在质心能量为10.58GeV的电子正电子湮没的D-Dbar事件中,寻找粲偶素和其它新态.数据样本对应于384 fb-1的积分亮度,并由PEP-II储存环上的BABAR实验记录。D-D巴质谱显示了psi(3770)以及其他在3.9、4.1和4.4 GeV/c^2附近的结构的明显证据。没有观察到Y(4260)-> D Dbar的证据,导致在90%置信水平下B(Y(4260)-> D Dbar)/B(Y(4260)-> J/psi pi+ pi-)< 1.0的上限。
英文摘要:
A search for charmonium and other new states is performed in a study of exclusive initial-state-radiation production of D Dbar events from electron-positron annihilations at a center-of-mass energy of 10.58 GeV. The data sample corresponds to an integrated luminosity of 384 fb-1 and was recorded by the BABAR experiment at the PEP-II storage ring. The D Dbar mass spectrum shows clear evidence of the psi(3770) plus other structures near 3.9, 4.1, and 4.4 GeV/c^2. No evidence for Y(4260) -> D Dbar is observed, leading to an upper limit of B(Y(4260) -> D Dbar)/B(Y(4260) -> J/psi pi+ pi-) < 1.0 at 90 % confidence level.
Measurement of the e+e- --> D0D*-pi+ cross section using initial-state radiation
我们报告的独家截面的测量e+e-> D 0 D *-π +作为质心能量的函数从D 0 D *-π +阈值到5.2 GeV的初始状态辐射。没有发现Y(4260)→> D 0 D *-π +衰变的证据。该分析是基于在KEKB非对称能量e+e-对撞机上Belle探测器在10.58 GeV质心能量处或附近收集的数据样本,积分亮度为695 1/fb。
Measurement of coherent exclusive $J/ψ\toμ^+μ^-$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\textrm{NN}}}=5.36$ TeV with the ATLAS detector
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)(欧洲核子研究中心)
Experimental prospects for quantum decoherence measurements at colliders
The University of Edinburgh(爱丁堡大学);Instituto de Física Corpuscular (IFIC), CSIC‐Universitat de València(瓦伦西亚大学与西班牙国家科学研究委员会联合物理研究所);Université Catholique de Louvain(天主教鲁汶大学);INFN, Sezione di Bologna(意大利国家核物理研究所博洛尼部分所);CERN(欧洲核子研究中心);University of Warsaw(华沙大学)