We search for a light Higgs boson A0 in the fully reconstructed decay chain of J/ψ→γA0, A0→μ+μ− using (225.0±2.8)×106 J/ψ events collected by the BESIII experiment. The A0 is a hypothetical CP-odd light Higgs boson predicted by many extensions of the Standard Model including two spin-0 doublets plus an extra singlet. We find no evidence for A0 production and set 90% confidence-level upper limits on the product branching fraction B(J/ψ→γA0)×B(A0→μ+μ−) in the range of (2.8–495.3)×10−8 for 0.212≤mA0≤3.0 GeV/c2. The new limits are five times below our previous results, and the nature of the A0 is constrained to be mostly singlet.
Search for a light CP -odd Higgs boson in radiative decays of J /ψ
AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, Marco Giovanni Maria;DE MORI, FRANCESCA;GRECO, Michela;HU, Jifeng;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;ZOTTI, LAURA;
2016-01-01
Abstract
We search for a light Higgs boson A0 in the fully reconstructed decay chain of J/ψ→γA0, A0→μ+μ− using (225.0±2.8)×106 J/ψ events collected by the BESIII experiment. The A0 is a hypothetical CP-odd light Higgs boson predicted by many extensions of the Standard Model including two spin-0 doublets plus an extra singlet. We find no evidence for A0 production and set 90% confidence-level upper limits on the product branching fraction B(J/ψ→γA0)×B(A0→μ+μ−) in the range of (2.8–495.3)×10−8 for 0.212≤mA0≤3.0 GeV/c2. The new limits are five times below our previous results, and the nature of the A0 is constrained to be mostly singlet.File | Dimensione | Formato | |
---|---|---|---|
PhysRevD.93.052005.pdf
Accesso aperto
Tipo di file:
PDF EDITORIALE
Dimensione
612.65 kB
Formato
Adobe PDF
|
612.65 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.