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Journal of High Energy Physics Volume 2007 JHEP12(2007) Create an alert RSS this journal

The KLOE collaboration et al JHEP12(2007)105 doi:10.1088/1126-6708/2007/12/105

Measurement of the KL → πμν form factor parameters with the KLOE detector

The KLOE collaboration, F. Ambrosino4, A. Antonelli1, M. Antonelli1, F. Archilli1, C. Bacci7, P. Beltrame4, G. Bencivenni1, S. Bertolucci1, C. Bini5, C. Bloise1, S. Bocchetta7, F. Bossi1, P. Branchini7, R. Caloi6, P. Campana1, G. Capon1, T. Capussela1, F. Ceradini7, S. Chi1, G. Chiefari4, P. Ciambrone1, E. De Lucia1, A. De Santis6, P. De Simone1, G. De Zorzi6, A. Denig2, A. Di Domenico6, C. Di Donato4, B. Di Micco7, A. Doria4, M. Dreucci1, G. Felici1, A. Ferrari1, M. L. Ferrer1, S. Fiore6, C. Forti1, P. Franzini6, C. Gatti1, P. Gauzzi6, S. Giovannella1, E. Gorini3, E. Graziani7, W. Kluge2, V. Kulikov10, F. Lacava6, G. Lanfranchi1, J. Lee-Franzini1,8, D. Leone2, M. Martini1, P. Massarotti4, W. Mei1, S. Meola4, S. Miscetti1, M. Moulson1, S. Müller1, F. Murtas1, M. Napolitano4, F. Nguyen7, M. Palutan1, E. Pasqualucci6, A. Passeri7, V. Patera1,5, F. Perfetto4, M. Primavera3, P. Santangelo1, G. Saracino4, B. Sciascia1, A. Sciubba1,5, A. Sibidanov1, T. Spadaro1, M. Testa6, L. Tortora7, P. Valente6, G. Venanzoni1, R.Versaci1 and G. Xu1,9

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Abstract References Cited By
Using 328 pb−1 of data collected at DAΦNE corresponding to ~1.8 million KL → πμν decays, we have measured the Kμ3 form factor parameters. The structure of the K−π vector-current provides information about the dynamics of the strong interaction; its knowledge is necessary for evaluation of the phase-space integral required for measuring the CKM matrix element Vus and for testing lepton universality in kaon decays. Using a new parametrization for the vector and scalar form factors, we find λ+ = (25.7 ± 0.6) × 10−3, and λ0 = (14.0 ± 2.1) × 10−3. Our result for λ0, together with recent lattice calculations of fπ, fK and f(0), satisfies the Callan-Treiman relation.

 
An erratum page was received on 9 January 2008 and added to the end of the published paper on 7 March 2008.
Keywords

e+-e- Experiments

 

E-print Number: 0710.4470

Cited: by |

Refers: to

PACS

13.20.Eb Decays of K mesons

12.15.-y Electroweak interactions

13.40.Gp Electromagnetic form factors

11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries

14.40.Aq pi, K, and eta mesons

Subjects

Particle physics and field theory

Dates

Issue 12 (December 2007)

Received 25 October 2007, accepted for publication 19 December 2007

Published 31 December 2007



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