Search for di-muon decays of a low-mass Higgs boson in radiative decays of the \Upsilon(1S)
J.P. Lees
(1)
,
V. Poireau
(1)
,
V. Tisserand
(1)
,
D. Bernard
(2)
,
M. Verderi
(2)
,
S. Emery
(3)
,
G. Hamel de Monchenault
(3)
,
G. Vasseur
(3)
,
Ch. Yèche
(3)
,
S. Akar
(4)
,
E. Ben-Haim
(4)
,
M. Bomben
(4)
,
G.R. Bonneaud
(4)
,
H. Briand
(4)
,
G. Calderini
(4)
,
J. Chauvau
(4)
,
O. Hamon
(4)
,
Ph. Leruste
(4)
,
G. Marchiori
(4)
,
J. Ocariz
(4)
,
S. Sitt
(4)
,
N. Arnaud
(5)
,
M. Davier
(5)
,
D. Derkach
(5)
,
G. Grosdidier
(5)
,
F. Le Diberder
(5)
,
A.M. Lutz
(5)
,
B. Malaescu
(5)
,
P. Roudeau
(5)
,
M.H. Schune
(5)
,
A. Stocchi
(5)
,
G. Wormser
(5)
G. Vasseur
- Function : Author
- PersonId : 745439
- IdHAL : georges-vasseur
E. Ben-Haim
- Function : Author
- PersonId : 1444626
- IdRef : 090175859
M. Bomben
- Function : Author
- PersonId : 1380362
- ORCID : 0000-0002-9807-861X
- IdRef : 242005462
G. Calderini
- Function : Author
- PersonId : 10608
- IdHAL : giovanni-calderini
- ORCID : 0000-0002-9495-9145
- IdRef : 172243211
G. Marchiori
- Function : Author
- PersonId : 741274
- IdHAL : giovanni-marchiori
- ORCID : 0000-0003-2655-7643
- IdRef : 180997203
N. Arnaud
- Function : Author
- PersonId : 16841
- IdHAL : nicolas-arnaud
- ORCID : 0000-0001-6589-8673
Abstract
We search for di-muon decays of a low-mass Higgs boson (A^0) produced in radiative \Upsilon(1S) decays. The \Upsilon(1S) sample is selected by tagging the pion pair in the \Upsilon(2S, 3S) \to \pi^+ \pi^- \Upsilon(1S) transitions, using a data sample of 92.8 \times 10^6 \Upsilon(2S) and 116.8 \times 10^6 \Upsilon(3S) events collected by the \babar\ detector. We find no evidence for A^0 production and set 90% confidence level upper limits on the product branching fraction \mathcal{B} (\Upsilon(1S) \to \gamma A^0) \times \mathcal{B} (A^0 \to \mumu) in the range of (0.28 - 9.7) \times 10^{-6} for 0.212 \le m_{A^0} \le 9.20 GeV/c^2. The results are combined with our previous measurements of \Upsilon(2S,3S) \to \gamma A^0, A^0 \to \mumu to set limits on the effective coupling of the \b-quark to the A^0.