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SUMMARY:Lattice QCD study of the $K^*(892)$ resonance at the physical poin
 t
DTSTART;VALUE=DATE-TIME:20261010T033000Z
DTEND;VALUE=DATE-TIME:20261010T040000Z
DTSTAMP;VALUE=DATE-TIME:20261005T105507Z
UID:indico-contribution-2832@indico.itp.ac.cn
DESCRIPTION:Speakers: 衢智 李 (Sichuan University)\nWe present a lattic
 e QCD study of the $K^*(892)$ resonance using\n	eight $N_f=2+1$ Wilson-Clo
 ver ensembles with three lattice spacings\n	and six pion masses ranging fr
 om 135 to 320 MeV. For each ensemble\,\n	a large number of finite volume e
 nergy levels in the $P$-wave $K\\pi$\n	channel are determined. The energy 
 dependence of the scattering\n	phase shift is then obtained from L\\"usche
 r’s finite-volume\n	method. To systematically assess parametrization dep
 endence\, the\n	amplitude is described using three different models\, whic
 h yield\n	consistent results. The resulting phase shifts show a clear reso
 nant\n	behavior for all ensembles\, and the corresponding $K^*(892)$\n	res
 onance pole is identified on the second Riemann sheet in the\n	complex ene
 rgy plane. The pole positions are extrapolated to the\n	physical pion mass
  and the continuum limit\, yielding a $K^*(892)$\n	resonance located at $\
 \sqrt{s_0} = [883.0(6.9) -i20.1(2.2)]\\mathrm{ MeV}$\,\n	which is in excel
 lent agreement with the experimental value. This\n	study provides a first-
 principles QCD determination of the\n	$K^*(892)$ mass and width  with esti
 mated systematic uncertainties.\n\nhttps://indico.itp.ac.cn/event/437/cont
 ributions/2832/
LOCATION:会议楼2 CXII401
URL:https://indico.itp.ac.cn/event/437/contributions/2832/
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