Dimuon production by neutrinos in the Fermilab 15-ft bubble chamber at the Tevatron
The Fermilab 15-ft bubble chamber has been exposed to a quadrupole triplet neutrino beam produced at the Tevatron. The ratio of {nu} to {bar {nu}} in the beam is approximately 2.5. The mean event energy for {nu}-induced charged-current events is 150 GeV, and for {bar {nu}}-induced charged-current ev...
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Veröffentlicht in: | Physical review. D, Particles and fields Particles and fields, 1990-04, Vol.41 (7), p.2057-2073 |
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Sprache: | eng |
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Zusammenfassung: | The Fermilab 15-ft bubble chamber has been exposed to a quadrupole triplet neutrino beam produced at the Tevatron. The ratio of {nu} to {bar {nu}} in the beam is approximately 2.5. The mean event energy for {nu}-induced charged-current events is 150 GeV, and for {bar {nu}}-induced charged-current events it is 110 GeV. A total of 64 dimuon candidates (1 {mu}{sup +}{mu}{sup +}, 52 {mu}{sup {minus}}{mu}{sup +} and {mu}{sup +}{mu}{sup {minus}}, and 11 {mu}{sup {minus}}{mu}{sup {minus}}) is observed in the data sample of approximately 13 300 charged-current events. The number and properties of the {mu}{sup {minus}}{mu}{sup {minus}} and {mu}{sup +}{mu}{sup +} candidates are consistent with their being produced by background processes, the important sources being {pi} and {ital K} decay and punchthrough. The 90%-C.L. upper limit for {mu}{sup {minus}}{mu}{sup {minus}}/{mu}{sup {minus}} for muon momenta above 4 GeV/{ital c} is 1.2{times}10{sup {minus}3}, and for momenta above 9 GeV/{ital c} this limit is 1.1{times}10{sup {minus}3}. The opposite-sign-dimuon--to--single-muon ratio is (0.62{plus minus}0.13)% for muon momenta above 4 GeV/{ital c}. There are eight neutral strange particles in the opposite-sign sample, leading to a rate per dimuon event of 0.65{plus minus}0.29. The opposite-sign-dimuon sample is consistent with the hypothesis of charm production and decay. |
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ISSN: | 0556-2821 1089-4918 |
DOI: | 10.1103/PhysRevD.41.2057 |