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Titolo:
Low energy atmospheric muon neutrinos in MACRO
Autore:
Ambrosio, M; Antolini, R; Auriemma, G; Bakari, D; Baldini, A; Barbarino, GC; Barish, BC; Battistoni, G; Bellotti, R; Bemporad, C; Bernardini, P; Bilokon, H; Bisi, V; Bloise, C; Bower, C; Brigida, M; Bussino, S; Cafagna, F; Calicchio, M; Campana, D; Carboni, M; Cecchini, S; Cei, F; Chiarella, V; Choudhary, BC; Coutu, S; De Cataldo, G; Dekhissi, H; De Marzo, C; De Mitri, I; Derkaoui, J; De Vincenzi, M; Di Credico, A; Erriquez, O; Favuzzi, C; Forti, C; Fusco, P; Giacomelli, G; Giannini, G; Giglietto, N; Giorgini, M; Grassi, M; Gray, L; Grillo, A; Guarino, F; Gustavino, C; Habig, A; Hanson, K; Heinz, R; Iarocci, E; Katsavounidis, E; Katsavounidis, I; Kearns, E; Kim, H; Kyriazopoulou, S; Lamanna, E; Lane, C; Levin, DS; Lipari, P; Longley, NP; Longo, MJ; Loparco, F; Maaroufi, F; Mancarella, G; Mandrioli, G; Margiotta, A; Marini, A; Martello, D; Marzari-Chiesa, A; Mazziotta, MN; Michael, DG; Mikheyev, S; Miller, L; Monacelli, P; Montaruli, T; Monteno, M; Mufson, S; Musser, J; Nicolo, D; Nolty, R; Orth, C; Osteria, G; Ouchrif, M; Palamara, O; Patera, V; Patrizii, L; Pazzi, R; Peck, CW; Perrone, L; Petrera, S; Pistilli, P; Popa, V; Raino, A; Reynoldson, J; Ronga, F; Satriano, C; Satta, L; Scapparone, E; Scholberg, K; Sciubba, A; Serra, P; Sioli, M; Sirri, G; Sitta, M; Spinelli, P; Spinetti, M; Spurio, M; Steinberg, R; Stone, JL; Sulak, LR; Surdo, A; Tarle, G; Togo, V; Vakili, M; Vilela, E; Walter, CW; Webb, R;
Indirizzi:
Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy Univ Bologna Bologna Italy I-40126 artimento Fis, I-40126 Bologna, Italy Ist Nazl Fis Nucl, I-40126 Bologna, Italy Ist Nazl Fis Nucl Bologna Italy I-40126 Fis Nucl, I-40126 Bologna, Italy Univ Bari, Dipartimento Fis, I-70126 Bari, Italy Univ Bari Bari Italy I-70126 Bari, Dipartimento Fis, I-70126 Bari, Italy Ist Nazl Fis Nucl, I-70126 Bari, Italy Ist Nazl Fis Nucl Bari Italy I-70126 Nazl Fis Nucl, I-70126 Bari, Italy Dept Phys, Boston, MA 02215 USA Dept Phys Boston MA USA 02215Dept Phys, Boston, MA 02215 USA CALTECH, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125CALTECH, Pasadena, CA 91125 USA Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA Drexel Univ Philadelphia PA USA 19104 pt Phys, Philadelphia, PA 19104 USA Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Roma, Italy Ist Nazl Fis Nucl Frascati Roma Italy I-00044 00044 Frascati, Roma, Italy Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Laquila, Italy Ist Nazl Fis Nucl Laquila Italy I-67010 an Sasso, I-67010 Laquila, Italy Indiana Univ, Dept Phys, Bloomington, IN 47405 USA Indiana Univ Bloomington IN USA 47405 ept Phys, Bloomington, IN 47405 USA Indiana Univ, Dept Astron, Bloomington, IN 47405 USA Indiana Univ Bloomington IN USA 47405 t Astron, Bloomington, IN 47405 USA Univ Aquila, Dipartimento Fis, I-67100 Laquila, Italy Univ Aquila Laquila Italy I-67100 partimento Fis, I-67100 Laquila, Italy Ist Nazl Fis Nucl, I-67100 Laquila, Italy Ist Nazl Fis Nucl Laquila Italy I-67100 Fis Nucl, I-67100 Laquila, Italy Univ Lecce, Dipartimento Fis, I-73100 Lecce, Italy Univ Lecce Lecce Italy I-73100 e, Dipartimento Fis, I-73100 Lecce, Italy Ist Nazl Fis Nucl, I-73100 Lecce, Italy Ist Nazl Fis Nucl Lecce Italy I-73100 azl Fis Nucl, I-73100 Lecce, Italy Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Dept Phys, Ann Arbor, MI 48109 USA Univ Naples, Dipartimento Fis, I-80125 Naples, Italy Univ Naples Naples Italy I-80125 Dipartimento Fis, I-80125 Naples, Italy Ist Nazl Fis Nucl, I-80125 Naples, Italy Ist Nazl Fis Nucl Naples Italy I-80125 l Fis Nucl, I-80125 Naples, Italy Univ Pisa, Dipartimento Fis, I-56010 Pisa, Italy Univ Pisa Pisa Italy I-56010 Pisa, Dipartimento Fis, I-56010 Pisa, Italy Ist Nazl Fis Nucl, I-56010 Pisa, Italy Ist Nazl Fis Nucl Pisa Italy I-56010 Nazl Fis Nucl, I-56010 Pisa, Italy Univ Rome La Sapienza, Dipartimento Fis, I-00185 Rome, Italy Univ Rome La Sapienza Rome Italy I-00185 imento Fis, I-00185 Rome, Italy Ist Nazl Fis Nucl, I-00185 Rome, Italy Ist Nazl Fis Nucl Rome Italy I-00185 Nazl Fis Nucl, I-00185 Rome, Italy Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 t