HU+DESY Lattice Seminars
This seminar series is organised jointly by the NIC Research Group at DESY Zeuthen and the Theory of Elementary Particles and Computational Theoretical Physics research groups of the Institute for Physics at Humboldt University. For questions please contact Dr. Lorenzo Barca (DESY Zeuthen).
Some seminars will be held in person and some on zoom, generally on Mondays at 13:15. Due to the participation of international speakers some seminars may start at 15:00. Please check the individual dates. The Zoom connection details will be announced via the lat-bb mailing list. In-person seminars will be in the IRIS building in Adlershof (zum Großen Windkanal 2), but the room may change.
iCal link: https://indico.desy.de/export/categ/873.ics?from=-31d
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For past events, visit the Indico page.
Resolving left-hand cut issues in the Lüscher scattering formalism
Speaker:
Mr Baião Raposo, André (University of Edinburgh)
Date: Monday, April 22, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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iCal
The well-known Lüscher method is widely used in extracting scattering amplitudes from finite-volume spectrum data. Recent lattice QCD calculations involving systems in which a lighter particle can couple to heavier scatterers (e.g. nucleon-nucleon, DD* scattering) have highlighted some limitations of this standard formalism when continued far enough below the two-particle threshold. This is due to the presence of left-hand cuts in the angular-momentum-projected scattering amplitudes. In this talk, I describe a relativistic model-independent extension of the existing formalism, which circumvents these issues. I discuss also the full workflow for extracting scattering amplitudes and its implementation.
TBD
Date: Monday, April 29, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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TBD
Date: Monday, May 6, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
Indico
iCal
Two-pole structure of the $\Lambda(1405)$: A Lattice QCD study of the coupled-channel $\pi\Sigma-\bar{K}N$
Speaker:
Ms Cid-Mora, Bárbara (University of Darmstadt)
Date: Monday, May 13, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
Indico
iCal
This talk presents the results of the first coupled-channel meson-baryon $\pi\Sigma-\bar{K}N$ calculation from lattice QCD in the $\Lambda(1405)$ region. The relevant methods to compute correlation functions and extract finite-volume energy spectra are presented, as well as the method to study scattering amplitudes. This study was carried out using a single ensemble with pion mass $m_{\pi}=200$ MeV and kaon mass $m_K = 487$ MeV, and included additional sets of multi-hadron operators. Once the stationary-state energy levels were reliably extracted, the Lüscher formalism was employed to study scattering amplitudes. The final results are consistent with the two-pole picture, where every parametrization of the two-channel $\textit{K}$-matrix exhibits two poles in the complex energy plane. The location of these poles corresponds to a virtual bound state below the $\pi\Sigma$ threshold and a resonance pole below the $\bar{K}N$.
TBD
Date: Monday, May 27, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
Indico
iCal
The muon anomalous magnetic moment
Speaker:
Prof. Golterman, Maarten (University of San Francisco)
Date: Monday, June 3, 2024
Time: 4:00 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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iCal
TBD
Date: Monday, June 10, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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iCal
Multilevel samplings for glueball calculations: from pure gauge to quenched simulations
Speaker:
Dr Barca, Lorenzo (Z_ZPPT (Zeuthen Particle PhysicsTheory))
Date: Monday, June 17, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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TBD
Date: Monday, June 24, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
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iCal
TBD
Date: Monday, July 1, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
Indico
iCal
TBD
Date: Monday, July 8, 2024
Time: 1:15 pm (Europe/Berlin)
Location: IRIS 1.207
Links:
Indico
iCal