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All articles by
Zeng Y. | Zeng Z. | Zeng M. | Zeng Yong | Zeng Bei | Zeng Jiang | Zeng Zhi | Zeng Ming | Zeng Wenjun | Zeng Bin

y | Y J. H. Montes de Oca | Y Farzana | Y Kalidas | Y Ma | y Pavel Trojovsk\' | Y S R K Chaitanya Sharma | Y Vikas Jadhav

Search results


Measurements of $e^+e^-\rightarrow \eta_{\rm c}\pi^+ \pi^-\pi^0$, $\eta_{\rm c}\pi^+ \pi^-$ and $\eta_{\rm c}\pi^0\gamma$ at $\sqrt{s}$ from 4.18 to 4.60 GeV, and search for a $Z_{\rm c}$ state close to the $D\bar{D}$ threshold at 4.23 GeV decaying to $\eta_{\rm c}\pi$

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An M. R., An Q.
27 Oct 2020 hep-ex arxiv.org/abs/2010.14415

We study $\eta_{\rm c}$ production at center-of-mass energies $\sqrt{s}$ from 4.18 to 4.60 GeV in $e^+e^-$ annihilation data collected with the BESIII detector operating at the BEPCII storage ring, corresponding to 7.3 fb$^{-1}$ of integrated luminosity. We measure the cross sections of the three different exclusive reactions $e^+e^-\rightarrow \eta_{\rm c}\pi^+ \pi^-\pi^0$, $e^+e^- \rightarrow \eta_{\rm c}\pi^+ \pi^-$, and $e^+e^- \rightarrow \eta_{\rm c}\pi^0\gamma$. We find significant $\eta_{\rm c}$ production in $e^+e^-\rightarrow \eta_{\rm c}\pi^+ \pi^-\pi^0$ at $\sqrt{s}$ of 4.23 GeV and 4.26 GeV and observe a significant energy-dependent Born cross section that we measure to be consistent with the production via the intermediate $Y(4260)$ resonance. In addition, we perform a search for a charmonium-like $Z_{\rm c}$ state close to the $D\bar{D}$ threshold that decays to $\eta_{\rm c}\pi$, involving ground state charmonium, and observe no signal. Corresponding upper limits on the cross section of $\eta_{\rm c}$ and $Z_{\rm c}$ production are provided, where the yields are not found to be significant.

Search for New Hadronic Decays of $h_c$ and Observation of $h_c\rightarrow K^{+}K^{-}\pi^{+}\pi^{-}\pi^{0}$

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An M. R., An Q.
22 Oct 2020 hep-ex arxiv.org/abs/2010.12092

Ten hadronic final states of the $h_c$ decays are investigated via the process $\psi(3686)\rightarrow \pi^0 h_c$, using a data sample of $(448.1 \pm 2.9) \times 10^6$ $\psi(3686)$ events collected with the BESIII detector. The decay channel $h_c\rightarrow K^{+}K^{-}\pi^{+}\pi^{-}\pi^{0}$ is observed for the first time with a significance of $6.0 \sigma$. The corresponding branching fraction is determined to be $\mathcal{B}(h_c\rightarrow K^{+}K^{-}\pi^{+}\pi^{-}\pi^{0}) =(3.3 \pm 0.6 \pm 0.6)\times 10^{-3}$ (the first uncertainty is statistical and the second systematical). Evidence for the decays $h_c\rightarrow \pi^{+} \pi^{-} \pi^{0} \eta$ and $h_c\rightarrow K^{0}{S}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-}$ is found with a significance of $3.6 \sigma$ and $3.8 \sigma$, respectively. The corresponding branching fractions (and upper limits) are obtained to be $\mathcal{B}(h_c\rightarrow \pi^{+} \pi^{-} \pi^{0} \eta ) =(7.2 \pm 1.8 \pm 1.3)\times 10^{-3}$ $(< 1.8 \times 10^{-2})$ and $\mathcal{B}(h_c\rightarrow K^{0}{S}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-}) =(2.8 \pm 0.9 \pm 0.5)\times 10^{-3}$ $(<4.7\times 10^{-3})$. Upper limits on the branching fractions for the final states $h_c \rightarrow K^{+}K^{-}\pi^{0}$, $K^{+}K^{-}\eta$, $K^{+}K^{-}\pi^{+}\pi^{-}\eta$, $2(K^{+}K^{-})\pi^{0}$, $K^{+}K^{-}\pi^{0}\eta$, $K^{0}_{S}K^{\pm}\pi^{\mp}$, and $p\bar{p}\pi^{0}\pi^{0}$ are determined at a confidence level of 90\%.

