论文标题
$ t_ {cc}^+$（3875）和柔软的锥子的生产中三角奇异性
Triangle Singularity in the Production of $T_{cc}^+$(3875) and a Soft Pion
论文作者
论文摘要
双链Tetraquark Meson $ t_ {cc}^+（3875）$可以通过高能质子 - 普罗顿碰撞来产生，通过创建Charm Mesons $ d^{*+} d^0 $在短距离时，它们在短距离上，然后将其绑定到$ t_ {cc} cc} {cc}^+$中。 $ t_ {cc}^+$也可以通过在短距离的$ d^{*+} d^{*+} $的创建中产生，然后将其删除成$ t_ {cc}^+π^+$。一个魅力的三角形奇异性在$ t_ {cc}^+π^+ $不变的质量分布中产生一个狭窄的峰值，高于阈值，宽度约为1 meV。远远超出了峰值，差分横截面随着$ t_ {cc}^+π^+ $的不变动能$ e $ e $ a即$ e^{ - 1/2} $而减小。与$π^+$一起使用的$ t_ {cc}^+$带有$ e <m_π$的分数约为3％。 $ t_ {cc}^+$ $事件的分数与$ t_ {cc}^+π^+$在三角形奇点的狭窄峰中的分数可能是可比的。
The double-charm tetraquark meson $T_{cc}^+(3875)$ can be produced in high-energy proton-proton collisions by the creation of the charm mesons $D^{*+} D^0$ at short distances followed by their binding into $T_{cc}^+$. The $T_{cc}^+$ can also be produced by the creation of $D^{*+} D^{*+}$ at short distances followed by their rescattering into $T_{cc}^+ π^+$. A charm-meson triangle singularity produces a narrow peak in the $T_{cc}^+ π^+$ invariant mass distribution 6.1 MeV above the threshold with a width of about 1 MeV. Well beyond the peak, the differential cross section decreases with the invariant kinetic energy $E$ of $T_{cc}^+ π^+$ as $E^{-1/2}$. The fraction of $T_{cc}^+$ that are accompanied by $π^+$ with $E< m_π$ is estimated to be roughly 3%. The fraction of $T_{cc}^+$ events with $T_{cc}^+ π^+$ in the narrow peak from the triangle singularity could be comparable.
