Phys. Rev. D
60,
112001
(1999)
[7 pages]
Upper limit on the prompt muon flux derived from the LVD underground experiment
M. Aglietta et al. (The LVD Collaboration)
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M. Aglietta16, B. Alpat13, E. D. Alyea7, P. Antonioli1, G. Badino16, G. Bari1, M. Basile1, V. S. Berezinsky10, F. Bersani1, M. Bertaina16, R. Bertoni16, G. Bonoli1, A. Bosco2, G. Bruni1, G. Cara Romeo1, C. Castagnoli16, A. Castellina16, A. Chiavassa16, J. A. Chinellato3, L. Cifarelli1,*, F. Cindolo1, G. Conforto17, A. Contin1, V. L. Dadykin10, A. De Silva2, M. Deutsch8, P. Dominici17, L. G. Dos Santos3, L. Emaldi1, R. I. Enikeev10, F. L. Fabbri4, W. Fulgione16, P. Galeotti16, C. Ghetti1, P. Ghia16, P. Giusti1, R. Granella16, F. Grianti1, G. Guidi17, E. S. Hafen8, P. Haridas8, G. Iacobucci1, N. Inoue14, E. Kemp3, F. F. Khalchukov10, E. V. Korolkova10, P. V. Korchaguin10, V. B. Korchaguin10, V. A. Kudryavtsev10,†, K. Lau6, M. Luvisetto1, G. Maccarone4, A. S. Malguin10, R. Mantovani17, T. Massam1, B. Mayes6, A. Megna17, C. Melagrana16, N. Mengotti Silva3, C. Morello16, J. Moromisato9, R. Nania1, G. Navarra16, L. Panaro16, L. Periale16, A. Pesci1, P. Picchi16, L. Pinsky6, I. A. Pless8, J. Pyrlik6, V. G. Ryasny10, O. G. Ryazhskaya10, O. Saavedra16, K. Saitoh15, S. Santini17, G. Sartorelli1, M. Selvi1, N. Taborgna5, V. P. Talochkin10, J. Tang8, G. C. Trinchero16, S. Tsuji11, A. Turtelli3, I. Uman13, P. Vallania16, G. Van Buren8, S. Vernetto16, F. Vetrano17, C. Vigorito16, E. von Goeler9, L. Votano4, T. Wada11, R. Weinstein6, M. Widgoff2, V. F. Yakushev10, I. Yamamoto12, G. T. Zatsepin10, and A. Zichichi1 (The LVD Collaboration)
1University of Bologna and INFN-Bologna, Bologna, Italy 40126
2Brown University, Providence, Rhode Island 02912
3University of Campinas, Campinas, Brazil 13081
4INFN-LNF, Frascati, Italy 00044
5INFN-LNGS, Assergi, Italy 67010
6University of Houston, Houston, Texas 77004
7Indiana University, Bloomington, Indiana 47405
8Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
9Northeastern University, Boston, Massachusetts 02115
10Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia 117312
11Okayama University, Okayama, Japan 700-85301
12Okayama University of Science, Okayama, Japan 700-85301
13University of Perugia and INFN-Perugia, Perugia, Italy 06100
14Saitama University, Saitama, Japan 338-8570
15Ashikaga Institute of Technology, Ashikaga, Japan
16Institute of Cosmo-Geophysics, CNR, Torino, University of Torino and INFN-Torino, Turin, Italy 10100
17University of Urbino and INFN-Firenze, Urbino, Italy 61029
Received 3 June 1998; revised 16 March 1999; published 5 November 1999
We present the analysis of the muon events with all muon multiplicities collected during 21804 h of operation of the first LVD tower. The measured depth-angular distribution of muon intensities has been used to obtain the normalization factor A the power index γ of the primary all-nucleon spectrum, and the ratio Rc of the prompt muon flux to that of π mesons—the main parameters which determine the spectrum of cosmic ray muons at the sea level. The values of γ=2.77±0.05 (68% C.L.) and Rc<2.0×10-3 (95% C.L.) have been obtained. The upper limit to the prompt muon flux favors the models of charm production based on QGSM and the dual parton model.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.60.112001
DOI:
10.1103/PhysRevD.60.112001
*Present address: University of Salerno and INFN-Salerno, Salerno, Italy. †Present address: Univerity of Sheffield, Sheffield, United Kingdom.
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