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1. chinaXiv:201608.00179 [pdf]

Amplitude analysis of the decays $\eta^\prime\rightarrow\pi^+\pi^-\pi^0$ and $\eta^\prime\rightarrow\pi^0\pi^0\pi^0$

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

Based on a sample of?1.31×109?J/ψ?events collected with the BESIII detector, an amplitude analysis of the isospin violating decays?η′→π+π?π0?and?η′→π0π0π0?is performed. Significant?P-wave contribution from?η′→ρ±π??is observed for the first time in?η′→π+π?π0. The branching fraction is determined to be?B(η′→ρ±π?)=(7.44±0.60±1.26±1.84)×10?4, where the first uncertainty is statistical, the second systematic and the third model dependent. In addition to the non-resonant?S-wave component, a contribution from the?σ?meson is also essential. The branching fractions of the?S-wave components are determined as?B(η′→π+π?π0)S=(37.63±0.77±2.22±4.48)×10?4?and?B(η′→π0π0π0)=(35.22±0.82±2.60)×10?4, respectively. The latter one is consistent with previous BESIII measurements.

submitted time 2016-08-29 Hits376Downloads223 Comment 0

2. chinaXiv:201608.00135 [pdf]

Observation of $e^+e^- \to \eta^\prime J/\psi$ at center-of-mass energies between 4.189 and 4.600 GeV

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

The process?e+e?→η′J/ψ?is observed for the first time with a statistical significance of?8.6σ?at center-of-mass energy?s√=4.226?GeV and?7.3σ?at?s√=4.258?GeV using data samples collected with the BESIII detector. The Born cross sections are measured to be?(3.7±0.7±0.3)?and?(3.9±0.8±0.3)?pb at?s√=4.226?and?4.258?GeV, respectively, where the first errors are statistical and the second systematic. Upper limits at the 90% confidence level of the Born cross sections are also reported at other 12 energy points

submitted time 2016-08-25 Hits403Downloads252 Comment 0

3. chinaXiv:201608.00131 [pdf]

Measurement of the absolute branching fraction of $D^+\rightarrow\bar K^0 e^+\nu_e$ via $\bar K^0\to\pi^0\pi^0$

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

By analyzing 2.93 fb?1?data collected at the center-of-mass energy?s√=3.773?GeV with the BESIII detector, we measure the absolute branching fraction of the semileptonic decay?D+→K?0e+νe?to be?B(D+→K?0e+νe)=(8.59±0.14±0.21)%?using?K?0→K0S→π0π0, where the first uncertainty is statistical and the second systematic. Our result is consistent with previous measurements within uncertainties.

submitted time 2016-08-25 Hits387Downloads243 Comment 0

4. chinaXiv:201608.00129 [pdf]

Improved measurement of the absolute branching fraction of $D^+\rightarrow \bar K^0 \mu^+\nu_\mu$

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

By analyzing 2.93 fb?1?of data collected at?s√=3.773?GeV with the BESIII detector, we measure the absolute branching fraction?B(D+→K?0μ+νμ)=(8.72±0.07stat.±0.18sys.)%, which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of?B(D0→K?μ+νμ),?B(D+→K?0e+νe), and the lifetimes of the?D0?and?D+?mesons with the value of?B(D+→K?0μ+νμ)?measured in this work, we determine the following ratios of partial widths:?Γ(D0→K?μ+νμ)/Γ(D+→K?0μ+νμ)=0.963±0.044?and?Γ(D+→K?0μ+νμ)/Γ(D+→K?0e+νe)=0.988±0.033.

submitted time 2016-08-25 Hits369Downloads206 Comment 0

5. chinaXiv:201608.00113 [pdf]

Measurement of the leptonic decay width of $J/\psi$ using initial state radiation

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

Using a data set of 2.93 fb?1?taken at a center-of-mass energy of?s√?= 3.773 GeV with the BESIII detector at the BEPCII collider, we measure the process?e+e?→J/ψγ→μ+μ?γ?and determine the product of the branching fraction and the electronic width?Bμμ?Γee=(333.4±2.5stat±4.4sys)~eV. Using the earlier-published BESIII result for?Bμμ?= (5.973?±?0.007stat?±?0.037sys)\%, we derive the?J/ψ?electronic width?Γee~= (5.58?±?0.05stat?±?0.08sys) keV.

submitted time 2016-08-24 Hits498Downloads222 Comment 0

6. chinaXiv:201608.00070 [pdf]

Search for the weak decay $\eta^\prime\to K^\pm\pi^\mp$ and precise measurement of the branching fraction $\cal B(J/\psi\to\phi\eta^\prime)$

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

We present the first search for the rare decay of?η′?into?K±π??in?J/ψ→?η′, using a sample of?1.3×109?J/ψ?events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90\% confidence level for the ratio?B(η′→K±π?)B(η′→γπ+π?)?is determined to be?1.3×10?4. In addition, we report the measurement of the branching fraction of?J/ψ→?η′?to be?(5.10±0.03(stat.)±0.32(syst.))×10?4, which agrees with previous results from BESII.

submitted time 2016-08-19 Hits338Downloads187 Comment 0

7. chinaXiv:201608.00068 [pdf]

Study of $\psi$ decays to the $\Xi^-\bar\Xi^+$ and $\Sigma(1385)^\mp\bar\Sigma(1385)^\pm$ final states

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

We study the decays of the charmonium resonances J/ψ and ψ(3686) to the final states Ξ?Ξ?+, Σ(1385)?Σ?(1385)± based on a single baryon tag method using data samples of (223.7±1.4)×106 J/ψ and (106.4±0.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decay ψ(3686)→Σ(1385)?Σ?(1385)± is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with and much more precise than the previously published results. Additionally, the ratios B(ψ(3686)→Ξ?Ξ?+)B(J/ψ→Ξ?Ξ?+), B(ψ(3686)→Σ(1385)?Σ?(1385)+)B(J/ψ→Σ(1385)?Σ?(1385)+) and B(ψ(3686)→Σ(1385)+Σ?(1385)?)B(J/ψ→Σ(1385)+Σ?(1385)?) are determined.

submitted time 2016-08-19 Hits352Downloads213 Comment 0

8. chinaXiv:201608.00050 [pdf]

Observation of pseudoscalar and tensor resonances in $J/\psi\to \gamma \phi \phi$

Ablikim, Medina and others
Subjects: Physics >> Nuclear Physics

Based on a sample of (1310.6±10.5)×106 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γ?? is performed in order to study the intermediate states. Results of the partial wave analysis show that the structures are predominantly 0?+ states. The existence of the η(2225) is confirmed, and its resonance parameters are measured. Two additional pseudoscalar states, the η(2100) with a mass of 2050+30?24+75?26~MeV/c2 and a width of 250+36?30+181?164~MeV/c2 and the X(2500) with a mass of 2470+15?19+101?23~MeV/c2 and a width of 230+64?35+56?33~MeV/c2, are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ→γ??. The product branching fractions B(J/ψ→γX)×B(X→??) are reported.

submitted time 2016-08-17 Hits438Downloads237 Comment 0

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