Abstract
We describe a measurement of the time-integrated luminosity of the data collected by the BABAR experiment at the PEP-II asymmetric-energy e+e- collider at the γ(4S), γ(3S), and γ(2S) resonances and in a continuum region below each resonance. We measure the time-integrated luminosity by counting e+ e-→e+e- and (for the γ(4S) only) e+e-→μ+μ- candidate events, allowing additional photons in the final state. We use data-corrected simulation to determine the cross-sections and reconstruction efficiencies for these processes, as well as the major backgrounds. Due to the large cross-sections of e+e-→e+e- and e+e-→μ+μ-, the statistical uncertainties of the measurement are substantially smaller than the systematic uncertainties. The dominant systematic uncertainties are due to observed differences between data and simulation, as well as uncertainties on the cross-sections. For data collected on the γ(3S) and γ(2S) resonances, an additional uncertainty arises due to γ→ e+e-X background. For data collected off the γ resonances, we estimate an additional uncertainty due to time dependent efficiency variations, which can affect the short off-resonance runs. The relative uncertainties on the luminosities of the on-resonance (off-resonance) samples are 0.43% (0.43%) for the γ(4S), 0.58% (0.72%) for the γ(3S), and 0.68% (0.88%) for the γ(2S).
Original language | English (US) |
---|---|
Pages (from-to) | 203-213 |
Number of pages | 11 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 726 |
DOIs | |
State | Published - 2013 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Instrumentation
Keywords
- BABAR
- Electron-positron collider
- Integrated luminosity
- PEP-II
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In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 726, 2013, p. 203-213.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Time-integrated luminosity recorded by the BABAR detector at the PEP-II e+e- collider
AU - Lees, J. P.
AU - Poireau, V.
AU - Tisserand, V.
AU - Grauges, E.
AU - Palano, A.
AU - Eigen, G.
AU - Stugu, B.
AU - Brown, D. N.
AU - Kerth, L. T.
AU - Kolomensky, Yu G.
AU - Lynch, G.
AU - Koch, H.
AU - Schroeder, T.
AU - Asgeirsson, D. J.
AU - Hearty, C.
AU - Mattison, T. S.
AU - McKenna, J. A.
AU - So, R. Y.
AU - Khan, A.
AU - Blinov, V. E.
AU - Buzykaev, A. R.
AU - Druzhinin, V. P.
AU - Golubev, V. B.
AU - Kravchenko, E. A.
AU - Onuchin, A. P.
AU - Serednyakov, S. I.
AU - Skovpen, Yu I.
AU - Solodov, E. P.
AU - Todyshev, K. Yu
AU - Yushkov, A. N.
AU - Kirkby, D.
AU - Lankford, A. J.
AU - Mandelkern, M.
AU - Dey, B.
AU - Gary, J. W.
AU - Long, O.
AU - Vitug, G. M.
AU - Campagnari, C.
AU - Franco Sevilla, M.
AU - Hong, T. M.
AU - Kovalskyi, D.
AU - Richman, J. D.
AU - West, C. A.
AU - Eisner, A. M.
AU - Lockman, W. S.
AU - Martinez, A. J.
AU - Schumm, B. A.
AU - Seiden, A.
AU - Chao, D. S.
AU - Cheng, C. H.
AU - Echenard, B.
AU - Flood, K. T.
AU - Hitlin, D. G.
AU - Ongmongkolkul, P.
AU - Porter, F. C.
AU - Rakitin, A. Y.
AU - Andreassen, R.
AU - Huard, Z.
AU - Meadows, B. T.
AU - Sokoloff, M. D.
AU - Sun, L.
AU - Bloom, P. C.
AU - Ford, W. T.
AU - Gaz, A.
AU - Nauenberg, U.
AU - Smith, J. G.
AU - Wagner, S. R.
AU - Ayad, R.
AU - Toki, W. H.
AU - Spaan, B.
AU - Schubert, K. R.
AU - Schwierz, R.
AU - Bernard, D.
AU - Verderi, M.
AU - Clark, P. J.
AU - Playfer, S.
AU - Bettoni, D.
AU - Bozzi, C.
AU - Calabrese, R.
AU - Cibinetto, G.
AU - Fioravanti, E.
AU - Garzia, I.
AU - Luppi, E.
AU - Piemontese, L.
AU - Santoro, V.
AU - Baldini-Ferroli, R.
AU - Calcaterra, A.
AU - De Sangro, R.
AU - Finocchiaro, G.
AU - Patteri, P.
AU - Peruzzi, I. M.
AU - Piccolo, M.
AU - Rama, M.
AU - Zallo, A.
AU - Contri, R.
AU - Guido, E.
AU - Lo Vetere, M.
AU - Monge, M. R.
AU - Passaggio, S.
AU - Patrignani, C.
AU - Robutti, E.
AU - Bhuyan, B.
AU - Prasad, V.
AU - Morii, M.
AU - Adametz, A.
AU - Uwer, U.
AU - Lacker, H. M.
AU - Lueck, T.
AU - Dauncey, P. D.
AU - Mallik, U.
AU - Chen, C.
AU - Cochran, J.
