Measurement of Kμ30 form factors

6533b7d3fe1ef96bd126090c

RESEARCH PRODUCT

Measurement of Kμ30 form factors

M. Sozzi P. Debu M. Cirilli G. Fischer S. A. Wotton Konrad Kleinknecht H. D. Wahl E. Iacopini H.g. Becker P. Grafström P. Lubrano B. Peyaud Anton Taurok M. Eppard A. Winhart Nadia Pastrone Benedetto Gorini Cristina Biino Ivan Mikulec J. C. Chollet V. Kekelidze S.a. Schmidt I.g. Knowles B. Vallage Milene Calvetti Manfred Jeitler I. Wingerter-seez H. Taureg S. Wronka H. Fox R. Turlay M. Wittgen A. Lacourt J. Cogan A. Kalter A. Gonidec M. Markytan H. Dibon T.o. White G. Unal G. Collazuol J. Duclos G. Anzivino A. Peters Adrian John Bevan E. Rondio J. Ocariz G. Graziani G.d. Barr C. Cheshkov R. Fantechi I. Mannelli L. Gatignon T.j. Gershon Roberta Arcidiacono Andrea Bizzeti M. Lenti B. Renk G. Bocquet Wojciech Wislicki B. Panzer-steindel D. Madigozhin R. Casali M. De Beer J.b. Cheze U. Koch A. Nappi V. Falaleev M. Piccini Michael Ziolkowski M. Contalbrigo A. Zinchenko Alexi Mestvirishvili Louis Fayard T. Cuhadar-dönszelmann R. Wanke R.s. Dosanjh R. Bernhard N. Doble L. Widhalm Cristina Lazzeroni A. Ceccucci S. Stoynev M. Martini B. Hay A. Maier P. Hristov A. Lai I. Pellmann S. Giudici Andrea Formica Giuseppe Ruggiero D.j. Munday Michal Szleper A. Norton J. Nassalski L. Köpke C. Cerri E. Imbergamo M. Pernicka M. Savrie E. Menichetti F. Costantini M. Pepe G.e. Kalmus G. D'agostini G. Govi Nicolo Cartiglia P. Cenci Michael Andrew Parker W. Kubischta P. F. Dalpiaz V. Schönharting M. Holder M. Veltri G.m. Pierazzini P. Lopes Da Silva Lydia Iconomidou-fayard P. Marouelli L. Bertanza G. Neuhofer R. Carosi D.c. Cundy Y. Schué R. Sacco A. Gianoli R. Granier De Cassagnac E. Olaiya Yu. Potrebenikov E. Mazzucato F. Petrucci Victoria Jane Martin Mayda Velasco Sandro Palestini F. Marchetto N. A. Molokanova K. Eppard Leander Litov P.l. Frabetti Alan W. Walker D. Marras

subject

Nuclear physics Physics Nuclear and High Energy Physics 010308 nuclear & particles physics 0103 physical sciences Form factor (quantum field theory)Dalitz plot NA48 experiment 010306 general physics 01 natural sciences

description

Abstract This Letter reports on a new high precision measurement of the form factors of the K L → π ± μ ∓ ν μ decay. The data sample of about 2.3 × 10 6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, λ + ′ = ( 20.5 ± 2.2 stat ± 2.4 syst ) × 10 −3 , and a quadratic, λ + ″ = ( 2.6 ± 0.9 stat ± 1.0 syst ) × 10 −3 term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ 0 = ( 9.5 ± 1.1 stat ± 0.8 syst ) × 10 −3 . Using a linear fit our results were: λ + = ( 26.7 ± 0.6 stat ± 0.8 syst ) × 10 −3 and λ 0 = ( 11.7 ± 0.7 stat ± 1.0 syst ) × 10 −3 . A pole fit of the form factors yields: m V = ( 905 ± 9 stat ± 17 syst ) MeV / c 2 and m S = ( 1400 ± 46 stat ± 53 syst ) MeV / c 2 .

year	journal	country	edition	language
2007-04-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2007.02.039