Measurement of the strong coupling constant using τ decays

Buskulic, D.; Décamp, D.; Goy, C.; Lees, J. P.; Minard, M.-N.; Mours, B.; Pietrzyk, B.; Alemany, R.; Ariztizabal, F.; Comas, P.; Crespo, J.M.; Delfino, M.; Fernández, E.; Fernández-Bosman, M.; Gaitan, V.; Garrido, Ll.; Mattison, T. S.; Pacheco, A.; Aranda, C. Padilla; Pascual, Á.; Creanza, D.; Palma, M. De; Farilla, A.; Iaselli, G.; Mäggi, G.; Maggi, M.; Natali, S.; Nuzzo, S.; Quattromini, M.; Ranieri, A.; Raso, G.; Romanò, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Chai, Y.; Hu, H.; Huang, D.; Huang, X. T.; Lin, J.; Wang, T.; Xie, Y.; Xu, D.; Xu, R.; Zhang, J.; Zhang, L.; Zhao, W.; Bauerdick, L. A. T.; Blucher, E.; Bonvicini, G.; Boudreau, J.; Casper, D.; Drevermann, H.; Forty, R.; Ganis, G.; Hagelberg, R.; Harvey, J.; Haywood, S. J.; Hilgart, J.; Jacobsen, R.G.; Jost, B.; Knobloch, J.; Lehraus, I.; Löhse, T.; Lusiani, A.; Martı́nez, M.; Mató, P.; Meinhard, H.; Minten, A.; Miotto, A.; Miquel, R.; Moser, H. G.; Palazzi, P.; Perlas, J. A.; Pusztaszeri, J. F.; Ranjard, F.; Redlinger, G.; Rolandi, G.; Rothberg, J.; Ruan, T.; Saich, M.; Schlatter, D.; Schmelling, M.; Sefkow, F.; Tejessy, W.; Wachsmuth, H.; Wiedenmann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Z.; Badaud, F.; Bardadin-Otwinowska, M.; Fellous, R. El; Falvard, A.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Montret, Jean-Claude; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Prulhière, F.; Saadi, F.; Fearnley, T.; Hansen, J. D.; Hansen, P. H.; Möllerud, R.; Nilsson, B.S.; Efthymiopoulos, I.; Kyriakis, A.; Simopoulou, E.; Vayaki, A.; Zachariadou, K.; Badier, J.; Blondel, A.; Bonneaud, G. R.; Brient, J. C.; Fouque, G.; Orteu, S.; Rougé, A.; Rumpf, M.; Tanaka, R.; Verderi, M.; Videau, H.; Candlin, D. J.; Parsons, M. I.; Veitch, E.; Moneta, L.; Parrini, G.; Corden, M.; Georgiopoulos, C.; Ikeda, M.; Lannutti, J.; Levinthal, D.; Mermikides, M.; Sawyer, L.; Wasserbaech, S.; Antonelli, A.; Baldini, R.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; D’Ettorre-Piazzoli, B.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, F.; Passalacqua, L.; Pepe-Altarelli, M.; Picchi, P.; Colrain, P.; Have, I. ten; Lynch, J.G.; Maitland, W.; Morton, W. T.; Raine, C.; Reeves, P.; Scarr, J. M.; Smith, K. M.; Smith, M. G.; Thompson, A. S.; Turnbull, R.M.; Brandl, B.; Braun, O.; Geweniger, C.; Hanke, P.; Hepp, V.; Kluge, E. E.; Maumary, Y.; Putzer, A.; Rensch, B.; Stahl, A.; Tittel, K.; Wunsch, M.; Belk, A. T.