We present a new technique, "tau polarimetry," for measuring the longitudinal beam polarization present in an e(+)e(-) collider through the analysis of e(+)e(-) -> tau(+)tau(-) events. By exploiting the sensitivity of tau decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using 424.2 +/- 1.8 fb(-1) of BABAR data at root s = 10.58 GeV, the average longitudinal polarization of the PEP-II e(+)e(-) collider has been measured to be < P > = 0.0035 +/- 0.0024(stat) +/- 0.0029(sys). The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed e(-) beam longitudinal polarization upgrade to the SuperKEKB e(+)e(-) collider would benefit from this technique. (BABAR Collaboration)
Precision e− beam polarimetry at an e+e− B factory using tau-pair events / J. . Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. . Brown, Y. . Kolomensky, M. Fritsch, H. Koch, R. Cheaib, C. Hearty, T. . Mattison, J. . Mckenna, R. . So, V. . Blinov, A. . Buzykaev, V. . Druzhinin, E. . Kozyrev, E. . Kravchenko, S. . Serednyakov, Y. . Skovpen, E. . Solodov, K. . Todyshev, A. . Lankford, B. Dey, J. . Gary, O. Long, A. . Eisner, W. . Lockman, W. Panduro Vazquez, D. . Chao, C. . Cheng, B. Echenard, K. . Flood, D. . Hitlin, Y. Li, D. . Lin, S. Middleton, T. . Miyashita, P. Ongmongkolkul, J. Oyang, F. . Porter, M. Röhrken, B. . Meadows, M. . Sokoloff, J. . Smith, S. . Wagner, D. Bernard, M. Verderi, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, V. Santoro, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. . Peruzzi, M. Piccolo, M. Rotondo, A. Zallo, S. Passaggio, C. Patrignani, B. . Shuve, H. . Lacker, B. Bhuyan, U. Mallik, C. Chen, J. Cochran, S. Prell, A. . Gritsan, N. Arnaud, M. Davier, F. Le Diberder, A. . Lutz, G. Wormser, D. . Lange, D. . Wright, J. . Coleman, D. . Hutchcroft, D. . Payne, C. Touramanis, A. . Bevan, F. Di Lodovico, G. Cowan, S. Banerjee, D. . Brown, C. . Davis, A. . Denig, W. Gradl, K. Griessinger, A. Hafner, K. . Schubert, R. . Barlow, G. . Lafferty, R. Cenci, A. Jawahery, D. . Roberts, R. Cowan, S. . Robertson, R. . Seddon, N. Neri, F. Palombo, L. Cremaldi, R. Godang, D. . Summers, G. De Nardo, C. Sciacca, C. . Jessop, J. . Losecco, K. Honscheid, A. Gaz, M. Margoni, G. Simi, F. Simonetto, R. Stroili, S. Akar, E. Ben-Haim, M. Bomben, G. . Bonneaud, G. Calderini, J. Chauveau, G. Marchiori, J. Ocariz, M. Biasini, E. Manoni, A. Rossi, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, M. Chrzaszcz, F. Forti, M. . Giorgi, A. Lusiani, B. Oberhof, E. Paoloni, M. Rama, G. Rizzo, J. . Walsh, L. Zani, A. . . Smith, F. Anulli, R. Faccini, F. Ferrarotto, F. Ferroni, A. Pilloni, C. Bünger, S. Dittrich, O. Grünberg, T. Leddig, C. Voß, R. Waldi, T. Adye, F. . Wilson, S. Emery, G. Vasseur, D. Aston, C. Cartaro, M. . Convery, W. Dunwoodie, M. Ebert, R. . Field, B. . Fulsom, M. . Graham, C. Hast, P. Kim, S. Luitz, D. . Macfarlane, D. . Muller, H. Neal, B. . Ratcliff, A. Roodman, M. . Sullivan, J. Va'Vra, W. . Wisniewski, M. . Purohit, J. . Wilson, S. . Sekula, H. Ahmed, N. Tasneem, M. Bellis, P. . Burchat, E. . . Puccio, J. . Ernst, R. Gorodeisky, N. Guttman, D. . Peimer, A. Soffer, S. . Spanier, J. . Ritchie, J. . Izen, X. . Lou, F. Bianchi, F. De Mori, A. Filippi, L. Lanceri, L. Vitale, F. Martinez-Vidal, A. Oyanguren, J. Albert, A. Beaulieu, F. . Bernlochner, G. Godden, G. . King, R. Kowalewski, T. Lueck, C. Miller, I. . Nugent, J. . Roney, R. . Sobie, T. . Gershon, P. . Harrison, T. . Latham, S. . Wu. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:9(2023 Nov 02), pp. 092001.1-092001.20. [10.1103/physrevd.108.092001]
Precision e− beam polarimetry at an e+e− B factory using tau-pair events
N. Neri;F. Palombo;F. Simonetto;
2023
Abstract
We present a new technique, "tau polarimetry," for measuring the longitudinal beam polarization present in an e(+)e(-) collider through the analysis of e(+)e(-) -> tau(+)tau(-) events. By exploiting the sensitivity of tau decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using 424.2 +/- 1.8 fb(-1) of BABAR data at root s = 10.58 GeV, the average longitudinal polarization of the PEP-II e(+)e(-) collider has been measured to be < P > = 0.0035 +/- 0.0024(stat) +/- 0.0029(sys). The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed e(-) beam longitudinal polarization upgrade to the SuperKEKB e(+)e(-) collider would benefit from this technique. (BABAR Collaboration)| File | Dimensione | Formato | |
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