论文标题
$ p \ bar {p} $ collisions生产的异国黑龙的最新D0结果
Latest D0 results on exotic hadrons produced in $p\bar{p}$ collisions
论文作者
论文摘要
使用$ \ sim $ 10.4 fb $^{ - 1} $数据样本研究由$ \ sqrt {s} $ = 1.96 tev进行的，使用$ \ sim $ 10.4 fb $^{ - 1} $数据样本研究了异国情调的多Quark状态的提示和非宣传生产。据报道，最近在4450 MEV地区的$ x（3872）$和$ z_c^+（3900）$状态的$ x（3872）$和$ z_c^+（3900）$状态的D0结果。与这些状态相对应的信号是在非累积产量中发现的，而在及时生产中只有$ x（3872）$状态。在D0测量中，提示与非项目$ x（3872）$生产的比率大约是ATLAS实验在8 TEV上获得的测量比。从理论上讲，对于具有（0.4-0.8）FM的常规介体，诸如四quarks，例如具有少数fm和空间扩展的分子状态的跨Quarks，例如（0.4-0.8）FM的传统介体，预计生产，形成，结合和分离过程将完全不同。它们在迅速的强子 - 哈德隆碰撞中可能会受到不同的影响，在相互作用点从相互作用点发出许多其他粒子。因此，由于强子 - 哈德隆碰撞粒子多重性的差异很大，因此可以抑制LHC与Tevatron条件相比，可以抑制空间扩展外来状态的提示与非累积的生产比。迅速的生产研究为更好地理解异国国家的本质提供了机会。
Prompt and nonprompt productions of exotic multiquark states are studied using the $\sim$10.4 fb$^{-1}$ data sample collected by the D0 experiment in Tevatron $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV. The recent D0 results on the prompt and nonprompt production of the $X(3872)$ and $Z_c^+(3900)$ states and the $P_c$ pentaquarks at the 4450 MeV region are reported. Signals corresponding to these states are found in the nonprompt production, whereas only the $X(3872)$ state is seen in the prompt production. The ratio of prompt to nonprompt $X(3872)$ production is about three times larger in the D0 measurement than that obtained by the ATLAS experiment at 8 TeV. Theoretically, the production, formation, coalescence, and disassociation processes are expected to be quite different for conventional mesons with a spatial size of (0.4-0.8) fm, compact multiquark states such as tetraquarks with a size of a few fm, and spatially extended molecular states with a size of (4-10) fm. They can be differently affected in prompt hadron-hadron collisions where there are many additional particles emitted from the interaction point. Consequently, the prompt to nonprompt production ratio of spatially extended exotic states can be suppressed at LHC comparing with the Tevatron conditions, because of large difference in the hadron-hadron collisions particle multiplicity. The prompt production studies provide an opportunity to better understand the nature of exotic states.
