English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A recent study of 5 TeV $p$-Pb centrality combined a Glauber model of $p$-Pbcollision geometry with an assumption of linear scaling between $n_{ch}$(charge) integrated within some $\eta$ acceptance and the number of nucleonparticipants $N_{part}$. The study concluded that $N_{part}$ increases tonearly 16 in central collisions, and the high-$p_t$ region of $p$-Pb $p_t$spectra rescaled by the Glauber-estimated number of $p$-N binary collisionsremains consistent with a $p$-$p$ spectrum for the same energy, independent of$p$-Pb centrality. However, the relation between $N_{part}$ and $n_{ch}$derived from a two-component (soft + hard) model (TCM) study of ensemble-mean$\bar p_t$ data for the same system is quite different. This article reports adetailed analysis of the Glauber study and the question of centrality in $p$-Acollisions. The Glauber centrality model is compared with the $\bar p_t$ TCM tounderstand the sources of major differences. The assumption of linearproportionality between $n_{ch}$ and $N_{part}$ is found to be inconsistentwith $\bar p_t$ data. Properties of the convolution integral relating adifferential cross section and hadron production model to an event distributionon $n_{ch}$ are examined. An alternative differential-cross-sectiondistribution is inferred from charge-multiplicity data, and the upper limit on$N_{part}$ is estimated to be near 8. The TCM centrality model is then appliedto $p_t$ spectrum ratios to predict results for $p$-Pb spectra. The spectrumTCM is tested with identified-pion spectra from 5 TeV $p$-Pb collisions and theresult is consistent with previous $p$-$p$ TCM results. A TCM prediction thatthe spectrum ratio at high $p_t$ should increase to 14 for central $p$-Pbcollisions due to quadratic dependence of dijet production on $n_{ch}$ isconsistent with $\bar p_t$ data from the same system.

Glauber-model analysis of 5 TeV $\bf p$-Pb centrality compared to a  two-component (soft + hard) model of hadron production in high-energy nuclear  collisions