/ Experiment-HEP arXiv:1101.4805


Test of Lepton Flavour Universality in $K^+ -> l^+\nu$ Decays


Lazzeroni, C (Birmingham U.) ; Romano, A (Birmingham U.) ; Ceccucci, A (CERN) ; Danielsson, H (CERN) ; Falaleev, V (CERN) ; Gatignon, L (CERN) ; Goy Lopez, S (CERN) ; Hallgren, B (CERN) ; Maier, A (CERN) ; Peters, A (CERN) ; Piccini, M (CERN) ; Riedler, P (CERN) ; Dyulendarova, M (Dubna, JINR) ; Frabetti, P L (Dubna, JINR) ; Kekelidze, V (Dubna, JINR) ; Madigozhin, D (Dubna, JINR) ; Marinova, E (Dubna, JINR) ; Molokanova, N (Dubna, JINR) ; Movchan, S (Dubna, JINR) ; Potrebenikov, Yu (Dubna, JINR) ; Shkarovskiy, S (Dubna, JINR) ; Zinchenko, A (Dubna, JINR) ; Rubin, P (George Mason U.) ; Baldini, W (Ferrara U.) ; Cotta Ramusino, A (Ferrara U.) ; Dalpiaz, P (Ferrara U.) ; Fiorini, M (Ferrara U.) ; Gianoli, A (Ferrara U.) ; Norton, A (Ferrara U.) ; Petrucci, F (Ferrara U.) ; Savrie, M (Ferrara U.) ; Wahl, H (Ferrara U.) ; Bizzeti, A (INFN, Florence) ; Bucci, F (INFN, Florence) ; Iacopini, E (INFN, Florence) ; Lenti, M (INFN, Florence) ; Veltri, M (INFN, Florence) ; Antonelli, A (Frascati) ; Moulson, M (Frascati) ; Raggi, M (Frascati) ; Spadaro, T (Frascati) ; Eppard, K (Mainz U.) ; Hita-Hochgesand, M (Mainz U.) ; Kleinknecht, K (Mainz U.) ; Renk, B (Mainz U.) ; Wanke, R (Mainz U.) ; Winhart, A (Mainz U.) ; Winston, R (UC, Merced) ; Bolotov, V (Moscow, INR) ; Duk, V (Moscow, INR) ; Gushchin, E (Moscow, INR) ; Ambrosino, F (Naples U.) ; Di Filippo, D (Naples U.) ; Massarotti, P (Naples U.) ; Napolitano, M (Naples U.) ; Palladino, V (Naples U.) ; Saracino, G (Naples U.) ; Anzivino, G (Perugia U.) ; Imbergamo, E (Perugia U.) ; Piandani, R (Perugia U.) ; Sergi, A (Perugia U.) ; Cenci, P (INFN, Perugia) ; Pepe, M (INFN, Perugia) ; Costantini, F (Pisa U.) ; Doble, N (Pisa U.) ; Giudici, S (Pisa U.) ; Pierazzini, G (Pisa U.) ; Sozzi, M (Pisa U.) ; Venditti, S (Pisa U.) ; Balev, S (Pisa, Scuola Normale Superiore) ; Collazuol, G (Pisa, Scuola Normale Superiore) ; DiLella, L (Pisa, Scuola Normale Superiore) ; Gallorini, S (Pisa, Scuola Normale Superiore) ; Goudzovski, E (Pisa, Scuola Normale Superiore) ; Lamanna, G (Pisa, Scuola Normale Superiore) ; Mannelli, I (Pisa, Scuola Normale Superiore) ; Ruggier, G (Pisa, Scuola Normale Superiore) ; Cerri, C (INFN, Pisa) ; Fantechi, R (INFN, Pisa) ; Kurshetsov, V (Serpukhov, IHEP) ; Obraztsov, V (Serpukhov, IHEP) ; Popov, I (Serpukhov, IHEP) ; Semenov, V (Serpukhov, IHEP) ; Yushchenko, O (Serpukhov, IHEP) ; DAgostini, G (INFN, Rome) ; Leonardi, E (INFN, Rome) ; Serra, M (INFN, Rome) ; Valente, P (INFN, Rome) ; Fucci, A (INFN, Rome2) ; Salamon, A (INFN, Rome2) ; Bloch-Devaux, B (Saclay) ; Peyaud, B (Saclay) ; Engelfried, J (San Luis Potosi U.) ; Coward, D (Stanford U.) ; Kozhuharov, V (Sofiya U.) ; Litov, L (Sofiya U.) ; Arcidiacono, R (Turin U.) ; Bifani, S (Turin U.) ; Biino, C (Turin U.) ; Dellacasa, G (Turin U.) ; Marchetto, F (Turin U.) ; Numao, T (TRIUMF) ; Retiere, F (TRIUMF)

Pages: 16

Abstract: A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ --> e+nu and K+ --> mu+nu in a sample of 59813 reconstructed K+ --> e+nu candidates with (8.71 +- 0.24)% background contamination. The result RK = (2.487 +- 0.013) * 10^{-5} is in agreement with the Standard Model expectation.

Total numbers of views: 1409
Numbers of unique views: 642
 Record created 2011-03-17, last modified 2014-01-30



Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)