Lianjin Wu
BESIII experiment has collected about 20 fb$^{-1}$ luminosity data between $\sqrt{s}=3.8$ and 4.7 GeV via $e^{+}e^{-}$ collision. In this talk, we present the recent $XYZ$ results at BESIII, including mass and width measurements of $Y(4220)$, search for $Y$ states with rare decay modes, isospin parity determination of $Z_{c}^{0}(3900)$ as well as the mass and width determination, and search for new decay modes of $X(3872)$.
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Many unexpected charmonium-like states have recently been observed above the $D\overline{D}$ threshold, which features can't be explained by the conventional quark models. These states are known as XYZ mesons. The study of the radiative transition among these states can provide the important features of XYZ states. This study has recently been performed by the BESIII using the large data samples collected at different center-of-mass energies above 3.8 GeV. This report summarizes the recent results of XYZ radiative transitions at BESIII.
With the ability to run above 4~GeV, the BESIII experiment located in the Beijing Electron Positron Collider (BEPCII), has becoming a pioneer in searching and studying charmoniumlike states ($XYZ$ particles). In 2013, BESIII Collaboration discovered a charged charmoniumlike state $Z_c(3900)$, which is confirmed immediately experimentally, and provides the best candidate for a four quark state by now. Continuous studies by BESIII Collaboration show new decay behavior of $Z_c(3900)$, and there are possible partner particle $Z_c(4020)/Z_c(4025)$ existing. By scanning above 4~GeV, BESIII also reve…
With about 12 fb$^{-1}$ of collected data useful for the study of $XYZ$ states, BESIII collaboration continues the exploration of these exotic charmoniumlike states. Recent results of the measurements of the line-shape of $e^+e^-\toπ^0π^0ψ(3686)$, $KKJ/ψ$, and $π^+D^0D^{*-}$, as well as the $J^P$ determination of $Z_c(3900)$ and $Z_c(3900)$ observed in $e^+e^-\toϕχ_{c1, 2}$ at $\sqrt{s}=4.6$~GeV will be presented.
With about 12 fb$^{-1}$ collected XYZ data sets, BESIII continues the exploration of the exotic charmonium-like states. In this talk, recent results on the measurements of the spin-parity determination of $Z_{\rm c}(3900)$, as well as on line-shapes of $e^+e^- \rightarrow J/ψ\,ππ, h_{\rm c}ππ, ψ(2S)\,π^0π^0/π^+π^-$, and $π^+ D^0 D^{*-}$ from open charm are discussed. Also, the recent observation of $e^+ e^- \rightarrow ϕχ_{c1/2}$ at $\sqrt(s)=4.6$ GeV is reported.
The BESIII experiment at BEPCII at IHEP in Beijing/China has collected the world largest data sets in the $τ$-charm region and it is well suited to cover a rich hadron physics programme, including charmonium and open-charm spectroscopy, $R$-scan or electromagnetic form factor measurements, and many more. In particular, the unique data sets between 3.8 and 4.6\,GeV allow for discoveries and precision measurements of the interesting charmonium-like (exotic) `XYZ' states. The recently published precision cross-section measurement for $Y$ states is discussed as well as the first observation of the…
Discovery of XYZ particles at the BESIII Experiment
本文回顾BESIII实验在XYZ粒子研究中的贡献，重点介绍Zc(3900)、Zc(4020)、Zcs(3985)四夸克态及新矢量类粲偶素态的发现。
With its unique data samples at energies of 3.8--4.6 GeV, the BESIII experiment made a significant contribution to the study of charmonium and charmonium-like states, i.e., the XYZ states. We review the results for observations of the Zc(3900) and Zc(4020) states, the X(3872) in e+e- annihilation, and charmonium psi(1^3D_2) state, as well as measurements of the cross-sections of omega chi_cJ and eta J/psi, and the search for e+e- to gamma chi_cJ and gamma Y(4140). We also present data from BESIII that may further strengthen the study of the XYZ and conventional charmonium states, and discuss p…
The recent measurement results of exotic charmonium-like states, the so called XYZ particles, at BESIII have been presented. I mainly discussed the charged Zc(3900) state, its neutral partner, and possible excited states.
