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SUMMARY:Entanglement Entropy of the Infinitely-Heavy Quark-Antiquark Syste
 m from Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T100000Z
DTEND;VALUE=DATE-TIME:20261010T101500Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2857@indico.itp.ac.cn
DESCRIPTION:Speakers: 刘源 范 (South China Normal University)\nAn infin
 ite-heavy quark system can clearly be divided into two subsystems: one con
 sisting of two infinitely heavy quarks and the other being the sea gluon a
 nd sea quark subsystem\, allowing us to define the reduced density matrix 
 and entanglement entropy. We calculate the reduced density matrix defined 
 in color space under the Coulomb gauge condition on lattice dynamical conf
 igurations and find the relationship between the proportion of different c
 olor components and the distance between quarks.\n\nhttps://indico.itp.ac.
 cn/event/437/contributions/2857/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2857/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral anomaly\, neutral pion lifetime and axion-photon coupling
DTSTART;VALUE=DATE-TIME:20261010T094500Z
DTEND;VALUE=DATE-TIME:20261010T100000Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2829@indico.itp.ac.cn
DESCRIPTION:Speakers: Tian Lin (Peking University)\nThe chiral anomaly und
 erlies many processes\, including the two-photon decay of the neutral pion
  and the axion-photon coupling\, and fixes their leading-order contributio
 ns to a constant independent of QCD dynamics. However\, traditional lattic
 e QCD methods compute the complete amplitude\, making percent-level precis
 ion demanding. We show that\, by applying the anomalous Ward identity (AWI
 )\, the anomalous contribution can be isolated directly\, leaving only a f
 inite-quark-mass correction that lattice QCD evaluates reliably.Employing 
 this strategy\, we present the first lattice determination of the neutral 
 pion lifetime with isospin-breaking effects\, and determine the axion-phot
 on coupling to $1.8\\%$ precision\, furnishing a first-principles benchmar
 k and reconciling the discrepancies among published ChPT determinations.\n
 \nhttps://indico.itp.ac.cn/event/437/contributions/2829/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2829/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral and $U(1)_A$ symmetries in background magnetic fields from 
 lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T093000Z
DTEND;VALUE=DATE-TIME:20261010T094500Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2820@indico.itp.ac.cn
DESCRIPTION:Speakers: 丹 张 (Central China Normal University)\nUnderstan
 ding how external magnetic fields affect chiral and singlet $U(1)_A$ symme
 try breaking is an important question in QCD under extreme conditions. In 
 a pure magnetic background\, the unequal electric charges of the light qua
 rks explicitly reduce the non-singlet flavor symmetry\, making it necessar
 y to identify the appropriate neutral mesonic partner channels. We clarify
  the neutral-sector symmetry structure and identify $\\chi_{\\pi^0}-\\chi_
 \\sigma$ as the chiral-partner splitting associated with the surviving neu
 tral non-singlet axial symmetry\, and $\\chi_{\\pi^0}-\\chi_{\\delta^0}$ a
 s the singlet $U(1)_A$ partner splitting.\nUsing fixed-scale $(2+1)$-flavo
 r HISQ ensembles with $m_\\pi\\simeq220\\\,\\mathrm{MeV}$ at vanishing mag
 netic field\, we study these observables over a broad range of temperature
 s and magnetic fields. At low temperatures\, both splittings increase with
  $eB$. At intermediate temperatures\, both splittings decrease with increa
 sing $eB$ once the field is sufficiently strong. The decrease of the singl
 et $U(1)_A$ partner splitting sets in at larger $eB$ and is milder than in
  the chiral channel. These results provide fixed-scale lattice-QCD evidenc
 e for distinct magnetic responses of the neutral chiral and singlet $U(1)_
 A$ partner susceptibility splittings.\n\nhttps://indico.itp.ac.cn/event/43
 7/contributions/2820/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2820/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral gauge theories on a disk and a slab
DTSTART;VALUE=DATE-TIME:20261010T091500Z
DTEND;VALUE=DATE-TIME:20261010T093000Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2845@indico.itp.ac.cn
DESCRIPTION:Speakers: 金龙 党 (北京大学)\nThe Standard model as a c
 hiral gauge theory is the core foundation of particle physics. Yet\, no co
 nsensus has been reached on non-perturbative formulations of chiral gauge 
 theories although a few number of promising theoretical models have been c
 onstructed. In this work\, we exam the extra dimension or domain wall ferm
 ion approach. Firstly\, we numerically tested the slab (Grabowska-Kaplan) 
 proposal in 2+1 dimensional lattice with a background gauge field and show
 ed anomaly inflow\, anomaly cancellation\, and the behaviour of the bounda
 ry chiral model under different flow of the gauge field. Secondly\, we tes
 ted a recently proposed proposal with a disk shape defect with a  boundary
  under annealing flow of the background gauge field. Similarly\, we demons
 trate the mechanism of anomaly inflow and anomaly cancellation.\n\nhttps:/
 /indico.itp.ac.cn/event/437/contributions/2845/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2845/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Chiral Crossover Line from Lee--Yang Edge Singularities
DTSTART;VALUE=DATE-TIME:20261010T090000Z
DTEND;VALUE=DATE-TIME:20261010T091500Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2841@indico.itp.ac.cn
DESCRIPTION:Speakers: 凯帆 叶 (Central China Normal University\, Instit
 ute of Particle Physics)\nWe propose a universality-based reconstruction o
