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SUMMARY:Explanation of the seasonal variation of cosmic multiple muon even
 ts observed with the NOvA Near Detector
DTSTART:20260427T124500Z
DTEND:20260427T130000Z
DTSTAMP:20260509T024800Z
UID:indico-event-1805@indico.dfa.unipd.it
DESCRIPTION:Speakers: Jingchao Liang (Università degli Studi di Padova)\n
 \nThe flux of cosmic ray muons at the Earth's surface exhibits seasonal va
 riations due to changes in the temperature of the atmosphere affecting the
  production and decay of mesons in the upper atmosphere. Using 1473 live d
 ays of data collected by the NuMI Off-axis νe Appearance (NOvA) Near Dete
 ctor during 2018─2022\, we studied the seasonal pattern in the multiple-
 muon event rate. The data confirm an anticorrelation between the multiple-
 muon event rate and effective atmospheric temperature\, consistent across 
 all the years of data. Previous analyses from MINOS and NOvA saw a similar
  anticorrelation but did not include an explanation. We find that this ant
 icorrelation is driven by altitude─geometry effects as the average muon 
 production height changes with the season. This has been studied with a CO
 RSIKA cosmic ray simulation package by varying atmospheric parameters\, an
 d provides an explanation to a longstanding discrepancy between the season
 al phases of single and multiple-muon events.\n\n\nhttps://indico.dfa.unip
 d.it/event/1805/
LOCATION:Aula Rosino (Dipartimento di Fisica e Astronomia - Edificio ex-Ri
 zzato)
URL:https://indico.dfa.unipd.it/event/1805/
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