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Cattaneo, M.; Colling, D.; Dornan, P. J.; Dugeay, S.; Greene, A. M.; Hassard, J. F.; Lieske, N. M.; Nash, J.; Payne, D. G.; Phillips, M. J.; Sedgbeer, J. K.; Tomalin, I. R.; Wright, A. G.; Girtler, P.; Kneringer, E.; Kühn, D.; Rudolph, G.; Bowdery, C. K.; Brodbeck, T. J.; Finch, A. J.; Foster, F.; Hughes, G.; Jackson, D.; Keemer, N. R.; Nuttall, M.; Patel, Apoorva; Sloan, T.; Snow, S. W.; Whelan, E. P.; Kleinknecht, K.; Raab, J.; Renk, B.; Sander, H. G.; Schmidt, H.; Steeg, F.; Walther, S. M.; Wanke, R.; Wolf, B.; Aubert, J.J.; Bencheikh, A. M.; Benchouk, C.; Bonissent, A.; Carr, J.; Coyle, P.; Drinkard, J.; Etienne, F.; Nicod, D.; Papalexiou, S.; Payre, P.; Roos, L.; Rousseau, D.; Schwemling, Ph.; Talby, M.; Adlung, S.; Assmann, R.; Bauer, C.; Blum, W.; Brown, D. N.; Cattaneo, P. W.; Dehning, B.; Dietl, H.; Dydak, F.; Frank, M.; Halley, A.W.; Lauber, J.; Lütjens, G.; Lütz, G.; Männer, W.; Richter, R.; Rotscheidt, H.; Schröder, J.; Schwarz, A. S.; Settles, R.; Seywerd, H.; Stierlin, U.; Stiegler, U.; Denis, R. St.; Wolf, G.; Boucrot, J.; Callot, O.; Cordier, A.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, P.; Jaffe, D. E.; Janot, P.; Kim, D.W.; Diberder, F. Le; Lefrançois, J.; Lutz, A. M.; Schune, M. H.; Veillet, J. J.; Videau, I.; Zhang, Z.; Abbaneo, D.; Bagliesi, G.; Batignani, G.; Bosisio, L.; Bottigli, U.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M. A.; Dell’Orso, R.; Ferrante, I.; Fidecaro, F.; Foà, L.; Focardi, E.; Forti, F.; Giassi, A.; Giorgi, M. A.; Gregorio, A.; Ligabue, F.; Mannelli, E. B.; Marrocchesi, P. S.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Spagnolo, P.; Steinberger, J.; Тенчини, Р.; Tonelli, G.; Triggiani, G.; Vannini, C.; Venturi, A.; Verdini, P. G.; Walsh, J.; Betteridge, A. P.; Carter, J.M.; Green, M.G.; March, P.V.; Mir, L. M.; Medcalf, T.; Quazi, I. S.; Strong, J. A.; West, L.R.; Botterill, D.; Clifft, R. W.; Edgecock, R.; Edwards, M.; Fisher, S. M.; Jones, T. J.; Norton, P. R.; Salmon, D. P.; Thompson, J.C.; Bloch-Devaux, B.; Colas, P.; Duarte, H.; Kozanecki, W.; Lançon, E.; Lemaire, M. C.; Locci, E.; Pérez, P.; Perrier, Frédéric; Rander, J.; Renardy, J. F.; Rosowsky, A.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Mohand, D. Si; Vallage, B.; Johnson, R.P.; Litke, A. M.; Taylor, G. N.; Wear, J.; Ashman, J. G.; Babbage, W.; Booth, C. N.; Buttar, C. M.; Carney, R.; Cartwright, S. L.; Combley, F.; Hatfield, F.; Thompson, L.F.; Barberio, E.; Böhrer, A.; Brandt, Siegmund; Cowan, G.; Grupen, C.; Lutters, G.; Rivera, F.; Schäfer, U.; Smolík, L.; Marina, R. Della; Giannini, G.; Gobbo, B.; Ragusa, F.; Bellantoni, L.; Chen, W.; Cinabro, D.; Conway, J.; Cowen, D. F.; Feng, Z.; Ferguson, D.P.S.; Gao, Y. S.; Grahl, J.; Harton, J. L.; Jared, R. C.; LeClaire, B. W.; Lishka, C.; Pan, Y.; Pater, J. R.; Saadi, Y.; Sharma, V.; Schmitt, M.; Shi, Z. H.; Walsh, A. M.; Weber, F. V.; Wu, S. L.; Wu, X.; Zheng, M.; Zobernig, G.

