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Title: Measurement of the atmospheric muon charge ratio at TeV energies with MINOS

Abstract

The 5.4 kton MINOS far detector has been taking charge-separated cosmic ray muon data since the beginning of August, 2003 at a depth of 2070 m.w.e. in the Soudan Underground Laboratory, Minnesota, USA. The data with both forward and reversed magnetic field running configurations were combined to minimize systematic errors in the determination of the underground muon charge ratio. When averaged, two independent analyses find the charge ratio underground to be N{sub {mu}}+/N{sub {mu}}-=1.374{+-}0.004(stat)-0.010{sup +0.012}(sys). Using the map of the Soudan rock overburden, the muon momenta as measured underground were projected to the corresponding values at the surface in the energy range 1-7 TeV. Within this range of energies at the surface, the MINOS data are consistent with the charge ratio being energy independent at the 2 standard deviation level. When the MINOS results are compared with measurements at lower energies, a clear rise in the charge ratio in the energy range 0.3-1.0 TeV is apparent. A qualitative model shows that the rise is consistent with an increasing contribution of kaon decays to the muon charge ratio.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
917102
Report Number(s):
FERMILAB-PUB-07-134-E
Journal ID: ISSN 0022-3727; JPAPBE; arXiv eprint number arXiv:0705.3815; TRN: US0804451
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.D76:052003,2007; Journal Volume: 76
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ENERGY RANGE; KAONS; MAGNETIC FIELDS; MINUS-PLUS RATIO; MUONS; OVERBURDEN; Experiment-HEP

Citation Formats

Adamson, P., Andreopoulos, C., Arms, K.E., Armstrong, R., Auty, D.J., Avvakumov, S., Ayres, D.S., Baller, B., Barish, B., Barnes, P.D., Jr., Barr, G., and /Fermilab /University Coll. London /Rutherford /Minnesota U. /Indiana U. /Sussex U. /Stanford U., Phys. Dept. /Argonne /Caltech /LLNL, Livermore /Oxford U.. Measurement of the atmospheric muon charge ratio at TeV energies with MINOS. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.052003.
Adamson, P., Andreopoulos, C., Arms, K.E., Armstrong, R., Auty, D.J., Avvakumov, S., Ayres, D.S., Baller, B., Barish, B., Barnes, P.D., Jr., Barr, G., & /Fermilab /University Coll. London /Rutherford /Minnesota U. /Indiana U. /Sussex U. /Stanford U., Phys. Dept. /Argonne /Caltech /LLNL, Livermore /Oxford U.. Measurement of the atmospheric muon charge ratio at TeV energies with MINOS. United States. doi:10.1103/PhysRevD.76.052003.
Adamson, P., Andreopoulos, C., Arms, K.E., Armstrong, R., Auty, D.J., Avvakumov, S., Ayres, D.S., Baller, B., Barish, B., Barnes, P.D., Jr., Barr, G., and /Fermilab /University Coll. London /Rutherford /Minnesota U. /Indiana U. /Sussex U. /Stanford U., Phys. Dept. /Argonne /Caltech /LLNL, Livermore /Oxford U.. Tue . "Measurement of the atmospheric muon charge ratio at TeV energies with MINOS". United States. doi:10.1103/PhysRevD.76.052003. https://www.osti.gov/servlets/purl/917102.
@article{osti_917102,
title = {Measurement of the atmospheric muon charge ratio at TeV energies with MINOS},
author = {Adamson, P. and Andreopoulos, C. and Arms, K.E. and Armstrong, R. and Auty, D.J. and Avvakumov, S. and Ayres, D.S. and Baller, B. and Barish, B. and Barnes, P.D., Jr. and Barr, G. and /Fermilab /University Coll. London /Rutherford /Minnesota U. /Indiana U. /Sussex U. /Stanford U., Phys. Dept. /Argonne /Caltech /LLNL, Livermore /Oxford U.},
abstractNote = {The 5.4 kton MINOS far detector has been taking charge-separated cosmic ray muon data since the beginning of August, 2003 at a depth of 2070 m.w.e. in the Soudan Underground Laboratory, Minnesota, USA. The data with both forward and reversed magnetic field running configurations were combined to minimize systematic errors in the determination of the underground muon charge ratio. When averaged, two independent analyses find the charge ratio underground to be N{sub {mu}}+/N{sub {mu}}-=1.374{+-}0.004(stat)-0.010{sup +0.012}(sys). Using the map of the Soudan rock overburden, the muon momenta as measured underground were projected to the corresponding values at the surface in the energy range 1-7 TeV. Within this range of energies at the surface, the MINOS data are consistent with the charge ratio being energy independent at the 2 standard deviation level. When the MINOS results are compared with measurements at lower energies, a clear rise in the charge ratio in the energy range 0.3-1.0 TeV is apparent. A qualitative model shows that the rise is consistent with an increasing contribution of kaon decays to the muon charge ratio.},
doi = {10.1103/PhysRevD.76.052003},
journal = {Phys.Rev.D76:052003,2007},
number = ,
volume = 76,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}