The BESIII and the LHCb became the leading experiments in the study of the exotic states after the Belle and BaBar experiments finished their data taking in the first decade of this century. We review the progress in the study of the XYZ states at BESIII and LHCb experiments with their unique data samples in $e^+e^-$ annihilation at center-of-mass energies of 3.8--4.6~GeV and in pp collision at center-of-mass energies 7, 8, and 13~TeV, respectively. With these data samples, we have deepened our understanding of the most famous charmonium-like states X(3872), Y(4260), Z_c(3900), and Z_c(4430), …
Hadron spectroscopy is one of the most important physics goals of BESIII. BESIII brings great opportunities to study the XYZ states of charmonium by directly producing the Y states up to 4.6 GeV. High statistics of charmonium decays collected at BESIII provide an excellent place for hunting gluonic excitations and studying the excited baryons. Recent results of light hadron spectroscopy and charmonium spectroscopy from BESIII will be reported.
Despite being extensively studied since their initial discovery in 2003, the XYZ states do not yet have a clear interpretation. BESIII recently collected additional data above 4 GeV which can be used to further study these exotic hadron candidates. We present recent studies of $X(3872)\toπ^0χ_{c0}$, $e^+e^-\to K^+K^-J/ψ$, $e^+e^-\to$ light hadrons, $e^+e^-\to D^{*+}D^{(*)-}$, and on the $Z_{cs}(3985)$.
The BESIII experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the world's largest samples of direct $e^+e^-$ collisions in the $τ$-charm region. From the collected samples, which include $e^+e^-$ annihilations at $J/ψ$, $ψ'$, $ψ$(3770) peaks and in the region from 3.8$\,$GeV to 4.6$\,$GeV, BESIII has produced many new physics results in the spectroscopy, transitions, and decays of charmonium(-like) states. This talk will cover the latest results over a wide range of topics from radiative and hadronic transitions among charmonium states, as well as the productions and…
Since few years, a new family of exotic states has been appearing above the open-heavy meson thresholds: the so-called $XYZ$ states. BESIII at the BEPCII $e^+e^-$ collider plays a unique role in the study of those particles in the charmonium sector. Changing the beam energy, BESIII can collect large data samples by means of scans of the resonant region, accessing directly to all vector states. As part of a larger upgrade program, BESIII has planned to increase the center of mass energy to reach $4.7$ GeV: this will allow BESIII to investigate the nature of the $Y(4660)$, that was at first obse…
A selection of results from electron-positron collisions at BESIII are reviewed. The results presented here illustrate the wide range of physics topics that can be studied using the Beijing Electron Positron Collider~(BEPC). At low collision energies, the cross section for $e^+e^-\to π^+π^-$ provides much-needed input into theoretical calculations of the anomalous magnetic moment of the muon, and the reaction $e^+e^-\to p\bar{p}$ provides access to the electromagnetic form factors of the proton. In the charmonium region, a large sample of $ψ^\prime$ decays can be used to measure new decay mode…
In this talk, we present the recent study on the charmoniumlike states from the e^+e^- colliders, including BESIII, Belle, BaBar, and CLEOc. The talk covers the X(3872) from the Y(4260) radiative transition, the Y states from the initial-state-radiation processes and from e+e- to pi+pi-h_c, and the charged Z_c states.
Through the spin rearrangement scheme in the heavy quark limit, we have performed a comprehensive investigation of the decay pattern and production mechanism of the hidden beauty di-meson states, which are either composed of a P-wave bottom meson and an S-wave bottom meson or two S-wave bottom mesons. We further extend the corresponding formula to discuss the decay behavior of some charmonium-like states by combining the experimental information with our numerical results. The typical ratios presented in this work can be measured by future experiments like BESIII, Belle, LHCb and the forthcomi…
What's new with the XYZ mesons?
我回顾了最近关于所谓XYZ介子的一些实验结果。
In this paper, I review recent progress in the study of the $XYZ$ particles at Belle. I only focus on studies with charmonium and one or more light mesons in the final states. This covers the X(3872), X(3915), Y(4140), X(4350), and the charged Z states.
