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Lattice Evidence for Bound Heavy Tetraquarks / Francis, Anthony (CERN) ; Hudspith, Renwick J (York U., Canada) ; Lewis, Randy (York U., Canada) ; Maltman, Kim (York U., Canada ; Adelaide U., Sch. Chem. Phys.)
We investigate the possibility of $qq'\bar{Q}\bar{Q}'$ tetraquark bound states using $n_f = 2 + 1$ lattice QCD with pion masses $\simeq 164, 299$ and 415 MeV. Two types of lattice interpolating operator are chosen, reflecting first diquarkantidiquark and second meson-meson structure. [...]
2019 - 6 p. - Published in : EPJ Web Conf. 202 (2019) 06013 Fulltext: PDF;
In : The 9th International Workshop on Charm Physics (CHARM 2018), Novosibirsk, Russian Federation, 21 - 25 May 2018, pp.06013

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(91)

Lattice predictions for bound heavy tetraquarks / Francis, Anthony (CERN) ; Hudspith, Renwick J (York U., Canada) ; Lewis, Randy (York U., Canada) ; Maltman, Kim (York U., Toronto (main) ; Adelaide U., Sch. Chem. Phys.)
We investigate the possibility of doubly heavy $qq^\prime \bar Q \bar Q^\prime$ tetraquark bound states using $n_f=2+1$ lattice QCD with pion masses $\simeq 164$, $299$ and $415$ MeV. Two types of lattice interpolating operator are chosen, reflecting first diquark-antidiquark and second meson-meson structure. [...]
SISSA, 2019 - 4 p. - Published in : PoS ICHEP2018 (2019) 257 Fulltext from publisher: PDF;
In : XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018, pp.257

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(78)

Ruling out some predictions of deeply-bound light-heavy tetraquarks using lattice QCD / Colquhoun, Brian (York U., Canada) ; Francis, Anthony (U. Bern, AEC ; CERN ; NYCU, Hsinchu) ; Hudspith, Renwick (Mainz U., Inst. Kernphys. ; U. Mainz, PRISMA) ; Lewis, Randy (York U., Canada) ; Maltman, Kim (York U., Toronto (main) ; Adelaide U., Sch. Chem. Phys.)
We discuss our lattice QCD calculations of a number of tetraquark channels with at least one heavy quark where some phenomenological models, already fully constrained by fits to the ordinary meson and baryon spectrum, predict deep binding. We find no evidence of deeply-bound tetraquarks, except in previously established strong-interaction stable $I=0$, $J^P=1^+$, $ud\bar{b}\bar{b}$ and $I=1/2$, $J^P=1^+$ $\ell s\bar{b}\bar{b}$ (where $\ell=u/d$) channels, allowing us to rule out models predicting deep binding. [...]
2022 - 5 p. - Published in : Rev. Mex. Fis. Suppl. 3 (2022) 0308044 Fulltext: PDF;
In : XIX International Conference on Hadron Spectroscopy and Structure (Hadron 2021), Mexico City, Mexico, 26 Jul - 1 Aug 2021, pp.0308044

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(76)

Evidence for charm-bottom tetraquarks and the mass dependence of heavy-light tetraquark states from lattice QCD / Francis, Anthony (CERN) ; Hudspith, Renwick J. (York U., Canada) ; Lewis, Randy (York U., Canada) ; Maltman, Kim (York U., Canada)
We continue our study of heavy-light four-quark states and find evidence from lattice QCD for the existence of a strong-interaction-stable $I(J^P)=0(1^+)$ $ud\bar{c}\bar{b}$ tetraquark with mass in the range of 15 to 61 MeV below $\bar{D}B^*$ threshold. Since this range includes the electromagnetic $\bar{D}B\gamma$ decay threshold, current uncertainties do not allow us to determine whether such a state would decay electromagnetically, or only weakly. [...]
arXiv:1810.10550; CERN-TH-2018-227.- 2019-03-22 - 16 p. - Published in : Phys. Rev. D 99 (2019) 054505 Article from SCOAP3: PDF; Fulltext: PDF;

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(38)

A lattice investigation of exotic tetraquark channels / Hudspith, R.J. (U. Mainz, PRISMA) ; Colquhoun, B. (York U., Canada) ; Francis, A. (CERN) ; Lewis, R. (York U., Canada) ; Maltman, K. (York U., Canada ; Adelaide U., Sch. Chem. Phys.)
We perform an $n_f=2+1$ lattice study of a number of channels where past claims exist in the literature for the existence of strong-interaction-stable light-heavy tetraquarks. We find no evidence for any such deeply-bound states, beyond the $J^P=1^+$, $I=0$ $ud\bar{b}\bar{b}$ and $I=1/2$ $ls\bar{b}\bar{b}$ states already identified in earlier lattice studies. [...]
arXiv:2006.14294.- 2020-12-08 - 41 p. - Published in : Phys. Rev. D 102 (2020) 114506 Article from SCOAP3: PDF; Fulltext: PDF;

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(22)

Diquark properties from full QCD lattice simulations / Francis, Anthony (Bern U.) ; de Forcrand, Philippe (CERN) ; Lewis, Randy (York U., Canada) ; Maltman, Kim (York U., Canada ; Adelaide U.)
We study diquarks on the lattice in the background of a static quark, in a gauge-invariant formalism with quark masses down to almost physical $m_\pi$. We determine mass differences between diquark channels as well as diquark-quark mass differences. [...]
arXiv:2106.09080.- 2022-05-10 - 9 p. - Published in : JHEP 2205 (2022) 062 Fulltext: document - PDF; 2106.09080 - PDF;

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(20)

Shapes and sizes of diquarks in lattice QCD / Francis, Anthony (NYCU, Hsinchu) ; de Forcrand, Philippe (CERN) ; Lewis, Randy (York U., Toronto (main)) ; Maltman, Kim (York U., Toronto (main) ; Adelaide U., Sch. Chem. Phys.)
The idea of diquarks as effective degrees of freedom in QCD has been a successful concept in explaining observed hadron spectra. Recently they have also played an important role in studying doubly heavy tetraquarks in phenomenology and on the lattice. [...]
2022 - 6 p. - Published in : PoS: ICHEP2022, pp. 795
Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.795

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Recommendations of the Finance Committee to Council as to the Financing of the 1965 Supplementary Programme
Recommandations du Comité des Finances au Conseil au sujet du financement du programme supplémentaire pour 1965
CERN/0572
28th Session of Council ; 1964
English: PDF
French: PDF

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Expenditure in Excess of Provisions
Dépassements de crédits
CERN/FC/0726/Add.
64th Meeting of Finance Committee ; 1964
English: PDF
French: PDF

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10.

List of Participants
Liste des participants
CERN/FC/0740
64th Meeting of Finance Committee ; 1964
English: PDF
French: PDF

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