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SUMMARY:Overview of a baryon-antibaryon pair production from electron-posi
 tron annihilation
DTSTART;VALUE=DATE-TIME:20190228T105000Z
DTEND;VALUE=DATE-TIME:20190228T111000Z
DTSTAMP;VALUE=DATE-TIME:20260808T225530Z
UID:indico-contribution-601@indico.inp.nsk.su
DESCRIPTION:Speakers: Andrzej Kupsc (Uppsala University)\nThe well-defined
  and simple\, initial state makes a baryon-antibaryon\npair production at 
 an electron-positron collider a perfect system to\ntest discrete symmetrie
 s in the baryon sector and to study baryon\nproperties.  In particular the
  production yields are much enhanced\nat  the vector resonances such as J/
 psi and psi'.  The spin\norientations of the baryon and antibaryon are cor
 related and\, for spin\none-half baryons\, the pair is produced either wit
 h parallel or\nantiparallel helicites. The transitions to the respective h
 elicity states\ncan acquire a relative phase\, due to the strong interacti
 on in the\nfinal state\, leading to a time-reversal-odd observable: a tran
 sverse\nspin polarization of the baryons.  The polarization could be\ndete
 rmined for hyperons using their weak decays. This effect was\nrecently obs
 erved\nat BESIII in the J/psi->Lambda_bar Lambda process.\nThe polarizatio
 n in baryon-antibaryon exclusive processes\nallows novel type of experimen
 ts such as simultaneous determination of\nthe Lambda and Lambda_bar decay\
 nasymmetries.  In the talk the method will be described and the prospects\
 nfor the studies of\nweak decays of hyperons and for CP tests in baryon se
 ctor will be\ndiscussed.\n\nhttps://indico.inp.nsk.su/event/15/contributio
 ns/601/
LOCATION: Conference room
URL:https://indico.inp.nsk.su/event/15/contributions/601/
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