We report the latest outcomes for the Charmonium system investigation on 226x10^6 J/Psi and 106x10^6 Psi' events collected with the BESIII detector at the BEPCII e+e- collider.
We report some recent results on charmonium spectroscopy and hadron spectroscopy from BESIII experiment, including the measurements of the masses and widths of $h_c$, $η_c$, $η_c(2S)$ and some new resonances around 2 GeV. The results are based on a data sample of 106 million $ψ^\prime$ events and 226 million J/$ψ$ events collected with the BESIII detector at the BEPCII collider.
Recent results on (semi)-leptonic $D$ decays and charm baryons at BESIII
BESIII利用最新数据研究敞开charm强子的纯轻子和半轻子衰变及轻子体对极化特性。
In 2009, the BESIII experiment has collected about 225M $\jpsi$ and 106M $\psip$ samples, both of which are the world largest on-peak charmonium production. Based on these dataset, BESIII has made great effort on the study of the charmonium decays, some important of which have been reviewed in this proceeding. In addition, a searching for new physics through the $CP/P$ violation process is reported.
I report BESIII preliminary results on: 1 Measurement of sigma(e+e- ->DDbar at Ecm = 3.773 GeV 2 Study of the DDbar production line shape near Ecm = 3.773 GeV 3 The first observation of singly Cabibbo-suppressed decay, D -> omega pi 4 Measurement of BF(Ds+ -> eta' X) and BF(Ds+ -> eta' rho+) .
Light Meson Decays at BESIII
本报告回顾了BESIII实验利用全球最大Jpsi样本，通过辐射或强子衰变在eta和eta'轻介子谱学研究中取得的最新进展与亮点。
In this talk, we present a selection of recent results from BESIII collaboration, including observation of the charmoniumlike states, Zc(3900), Zc(4020) and Zc(4025); observation of e+e- -> gamma X(3872); partial wave analysis of J/psi -> gamma eta eta; measurement of D+ -> mu+ nu and D0 -> K- e+ nu, pi- e+ nu. The results are based on the data samples collected with the BESIII detector at central-of-mass energies from 3.900 to 4.420 GeV, and at the energies of J/psi and psi(3770) resonances.
In recent years, lots of studies of charmonium decays have been performed at BESIII based on large data samples of $J/ψ$, $ψ(3686)$ and $ψ(3770)$. Recent results in searches for radiative transitions of $ψ(3770)$ and rare phenomena in charmonium decays, and studies of light hadrons structures and properties will be presented.
The BESIII experiment, based on the BEPCII collider at IHEP in Beijing, China, is capable of measuring nucleon form factors with unprecedented precision. We report recent results achieved by the BESIII collaboration concerning the nucleon time-like form factors and the hyperon pair production. More in detail we outline the results obtained by the study of the process $e^+e^- \to p \overline p$, using both the scan-energy and initial-state radiation techniques, those of the process $e^+e^- \to n \overline n$, and the study of the $Σ$ polarization regarding the process $e^+e^- \to J/ψ\to Σ^+\ove…
Despite the successes of the standard model, the non-perturbative dynamics of the strong interaction are not fully understood yet. Charmonium spectroscopy serves as an ideal tool to shed light on the dynamics of the strong interaction such as quark confinement and the generation of hadron masses. The BESIII collaboration studies extensively the strong interaction and various aspects that could shed light on physics beyond the standard model via copious e$^+$e$^-$ collisions at the BESIII/BEPCII facility in Beijing, China, in the charmonium mass regime. I present a few of the recent results wit…
We present recent BESIII results about the study of mesons which contain at least one charm quark. We determined the D(s)+ decay constants, the form factors of D semi-leptonic decays, the CKM matrix elements |Vcs(d)|.
