R. Nania

The leading effect explains the charged-particle multiplicity distributions observed at the cern pp collider

SummaryThe assumption that the leading effect, and the charged-particle multiplicity distributions, measured at the ISR, scale with energy, and that the mean charged multiplicity, measured at the ISR, can be extrapolated up to Collider energy using the leading subtraction method, allows a prediction of the charged multiplicity distribution at the CERN pp Collider. This prediction is found to be in excellent agreement with the experimental data obtained at the Collider by the UA5 group.

Universality Features in (pp), (e+e−), and Deep Inelastic Scattering Processes

SummaryThe use of the correct variables in (pp), (e+e−), and deep-inelastic scattering (DIS) processes allows universality features to be established in these—so far considered—different ways of producing multihadronic states.RiassuntoLuso delle variabili corrette, nei processi (pp), (e+e−) e scattering inelastico profondo (DIS), permette di mettere in evidenza lesistenza di caratteristiche universali in tali interazioni, considerate sinora modi molto differenti di produrre stati multiadronici.РезюмеИспользование правильных переменных в (p, p), (e+e−) и процессах глубоко неупругого рассеяния позволяет установить универсальные особенности в этих реаксиях.

Measurement of forward and backward mean charged-particle multiplicities in high-energy (pp) soft interactions and comparison with high-energy neutrino and antineutrino deep inelastic scattering

SummaryThe difference between forward and backward mean charged-particle multiplicities is shown to exist also in (pp) interactions, when these are analysed in analogy with the deep inelastic scattering method. The measurements reported here show that this difference, which has been observed for a long time in (vp) and (vp) deep inelastic scattering experiments, is explained in terms of the omitted correction for the leading effect in the backward hemisphere.

Scaling in the charged-particle multiplicity distributions at the ISR and comparison with (e+e-) data

SummaryThe distribution of the charged-particle multiplicities at the ISR are studied in terms of the effective energy available for particle production in (pp) interactions. These distributions are found to scale once the effective energy, obtained via the leading subtraction method, is used. A comparison with the charged particle distributions measured in (e+e-) annihilation shows a clear difference. This could be interpreted in terms of gluon-induced and quark-induced jets; where the gluoninduced jets are characterized by a wider multiplicity distribution with respect to quarkinduced jets.

The End of A Myth: High-pT Physics

So far, the main picture of hadronic physics has been based on a distinction between high-pT and low-pT phenomena.

SUD: an advanced set-up descriptor for complex multi-TeV experiments

SummaryWe have defined a new Entity-Relationship (ER) database, called SUD (Set-Up Descriptor), which contains all the information needed to describe any kind of High Energy Physics apparatus for Monte Carlo simulation and real data analysis. SUD has been implemented using the ADAMO database management system. Different programs can access the data and their mutual relationships in a user-friendly way, via standard FORTRAN calls. As an example of application, the database has been interfaced with the GEANT tracking program.

Heavy Flavour Production in Hadron-Hadron Collisions

Open charm production in hadron-hadron interactions has already been extensively studied and reported by several authors1-5. Recently, also the first open beauty state has been identified as the ⋀ baryon, in the experiment R415 performed at the CERN Intersecting Storage Rings (ISR)6, where charmed-particle production distribution has also been widely studied7-11.

New Flavours: How They can be Looked for at the (p̄) Collider with the Lepton Asymmetry Analyser

Our knowledge on the basic structure of matter appears at present to be in terms of quarks and leptons. They can be classified as “uplike” and “downlike” states according to their electric charge, which is fractional for quarks and integer for leptons.

High-Energy Soft (pp) Interactions Compared with (e + e − ) and Deep-Inelastic Scattering

Last year I presented the first set of data1 obtained with a new way of studying high-energy, but soft (i.e. low-pт), interactions between two protons. The study was performed at the CERN ISR using protons with different nominal total centre-of-mass energies, )pp i.e.

A detailed study of vs. Ehad andm1,2 at different\(\left( {\sqrt 8 } \right)_{pp} \) in (pp) interactionsin (pp) interactions

By using (pp) interactions at three different c.m. energies,(left( {sqrt 8 } right)_{pp} )=30, 44, 62 GeV, it is shown that the average charged-particle multiplicity vs. the invariant mass of the hadronic systemm1,2 has the same behaviour as it hasvs. 2Ehad. Moreover, in both cases is shown to be nearly independent of(left( {sqrt 8 } right)_{pp} ) and in good agreement with the average charged-particle multiplicity measured in the (e+e−) annihilation.SummaryBy using (pp) interactions at three different c.m. energies,n% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfKttLearuqr1ngBPrgarmqr1ngBPrgitL% xBI9gBamXvP5wqSXMqHnxAJn0BKvguHDwzZbqegm0B1jxALjhiov2D% aeHbuLwBLnhiov2DGi1BTfMBaebbfv3ySLgzGueE0jxyaibaiyc9qr% pepeeu0dXdh9vqqj-hEeeu0xXdbba9frFj0-OqFfea0dXdc9LqpGe9% FjuP0-is0dXdbba9pGe9xq-Jbba9suk9fr-xfr-xfrpeWZqaaeaabi% GaciaacaqabeaadaabauaaaOqaamaabmaabaWaaOaaaeaacqaI4aao% aSqabaaakiaawIcacaGLPaaadaWgaaWcbaacbaGae8hCaaNae8hCaa% habeaaaaa!482A!nn