Measurement of the TeV atmospheric muon charge ratio with the complete OPERA data set

Ereditato, Antonio; Ariga, Akitaka; Ariga, Tomoko; Kawada, Jiro; Kreslo, Igor; Pistillo, Ciro; Tufanli, Serhan; Vuilleumier, Jean-Luc (2014). Measurement of the TeV atmospheric muon charge ratio with the complete OPERA data set. European physical journal. C - particles and fields, C74(7), p. 2933. EDP Sciences 10.1140/epjc/s10052-014-2933-0

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The OPERA detector, designed to search for νμ → ντ oscillations in the CNGS beam, is located in the underground Gran Sasso laboratory, a privileged location to study TeV-scale cosmic rays. For the analysis here presented, the detector was used to measure the atmospheric muon charge ratio in the TeV region. OPERA collected chargeseparated cosmic ray data between 2008 and 2012. More than 3 million atmospheric muon events were detected and reconstructed, among which about 110000 multiple muon bundles. The charge ratio Rμ ≡ Nμ+/Nμ− was measured separately for single and for multiple muon events. The analysis exploited the inversion of the magnet polarity which was performed on purpose during the 2012 Run. The combination of the two data sets with opposite magnet polarities allowedminimizing systematic uncertainties and reaching an accurate determination of the muon charge ratio. Data were fitted to obtain relevant parameters on the composition of primary cosmic rays and the associated kaon production in the forward fragmentation region. In the surface energy range 1–20 TeV investigated by OPERA, Rμ is well described by a parametric model including only pion and kaon contributions to themuon flux, showing no significant contribution of the prompt component. The energy independence supports the validity of Feynman scaling in the fragmentation region up to 200 TeV/nucleon primary energy.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Ereditato, Antonio; Ariga, Akitaka; Ariga, Tomoko; Kawada, Jiro; Kreslo, Igor; Pistillo, Ciro; Tufanli, Serhan and Vuilleumier, Jean-Luc

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Jan Dirk Brinksma

Date Deposited:

01 Jun 2015 16:39

Last Modified:

01 Jun 2015 16:39

Publisher DOI:

10.1140/epjc/s10052-014-2933-0

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.68742

URI:

https://boris.unibe.ch/id/eprint/68742

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