Wed·Jan 3, 2018Wednesday·January 3, 2018

1. 01*

   Hoyle-analogue state in 13C studied with Antisymmetrized Molecular Dynamics

   Y. Chiba🇯🇵 · M. Kimura🇯🇵

   The cluster states in ${}^{13}\mathrm{C}$ are investigated by antisymmetrized molecular dynamics. By investigating the spectroscopic factors, the cluster configurations of the excited states are discussed. It is found that the $1/2_2^{+}$ state is dominantly composed of the ${}^{12}\mathrm{C}(0_2^{+})\otimes s_{1/2}$ configuration and can be regarded as a Hoyle analogue state. On the other hand, the p-wave states ($3/2^{-}$ and $1/2^{-}$) do not have such structure, because of the coupling with other configurations. The isoscalar monopole and dipole transition strengths from the ground to the excited states are also studied. It is shown that the excited $1/2^{-}$ states have strong isoscalar monopole transition strengths consistent with the observation. On the other hand, the excited $1/2^{+}$ states unexpectedly have weak isoscalar dipole transitions except for the $1/2_1^{+}$ state. It is discussed that the suppression of the dipole transition is attributed to the property of the dipole operator.

   ↳ nucl-thnucl-exPRC(2020)·22 citations
2. 02*

   Transverse-velocity scaling of femtoscopy in $\sqrt{s}=7$ TeV proton-proton collisions

   T. J. Humanic🇺🇸

   Although transverse-mass scaling of femtoscopic radii is found to hold to a good approximation in heavy-ion collision experiments, it is seen to fail for high-energy proton-proton collisions. It is shown that if invariant radius parameters are plotted versus the transverse velocity instead, scaling with the transverse velocity is seen in $\sqrt{s}=7$ TeV proton-proton experiments. A simple semi-classical model is shown to qualitatively reproduce this transverse velocity scaling.

   ↳ hep-phnucl-exJ.Phys.G(2018)·2 citations
3. 03*

   On the clustering properties of produced particles in high-energy $pp$ collisions

   Cheuk-Yin Wong🇺🇸 · Hanpu Jiang🇺🇸 · Nanxi Yao🇺🇸 · Liwen Wen🇺🇸 · Gang Wang🇺🇸 · Huan Zhong Huang🇺🇸

   Minijets provide useful information on parton interactions in the low transverse-momentum (low-$p_T$) region. Because minijets produce clusters, we study the clustering properties of produced particles in high-energy $pp$ collisions as a first step to identify minijets. We develop an algorithm to find clusters by using the k-means clustering method, in conjunction with a k-number (cluster number) selection principle in the space of pseudorapidity and azimuthal angles. We test the clustering algorithm using events generated by PYTHIA 8.1, for $pp$ collision at $\sqrt{s}=200$ GeV. We find that clustering of low-$p_T$ hadrons occurs in high multiplicity events. However similar clustering properties are also present for particles produced randomly in a finite pseudorapidity and azimuthal angle space. To distinguish the dynamics from random generations of events, it is necessary to examine the correlation between particles and between clusters. We find that the correlations between clusters may provide a useful tool to distinguish the underlying dynamics of the reaction mechanism.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2020)·4 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.