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Lattice continuum-limit study of nucleon quasi-PDFs
/ Alexandrou, Constantia (Cyprus U. ; Cyprus Inst.) ; Cichy, Krzysztof (Mickiewicz U., Poznan) ; Constantinou, Martha (Temple U.) ; Green, Jeremy R. (CERN) ; Hadjiyiannakou, Kyriakos (Cyprus U. ; Cyprus Inst.) ; Jansen, Karl (DESY) ; Manigrasso, Floriano (Cyprus U. ; Humboldt U., Berlin ; Rome U., Tor Vergata) ; Scapellato, Aurora (Mickiewicz U., Poznan) ; Steffens, Fernanda (Bonn U.)
The quasi-PDF approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first order in the lattice spacing $a$. [...]
arXiv:2011.00964; CERN-TH-2020-181; DESY-20-208.-
2021-05-18 - 24 p.
- Published in : Phys. Rev. D 103 (2021) 094512
Article from SCOAP3: PDF; Fulltext: PDF;
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Investigating efficient methods for computing four-quark correlation functions
/ Abdel-Rehim, Abdou (SUNY, Utica/Rome ; Cyprus Inst.) ; Alexandrou, Constantia (Cyprus Inst. ; Cyprus U.) ; Berlin, Joshua (Frankfurt U.) ; Dalla Brida, Mattia (INFN, Milan Bicocca ; Milan Bicocca U.) ; Finkenrath, Jacob (Cyprus Inst.) ; Wagner, Marc (Frankfurt U.)
We discuss and compare the efficiency of various methods, combinations of point-to-all propagators, stochastic timeslice-to-all propagators, the one-end trick and sequential propagators, to compute two-point correlation functions of two-quark and four-quark interpolating operators of different structure including quark-antiquark type, mesonic molecule type, diquark-antidiquark type and two-meson type. Although we illustrate our methods in the context of the $a_0(980)$, they can be applied for other multi-quark systems, where similar diagrams appear. [...]
arXiv:1701.07228; CERN-TH-2017-112.-
2017-11 - 25 p.
Fulltext: PDF;
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Magnetic Moments of Short-Lived Nuclei with Part-per-Million Accuracy: Toward Novel Applications of $\beta$-Detected NMR in Physics, Chemistry, and Biology
/ Harding, R.D. (CERN ; York U., England ; U. Nottingham) ; Pallada, S. (CERN) ; Croese, J. (CERN ; Geneva U.) ; Antušek, A. (Slovak Tech. U.) ; Baranowski, M. (Mickiewicz U., Poznan) ; Bissell, M.L. (Manchester U.) ; Cerato, L. (U. Geneva (main)) ; Dziubinska-Kühn, K.M. (CERN ; U. Leipzig (main)) ; Gins, W. (Leuven U.) ; Gustafsson, F.P. (Leuven U.) et al.
We determine for the first time the magnetic dipole moment of a short-lived nucleus with part-per-million (ppm) accuracy. To achieve this two orders of magnitude improvement over previous studies, we implement a number of innovations into our $\beta$-detected Nuclear Magnetic Resonance ($\beta$-NMR) setup at ISOLDE/CERN. [...]
arXiv:2004.02820.-
2020-12-29 - 15 p.
- Published in : Phys. Rev. X 10 (2020) 041061
Fulltext: PDF; Fulltext from Publisher: PDF;
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Quantum Computing for High-Energy Physics : State of the Art and Challenges
/ Di Meglio, Alberto (CERN) ; Jansen, Karl (DESY, Zeuthen ; Cyprus Inst.) ; Tavernelli, Ivano (IBM, Zurich) ; Alexandrou, Constantia (Cyprus U. ; Cyprus Inst.) ; Arunachalam, Srinivasan (IBM Watson Res. Ctr.) ; Bauer, Christian W. (LBNL, Berkeley) ; Borras, Kerstin (DESY ; Aachen, Tech. Hochsch.) ; Carrazza, Stefano (Milan U. ; CERN) ; Crippa, Arianna (DESY, Zeuthen ; Humboldt U., Berlin) ; Croft, Vincent (U. Leiden (main)) et al.