Measurement of cross-section for $e^+e^-\to\Xi^-\bar{\Xi}^+$ near threshold at BESIII

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An M. R., An Q.
16 Oct 2020 hep-ex arxiv.org/abs/2010.08320

The Born cross-sections and effective form factors for process $e^+e^-\to\Xi^-\bar{\Xi}^+$ are measured at eight center-of-mass energies between 2.644 and 3.080 GeV, using a total integrated luminosity of 363.9 pb$^{-1}$ $e^+e^-$ collision data collected with the BESIII detector at BEPCII. After performing a fit to the Born cross-section of $e^+e^-\to\Xi^-\bar{\Xi}^+$, no significant threshold effect is observed.

Study of BESIII Trigger Efficiencies with the 2018 $J/\psi$ Data

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Amoroso A., An Q., Anita , Bai Y.
24 Sep 2020 hep-ex arxiv.org/abs/2009.11566

Using a dedicated data sample taken in 2018 on the $J/\psi$ peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha-scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches $100\%$ in most cases with uncertainties small enough as not to affect most physics analyses.

Observation of the decays $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J=0, 1, 2)$

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An M. R., An Q.
19 Sep 2020 hep-ex arxiv.org/abs/2009.09265

The decays $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J = 0, 1, 2)$ are studied via the radiative transition $\psi(3686)\to\gamma\chi_{cJ}$ based on a data sample of $(448.1 \pm 2.9)\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector. The branching fractions of $\chi_{cJ}\to\Sigma^{0}\bar{p}K^{+}+{\rm c.c.}~(J = 0, 1, 2)$ are measured to be $(3.03 \pm 0.12\pm 0.15)\times10^{-4}$, $(1.46 \pm 0.07\pm 0.07)\times10^{-4}$, and $(0.91 \pm 0.06\pm 0.05)\times10^{-4}$, respectively, where the first uncertainties are statistical and the second are systematic. In addition, no evident structure is found for excited baryon resonances on the two-body subsystems with the limited statistics.

Observation of a resonant structure in $e^{+}e^{-} \to \omega\eta$ and another in $e^{+}e^{-} \to \omega\pi^{0}$ at center-of-mass energies between 2.00 and 3.08 GeV

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Amoroso A., An Q., Bai X. H., Bai Y.
17 Sep 2020 hep-ex arxiv.org/abs/2009.08099

Born cross sections for the processes $e^+e^- \to \omega\eta$ and $e^+e^- \to \omega\pi^{0}$ have been determined for center-of-mass energies between 2.00 and 3.08 GeV with the BESIII detector at the BEPCII collider. The results obtained in this work are consistent with previous measurements but with improved precision. Two resonant structures are observed. In the $e^{+}e^{-} \to \omega\eta$ cross sections, a resonance with a mass of $(2179 \pm 21 \pm 3)\text{MeV}/c^2$ and a width of $(89 \pm 28 \pm 5)\text{MeV}$ is observed with a significance of 6.1$\sigma$. Its properties are consistent with the $\phi(2170)$. In the $e^{+}e^{-} \to\omega\pi^{0}$ cross sections, a resonance denoted $Y(2040)$ is observed with a significance of more than 10$\sigma$. Its mass and width are determined to be $(2034 \pm 13 \pm 9)\text{MeV}/c^2$ and $(234 \pm 30 \pm 25)\text{MeV}$, respectively, where the first uncertainties are statistical and the second ones are systematic.

