We present a measurement of the K-π vector current form-factor parameters for the decay KL → π± e∓ ν. We use 328 pb-1 of data collected in 2001 and 2002, corresponding to ∼2 million Ke 3 events. Measurements of semileptonic form factors provide information about the dynamics of the strong interaction and are necessary for evaluation of the phase-space integral IKe needed to measure the CKM matrix element | Vu s | for KL → π± e∓ ν decays. Our result is λ+ = ( 28.6 ± 0.5 ± 0.4 ) × 10-3 for a linear fit, and λ+′ = ( 25.5 ± 1.5 ± 1.0 ) × 10-3, λ+″ = ( 1.4 ± 0.7 ± 0.4 ) × 10-3 for a quadratic fit. © 2006 Elsevier B.V. All rights reserved.
Ambrosino, F., Antonelli, A., Antonelli, M., B. a. c. c. i., C., Beltrame, P., Santovetti, E. (2006). Measurement of the form-factor slopes for the decay KL -> pi(+-) e(-+) nu with the KLOE detector. PHYSICS LETTERS. SECTION B, 636, 166-172 [10.1016/j.physletb.2006.03.036].
Measurement of the form-factor slopes for the decay KL -> pi(+-) e(-+) nu with the KLOE detector
SANTOVETTI, EMANUELE
2006-01-01
Abstract
We present a measurement of the K-π vector current form-factor parameters for the decay KL → π± e∓ ν. We use 328 pb-1 of data collected in 2001 and 2002, corresponding to ∼2 million Ke 3 events. Measurements of semileptonic form factors provide information about the dynamics of the strong interaction and are necessary for evaluation of the phase-space integral IKe needed to measure the CKM matrix element | Vu s | for KL → π± e∓ ν decays. Our result is λ+ = ( 28.6 ± 0.5 ± 0.4 ) × 10-3 for a linear fit, and λ+′ = ( 25.5 ± 1.5 ± 1.0 ) × 10-3, λ+″ = ( 1.4 ± 0.7 ± 0.4 ) × 10-3 for a quadratic fit. © 2006 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.