

⁽⁴⁾: Present address: Phys. Dept., Harvard University, Cambridge, MA 02138, U.S.A.

View full text

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

Abstract

Phys. Letters

Phys. Letters

Nucl. Phys.

Phys. Letters

Phys. Letters

Phys. Letters

Phys. Letters