S.N. Ganguli

Further results on cerium fluoride crystals

Abstract A systematic investigation of the properties of cerium fluoride monocrystals has been performed by the “Crystal Clear” collaboration in view of a p

Regge phenomenology of inclusive reactions

Abstract This project is devoted to updating the Regge phenomenology of inclusive reaction and correlation, with the help of the low pT data acquired over the last 5 years or so. The analyses over the fragmentation region are largely based on the Mueller-Regge formalism. For the central cross-section and correlation data, however, the Mueller-Regge formalism is seen to be inadequate; and the analyses are largely based on the multiperipheral cluster model and the Gribov calculus. The effort has been to make the individual sections self-contained, at the cost of some duplication. The important gaps remaining in the data, as also in the theoretical interpretation of the available data, are brought out at the end of the relevant sections.

DEPENDENCE OF MULTIPLICITY ON ENERGY IN HIGH-ENERGY p--p COLLISIONS.

Abstract The available data on multiplicity of charged particles in the range 4 to 10 4 GeV/ c has been analysed. The following conclusions have been drawn: (i) prediction of statistical and hydrodynamical model is surprisingly well borne out by the data; (ii) the prediction of isobar-pionisation type of models disagrees with the data, and (iii) assuming an asymptotic behaviour of multiplicity as log s , the approach to this seems to be characterized by s − α , with α ≈ 0.2−0.3.

Observation of a dip-bump structure in differential cross section for pp → nn in the 700–760 MeV/c momentum range

Abstract Based on a sample of about 3500 events, we have measured the total and differential cross sections of p p → n n in the 700–760 MeV/c incident momentum region. It is found that σCE = 10.7 ± 0.2 mb at the average momentum of 730 MeV/c. The differential angular distribution is characterised by a sharp peak and a dip in the forward direction followed by a secondary maximum. The position of the dip corresponds to |t| ≈ mπ2. These results are compared with the predictions of the model of Bryan-Phillips. On the other hand, this dip-bump structure can be well understood on a simple picture involving a π exchange and a constant background (for |t| ≲ 3 mπ2).

Energy dependence of 〈n(n−1)〉 and 〈n〉/D in high energy pp collisions from 13 to 104 GeV/c

The energy dependence of and /D for charged particles, in the broad range 12.9 to 10 4 GeV/c, is compared with the predictions of fragmentation models and the multiperipheral models. It is concluded that the data favours the multiperipheral models.

Prediction of angular distribution of neutral pions from γ-ray data at ISR energies

Abstract The experimental data on the absolute angular distribution of γ-rays from p-p collisions at the ISR have been analysed to deduce angular distribution of the neutral pions and also all created charged particles. The average multiplicity of all created charged particles at Ecm = 44.7 GeV is estimated to be 9.8 ± 1.5.