The world's largest sample of $J/ψ$ events accumulated at the BESIII dector offers a unique opportunity to investigate $η$ and $η^\prime$ physics via two body $J/ψ$ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in $η/η^\prime$ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including the observation of $η^\prime\rightarrowπ^+π^-μ^+μ^-$, the study of $η^\prime\rightarrowπ^+π^-e^+e^-$, and search for $CP$-violation in this decay, search for the rare decays of $η^\prime\rightarrow4π^0…
Many extensions of the Standard Model introduce a new type of weak-interacting degrees of freedom. These models are motivated by the results of recent experimental anomalies. Typical models, such as Next-to-Minimal Supersymmetric Standard Model and Light Hidden Dark-sector Model, introduce the possibilities of low-mass Higgs and dark bosons. The masses of such particles are expected to be few GeV and thus making them accessible at BESIII experiment, an $e^+e^-$ collider experiment running at tau-charm region. This report summarizes the recent results of low-mass Higgs and dark bosons searches …
Charm hadronic decays are an important tool for understanding the the hadron spectroscopy and dynamics of the strong interaction in the low energy regime. BESIII experiment has collected a huge amount of data at various energy points around $D\bar{D}$ and $D_sD_s^*$ threshold. This report summarizes recent amplitude analyses and branching fraction measurements results of BESIII related to $D_{(s)}$ decays.
The latest results on chi_cJ(1P) decays from BESIII and CLEO-c are reviewed and compared to theoretical predictions. The experimental results use the final samples of chi_cJ(1P) decays from CLEO-c, obtained from 26 million psi(2S) decays, and the most recent samples from BESIII, from a starting sample of 106 million psi(2S) decays.
Light hadron spectroscopy plays an important role in understanding the decay dynamics of unconventional hadronic states, such as strangeonium and glueballs. BESIII provides an ideal avenue to search for these exotic states thanks to a huge amount of data recorded at various energy points in the tau-charm mass region including J/psi resonance. This report summarizes recent results of the BESIII experiment related to the glueballs and strangeonium-like states.
Hyperon Physics at BESIII
本文介绍了BESIII实验在超子物理领域的最新进展，利用其收集的大量粲偶素事件，研究超子横向极化以寻找CP破坏，并探索弱辐射衰变与超子-核子相互作用。
BESIII is a new state-of-the-art 4$π$ detector at the upgraded BEPCII two-ring $\ee$ collider at the Institute of High Energy Physics in Beijing, China. It has been in operation since 2008, and has collected the world's largest data samples of $\jpsi$, $\psip$ and $ψ(3770)$ decays, as well as $τ$ mass scan and low energy points for $R$ measurement. These data are being used to make a variety of interesting and unique studies of light-hadron spectroscopy, precision charmonium physics, high-statistics measurements of $D$ meson decays, $τ$ mass measurement and $R$ measurement. Results summarized …
Recent BES results and the BESIII upgrade
利用北京正负电子对撞机（BEPC）BESI Ⅱ探测器收集的5800万$J/ψ$和1400万$ψ(2S)$事例，测量了$J/ψ$、$ψ(2S) \to Λ\barΛ π^0$和$Λ\barΛ η$衰变的分支分数或上限，首次观测到$J/ψ$和$ψ(2S)$衰变为$n K^0_S \barΛ+c.c.$的过程。最后，$R$测量数据采取与BESII探测器在3.7和5.0 GeV之间的质心能量进行拟合，以确定共振参数的高质量粲偶素状态，$ψ(3770)$，$ψ(4040)$，$ψ(4160)$，和$ψ(4415)$。北京电子对撞机正在升级为双环对撞机（BEPCII），设计亮度为3.89 GeV的$1 \times 10^{33}$ cm $^{-2}$ s $^{-1}$，将在2 - 4.2 GeV的质心运行。有了这个亮度，新的BESIII探测器将能够在一年的运行中收集100亿个PDMATHAMM事件。BEPCII和BESIII目前已接近完成，预计将于2008年年中开始试运行。
Search for charm rare decays at BESIII
BESIII利用大量数据探索charm强子衰变中的罕见过程，总结最新研究成果。
Leptonic and semileptonic charm decays at BESIII
