TY - JOUR
T1 - Search for long-lived scalar particles in B + → K + χ ( μ + μ − ) decays
AU - Appleby, Robert
AU - Babuschkin, Igor
AU - Barlow, Roger
AU - Bird, Thomas
AU - Bitadze, Alexander
AU - Borghi, Silvia
AU - Brodzicka, Jolanta
AU - Burr, Christopher
AU - Capriotti, Lorenzo
AU - Chen, Shun
AU - De Capua, Stefano
AU - Dujany, Giulio
AU - Gersabeck, Marco
AU - Harrison, Jonathan
AU - Hombach, Christoph
AU - Klaver, Suzanne
AU - Lafferty, George
AU - Maguire, Kevin
AU - Mcnab, Andrew
AU - Muller, D
AU - Parkes, Christopher
AU - Rodriguez Perez, Pablo
AU - LHCb Collaboration
PY - 2017/4/14
Y1 - 2017/4/14
N2 - A search for a long-lived scalar particle
χ
is performed, looking for the decay
B
+
→
K
+
χ
with
χ
→
μ
+
μ
−
in
p
p
collision data corresponding to an integrated luminosity of
3
fb
−
1
, collected by the LHCb experiment at center-of-mass energies of
√
s
=
7
and 8 TeV. This new scalar particle, predicted by hidden sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass
250
<
m
(
χ
)
<
4700
MeV
/
c
2
and lifetime
0.1
<
τ
(
χ
)
<
1000
ps
. Upper limits on the branching fraction
B
(
B
+
→
K
+
χ
(
μ
+
μ
−
)
)
at 95% confidence level are set as a function of
m
(
χ
)
and
τ
(
χ
)
, varying between
2
×
10
−
10
and
10
−
7
. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle
AB - A search for a long-lived scalar particle
χ
is performed, looking for the decay
B
+
→
K
+
χ
with
χ
→
μ
+
μ
−
in
p
p
collision data corresponding to an integrated luminosity of
3
fb
−
1
, collected by the LHCb experiment at center-of-mass energies of
√
s
=
7
and 8 TeV. This new scalar particle, predicted by hidden sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass
250
<
m
(
χ
)
<
4700
MeV
/
c
2
and lifetime
0.1
<
τ
(
χ
)
<
1000
ps
. Upper limits on the branching fraction
B
(
B
+
→
K
+
χ
(
μ
+
μ
−
)
)
at 95% confidence level are set as a function of
m
(
χ
)
and
τ
(
χ
)
, varying between
2
×
10
−
10
and
10
−
7
. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle
U2 - 10.1103/PhysRevD.95.071101
DO - 10.1103/PhysRevD.95.071101
M3 - Article
SN - 1550-7998
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
ER -