The OPERA detector at the Gran Sasso underground laboratory (LNGS) was used to measure the atmospheric muon charge ratio Rμ =Nμ+/Nμ− in the TeV energyregion.Weanalyzed403069atmosphericmuonscorrespondingto 113.4 days of livetimeduring the2008 CNGS run. We computed separately the muon charge ratio for single and for multiple muon events in order to select different energy regions of the primary cosmic ray spectrum and to test the Rμ dependence on the primary composition. The measured Rμ values were corrected taking into account the charge-misidentiﬁcation errors. Data have also been grouped in ﬁve bins of the “vertical surface energy” Eμ cosθ. A ﬁt to a simpliﬁed model of muon production in the atmosphere allowed the determination of the pion and kaon charge ratios weighted by the cosmic ray energy spectrum.
|Titolo:||Measurement of the atmospheric muon charge ratio with the OPERA detector|
|Autori interni:||BOZZA, Cristiano|
|Data di pubblicazione:||2010|
|Rivista:||THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|