BESIII实验利用不同中心对撞能数据，研究charm纯轻子和半轻子衰变，测量分支比、CKM矩阵元素、衰变常数和形式因子，并检验轻子味普遍性。
Search for dark sector and rare decays at BESIII
BESIII实验利用charm介子、超子等数据探索暗物质和罕见衰变，报告了暗物质搜寻、暗重子搜寻及轻向量玻色子搜寻结果，以及罕见衰变过程的探索。
The BESIII experiment at the electron-positron collider BEPCII in Beijing (China) is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world's largest data samples at the $J/ψ$ and $ψ'$ resonances. The recent observations of hyperon polarizations at BESIII opens a new window for testing CP violation, as it allows for simultaneous production and detection of hyperon and anti-hyperon pair two-body weak decays. The CP-symmetry tests can be performed in processes like e.g. $J/ψ\toΛ\barΛ$, $J/ψ,ψ'\toΣ^+\barΣ^-$ and $J/ψ\toΞ^-\barΞ^+$. For t…
Recent results of (semi)leptonic decays of charm hadrons at BESIII
本文报告BESIII实验对粲介子多种（半）轻子衰变的最新测量，精确测定CKM矩阵元、衰变常数和强子形状因子，检验轻子味道普适性，并首次利用图神经网络观测到稀有贝塔衰变。
We present a selection of recent results from the BESIII collaboration, including both charmonium and $D$ meson physics. We first discuss the observation of a charged, charmonium-like state, the $Z_c(3900)$. Conventional charmonium topics include a search for lepton flavor violation, studies of $χ_{cJ} \to γγ$ decays, and mass and width determinations for the $h_c$, $η_c(1S)$, and $η_c(2S)$. We finish with results on the decay constant $f_D$ from $D^+ \to μ^+ ν$ and on form-factors in $D^0 \to K^- e^+ ν, π^- e^+ ν$.
The study of mesons and baryons which contain at least one charm quark is referred to as open charm physics. It offers the possibility to study up-type quark transitions. Since the $c$ quark can not be treated in any mass limit, theoretical predictions are difficult and experimental input is crucial. BESIII collected large data samples of $e^{+}e^{-}$ collisions at several charm thresholds. The at-threshold decay topology offers special opportunities to study open charm decays. We present a selection of recent BESIII results. Branching fractions and the $D_{s}^{+}$ decay constant are measured …
Recent results of exotic states with heavy quarks, denoted as $XYZ$ states, are presented. The results include searches for the $Y$(4260) in $B$ meson decays, a spin partner of $Y$(4630), and the strange Pentaquark $P_s^+$. In addition, the measurements of the absolute branching fraction of $X$(3872) and search for double $Z_c$ production is discussed.
Precision Studies of the $η_c$ decay at BESIII
BESIII通过辐射跃迁产生大量η_c样本，研究其衰变特性以揭示强相互作用在底夸克领域中的作用，重点包括J/ψ→γη_c、η_c→γγ及多种有核衰变。
A brief report of some recent experimental developments concerning the $X$, $Y$ and $Z$ charmoniumlike mesons states and other puzzling states from the BaBar, Belle, BESIII and CDF experiments is presented.
The uncertainties of the Standard Model prediction of the anomalous magnetic moment of the muon are currently completely dominated by hadronic contributions. The largest contribution is due to the hadronic vacuum polarization. Hadronic cross sections measured at $e^+e^-$ colliders can be exploited as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using different methods. At center-of-mass energies above 2 GeV exclusive and inclusive cross sections can be measured in an energy scan. Addit…
The BESIII experiment has collected world's largest direct $e^+e^-$ colliding beam data at the $J/ψ$, $ψ'$, $ψ$(3770) and at and around the $Y$(4260). These data have enabled the study of hadrons at unprecedented precisions. We present results on the light hadron spectroscopy, production of hadrons in radiative decays of charmonia, observation of new excited $N^*$ baryons and of anomalous decays of the $η/η'$ states.