AU - Meyer, W. T.
AU - Prell, S.
AU - Rubin, A. E.
AU - Gritsan, A. V.
AU - Arnaud, N.
AU - Davier, M.
AU - Derkach, D.
AU - Grosdidier, G.
AU - Le Diberder, F.
AU - Lutz, A. M.
AU - Malaescu, B.
AU - Roudeau, P.
AU - Schune, M. H.
AU - Stocchi, A.
AU - Wormser, G.
AU - Lange, D. J.
AU - Wright, D. M.
AU - Burke, J. P.
AU - Coleman, J. P.
AU - Fry, J. R.
AU - Gabathuler, E.
AU - Gamet, R.
AU - Hutchcroft, D. E.
AU - Payne, D. J.
AU - Touramanis, C.
AU - Bevan, A. J.
AU - Di Lodovico, F.
AU - Sacco, R.
AU - Sigamani, M.
AU - Cowan, G.
AU - Brown, D. N.
AU - Davis, C. L.
AU - Denig, A. G.
AU - Fritsch, M.
AU - Gradl, W.
AU - Griessinger, K.
AU - Hafner, A.
AU - Prencipe, E.
AU - Barlow, R. J.
AU - Lafferty, G. D.
AU - Behn, E.
AU - Cenci, R.
AU - Hamilton, B.
AU - Jawahery, A.
AU - Roberts, D. A.
AU - Dallapiccola, C.
AU - Cowan, R.
AU - Dujmic, D.
AU - Sciolla, G.
AU - Cheaib, R.
AU - Patel, P. M.
AU - Robertson, S. H.
AU - Biassoni, P.
AU - Neri, N.
AU - Palombo, F.
AU - Cremaldi, L.
AU - Godang, R.
AU - Kroeger, R.
AU - Sonnek, P.
AU - Summers, D. J.
AU - Nguyen, X.
AU - Simard, M.
AU - Taras, P.
AU - De Nardo, G.
AU - Monorchio, D.
AU - Onorato, G.
AU - Sciacca, C.
AU - Martinelli, M.
AU - Raven, G.
AU - Jessop, C. P.
AU - Losecco, J. M.
AU - Honscheid, K.
AU - Kass, R.
AU - Brau, J.
AU - Frey, R.
AU - Sinev, N. B.
AU - Strom, D.
AU - Torrence, E.
AU - Feltresi, E.
AU - Gagliardi, N.
AU - Margoni, M.
AU - Morandin, M.
AU - Posocco, M.
AU - Rotondo, M.
AU - Simi, G.
AU - Simonetto, F.
AU - Stroili, R.
AU - Akar, S.
AU - Ben-Haim, E.
AU - Bomben, M.
AU - Bonneaud, G. R.
AU - Briand, H.
AU - Calderini, G.
AU - Chauveau, J.
AU - Hamon, O.
AU - Leruste, Ph
AU - Marchiori, G.
AU - Ocariz, J.
AU - Sitt, S.
AU - Biasini, M.
AU - Manoni, E.
AU - Pacetti, S.
AU - Rossi, A.
AU - Angelini, C.
AU - Batignani, G.
AU - Bettarini, S.
AU - Carpinelli, M.
AU - Casarosa, G.
AU - Cervelli, A.
AU - Forti, F.
AU - Giorgi, M. A.
AU - Lusiani, A.
AU - Oberhof, B.
AU - Paoloni, E.
AU - Perez, A.
AU - Rizzo, G.
AU - Walsh, J. J.
AU - Lopes Pegna, D.
AU - Olsen, J.
AU - Smith, A. J.S.
AU - Anulli, F.
AU - Faccini, R.
AU - Ferrarotto, F.
AU - Ferroni, F.
AU - Gaspero, M.
AU - Li Gioi, L.
AU - Mazzoni, M. A.
AU - Piredda, G.
AU - Bünger, C.
AU - Grünberg, O.
AU - Hartmann, T.
AU - Leddig, T.
AU - Voß, C.
AU - Waldi, R.
AU - Adye, T.
AU - Olaiya, E. O.
AU - Wilson, F. F.
AU - Emery, S.
AU - Hamel De Monchenault, G.
AU - Vasseur, G.
AU - Yèche, Ch
AU - Aston, D.
AU - Bard, D. J.
AU - Benitez, J. F.
AU - Cartaro, C.
AU - Convery, M. R.
AU - Dorfan, J.
AU - Dubois-Felsmann, G. P.
AU - Dunwoodie, W.
AU - Ebert, M.
AU - Field, R. C.
AU - Fulsom, B. G.
AU - Gabareen, A. M.
AU - Graham, M. T.
AU - Hast, C.
AU - Innes, W. R.
AU - Kelsey, M. H.
AU - Kim, P.
AU - Kocian, M. L.
AU - Leith, D. W.G.S.
AU - Lewis, P.
AU - Lindemann, D.
AU - Lindquist, B.
AU - Luitz, S.
AU - Luth, V.
AU - Lynch, H. L.
AU - Macfarlane, D. B.
AU - Muller, D. R.
AU - Neal, H.
AU - Nelson, S.
AU - Perl, M.
