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SUMMARY:Connecting fluctuation measurements in heavy ion collisions and gr
 and canonical susceptibilities: global conservation effects
DTSTART;VALUE=DATE-TIME:20201221T085000Z
DTEND;VALUE=DATE-TIME:20201221T091000Z
DTSTAMP;VALUE=DATE-TIME:20260518T022104Z
UID:indico-contribution-172@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Roman Poberezhnyuk (Bogolyubov Institute for Theoret
 ical Physics of the National Academy of Sciences of Ukraine)\nWe present t
 he relation between cumulants of a conserved charge measured in a subvolum
 e of a thermal system and the corresponding grand-canonical susceptibiliti
 es\, taking into account exact global conservation of all QCD charges. The
  derivation is presented for an arbitrary equation of state\, with the ass
 umption that the subvolume is sufficiently large to be close to the thermo
 dynamic limit. Our framework – the subensemble acceptance method (SAM) 
 – quantifies the effect of global conservation laws and is an important 
 step toward a direct comparison between cumulants of conserved charges mea
 sured in central heavy ion collisions and theoretical calculations of gran
 d-canonical susceptibilities\, such as lattice QCD. We show that the globa
 l conservation effects cancel out in any ratio of two second order cumulan
 ts\, in any ratio of two third order cumulants\, as well as in a ratio of 
 strongly intensive measures Σ and ∆ involving any two conserved charges
 \, making all these quantities particularly suitable for theory-to-experim
 ent comparisons in heavy-ion collisions. We also show that the same cancel
 lation occurs in correlators of a conserved charge\, like the electric cha
 rge\, with any non-conserved quantity such as net proton or net kaon numbe
 r. The main results of the SAM are illustrated in the framework of the had
 ron resonance gas model. We also elucidate how net-proton and net-Λ fluct
 uations are affected by conservation of electric charge and strangeness in
  addition to baryon number.\n\nhttps://indico.bitp.kiev.ua/event/7/contrib
 utions/172/
LOCATION:Online meeting
URL:https://indico.bitp.kiev.ua/event/7/contributions/172/
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