Erratum to "Measurement of the $e^+e^-\to\pi^+\pi^-$ cross section between 600 and 900 MeV using initial state radiation"

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An Q., Bai X. H.
10 Sep 2020 hep-ex arxiv.org/abs/2009.05011

In Phys. Lett. B 753, 629-638 (2016) [arXiv:1507.08188] the BESIII collaboration published a cross section measurement of the process $e^+e^-\to \pi^+ \pi^-$ in the energy range between 600 and 900 MeV. In this erratum we report a corrected evaluation of the statistical errors in terms of a fully propagated covariance matrix. The correction also yields a reduced statistical uncertainty for the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, which now reads as $a_\mu^{\pi\pi\mathrm{, LO}}(600 - 900\,\mathrm{MeV}) = (368.2 \pm 1.5_{\rm stat} \pm 3.3_{\rm syst})\times 10^{-10}$. The central values of the cross section measurement and of $a_\mu^{\pi\pi\mathrm{, LO}}$, as well as the systematic uncertainties remain unchanged.

Measurements of Sigma+ and Sigma- Time-like Electromagnetic Form Factors for center-of-mass energies from 2.3864 to 3.0200 GeV

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An M. R., An Q.
02 Sep 2020 hep-ex arxiv.org/abs/2009.01404

The Born cross sections of the $e^{+}e^{-}\to\Sigma^{+}\bar{\Sigma}^{-}$ and $e^{+}e^{-}\to\Sigma^{-}\bar{\Sigma}^{+}$ processes are determined with high precision for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. Nonzero cross sections near threshold are observed. The resulting ratio of effective form factors for the $\Sigma^{+}$ and $\Sigma^{-}$ is consistent with 3, agreeing with the ratio of the incoherent sum of the squared charges of the $\Sigma^{+}$ and $\Sigma^{-}$ valence quarks, but disagreeing with various theoretical predictions. In addition, ratios of the $\Sigma^{+}$ electric and magnetic form factors, $|G_{E}/G_{M}|$, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed novel features of the $\Sigma^{\pm}$ form factors require a new theoretical description for the hyperons.

Search for the semileptonic decay $D^{0(+)}\to b_1(1235)^{-(0)} e^+\nu_e$

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An Q., Anita
13 Aug 2020 hep-ex arxiv.org/abs/2008.05754

Using $2.93~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at a center-of-mass energy $\sqrt{s}=3.773$ GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic $D^{0(+)}$ decays into a $b_1(1235)^{-(0)}$ axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are ${\mathcal B}{D^0\to b_1(1235)^- e^+\nu_e}\cdot {\mathcal B}{b_1(1235)^-\to \omega\pi^-}<1.12\times 10^{-4}$ and ${\mathcal B}{D^+\to b_1(1235)^0 e^+\nu_e}\cdot {\mathcal B}{b_1(1235)^0\to \omega\pi^0}<1.75\times 10^{-4}$ at the 90\% confidence level.

Measurements of the absolute branching fractions of $D^{0(+)}\to K\bar K\pi\pi$ decays

BESIII Collaboration , Ablikim M., Achasov M. N., Adlarson P., Ahmed S., Albrecht M., Aliberti R., Amoroso A., An Q., Anita
20 Jul 2020 hep-ex arxiv.org/abs/2007.10563

Based on 2.93~fb$^{-1}$ $e^+e^-$ collision data taken at center-of-mass energy of 3.773 GeV by the BESIII detector, we report the measurements of the absolute branching fractions of $D^0\to K^+K^-\pi^0\pi^0$, $D^0\to K^0_SK^0_S\pi^+\pi^-$, $D^0\to K^0_SK^-\pi^+\pi^0$, $D^0\to K^0_SK^+\pi^-\pi^0$, $D^+\to K^+K^-\pi^+\pi^0$, $D^+\to K^0_SK^+\pi^0\pi^0$, $D^+\to K^0_SK^-\pi^+\pi^+$, $D^+\to K^0_SK^+\pi^+\pi^-$, and $D^+\to K^0_SK^0_S\pi^+\pi^0$. The decays $D^0\to K^+K^-\pi^0\pi^0$, $D^0\to K^0_SK^-\pi^+\pi^0$, $D^0\to K^0_SK^+\pi^-\pi^0$, $D^+\to K^0_SK^0_S\pi^+\pi^0$, and $D^+\to K^0_SK^+\pi^0\pi^0$ are observed for the first time. The branching fractions of the decays $D^0\to K^0_SK^0_S\pi^+\pi^-$, $D^+\to K^+K^-\pi^+\pi^0$, $D^+\to K^0_SK^-\pi^+\pi^+$, and $D^+\to K^0_SK^+\pi^+\pi^-$ are measured with improved precision compared to the world-average values.