doi:10.1016/0370-2693(93)90212-z

Cited by 68 publications

(33 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1. The motivation to resum these terms to all orders is the following: The coefficients in the perturbative series (12) and (16), which are polynomials in the number of quark flavours n f , can be reorganized as polynomials in β 0 , i.e.…”

Section: Spectral Momentsmentioning

confidence: 99%

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The physics of hadrons

Neubert

1996

Nuclear Physics B

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The calculation of perturbative corrections to the spectral moments observable in hadronic τ decays is reconsidered. The exact order-α 3 s results and the resummation procedure of Le Diberder and Pich are compared with a partial resummation of the perturbative series based on the analysis of so-called renormalon chains. The perturbative analysis is complemented by a model-independent description of power corrections. For the contributions of dimension four and six in the OPE, it is demonstrated how infrared renormalon ambiguities in the definition of perturbation theory can be absorbed by a redefinition of nonperturbative parameters. We find that previous determinations of QCD parameters from a measurement of spectral moments in τ decays have underestimated the theoretical uncertainties. Given the present understanding of the asymptotic behaviour of perturbation theory, the running coupling constant can be measured at best with a theoretical uncertainty δα s (m 2 τ ) ≃ 0.05, and the gluon condensate with an uncertainty of order its magnitude. Two weighted integrals of the hadronic spectral function are constructed, which can be used to test the absence of dimension-two operators and to measure directly the gluon condensate.

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Section: Spectral Momentsmentioning

confidence: 99%

“…A QCD-based analysis of power-suppressed effects by measuring spectral moments in hadronic τ decays has been pursued by two experimental groups [16,17]. There is a theoretical obstacle to any such analysis, however.…”

Section: Introductionmentioning

confidence: 99%

The physics of hadrons

Neubert

1996

Nuclear Physics B

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“…The measurement of α s at the tau mass scale was carried out for the first time by ALEPH in 1993 using about 8500 τ decays [2]. This is followed by CLEO in 1995 [6] and by OPAL in 1999 [7] using the same technique.…”

Section: Measurements Of α S (Mmentioning

confidence: 99%

“…The update in 1998 [3] was based on about 30 times of more data than those used in [2] and α s was determined for the first time with three independent spectral functions V, A and V + A. In addition, the V − A spectral function also allowed the evaluation of the finite energy chiral sum rules up to the τ mass.…”

Section: Measurements Of α S (Mmentioning

confidence: 99%

“…Measurements performed by ALEPH [2][3][4][5], CLEO [6] and OPAL [7] are briefly reviewed in the following together with other determinations, focusing on the latest ALEPH results. Over the years, the two main improvements in the measurement of α s (m 2 τ ) were * Email address: zhangzq@lal.in2p3.fr (Zhiqing Zhang) from the increased precision of the branching ratio and spectral function measurements and the higher-order perturbative calculation.…”

Section: Introductionmentioning

confidence: 99%

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Tau Decays and αs

Zhang

2015

Nuclear and Particle Physics Proceedings

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The evolution of the determination of the strong coupling constant α s from the leptonic branching ratios, the lifetime, and the invariant mass distributions of the hadronic final state of the τ lepton over the last two decades is briefly reviewed. The improvements in the latest ALEPH update are described in some detail. Currently this is one of the most precise α s determinations. Together with the other determination at the Z boson mass pole, they constitutes the most accurate test of the asymptotic freedom in QCD.

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QCD Sum Rules for Skeptics

1997

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A new Monte-Carlo based uncertainty analysis is introduced to quantitatively determine the predictive ability of QCD sum rules. A comprehensive analysis of ground state rho-meson and nucleon spectral properties is performed. Many of the findings contradict the conventional wisdom of both practitioners and skeptics alike. Associations between the phenomenological fit parameters are particularly interesting as they reveal how the sum rules resolve the spectral properties. The use of derivative sum rules for the determination of rho-meson spectral properties is shown to be a very unfavorable approach. Most prior nucleon sum rule analyses are based on a sum rule which is found to be invalid; the results are suspect, and should be reevaluated. The ``Ioffe formula'', argued by many to qualitatively encapsulate a description of the nucleon mass in terms of the chiral symmetry breaking order parameter is misleading at best. QCD Sum Rules are found to be self-consistent without contributions from direct instantons. This implies that instanton effects are adequately accounted for in the nonperturbative vacuum condensates. This in-depth examination of QCD sum rule self consistency paints a favorable picture for further quantitative refinements of the QCD sum rule approach.Comment: 70 page RevTeX Manuscript with 40 embedded figures. Revised manuscript accepted for publication. Recent estimates of QCD vacuum condensates are used in the analysis. This and related papers may also be obtained from http://www.phys.washington.edu/~derek/Publications.htm

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Measurement of the strong coupling constant using τ decays

Cited by 68 publications

References 40 publications

The physics of hadrons

The physics of hadrons

Tau Decays and αs

QCD Sum Rules for Skeptics

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