Determination of the muon charge sign with the dipolar spectrometers of the OPERA experiment

OPERA Collaboration: N. Agafonova , A. Aleksandrov , A. Anokhina , S. Aoki , A. Ariga , T. Ariga , D. Bender , A. Bertolin

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C. Bozza R. Brugnera A. Buonaura S. Buontempo B. B\"uttner M. Chernyavsky A. Chukanov L. Consiglio N. D'Ambrosio G. De Lellis M. De Serio P. Del Amo Sanchez A. Di Crescenzo D. Di Ferdinando N. Di Marco S. Dmitrievski M. Dracos D. Duchesneau S. Dusini T. Dzhatdoev J. Ebert A. Ereditato R. A. Fini T. Fukuda G. Galati A. Garfagnini G. Giacomelli C. Goellnitz J. Goldberg D. Goloubkov Y. Gornushkin G. Grella M. Guler C. Gustavino C. Hagner T. Hara A. Hollnagel B. Hosseini H. Ishida K. Ishiguro K. Jakovcic C. Jollet C. Kamiscioglu M. Kamiscioglu J. Kawada J. H. Kim S. H. Kim N. Kitagawa B. Klicek K. Kodama M. Komatsu U. Kose I. Kreslo A. Lauria J. Lenkeit A. Ljubicic A. Longhin P. Loverre A. Malgin M. Malenica G. Mandrioli T. Matsuo V. Matveev N. Mauri E. Medinaceli A. Meregaglia M. Meyer S. Mikado P. Monacelli M. C. Montesi K. Morishima M. T. Muciaccia N. Naganawa T. Naka M. Nakamura T. Nakano Y. Nakatsuka K. Niwa S. Ogawa N. Okateva A. Olshevsky T. Omura K. Ozaki A. Paoloni B. D. Park I. G. Park L. Pasqualini A. Pastore L. Patrizii H. Pessard C. Pistillo D. Podgrudkov N. Polukhina M. Pozzato F. Pupilli M. Roda H. Rokujo T. Roganova G. Rosa I. Rostovtseva O. Ryazhskaya O. Sato Y. Sato A. Schembri I. Shakiryanova T. Shchedrina A. Sheshukov H. Shibuya T. Shiraishi G. Shoziyoev S. Simone M. Sioli C. Sirignano G. Sirri M. Spinetti L. Stanco N. Starkov S. M. Stellacci M. Stipcevic P. Strolin S. Takahashi M. Tenti F. Terranova V. Tioukov S. Tufanli P. Vilain M. Vladimirov L. Votano J. L. Vuilleumier G. Wilquet B. Wonsak C. S. Yoon Y. Zaitsev S. Zemskova A. Zghiche

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classification ⚛️ physics.ins-det hep-ex

keywords chargemuondecaydeterminationexperimentinteractionsmatchingmethod

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The OPERA long-baseline neutrino-oscillation experiment has observed the direct appearance of $\nu_\tau$ in the CNGS $\nu_\mu$ beam. Two large muon magnetic spectrometers are used to identify muons produced in the $\tau$ leptonic decay and in $\nu_\mu^{CC}$ interactions by measuring their charge and momentum. Besides the kinematic analysis of the $\tau$ decays, background resulting from the decay of charmed particles produced in $\nu_\mu^{CC}$ interactions is reduced by efficiently identifying the muon track. A new method for the charge sign determination has been applied, via a weighted angular matching of the straight track-segments reconstructed in the different parts of the dipole magnets. Results obtained for Monte Carlo and real data are presented. Comparison with a method where no matching is used shows a significant reduction of up to 40\% of the fraction of wrongly determined charges.

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Determination of the muon charge sign with the dipolar spectrometers of the OPERA experiment

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