A
bstract
Using 15
.
6 fb
−
1
of
e
+
e
−
collision data collected at twenty-four center-of-mass energies from 4
.
0 to 4
.
6 GeV with the BESIII detector, the helicity amplitudes of the process
e
+
e
...−
→
π
+
π
−
ω
are analyzed for the first time. Born cross section measurements of two-body intermediate resonance states with statistical significance greater than 5
σ
are presented, such as
f
0
(500),
f
0
(980),
f
2
(1270),
f
0
(1370),
b
1
(1235)
±
, and
ρ
(1450)
±
. In addition, evidence of a resonance state in
e
+
e
−
→
π
+
π
−
ω
production is found. The mass of this state obtained by line shape fitting is about 4
.
2 GeV/
c
2
, which is consistent with the production of
ψ
(4160) or
Y
(4220).
Helicity amplitude analysis of χcJ→ ϕϕ Balossino, I.; Bettoni, D.; Chen, G. ...
The journal of high energy physics,
05/2023, Volume:
2023, Issue:
5
Journal Article
Peer reviewed
Open access
A
bstract
Using (447.9
±
2.3) million
ψ
(3686) events collected with the BESIII detector, the decays of
χ
cJ
→ ϕϕ
(
J
= 0
,
1
,
2) have been studied via the decay
ψ
(3686)
→ γχ
cJ
. The branching ...fractions of the decays
χ
cJ
→ ϕϕ
(
J
= 0
,
1
,
2) are determined to be (8
.
59 ± 0
.
27 ± 0
.
20) × 10
−
4
, (4
.
26 ± 0
.
13 ± 0
.
15) × 10
−
4
, and (12
.
67 ± 0
.
28 ± 0
.
33) × 10
−
4
, respectively, which are the most precise measurements to date. From a helicity amplitude analysis of the process
ψ
(3686)
→ γχ
cJ
, χ
cJ
→ ϕϕ, ϕ → K
+
K
−
, the polarization parameters of the
χ
cJ
→ ϕϕ
decays are determined for the first time.
A
bstract
Using (448
.
1
±
2
.
9)
×
10
6
ψ
(3686) events collected with the BESIII detector at the BEPCII collider, the decay
ψ
(3686)
→
Σ
−
Σ
¯
+
is observed for the first time with a branching ...fraction of (2
.
82
±
0
.
04
stat
.
±
0
.
08
syst
.
)
×
10
−
4
, and the angular parameter
α
Σ
−
is measured to be 0
.
96
±
0
.
09
stat
.
±
0
.
03
syst
.
.
By analyzing an electron-positron collision data sample corresponding to an integrated luminosity of 2.93 fb(-1) taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we obtain ...for the first time the absolute branching fractions for seven D-0 and D+ hadronic decay modes and search for the hadronic decay D-0 ->(KSKS0)-K-0 pi(0) with much improved sensitivity. The results are B(D-0 -> KS0 pi 0 pi 0 pi 0)=(7.64 +/- 0.30 +/- 0.29)x10(-3), B(D-0 -> K-pi(+)pi(0)pi(0)pi(0))=(9.54 +/- 0.30 +/- 0.31)x10(-3), B(D-0 -> KS0 pi+pi-pi 0 pi 0)=(12.66 +/- 0.45 +/- 0.43)x10(-3), B(D+-> K-S(0)pi+pi(0)pi(0))=(29.04 +/- 0.62 +/- 0.87)x10(-3), B(D+-> K-S(0)pi+pi+pi-pi(0))=(15.28 +/- 0.57 +/- 0.60)x10(-3), B(D+-> K-S(0)pi+pi(0)pi(0)pi(0))=(5.54 +/- 0.44 +/- 0.32)x10(-3), B(D+-> K-pi+pi+pi(0)pi(0))=(4.95 +/- 0.26 +/- 0.19)x10(-3), and B(D-0 ->(KSKS0)-K-0 pi(0))<1.45x10-4 at the 90% confidence level. Here, the first uncertainties are statistical, and the second ones are systematic. The newly studied decays greatly enrich the knowledge of the D -> <(K)over bar>pi pi pi and D -> (K) over bar pi pi pi pi hadronic decays and open a bridge to access more two-body hadronic D decays containing scalar, vector, axial, and tensor mesons in the charm sector.
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A
bstract
Using data samples with an integrated luminosity of 19 fb
−
1
at twenty-eight center-of-mass energies from 3.872 GeV to 4.700 GeV collected with the BESIII detector at the BEPCII ...electron-positron collider, the process
e
+
e
−
→
ηπ
+
π
−
and the intermediate process
e
+
e
−
→
ηρ
0
are studied for the first time. The Born cross sections are measured. No significant resonance structure is observed in the cross section lineshape.
The rare decay η ′ → π+ π− e+ e− is studied using a sample of 1.3 × 109 J / ψ events collected with the BESIII detector at BEPCII in 2009 and 2012. The branching fraction is measured with improved ...precision to be ( 2.42 ± 0.0 5stat ± 0.0 8syst) × 10−3. Due to the inclusion of new data, this result supersedes the last BESIII result on this branching fraction. In addition, the C P -violating asymmetry in the angle between the decay planes of the π+π− -pair and the e+e− -pair is investigated. A measurable value would indicate physics beyond the standard model; the result is ACP = ( 2.9 ± 3. 7stat ± 1. 1syst) % , which is consistent with the standard model expectation of no C P -violation. The precision is comparable to the asymmetry measurement in the K0L → π+π− e+e− decay where the observed (14 ± 2) % effect is driven by a standard model mechanism.
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The Born cross sections of e+e−→Σ0Σ¯0 are measured at center-of-mass energies from 2.3864 to 3.0200 GeV using data samples with an integrated luminosity of 328.5 pb−1 collected with the BESIII ...detector operating at the BEPCII collider. The analysis makes use of a novel reconstruction method for energies near production threshold, while a single-tag method is employed at other center-of-mass energies. The measured cross sections are consistent with earlier results from BaBar, with a substantially improved precision. The cross-section lineshape can be well described by a perturbative QCD-driven energy function. In addition, the effective form factors of the Σ0 baryon are determined. The results provide precise experimental input for testing various theoretical predictions.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The decay $D^+_s$ → $π^+π^+π^-η$ is observed for the first time, using e+e- collision data corresponding to an integrated luminosity of 6.32 fb-1 collected by the BESIII detector at center-of-mass ...energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be $\mathscr{B}$($D^+_s$ → $π^+π^+π^-η$) = (3.12 ± 0.13stat ± 0.90syst)%. The first amplitude analysis of this decay reveals the substructures in $D^+_s$ → $π^+π^+π^-η$ nd determines the relative fractions and the phases among these substructures. The dominant intermediate process is $D^+_s$ → $a_1$(1260)+$η,a_1$(1260)+ → ρ(770)0$π^+$ with a branching fraction of (1.73 ± 0.14stat ±0.08syst)%. We also observe the W-annihilation process $D^+_s$ → $a_0$(980)+ ρ(770)0, $a_0$(980)+ → $π^+η$ with a branching fraction of (0.21 ± 0.08stat ± 0.05syst)%, which is larger than the branching fractions of other measured pure W-annihilation decays by 1 order of magnitude.
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