Nuclear-target diffraction dissociation inπ + and K+ collisions with Au and Al at 250 GeV/c

Abstract

Onderzoeksleider NFWO, Belgium EC guest scientist, now at DESY, Hamburg Parton Model.are compared with results obtained by Monte·Carlo simulation according to a two-component Dual particles suggest re-scattering of the emitted particles on other nucleons of the nucleus. All these facts dependence of the emitted proton multiplicity and the angular distributions of the produced charged of negative particles produced diffractively is found not to be sensitive to the nuclear mass. The A on the t-dependence of the cross section are fitted in the usual exponential form. The mean multiplicityAbstract. An analysis of the A-dependence of the target-diffractive cross-section is presented. Data to the squared four-momentum transfer region --t > 0.025 GeV2 due to the trigger bias in the very of the trigger weights used in the interval 0.1 >-t > 0.025 GeV2 is 2.29. We restrict the analysis each reconstructed event from the overall azimuthal symmetry around the beam axis. The mean value [13]. This weight depends strongly on the spatial characteristics of the event. It is determined for weight. Futhermore, each event is weighted to correct for losses induced by the interaction trigger of the track and the topology of the event and events are weighted with a multiplicity dependent In order to compensate for losses due to item 3, tracks are weighted depending on the charge 4. the event is not a candidate for an elastic or coherent interaction with the nucleus. on the event topology; 3. the loss of tracks due to measurement or reconstruction failures is limited in number, depending 2. the interaction vertex is within one of the nuclear foils;1. The beam track is well measured and reconstructed; [12]. They can be summarized as follows:The selection criteria for the event and track sample are described in detail in our earlier paper momentum up to 1.2 GeV/c. use ionization measurements to identify slow charged particles, mainly recoil protons, with laboratory have been detected in a single experiment. As a vertex detector, the RCBC provided a good tool to a vertex detector simultaneously. Thus, interactions with hydrogen as well as with Al and Au nuclei 0.64 mm, respectively, corresponding to 0.5% of an interaction length, has been used as a target and with two nuclear targets consisting of an aluminium and a gold foil with thickness of 2.5 mm and about the parton structure of nucleons inside the nucleus or on the dynamics of Pomeron interaction both experimentally and theoretically. This, in spite of the fact that such a process could give clues of experiments [1][2][3][4][5][6][7][8]. Nuclear target diffraction dissociation, on the other hand, is scarcely studied,

Boson interferometry in high-energy physics

“…For this reason the space-time integration at fixed Q has been used recently [35] also in the study of higher order correlations and applied to the NA22 data [233]. It was found among other things that an expanding source with fixed parameters as defined in 88 The older UA-1 data [31] were limited to larger Q 2 values.…”

“…chapter 4 can account for the data up to and including the fourth order, confirming in a first approximation the Gaussian form of the density matrix. The fact that previous attempts in this direction like [233] and [34] met with difficulties may be due to the fact that in these two experimental studies the QO formalism in momentum space was used and possibly also because no simultaneous fit of all orders of correlations was performed, as was the case in [35].…”

Systematics of leading particle production

“…The authors of ref. [2] tried to fit their measured proton spectrum with the FRITIOF code and could not obtain a good description of data. This indicates that these large x points are a problem for standard multiparticle production models as well.…”

“…(2) max = 1 and χ nd 0 and χ d j0 are the proper normalization factors assuring that 1 0 dx L F LP (x L ) = 1. We separately normalize to unity both components entering (2). This procedure is crucial in our case in order to assure the proper overall energy momentum conservation, which is a characteristic feature of any implementation of the IGM.…”

“…In high energy hadron-hadron collisions the momentum spectra of outgoing particles which have the same quantum numbers as the incoming particles, also called leading particle (LP) spectra, have been measured already some time ago [1]. Recently new data on pion-proton collisions were released by the EHS/NA22 collaboration [2] in which the spectra of both outcoming leading particles, the pion and the proton, were simultaneously measured. Very recently data on leading protons produced in eletron-proton reactions at HERA with a c.m.s.…”