Search for a feebly interacting particle X in the decay K+ → π+X

被引：0
|
作者：
E. Cortina Gil
A. Kleimenova
E. Minucci
S. Padolski
P. Petrov
A. Shaikhiev
R. Volpe
T. Numao
B. Velghe
D. Bryman
J. Fu
T. Husek
J. Jerhot
K. Kampf
M. Zamkovsky
R. Aliberti
G. Khoriauli
J. Kunze
D. Lomidze
R. Marchevski
L. Peruzzo
M. Vormstein
R. Wanke
P. Dalpiaz
M. Fiorini
I. Neri
A. Norton
F. Petrucci
H. Wahl
A. Cotta Ramusino
A. Gianoli
E. Iacopini
G. Latino
M. Lenti
A. Parenti
A. Bizzeti
F. Bucci
A. Antonelli
G. Georgiev
V. Kozhuharov
G. Lanfranchi
S. Martellotti
M. Moulson
T. Spadaro
F. Ambrosino
T. Capussela
M. Corvino
D. Di Filippo
P. Massarotti
M. Mirra
机构：
[1] Université Catholique de Louvain,Institut für Physik and PRISMA Cluster of excellence
[2] TRIUMF,Instituto de Física
[3] University of British Columbia,Faculty of Mathematics, Physics and Informatics
[4] Charles University,Department of Astronomy and Theoretical Physics
[5] Universität Mainz,Institut für Kernphysik and Helmholtz Institute Mainz
[6] Dipartimento di Fisica e Scienze della Terra dell’Università e INFN,Dipartimento di Fisica
[7] Sezione di Ferrara,Faculty of Physics
[8] INFN,School of Physics and Astronomy
[9] Sezione di Ferrara,Institut am Fachbereich Informatik und Mathematik
[10] Dipartimento di Fisica e Astronomia dell’Università e INFN,Department of Industrial Engineering
[11] Sezione di Firenze,Department of Electronic Engineering
[12] INFN,Physics Department
[13] Sezione di Firenze,Department of Physics
[14] Laboratori Nazionali di Frascati,Department of Physics
[15] Dipartimento di Fisica “Ettore Pancini” e INFN,Dipartimento di Psicologia
[16] Sezione di Napoli,SLAC National Accelerator Laboratory
[17] Dipartimento di Fisica e Geologia dell’Università e INFN,undefined
[18] Sezione di Perugia,undefined
[19] INFN,undefined
[20] Sezione di Perugia,undefined
[21] Dipartimento di Fisica dell’Università e INFN,undefined
[22] Sezione di Pisa,undefined
[23] INFN,undefined
[24] Sezione di Pisa,undefined
[25] Scuola Normale Superiore e INFN,undefined
[26] Sezione di Pisa,undefined
[27] Dipartimento di Fisica,undefined
[28] Sapienza Università di Roma e INFN,undefined
[29] Sezione di Roma I,undefined
[30] INFN,undefined
[31] Sezione di Roma I,undefined
[32] INFN,undefined
[33] Sezione di Roma Tor Vergata,undefined
[34] Dipartimento di Fisica dell’Università e INFN,undefined
[35] Sezione di Torino,undefined
[36] INFN,undefined
[37] Sezione di Torino,undefined
[38] Universidad Autónoma de San Luis Potosí,undefined
[39] Horia Hulubei National Institute of Physics for R&D in Physics and Nuclear Engineering,undefined
[40] Joint Institute for Nuclear Research,undefined
[41] Institute for Nuclear Research of the Russian Academy of Sciences,undefined
[42] Institute for High Energy Physics - State Research Center of Russian Federation,undefined
[43] Comenius University,undefined
[44] CERN,undefined
[45] European Organization for Nuclear Research,undefined
[46] University of Birmingham,undefined
[47] University of Bristol,undefined
[48] University of Glasgow,undefined
[49] University of Lancaster,undefined
[50] University of Liverpool,undefined
来源：
Journal of High Energy Physics | / 2021卷
关键词：
Beyond Standard Model; Exotics; Fixed target experiments;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ → π+νν¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\pi}^{+}\nu \overline{\nu} $$\end{document} analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c2 and 154–260 MeV/c2, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K+ → π+X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.
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