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SUMMARY:Sliding Composite Dark Matter
DTSTART;VALUE=DATE-TIME:20260618T030000Z
DTEND;VALUE=DATE-TIME:20260618T040000Z
DTSTAMP;VALUE=DATE-TIME:20260618T162500Z
UID:indico-event-5115@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Lingfeng Li（李凌风） (Nanjing Normal Universit
 y)\n\nAbstract: We present a scenario for GeV-scale thermal dark matter t
 hat can only be tested with accelerator experiments. Dark matter is compos
 ed of dark pions arising from a confining strong interaction in the dark s
 ector.The thermal relic density is obtained through the interplay of up-sc
 atterings of dark pions to heavier dark mesons (the dark counterparts of t
 he kaons and $\\eta$)\, and decays of the unstable dark $\\eta$ to Standar
 d Model particles. This mechanism is analogous to a playground slide\, whe
 re one climbs up first and then slides down with a release of energy. We i
 llustrate the scenario with a minimal model based on the $SU(3)/SO(3)$ cos
 et\, where dark matter is stabilized by a $U(1)$ flavor symmetry. The corr
 ect relic density is obtained with dark meson mass splittings of $10\\%$ t
 o $50\\%$ and a dark-$\\eta$ lifetime shorter than $10^3\\\,\\mathrm{m}/c$
 . Direct and indirect dark matter searches are mostly ineffective\, as a c
 onsequence of the charge conjugation symmetry of the stabilizing $U(1)$. T
 he most striking signals arise at the LHC\, from the production of dark sh
 owers containing long-lived dark $\\eta$’s that decay to visible final s
 tates. These signatures crucially depend on the portal interaction connect
 ing the dark sector to the Standard Model. We show that several well-known
  portals can complete the scenario above the weak scale\,and outline the e
 xpected signals in each case.Biography：Lingfeng Li graduated from Peking
  University in 2013 and received his PhD in Theoretical High Energy Physic
 s from the University of California\, Davis in 2018 under the supervision 
 of Prof. Hsin-Chia Cheng. Then he worked at HKUST and Brown University as 
 a Postdoctoral Researcher. He is interested in precision tests of the Stan
 dard Model and probing new physics with new models\, methods\, and mindset
 s.Alternative online link: https://meeting.tencent.com/dm/PNtk4dyG384dID: 
 810937353\n\nhttps://indico-tdli.sjtu.edu.cn/event/5115/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5115/
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