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SUMMARY:Investigation of exclusive final states with two neutral pions in 
 COMPASS 2009 hadron beam data
DTSTART:20260625T123000Z
DTEND:20260625T133000Z
DTSTAMP:20260706T073000Z
UID:indico-event-8031@indico.ph.tum.de
DESCRIPTION:Speakers: Bastian Kugler (TUM)\n\nTo study the low-energy regi
 me of the strong interaction\, Chiral Perturbation Theory can be used. One
  of the predictions of the chiral anomaly and $\\chi$PT is the $\\gamma\\p
 i \\rightarrow \\pi\\pi$ amplitude at low interaction energies\, described
  by the $F_{3\\pi}$ coupling constant. In the COMPASS experiment at CERN\,
  this is done via the Primakoff method. In this analysis\, we take a look 
 at interactions of the form $\\pi^-(\\pi^+)^* \\rightarrow \\pi^0\\pi^0$ t
 o find kinematic distributions to estimate the $\\pi^-(\\pi^0)^* \\rightar
 row \\pi^-\\pi^0$ background of the anomalous process $\\pi^- \\gamma^{(*)
 }\\rightarrow \\pi^-\\pi^0$ under investigation at COMPASS. Here we find s
 trong evidence of charged-pion exchange. Furthermore\, we find evidence fo
 r an intermediate state containing a $f_2(1270)$\, $K^0_S$\, and $f_0(500)
 $. We further examine the angle and momentum-transfer distributions for th
 e different mass regions of the intermediate states.\n\nhttps://indico.ph.
 tum.de/event/8031/
LOCATION:E18/ENE Seminar Room 3268 (TUM PH)
URL:https://indico.ph.tum.de/event/8031/
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