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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4572
DTSTART:20170825T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T003741Z
LAST-MODIFIED:20170823T170852Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Cosmic rays\, anti-helium\, and an old navy spotlight\, NPAC (
 Nuclear/Particle/Astro/Cosmo) Forum\, Kfir Blum\, Weizmann Institute o
 f Sciences
DESCRIPTION:Cosmic-ray anti-deuterium and anti-helium have long been s
 uggested as probes of dark matter\, as their secondary astrophysical p
 roduction was thought extremely scarce. But how does one actually  pre
 dict the secondary flux? Anti-nuclei are dominantly produced in pp col
 lisions\, where laboratory  cross section data is lacking. We make a n
 ew attempt at tackling this problem by appealing to a scaling law of n
 uclear coalescence with the physical volume of the hadronic emission r
 egion. The same volume is probed by Hanbury Brown-Twiss (HBT) two-part
 icle correlations. We demonstrate the consistency of the scaling law w
 ith systems ranging from central and off-axis AA collisions to pA coll
 isions\, spanning 3 orders of magnitude in coalescence yield. Extendin
 g the volume scaling to the pp system\, HBT data allows us to make a n
 ew estimate of coalescence\, that we test against preliminary ALICE pp
  data. For anti-helium the resulting cross section is 1-2 orders of ma
 gnitude higher than earlier estimates. The astrophysical secondary flu
 x of anti-helium could be within reach of a five-year exposure of AMS0
 2.
URL:https://www.physics.wisc.edu/events/?id=4572
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