pΞ−p\Xi^- Correlation in Relativistic Heavy Ion Collisions with Nucleon-Hyperon Interaction from Lattice QCD

On the basis of the $p\Xi^-$ interaction extracted from (2+1)-flavor lattice QCD simulations at the physical point, the momentum correlation of $p$ and $\Xi^-$ produced in relativistic heavy ion collisions is evaluated. $C_{\rm SL}(Q)$ defined by a ratio of the momentum correlations between the systems with different source sizes is shown to be largely enhanced at low momentum due to the strong attraction between $p$ and $\Xi^-$ in the $I=J=0$ channel. Thus, measuring this ratio at RHIC and LHC and its comparison to the theoretical analysis will give a useful constraint on the $p\Xi^-$ interaction.Comment: 4 pages, 2 figures; proceedings contribution for Quark Matter 201

インスリン受容体とGq共役受容体シグナル伝達系間の相互作用

Insulin exerts diverse physiological effects, which are mediated by its specific receptor with intrinsic protein tyrosine kinase activity. On the other hand, heterotrimeric G-proteins, consisting of α, β and γ subunits, are coupled to specific receptors for many ligands, and transmit the signal to the downstream effectors. Kishi et al. have already reported that stimulation of Gq-coupled receptors can induce GLUT 4 (glucose transporter type 4) translocation to the cell surface in an insulin-independent manner in CHO cells and 3T3-L1 adipocytes. In this study, we have established CHO (Chinese hamster ovary) cells stably expressing Gq-coupled bradykinin receptors, in order to examine crosstalks between insulin- and G-protein-coupled receptor-mediated signal transduction pathways. Insulin enhanced insulin receptor kinase activity, IRS-1 (insulin receptor substrate-1) tyrosine phosphorylation, PI 3-kinase and Akt kinase activities, and glycogen synthesis, and induced GLUT 4 translocation in this cell line. Bradykinin treatment inhibited the insulin-stimulated receptor kinase activity, IRS-1 phosphorylation, PI 3-kinase and Akt kinase activities, and glycogen synthesis, while bradykinin itself had no effects on the insulin receptor kinase, IRS-1, PI3-kinase, Akt kinase, and glycogen synthesis. These results showed that Gq signaling interferes insulin receptor signaling at least in the early step (s) including insulin receptor kinase activation. The Gq-mediated inhibition of insulin signal may explain some insulin resistant states appeared in non-insulin-dependent diabetes mellitus

Femtoscopic study of coupled-channel baryon-baryon interactions with S=−2S=-2

Particles and Nuclei International Conference - PANIC2021, 5 - 10 September, 2021, OnlineThe correlation functions of pΞ− and ΛΛ pairs from pp and pA collisions are studied in the coupled-channel framework using the NΞ-ΛΛ coupled-channel baryon-baryon potentials obtained in the lattice QCD calculation at almost physical quark masses. The pΞ− correlation function is calculated to be significantly enhanced from the pure Coulomb case, while the ΛΛ correlation function is slightly enhanced from that of the pure fermion quantum statistics. These features reflect the large and small scattering lengths in the pΞ− and ΛΛ channels in magnitude, and agree with the observed data by the ALICE collaboration. The agreement confirms the S = −2 baryon-baryon potentials from lattice QCD

Multi-quark hadrons from Heavy Ion Collisions

Identifying hadronic molecular states and/or hadrons with multi-quark components either with or without exotic quantum numbers is a long standing challenge in hadronic physics. We suggest that studying the production of these hadrons in relativistic heavy ion collisions offer a promising resolution to this problem as yields of exotic hadrons are expected to be strongly affected by their structures. Using the coalescence model for hadron production, we find that compared to the case of a non-exotic hadron with normal quark numbers, the yield of an exotic hadron is typically an order of magnitude smaller when it is a compact multi-quark state and a factor of two or more larger when it is a loosely bound hadronic molecule. We further find that due to the appreciable numbers of charm and bottom quarks produced in heavy ion collisions at RHIC and even larger numbers expected at LHC, some of the newly proposed heavy exotic states could be produced and realistically measured in these experiments.Comment: 4 pages, 1 figure, revised version to be published in Phys. Rev. Let

Exotics from Heavy Ion Collisions

Discriminating hadronic molecular and multi-quark states is a long standing problem in hadronic physics. We propose here to utilize relativistic heavy ion collisions to resolve this problem, as exotic hadron yields are expected to be strongly affected by their structures. Using the coalescence model, we find that the exotic hadron yield relative to the statistical model result is typically an order of magnitude smaller for a compact multi-quark state, and larger by a factor of two or more for a loosely bound hadronic molecule. We further find that some of the newly proposed heavy exotic states could be produced and realistically measured at RHIC and LHC.Comment: Presented at International Conference on the Structure of Baryons (Baryons '10), Osaka, Japan, Dec.7-11, 201