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Combined limit on the production of a light gauge boson decaying into μ+μ− and π+π−. / The KLOE-2 Collaboration.
в: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Том 784, 10.09.2018, стр. 336-341.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Combined limit on the production of a light gauge boson decaying into μ+μ− and π+π−
AU - The KLOE-2 Collaboration
AU - Anastasi, A.
AU - Babusci, D.
AU - Berlowski, M.
AU - Bloise, C.
AU - Bossi, F.
AU - Branchini, P.
AU - Budano, A.
AU - Cao, B.
AU - Ceradini, F.
AU - Ciambrone, P.
AU - Curciarello, F.
AU - Czerwiński, E.
AU - D'Agostini, G.
AU - Danè, E.
AU - De Leo, V.
AU - De Lucia, E.
AU - De Santis, A.
AU - De Simone, P.
AU - Di Cicco, A.
AU - Di Domenico, A.
AU - Domenici, D.
AU - D'Uffizi, A.
AU - Fantini, A.
AU - Fantini, G.
AU - Fermani, P.
AU - Fiore, S.
AU - Gajos, A.
AU - Gauzzi, P.
AU - Giovannella, S.
AU - Graziani, E.
AU - Ivanov, V. L.
AU - Johansson, T.
AU - Kang, X.
AU - Kisielewska-Kamińska, D.
AU - Kozyrev, E. A.
AU - Krzemien, W.
AU - Kupsc, A.
AU - Lukin, P. A.
AU - Mandaglio, G.
AU - Martini, M.
AU - Messi, R.
AU - Miscetti, S.
AU - Moricciani, D.
AU - Moskal, P.
AU - Passeri, A.
AU - Patera, V.
AU - Perez del Rio, E.
AU - Raha, N.
AU - Santangelo, P.
AU - Solodov, E. P.
N1 - Publisher Copyright: © 2018 The Author(s)
PY - 2018/9/10
Y1 - 2018/9/10
N2 - We searched for the μ+μ− decay of a light vector gauge boson, also known as dark photon, in the e+e−→μ+μ−γISR process by means of the Initial State Radiation (ISR) method. We used 1.93 fb−1 of data collected by the KLOE experiment at the DAΦNE ϕ-factory. No structures have been observed over the irreducible μ+μ− background. A 90% CL limit on the ratio ε2=α′/α between the dark coupling constant and the fine structure constant of 3×10−6–2×10−7 has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e+e−→π+π−γISR events. The combined 90% CL limit increases the sensitivity especially in the ρ–ω interference region and excludes ε2 greater than (13−2)×10−7. For dark photon masses greater than 600 MeV the combined limit is lower than 8 ×10−7 resulting more stringent than present constraints from other experiments.
AB - We searched for the μ+μ− decay of a light vector gauge boson, also known as dark photon, in the e+e−→μ+μ−γISR process by means of the Initial State Radiation (ISR) method. We used 1.93 fb−1 of data collected by the KLOE experiment at the DAΦNE ϕ-factory. No structures have been observed over the irreducible μ+μ− background. A 90% CL limit on the ratio ε2=α′/α between the dark coupling constant and the fine structure constant of 3×10−6–2×10−7 has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e+e−→π+π−γISR events. The combined 90% CL limit increases the sensitivity especially in the ρ–ω interference region and excludes ε2 greater than (13−2)×10−7. For dark photon masses greater than 600 MeV the combined limit is lower than 8 ×10−7 resulting more stringent than present constraints from other experiments.
KW - Dark forces
KW - ee Collisions
KW - Gauge vector boson
KW - Upper limits
KW - SEARCH
KW - DETECTOR
KW - DARK PHOTON
KW - E(+)E(-)
KW - U-GAMMA
KW - e(+) e(-) Collisions
KW - PHI-MESON DECAYS
KW - VECTOR BOSON
KW - TO-LEADING ORDER
KW - KLOE EXPERIMENT
KW - RADIATIVE RETURN
UR - http://www.scopus.com/inward/record.url?scp=85052117389&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2018.08.012
DO - 10.1016/j.physletb.2018.08.012
M3 - Article
AN - SCOPUS:85052117389
VL - 784
SP - 336
EP - 341
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -
ID: 16238560