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

Methods to classify events experimentally according to collision geometry arewell established and non-controversial when collisions of large ions arestudied. However, high luminosity data from $p/d$+A collisions at RHIC and LHCprovided some surprising results that either call for new physics or questionthe applicability of the established methods of event classification for them.So far there is no consensus in the community what is the proper model andprocedure to determine centrality, how to connect observed event activity withcollision geometry in very asymmetric, $p/d$+A collisions in the same sense andwith the same accuracy as was done in A+A. We argue that high $p_T$ directphotons offer an {\it a posteriori} test of any method suggested to categorize$p/d$+A -- and in general, very asymmetric -- collisions: the method is onlyviable if the nuclear modification factor for high $p_T$ direct photons isabout unity for all centrality classes.

Centrality Issues In Asymmetric Collisions: Direct Photons To The Rescue?