Quantum computers offer an intriguing path for a paradigmatic change of computing in the natural sciences and beyond, with the potential for achieving a so-called quantum advantage, namely a significant (in some cases exponential) speed-up of numerical simulations. The rapid development of hardware devices with various realizations of qubits enables the execution of small scale but representative applications on quantum computers. [...]
arXiv:2307.03236; FERMILAB-PUB-23-468-ETD.-
2024-08-01 - 49 p.
- Published in : PRX Quantum 5 (2024) 037001
Fulltext: 2307.03236 - PDF; FERMILAB-PUB-23-468-ETD - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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Parton distribution functions of $\Delta^+$ on the lattice
/ Chai, Yahui (Peking U.) ; Li, Yuan (Peking U.) ; Xia, Shicheng (Peking U.) ; Alexandrou, Constantia (Cyprus Inst. ; Cyprus U.) ; Cichy, Krzysztof (Mickiewicz U., Poznan ; CERN) ; Constantinou, Martha (Temple U.) ; Feng, Xu (Peking U. ; Peking U., Beijing ; CICQM, Beijing ; Peking U., CHEP) ; Hadjiyiannakou, Kyriakos (Cyprus Inst.) ; Jansen, Karl (NIC, Zeuthen) ; Koutsou, Giannis (Cyprus Inst.) et al.
We present results for renormalized matrix elements related to the unpolarized quasi-distribution function of the $\Delta^+$ baryon making use of the large momentum effective theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions with a clover term and pion masses of 250 MeV and 330 MeV are analyzed. [...]
arXiv:1907.09827.-
SISSA, 2019-12-16 - 7 p.
- Published in : PoS LATTICE2019 (2019) 270
Fulltext: 1907.09827 - PDF; PoS(LATTICE2019)270 - PDF;
In : 37th International Symposium on Lattice Field Theory, Wuhan, Hubei, China, 16 - 22 Jun 2019, pp.270
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Phase Transitions in Particle Physics - Results and Perspectives from Lattice Quantum Chromo-Dynamics
/ Aarts, Gert (Swansea U. ; ECT, Trento ; Fond. Bruno Kessler, Trento) ; Aichelin, Joerg (SUBATECH, Nantes) ; Allton, Chris (Swansea U.) ; Athenodorou, Andreas (INFN, Pisa ; Cyprus Inst.) ; Bachtis, Dimitrios (Swansea U., Math. Dept.) ; Bonanno, Claudio (INFN, Florence ; Madrid, IFT ; Madrid, Autonoma U.) ; Brambilla, Nora (Munich, Tech. U.) ; Bratkovskaya, Elena (Darmstadt, GSI ; Frankfurt U. ; Helmholtz Res. Acad. Hesse for FAIR) ; Bruno, Mattia (Milan Bicocca U. ; INFN, Milan Bicocca) ; Caselle, Michele (Turin U.) et al.
Phase transitions in a non-perturbative regime can be studied by ab initio Lattice Field Theory methods. The status and future research directions for LFT investigations of Quantum Chromo-Dynamics under extreme conditions are reviewed, including properties of hadrons and of the hypothesized QCD axion as inferred from QCD topology in different phases. [...]
arXiv:2301.04382.-
2023-07-20 - 94 p.
- Published in : Prog. Part. Nucl. Phys. 133 (2023) 104070
Fulltext: PDF;
In : Axions across boundaries between Particle Physics, Astrophysics, Cosmology and forefront Detection Technologies, Florence, Italy, 26 Apr - 9 Jun 2023
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Precision test of many-body QED in the Be$^{+} 2p$ fine structure doublet using short-lived isotopes
/ IS449 collaboration
Absolute transition frequencies of the $2s\; ^2{\rm S}_{1/2} \rightarrow 2p\;^2\mathrm{P}_{1/2,3/2}$ transitions in Be$^+$ were measured for the isotopes $^{7,9-12}$Be. The fine structure splitting of the $2p$ state and its isotope dependence are extracted and compared to results of \textit{ab initio} calculations using explicitly correlated basis functions, including relativistic and quantum electrodynamics effects at the order of $m \alpha^6$ and $m \alpha^7 \ln \alpha$. [...]
arXiv:1507.03830; CERN-ISOLDE-2015-006; CERN-ISOLDE-2015-006.-
2015-07-13 - 5 p.
- Published in : Phys. Rev. Lett. 115 (2015) 033002
APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
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