• P K Malhotra

      Articles written in Pramana – Journal of Physics

    • Neutral-charged particle correlations in proton-proton collisions in the framework of a two-component model

      V Gupta P K Malhotra

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      The data on$$\bar N_0 \left( {n\_} \right)$$, the average number of neutrals as a function ofn, the number of negatively charged particles produced, is fitted at 69, 205 and 303 GeV/c. The two-component model used for the charged multiplicity distributionPn, is one which envisages two distinct types of collisions and is the simplest such model consistent with charge conservation. We find that the data on$$\bar N_0 \left( {n\_} \right)$$ can be fitted reasonably well. Further, our results, based on this model forPn, suggest that at 50 GeV/c,$$\bar N_0 \left( {n\_} \right)$$ should increase linearly withnand that neutral-negative correlations should be present in the central component.

    • Energy dependence of multiplicity in proton-nucleus collisions and models of multiparticle production

      A Gurtu P K Malhotra I S Mittra P M Sood SC Gupta VK Gupta GL Kaul LK Mangotra Y Prakash NK Rao ML Sharma

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      This is a continuation of our earlier investigation (Gurtuet al 1974Phys. Lett.50 B 391) on multiparticle production in proton-nucleus collisions based on an exposure of emulsion stack to 200 GeV/c beam at the NAL. It is found that the ratioRem = 〈ns〉/〈nch〉, where 〈nch〉 is the charged particle multiplicity in pp-collisions, increases slowly from about 1 at 10 GeV/c to 1·6 at 68 GeV/c and attains a constant value of 1·71 ± 0·04 in the region 200 to 8000 GeV/c. Furthermore,Rem = 1·71 implies an effectiveA-dependence ofRA =A0.18,i.e., a very weak dependence. Predictions ofRem on various models are discussed and compared with the emulsion data. Data seem to favour models of hadron-nucleon collisions in which production of particles takes place through adouble step mechanism,e.g., diffractive excitation, hydrodynamical and energy flux cascade as opposed to models which envisage instantaneous production.

    • Charge transfer inpp collisions according to a mixed two component model

      V Gupta P K Malhotra D S Narayan

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      The charge transfer from one hemisphere to the other, observed inpp-collisions is explained on the basis of a ‘mixed two component’ model, which has been proposed previously to account for the multiplicity distribution of charged particles. Results of the calculations, based on the model, for various measurable quantities relating to charge transfer are compared with the available experimental data.

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