Measurement of the branching fraction for the decay KS → πμν with the KLOE detector

被引：13

作者：

Babusci, D. ^{[4
]}

Berlowski, M. ^{[22
]}

Bloise, C. ^{[4
]}

Bossi, F. ^{[4
]}

Branchini, R. ^{[19
]}

Budano, A. ^{[18
,19
]}

Cao, B. ^{[21
]}

Ceradini, F. ^{[18
,19
]}

Ciambrone, R. ^{[4
]}

Curciarello, F. ^{[1
,4
]}

Czerwinski, E. ^{[3
]}

D'Agostini, G. ^{[14
,15
]}

Dane, E. ^{[4
]}

De Leo, V ^{[14
,15
]}

De Lucia, E. ^{[4
]}

De Santis, A. ^{[4
]}

De Simone, R. ^{[4
]}

Di Cicco, A. ^{[18
,19
]}

Di Domenico, A. ^{[14
,15
]}

Domenici, D. ^{[4
]}

D'Uffizi, A. ^{[4
]}

Fantini, A. ^{[16
,17
]}

Fermani, R. ^{[4
]}

Fiore, S. ^{[15
,20
]}

Gajos, A. ^{[3
]}

Gauzzi, R. ^{[14
,15
]}

Giovannella, S. ^{[4
]}

Graziani, E. ^{[19
]}

Ivanov, V. L. ^{[7
,8
]}

Johansson, T. ^{[21
]}

Kang, X. ^{[4
]}

Kisielewska-Kaminska, D. ^{[3
]}

Kozyrev, E. A. ^{[7
,8
]}

Krzemien, W. ^{[22
]}

Kupsc, A. ^{[21
]}

Lukin, P. A. ^{[7
,8
]}

Mandaglio, G. ^{[2
,6
]}

Martini, M. ^{[4
,13
]}

Messi, R. ^{[16
,17
]}

Miscetti, S. ^{[4
]}

Moricciani, D. ^{[4
]}

Moskal, R. ^{[3
]}

Parzych, S. ^{[3
]}

Passeri, A. ^{[19
]}

Patera, V ^{[12
,15
]}

del Rio, E. Perez ^{[14
,15
]}

Santangelo, R. ^{[4
]}

Schioppa, M. ^{[10
,11
]}

Selce, A. ^{[18
,19
]}

Silarski, M. ^{[3
]}

机构：

[1] Univ Catania, Dipartimento Fis & Astron Ettore Majorana, Catania, Italy

[2] INFN, Sez Catania, Catania, Italy

[3] Jagiellonian Univ, Inst Phys, Krakow, Poland

[4] INFN, Lab Nazl Frascati, Frascati, Italy

[5] Horia Hulubei Natl Inst Phys & Nucl Engn, Magurele, Romania

[6] Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy

[7] Budker Inst Nucl Phys, Novosibirsk, Russia

[8] Novosibirsk State Univ, Novosibirsk, Russia

[9] INFN, Sez Pisa, Pisa, Italy

[10] Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy

[11] INFN, Grp Collegato Cosenza, Arcavacata Di Rende, Italy

[12] Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy

[13] Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy

[14] Univ Sapienza, Dipartimento Fis, Rome, Italy

[15] INFN, Sez Roma, Rome, Italy

[16] Univ Tor Vergata, Dipartimento Fis, Rome, Italy

[17] INFN, Sez Roma Tor Vergata, Rome, Italy

[18] Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy

[19] INFN, Sez Roma Tre, Rome, Italy

[20] ENEA, Dept Fus & Technol Nucl Safety & Secur, Frascati, RM, Italy

[21] Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden

[22] Natl Ctr Nucl Res, Warsaw, Poland

来源：

PHYSICS LETTERS B | 2020年 / 804卷

关键词：

e(+)e(-) collisions; K-0; meson; Semileptonic decay; RADIATIVE-CORRECTIONS; V-US;

D O I：

10.1016/j.physletb.2020.135378

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Based on a sample of 300 million K-S mesons produced in phi -> KLKS decays recorded by the KLOE experiment at the DA Phi NE e(+)e(-) collider we have measured the branching fraction for the decay K-S -> pi mu nu. The K-S mesons are identified by the interaction of K-L mesons in the detector. The K-S -> pi mu nu decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of K-L -> pi mu nu decays. A fit to the reconstructed muon mass distribution finds 7223 +/- 180 signal events. Normalising to the K-S -> pi(+)pi(-) decay events the result for the branching fraction is B(K-S -> pi mu nu) = (4.56 +/- 0.11(stat) +/- 0.17(syst)) x 10(-4). It is the first measurement of this decay mode and the result allows an independent determination of vertical bar V-us vertical bar and a test of the lepton-flavour universality. (c) 2020 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

引用

页数：8

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