Observation of vector charmoniumlike states and search for $Z_{cs}$ in $e^+ e^- \to K^+ K^- J/ψ$ at BESIII
BESIII实验测量$e^+e^-\to K^+K^- J/ψ$过程，首次发现$Y(4230)$的新衰变模式，报道两个新矢量类粲偶素态，并开展带电类粲偶素态探索研究。
Experimental Advances on Light Baryon Spectroscopy at BESIII Experiment
本文综述了BESIII实验在重子谱学中的进展，重点介绍了最近在激发核子态、Λ超子态、Σ超子态、Ξ超子态和Ω⁻超子态方面的突破性成果，扩展了重子激发态谱并为理解非微扰QCD和解决'缺失重子共振'问题提供了实验支持。
About 2.9 fb$^{-1}$ data set had been collected with the BESIII detector at the BEPCII collider. Taking advantages of data near open-charm threshold, we present preliminary results on leptonic and semileptonic charm-meson decays, as well as result on the FCNC process $D^0 \rightarrow γγ$ from BESIII experiment. High precision charm data will enable us to validate Lattice QCD calculations at the few percent level. These can then be used to make precise measurements of CKM elements, $V_{cd}$ and $V_{cs}$, which are useful to improve the accuracy of test of the CKM unitary.
BSM searches at BESIII
BESIII利用世界最大阈值数据集，通过搜寻类轴子、暗光子、QCD轴子、K_S^0不可见衰变及稀有粲衰变等过程，系统探索超越标准模型的新物理。
Tests of CP symmetry in entangled hyperon anti-hyperon pairs at BESIII
利用高统计的J/ψ和ψ(3686)事件产生的ΛΛ、ΣΣ、ΞΞ和ΛΣ对，BESIII在CP对称性测试中取得显著进展，推动了双子粒子物理的理论和实验研究。
This report highlights the recent BESIII results related to the measurement of the $R$ value, radiative decays of $J/ψ$ and the polarization of $D^0 \to ωϕ$ decay. BESIII, a symmetric electron-positron collider experiment, has collected a large data sample at several energy points in the tau-charm region, including the $J/ψ$ and $ψ(3770)$ resonances. Based on the data samples collected at 14 center-of-mass energy ($\sqrt{s}$) points between 2.2323 and 3.671 GeV, BESIII has achieved a measurement of the $R$ value with an accuracy down to the level of $2.6\%$ for $\sqrt{s} < 3.1$ GeV and $3.0\%$…
We present the most recent results from the BESIII experiment. This review covers the studies of charmonium decays, light hadron spectroscopy and charm physics. Especially, the prospects for weak decays of charm mesons are addressed at the BESIII.
Search for rare charm decays at BESIII
BESIII实验利用最大粲数据样本搜索稀有衰变，涵盖弱衰变、味改变中性流等，未发现显著信号，并设定了多个分支比上限。
Charmonium spectroscopy provides strong guidelines to effective field theories, thereby gaining insight into quark confinement and the generation of hadron masses. Hadronic transitions between charmonium states have been measured with unprecedented high precision with the BESIII spectrometer at IHEP Beijing, China. We present systematic studies of isospin-violating decays in charmonium, such as $ψ' \rightarrow π^{0} J/ψ$, $ψ' \rightarrow π^{0} h_{c}$, $e^{+}e^{-} \rightarrow π^{0} J/ψ$ at $\sqrt{s}=$ 4.009 GeV, and their improved measurements of their branching fractions.
Using about $226\times 10^6$ $\jpsi$ events and $106\times 10^6$ $ψ^{\prime}$ events collected with the BESIII detector at the BEPCII $e^+e^-$ collider, the Dalitz plot of $\etap \to ηπ^+ π^-$ decay is studied, the direct measurement of $a^{0}_{0}(980)-f_{0}(980)$ mixing is performed, $X(2120)$ and $X(2370)$ are observed in the $π^+π^-η^\prime$ invariant mass spectrum, $ψ^{\prime}\toγπ^0$ and $ψ^{\prime}\toγη$ are observed for the first time, and the decays $χ_{cJ}\toγV$ ($V=ϕ$, $ρ^0$, $ω$) are studied.
Recent Advances in Hadron Production in $e^+e^-$ Annihilation at BESIII
BESIII实验在3.5-4.9 GeV能区测量了多种重子产生截面，发现介子波函数中显著的味道SU(3)破缺，并首次观测到ψ(3770)到K_S^0 K_L^0的稀有衰变，为强子动力学提供了新见解。
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