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SUMMARY:Possible effect of mixed phase and deconfinement upon spin correla
tions in the $\\Lambda \\bar{\\Lambda}$ pairs generated in relativistic he
avy-ion collisions
DTSTART;VALUE=DATE-TIME:20180911T153000Z
DTEND;VALUE=DATE-TIME:20180911T155500Z
DTSTAMP;VALUE=DATE-TIME:20201128T092219Z
UID:indico-contribution-14378@agenda.infn.it
DESCRIPTION:Speakers: Valery Lyuboshitz (Joint Institute for Nuclear Resea
rch ( Dubna ))\nSpin correlations for the $\\Lambda \\Lambda$ and\n$\\Lam
bda \\bar{\\Lambda}$ pairs\, generated in relativistic\nheavy-ion collisio
ns\, and related angular correlations at the\njoint registration of space-
parity nonconserving hadronic decays\n of two hyperons are theoretically a
nalyzed. \nThese correlations give important information about the charact
er \nand mechanism of multiple processes\, and the advantage of the\n$\\La
mbda \\Lambda$ and $\\Lambda \\bar{\\Lambda}$ systems over\nother ones is
due to the fact that the $P$-odd decays\n$\\Lambda \\rightarrow p + \\pi^
-$ and \n$\\bar{\\Lambda} \\rightarrow \\bar{p} + \\pi^+$ serve as effecti
ve \nanalyzers of spin state of the $\\Lambda$ and $\\bar{\\Lambda}$\npart
icles -- thus\, the respective spin correlations \ncan be rather easily di
stinguished and studied experimentally\,\nwhich is especially meaningful f
or the investigations of multiple generation at modern and future ion coll
iders like RHIC\, LHC and\nNICA . The correlation tensor components can be
derived by the\nmethod of "moments" -- as a result of averaging the combi
nations\nof trigonometric functions of proton ( antiproton ) flight angles
\nover the double angular distribution of flight directions for\nproducts
of two decays. The properties of the "trace" of the\n correlation tensor (
a sum of three diagonal components )\,\n determining the angular correlat
ions as well as the relative \nfractions of the triplet states and singlet
state of\nrespective pairs\, are discussed. \n\n In this talk\, spin corr
elations for two identical particles\n($\\Lambda \\Lambda$) and two non-id
entical particles ($\\Lambda \\bar{\\Lambda}$) are generally considered fr
om the viewpoint of the conventional model of one-particle sources\, which
implies that correlations vanish at enough large relative momenta. Howeve
r\,\nunder these conditions ( especially at ultrarelativistic energies )\,
\n in the case of two non-identical particles ($\\Lambda \\bar{\\Lambda}$)
\nthe two-particle annihilation sources -- quark-antiquark and \ntwo-gluon
ones -- start playing a noticeable role and lead to the difference of the
correlation tensor from zero. In particular\, \nsuch a situation may aris
e\, when the system\npasses through the "mixed phase" and -- due to the mu
ltiple\nproduction of free quarks and gluons in the process of deconfineme
nt\nof hadronic matter -- the number of two-particle sources strongly\ninc
reases.\n\nhttps://agenda.infn.it/event/12464/contributions/14378/
LOCATION:Polo degli Adelardi - Via Adelardi\, 33 A8
URL:https://agenda.infn.it/event/12464/contributions/14378/
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