Phys, College Stn, TX 77843 USA Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy Univ Turin Turin Italy I-10125 to Fis Sperimentale, I-10125 Turin, Italy Ist Nazl Fis Nucl, I-10125 Turin, Italy Ist Nazl Fis Nucl Turin Italy I-10125 azl Fis Nucl, I-10125 Turin, Italy Univ Mohamed 1, Fac Sci, LPTP, Oujda, Morocco Univ Mohamed 1 Oujda Morocco v Mohamed 1, Fac Sci, LPTP, Oujda, Morocco Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy Univ Roma Tre Rome Italy I-00146 , Dipartimento Fis, I-00146 Rome, Italy Ist Nazl Fis Nucl, Sezione Roma Tre, I-00146 Rome, Italy Ist Nazl Fis Nucl Rome Italy I-00146 zione Roma Tre, I-00146 Rome, Italy Univ Basilicata, I-85100 Potenza, Italy Univ Basilicata Potenza Italy I-85100 Basilicata, I-85100 Potenza, Italy Ist Nazl Fis Nucl, I-20133 Milan, Italy Ist Nazl Fis Nucl Milan Italy I-20133 azl Fis Nucl, I-20133 Milan, Italy CNR, Ist Tesre, I-40129 Bologna, Italy CNR Bologna Italy I-40129CNR, Ist Tesre, I-40129 Bologna, Italy Penn State Univ, Dept Phys, University Pk, PA 16801 USA Penn State Univ University Pk PA USA 16801 s, University Pk, PA 16801 USA Univ Trieste, I-34100 Trieste, Italy Univ Trieste Trieste Italy I-34100Univ Trieste, I-34100 Trieste, Italy Ist Nazl Fis Nucl, I-34100 Trieste, Italy Ist Nazl Fis Nucl Trieste Italy I-34100 Fis Nucl, I-34100 Trieste, Italy Univ Rome, Dipartimento Energet, I-00185 Rome, Italy Univ Rome Rome Italy I-00185 , Dipartimento Energet, I-00185 Rome, Italy Univ Calabria, Dipartimento Fis, Rende, CS, Italy Univ Calabria Rende CS Italy alabria, Dipartimento Fis, Rende, CS, Italy Colorado Coll, Colorado Springs, CO 80903 USA Colorado Coll Colorado Springs CO USA 80903 olorado Springs, CO 80903 USA Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia Russian Acad Sci Moscow Russia 117312 st Nucl Res, Moscow 117312, Russia James Madison Univ, Dept Phys, Harrisonburg, VA 22807 USA James Madison Univ Harrisonburg VA USA 22807 , Harrisonburg, VA 22807 USA Scuola Normale Super Pisa, I-56010 Pisa, Italy Scuola Normale Super Pisa Pisa Italy I-56010 r Pisa, I-56010 Pisa, Italy Inst Space Sci, Bucharest 76900, Romania Inst Space Sci Bucharest Romania 76900 ace Sci, Bucharest 76900, Romania
Titolo Testata:
PHYSICS LETTERS B
fascicolo: 1-3, volume: 478, anno: 2000,
pagine: 5 - 13
SICI:
0370-2693(20000406)478:1-3<5:LEAMNI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Ambrosio, M Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy Univ Bologna Bologna Italy I-40126 s, I-40126 Bologna, Italy
Citazione:
M. Ambrosio et al., "Low energy atmospheric muon neutrinos in MACRO", PHYS LETT B, 478(1-3), 2000, pp. 5-13

Abstract

We present the measurement of two event samples induced by atmospheric v(mu) of average energy (E) over bar(v) similar to 4 GeV. In the first sample,a neutrino interacts inside the MACRO detector producing an upward-going muon leaving the apparatus. The ratio of the number of observed to expected events is 0.57 +/- 0.05(stat) +/- 0.06(syst) +/- 0.14(theor) with an angular distribution similar to that expected from the Bartol atmospheric neutrino flux. The second is a mixed sample of internally produced downward-going muons and externally produced upward-going muons stopping inside the detector. These two subsamples are selected by topological criteria; the lack of timing information makes it impossible to distinguish stopping from downgoing muons. The ratio of the number of observed to expected events is 0.71 +/- 0.05(stat) +/- 0.07(syst) +/- 0.18(theor). The observed deficits in each subsample is in agreement with neutrino oscillations, although the significance is reduced by the large theoretical errors. However, the ratio of the two samples causes a large cancellation of theoretical and of some systematic errors. With the ratio, we rule out the no-oscillation hypothesis at 95%c.l. Furthermore, the ratio tests the pathlength dependence of possible oscillations. The data of both samples and their ratio favor maximal mixing and Delta m(2) similar to 10(-3)-10(-2) eV(2). These parameters are in agreement with our results from upward throughgoing muons, induced by v(mu) of much higher energies. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/12/20 alle ore 10:37:10