AU - Pulliam, T.
AU - Ratcliff, B. N.
AU - Roodman, A.
AU - Salnikov, A. A.
AU - Schindler, R. H.
AU - Snyder, A.
AU - Su, D.
AU - Sullivan, M. K.
AU - Va'Vra, J.
AU - Wagner, A. P.
AU - Wang, W. F.
AU - Wisniewski, W. J.
AU - Wittgen, M.
AU - Wright, D. H.
AU - Wulsin, H. W.
AU - Ziegler, V.
AU - Park, W.
AU - Purohit, M. V.
AU - White, R. M.
AU - Wilson, J. R.
AU - Randle-Conde, A.
AU - Sekula, S. J.
AU - Bellis, M.
AU - Burchat, P. R.
AU - Miyashita, T. S.
AU - Puccio, E. M.T.
AU - Alam, M. S.
AU - Ernst, J. A.
AU - Gorodeisky, R.
AU - Guttman, N.
AU - Peimer, D. R.
AU - Soffer, A.
AU - Spanier, S. M.
AU - Ritchie, J. L.
AU - Ruland, A. M.
AU - Schwitters, R. F.
AU - Wray, B. C.
AU - Izen, J. M.
AU - Lou, X. C.
AU - Bianchi, F.
AU - Gamba, D.
AU - Zambito, S.
AU - Lanceri, L.
AU - Vitale, L.
AU - Martinez-Vidal, F.
AU - Oyanguren, A.
AU - Villanueva-Perez, P.
AU - Ahmed, H.
AU - Albert, J.
AU - Banerjee, Sw
AU - Bernlochner, F. U.
AU - Choi, H. H.F.
AU - King, G. J.
AU - Kowalewski, R.
AU - Lewczuk, M. J.
AU - Nugent, I. M.
AU - Roney, J. M.
AU - Sobie, R. J.
AU - Tasneem, N.
AU - Gershon, T. J.
AU - Harrison, P. F.
AU - Latham, T. E.
AU - Band, H. R.
AU - Dasu, S.
AU - Pan, Y.
AU - Prepost, R.
AU - Wu, S. L.
N1 - Funding Information: We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support B A B AR . The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovación (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).
PY - 2013
Y1 - 2013
N2 - We describe a measurement of the time-integrated luminosity of the data collected by the BABAR experiment at the PEP-II asymmetric-energy e+e- collider at the γ(4S), γ(3S), and γ(2S) resonances and in a continuum region below each resonance. We measure the time-integrated luminosity by counting e+ e-→e+e- and (for the γ(4S) only) e+e-→μ+μ- candidate events, allowing additional photons in the final state. We use data-corrected simulation to determine the cross-sections and reconstruction efficiencies for these processes, as well as the major backgrounds. Due to the large cross-sections of e+e-→e+e- and e+e-→μ+μ-, the statistical uncertainties of the measurement are substantially smaller than the systematic uncertainties. The dominant systematic uncertainties are due to observed differences between data and simulation, as well as uncertainties on the cross-sections. For data collected on the γ(3S) and γ(2S) resonances, an additional uncertainty arises due to γ→ e+e-X background. For data collected off the γ resonances, we estimate an additional uncertainty due to time dependent efficiency variations, which can affect the short off-resonance runs. The relative uncertainties on the luminosities of the on-resonance (off-resonance) samples are 0.43% (0.43%) for the γ(4S), 0.58% (0.72%) for the γ(3S), and 0.68% (0.88%) for the γ(2S).
AB - We describe a measurement of the time-integrated luminosity of the data collected by the BABAR experiment at the PEP-II asymmetric-energy e+e- collider at the γ(4S), γ(3S), and γ(2S) resonances and in a continuum region below each resonance. We measure the time-integrated luminosity by counting e+ e-→e+e- and (for the γ(4S) only) e+e-→μ+μ- candidate events, allowing additional photons in the final state. We use data-corrected simulation to determine the cross-sections and reconstruction efficiencies for these processes, as well as the major backgrounds. Due to the large cross-sections of e+e-→e+e- and e+e-→μ+μ-, the statistical uncertainties of the measurement are substantially smaller than the systematic uncertainties. The dominant systematic uncertainties are due to observed differences between data and simulation, as well as uncertainties on the cross-sections. For data collected on the γ(3S) and γ(2S) resonances, an additional uncertainty arises due to γ→ e+e-X background. For data collected off the γ resonances, we estimate an additional uncertainty due to time dependent efficiency variations, which can affect the short off-resonance runs. The relative uncertainties on the luminosities of the on-resonance (off-resonance) samples are 0.43% (0.43%) for the γ(4S), 0.58% (0.72%) for the γ(3S), and 0.68% (0.88%) for the γ(2S).
KW - BABAR
KW - Electron-positron collider
KW - Integrated luminosity
KW - PEP-II
UR - http://www.scopus.com/inward/record.url?scp=84880391551&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84880391551&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2013.04.029
DO - 10.1016/j.nima.2013.04.029
M3 - Article
AN - SCOPUS:84880391551
SN - 0168-9002
VL - 726
SP - 203
EP - 213
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
ER -