 f the QCD chiral crossover line from Lee--Yang edge singularities in the c
 omplex baryon chemical potential plane[1]. The framework maps lattice-extr
 acted complex Lee--Yang-zero estimates\, treated as proxies for edge singu
 larities\, to the universal chiral Lee--Yang edge and thereby determines t
 he $\\mu_B$ dependence of both the chiral critical line in the light-quark
  chiral limit and the pseudo-critical crossover line at physical quark mas
 ses. As an illustration\, we apply the framework to Lee--Yang-zero estimat
 es recently obtained by the Wuppertal--Budapest collaboration from high-st
 atistics lattice QCD simulations. Without imposing the previously determin
 ed small-$\\mu_B$ expansion of the crossover line as input\, the reconstru
 cted curvature is consistent with existing continuum lattice-QCD results a
 t small $\\mu_B$. The fitted chiral-limit transition temperature is also c
 ompatible with existing chiral-scaling analyses. These results demonstrate
  that lattice information on Lee--Yang singularities\, combined with unive
 rsal chiral scaling\, provides a quantitatively consistent constraint on t
 he QCD crossover line within the present temperature window and establishe
 s a framework that can be systematically improved with future Lee--Yang-ze
 ro determinations.\n\n[1] H.-T. Ding\, S. Mukherjee\, P. Petreczky\, and K
 .-F. Ye\, QCD Chiral Crossover Line from Lee-Yang Edge Singularities\, arX
 iv:2608.05752 [hep-lat] (2026).\n\nhttps://indico.itp.ac.cn/event/437/cont
 ributions/2841/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2841/
END:VEVENT
BEGIN:VEVENT
SUMMARY:**Isospin-Driven Splitting of Chemical Potentials in Isobar Collis
 ions from Lattice QCD**
DTSTART;VALUE=DATE-TIME:20261010T084500Z
DTEND;VALUE=DATE-TIME:20261010T090000Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2852@indico.itp.ac.cn
DESCRIPTION:Speakers: 佳 倪 (Central China Normal University)\nStrong ma
 gnetic fields produced in relativistic heavy-ion collisions can modify con
 served-charge fluctuations and their associated chemical potentials. The R
 u and Zr isobars share the same mass number\, $A=96$\, but have different 
 charge-to-baryon ratios\, making Ru+Ru and Zr+Zr collisions a controlled s
 etting for isolating isospin effects. In this talk\, we will present first
 -principles\, continuum-estimated $(2+1)$-flavor lattice-QCD results for i
 sospin-driven splittings of conserved-charge chemical potentials near the 
 QCD crossover\, at both vanishing and nonzero external magnetic fields alo
 ng the pseudocritical line $T_{\\mathrm{pc}}(eB)$. Under strangeness neutr
 ality and the charge-to-baryon constraint $r\\equiv n_Q/n_B$\, the differe
 nce in nuclear isospin composition is mapped onto the splitting ratios $\\
 Delta\\mu_Q/\\Delta\\mu_B$\, $\\Delta\\mu_S/\\Delta\\mu_B$\, and $\\Delta\
 \mu_S/\\Delta\\mu_Q$. At vanishing magnetic field\, the lattice results yi
 eld $\\Delta\\mu_Q0$\, with the electric-charge sector dominating\, and th
 e splitting ratios are similar in magnitude to recent Bayesian extractions
  from STAR isobar data. At nonzero magnetic fields\, the splitting ratios 
 themselves vary only moderately with $eB$. A clearer field signal emerges 
 from the Ru-Zr difference in the normalized magnetic-field response: in la
 ttice QCD\, the relative response of $\\mu_Q/\\mu_B$ is substantially stro
 nger in Ru+Ru than in Zr+Zr. We also present hadron resonance gas (HRG) re
 sults and experimentally motivated proxy observables with kinematic cuts t
 o facilitate contact with experiment. These results provide first-principl
 es benchmarks for the conserved-charge response to isospin and magnetic fi
 elds in isobar collisions.\nThis talk is based on our recent work: H.-T. D
 ing\, J.-B. Gu\, A. Kumar\, and J. Ni\, arXiv:2606.30164 [hep-lat] (2026).
 \n\nhttps://indico.itp.ac.cn/event/437/contributions/2852/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2852/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leading-order dynamical QED corrections to the thermodynamics of i
 sospin-asymmetric QCD
DTSTART;VALUE=DATE-TIME:20261010T082500Z
DTEND;VALUE=DATE-TIME:20261010T084500Z
DTSTAMP;VALUE=DATE-TIME:20261005T001946Z
UID:indico-contribution-643-2806@indico.itp.ac.cn
DESCRIPTION:Speakers: 玮平 黄 (Eötvös Loránd University)\nAt large i
 sospin chemical potential $\\mu_I$ and low temperature\, QCD undergoes a s
 econd-order transition to a Bose-Einstein condensate of charged pions\, wh
 ose order is encoded in the non-analytic $\\mu_I$-dependence of the pressu
 re and of the isospin density derived from it. Including dynamical photons
  is expected\, on general grounds\, to drive this transition first order. 
 Since unequal quark charges render the QCD+QED action complex\, we avoid t
 he sign problem by expanding the pressure to $\\mathcal{O}(e^2)$ around $e
 =0$\, with the leading contribution governed by the second charge-derivati
 ve of the free energy density\, $\\partial^2 f/\\partial e^2|_{e=0}$. We e
 valuate it directly on existing isospin-asymmetric pure-QCD ensembles as a
  spacetime convolution of the Feynman-gauge photon propagator with the vec
 tor current-current correlator at nonzero $\\mu_I$ and pion source $\\lamb
 da$. The full correlator is computed using a point source and a newly prop
 osed two-dimensional planar source. We report progress toward the first la
 ttice determination of $\\partial^2 f/\\partial e^2|_{e=0}$ as a function 
 of $\\mu_I$\, which captures\, at leading order\, the imprint of dynamical
  photons on the thermodynamics across the transition.\n\nhttps://indico.it
 p.ac.cn/event/437/contributions/2806/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2806/
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