Void pattern fluctuation in p-AgBr interactions at 400 GeV/c

The event-by-event fluctuation of hadronic patterns is investigated by finding a measure of the non-hadronic regions, the voids, for the experimental data of p-AgBr interactions at 400 GeV/c considering the anisotropy of phase space. Two moments of the event-to-event fluctuation of voids, <Gq> and Sq have been calculated as defined by R. C. Hwa and Q. H. Zhang to quantify the dependence of the voids on the bin sizes. The results suggest that no quark-hadron phase transition of second order have taken place for p-AgBr interactions at 400 GeV/c. The result have been compared with the result of VENUS generated data

Ovisnost korelacijskog koeficijenta o veličini intervala faznog prostora u visoko-energijskim međudjelovanjima

We calculated the cumulant moments in order to find the genuine two-particle short-range correlations among the produced pions and also the correlation coefficients in order to quantify the correlations. We studied the cumulant moments and their variation with the pseudorapidity phase-space interval for nucleus-nucleus interactions (24Mg-AgBr at 4.5A GeV and 28Si-AgBr at 14.5A GeV), hadron nucleus interactions (p-AgBr at 800 GeV) and hadron-hadron collisions (p¯p at √ s = 200 GeV and √ s = 900 GeV). The analysis reveals the presence of genuine two-particle short-range correlations among the produced pions in the multi-particle production processes. It is found that the cumulant moments decrease with the increase of the width of the rapidity phase-space intervals. The decrease of cumulant moments with the increase of phase-space interval signifies that the short-range correlation decreases. We investigated the variation of the correlation coefficients in order to study the correlation effects in some more detail in the above mentioned interactions. The nature of variations of the correlation coefficients with the phase-space interval size is different for different types of interactions.Izračunali smo kumulacijske momente radi nalaženja pravih dvočestičnih kratkodosežnih korelacija među proizvedenim pionima te korelacijske koeficijente radi utvrđivanja njihovih iznosa. Proučavamo korelacijske momente i njihove promjene sa širinom intervala pseudorapiditeta u faznom prostoru za međudjelovanja jezgra-jezgra (24Mg-AgBr na 4.5A GeV i 28Si-AgBr na 14.5A GeV), hadronjezgra (p-AgBr na 800 GeV), te u sudarima hadrona (p¯p na √ s = 200 GeV i √ s = 900 GeV). Analize pokazuju prisutnost pravih dvočestičnih kratko-dosežnih korelacija među pionima proizvedenim u mnogočestičnoj tvorbi. Nalazimo smanjenje kumulacijskih momenata s povećanjem širine intervala fazno-prostornog rapiditeta. Pad kumulacijskih momenata s povećanjem fazno-prostornog intervala znači da se smanjuju kratkodosežne korelacije. Također smo istraživali promjene korelacijskih koeficijenata radi podrobnijeg poznavanja korelacijskih efekata u navedenim međudjelovanjima. Narav promjena korelacijskih koeficijenata s veličinom fazno-prostornog intervala različita je u tim međudjelovanjima

Odstupanja raspodjele dijelova mete u sudarima miona s jezgrama na (420 ± 45) GeV

This paper presents an analysis of angular distribution of target fragments in lepton nucleus interactions in terms of scaled factorial moments (SFMs) in one-dimensional space. A power-law type behaviour of normalised scaled factorial moments, popularly known as \u27intermittency\u27, is expressed with a decreasing phase space. Our data of target fragments reveal a similar type of increase in SFMs with decreasing bin width of the angular distribution in muon-nucleus interactions at (420±45) GeV. The new observation contradicts the existing concept of the evaporation model that the statistical equilibrium is reached before the emission of fragmented particles from residual target nuclei at high-energy nuclear interactions.Predstavljamo analizu kutne raspodjele dijelova mete u sudarima leptona s jezgrama pomoću sukladnih faktorijalnih momenata (SFM) u jednodimenzijskom prostoru. Sa smanjenjem faznog prostora dolazi do izražaja potencijalna ovisnost normaliziranih sukladnih faktorijalnih momenata, koja se obično naziva “odstupanjem raspodjele” (intermittency). Naši podaci za dijelove mete pokazuju slično povećanje SFM-ova kada se smanjuju intervali kutne raspodjele sudara mion–jezgra na (420±45) GeV. Ova su opažnja suprotna prevladavajućoj zamisli modela isparavanja prema kojoj se statistička ravnoteža postiže prije emisije otkinutih dijelova mete u sudarima na visokim energijama

Odstupanja raspodjele dijelova mete u sudarima miona s jezgrama na (420 ± 45) GeV

This paper presents an analysis of angular distribution of target fragments in lepton nucleus interactions in terms of scaled factorial moments (SFMs) in one-dimensional space. A power-law type behaviour of normalised scaled factorial moments, popularly known as \u27intermittency\u27, is expressed with a decreasing phase space. Our data of target fragments reveal a similar type of increase in SFMs with decreasing bin width of the angular distribution in muon-nucleus interactions at (420±45) GeV. The new observation contradicts the existing concept of the evaporation model that the statistical equilibrium is reached before the emission of fragmented particles from residual target nuclei at high-energy nuclear interactions.Predstavljamo analizu kutne raspodjele dijelova mete u sudarima leptona s jezgrama pomoću sukladnih faktorijalnih momenata (SFM) u jednodimenzijskom prostoru. Sa smanjenjem faznog prostora dolazi do izražaja potencijalna ovisnost normaliziranih sukladnih faktorijalnih momenata, koja se obično naziva “odstupanjem raspodjele” (intermittency). Naši podaci za dijelove mete pokazuju slično povećanje SFM-ova kada se smanjuju intervali kutne raspodjele sudara mion–jezgra na (420±45) GeV. Ova su opažnja suprotna prevladavajućoj zamisli modela isparavanja prema kojoj se statistička ravnoteža postiže prije emisije otkinutih dijelova mete u sudarima na visokim energijama

Analiza maksimalnih procijepa pseudorapiditeta u nuklearnim sudarima na par do nekoliko stotina gev

This paper presents new results on the maximum gap (∆max) in the pseudorapidity distribution of charged particles in individual events in 24Mg-AgBr, 16O-AgBr and 32S-AgBr interaction in the energy range 4.5 − 200 AGeV. The location of the ∆max in an event and the experimental ∆max distribution at all energies has been studied in details. It has been observed that Gaussian distribution can describe the experimental data satisfactorily over the entire energy range.Predstavljamo nove ishode mjerenja maksimalnih procijepa (∆_max) u raspodjeli pseudorapiditeta nabijenih čestica u pojedinačnim sudarima 24Mg-AgBr, 16O-AgBr i 32S-AgBr na energijama 4.5−200 AGeV. Podrobno smo odredili položaje (∆_max) za pojedine sudare i proučili njihovu eksperimentalnu raspodjelu na tim energijama. Opažamo da Gaussova raspodjela može dobro opisati eksperimentalne podatke u cijelom području energija