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2023-03-24
04:58
Deep Learning Searches for Vector-Like Leptons at the LHC and Electron/Muon Colliders / Morais, António P. (Aveiro U. ; U. Aveiro (main) ; CERN) ; Onofre, António (LIP, Minho) ; Freitas, Felipe F. (Aveiro U. ; U. Aveiro (main)) ; Gonçalves, João (Aveiro U. ; U. Aveiro (main)) ; Pasechnik, Roman (Lund U.) ; Santos, Rui (Lisbon U., CFTC ; Lisbon, ISEL)
The discovery potential of both singlet and doublet vector-like leptons (VLLs) at the Large Hadron Collider (LHC) as well as at the not-so-far future muon and electron machines is explored. The focus is on a single production channel for LHC direct searches while double production signatures are proposed for the leptonic colliders. [...]
arXiv:2108.03926; CERN-TH-2022-217.- 2023-03-21 - 26 p. - Published in : Eur. Phys. J. C 83 (2023) 232 Fulltext: document - PDF; 2108.03926 - PDF;

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2023-03-14
09:08
CDF II W-mass anomaly faces first-order electroweak phase transition / Addazi, Andrea (SCU, Chengdu ; Frascati) ; Marciano, Antonino (Frascati ; Fudan U.) ; Morais, António P. (Aveiro U.) ; Pasechnik, Roman (Lund U., Dept. Theor. Phys.) ; Yang, Hao (Fudan U.)
We suggest an appealing strategy to probe a large class of scenarios beyond the Standard Model simultaneously explaining the recent CDF II measurement of the $W$ boson mass and predicting first-order phase transitions (FOPT) testable in future gravitational-wave (GW) experiments. Our analysis deploys measurements from the GW channels and high energy particle colliders. [...]
arXiv:2204.10315; CERN-TH-2023-039.- 2023-03-10 - 6 p. - Published in : Eur. Phys. J. C Fulltext: document - PDF; 2204.10315 - PDF;

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2023-01-26
09:09
A quantum analytical Adam descent through parameter shift rule using Qibo / Carrazza, Stefano (Milan U. ; CERN ; Technol. Innovation Inst., UAE) ; Robbiati, Matteo (Milan U. ; CERN) ; Efthymiou, Stavros (Technol. Innovation Inst., UAE) ; Pasquale, Andrea (Milan U. ; Technol. Innovation Inst., UAE)
In this proceedings we present quantum machine learning optimization experiments using stochastic gradient descent with the parameter shift rule algorithm. We first describe the gradient evaluation algorithm and its optimization procedure implemented using the Qibo framework. [...]
arXiv:2210.10787; CERN-TH-2022-168; TIF-UNIMI-2022-20.- 2022-11-13 - 6 p. - Published in : PoS: ICHEP2022 (2022) , pp. 206
Fulltext: 2210.10787 - PDF; document - PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.206

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2023-01-26
09:09
Toward the ultimate reach of current imaging atmospheric Cherenkov telescopes and their sensitivity to TeV dark matter / Montanari, Alessandro (IRFU, Saclay, DPP) ; Moulin, Emmanuel (IRFU, Saclay, DPP) ; Rodd, Nicholas L. (CERN)
Indirect detection opens a unique window for probing thermal dark matter (DM): the same annihilation process that determined the relic abundance in the early Universe drives the present day astrophysical signal. While TeV-scale particles weakly coupled to the Standard Model face undoubted challenges from decades of null searches, the scenario remains compelling, and simple realizations such as Higgsino DM remain largely unexplored. [...]
arXiv:2210.03140; CERN-TH-2022-156; IRFU-22-02.- 2023-02-15 - 23 p. - Published in : Phys. Rev. D 107 (2023) 043028 Fulltext: PDF;

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2023-01-26
08:21
Hadronic observables from master-field simulations / Cè, Marco (Bern U.) ; Bruno, Mattia (Milan Bicocca U. ; INFN, Milan Bicocca) ; Bulava, John (DESY, Zeuthen) ; Francis, Anthony (NYCU, Hsinchu) ; Fritzsch, Patrick (Trinity Coll., Dublin ; Hamilton Math. Inst., Dublin) ; Green, Jeremy R. (DESY, Zeuthen) ; Hansen, Maxwell T. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Rago, Antonio (Southern Denmark U., CP3-Origins ; CERN)
Substantial progress has been made recently in the generation of master-field ensembles. This has to be paired with efficient techniques to compute observables on gauge field configurations with a large volume. [...]
arXiv:2301.05156; DESY-22-207; CERN-TH-2022-215.- 2023-01-27 - 10 p. - Published in : PoS LATTICE2022 (2023) 052 Fulltext: document - PDF; 2301.05156 - PDF;
In : 39th International Symposium on Lattice Field Theory (Lattice 2022), Bonn, Germany, 8 - 13 Aug 2022, pp.052

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2023-01-26
08:14
QCD resummation for groomed jet observables at NNLL+NLO / Dasgupta, Mrinal (Manchester U. ; CERN) ; El-Menoufi, Basem Kamal (Manchester U.) ; Helliwell, Jack (Oxford U., Theor. Phys.)
We use a direct QCD approach to carry out the next-to-next-to-leading logarithmic (NNLL) resummation for observables groomed with the modified mass-drop tagger (Soft Drop $\beta=0$). We focus on observables which are additive given an arbitrary number of soft-collinear emissions. [...]
arXiv:2211.03820; CERN-TH-2022-170.- 2023-01-11 - 35 p. - Published in : JHEP 2301 (2023) 045 Fulltext: document - PDF; 2211.03820 - PDF;

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2022-12-21
04:11
LapH interpolating fields with open boundary conditions / Della Morte, Michele (Southern Denmark U., CP3-Origins) ; Francesconi, Olmo (Southern Denmark U., CP3-Origins) ; Tsang, Justus Tobias (CERN)
The stochastic Laplacian Heaviside (LapH) method has proven to be successful in hadronic calculations. In this work, with charm-light spectroscopy in mind, we set up and optimise the LapH procedure limiting ourselves to the evaluation of two-point mesonic correlation functions. [...]
arXiv:2212.09695; CERN-TH-2022-212.- 2023-01-05 - 8 p. - Published in : PoS LATTICE2022 (2023) 260 Fulltext: document - PDF; 2212.09695 - PDF;
In : 39th International Symposium on Lattice Field Theory (Lattice 2022), Bonn, Germany, 8 - 13 Aug 2022, pp.260

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2022-12-07
04:50
Antipodal Self-Duality for a Four-Particle Form Factor / Dixon, Lance J. (SLAC) ; Gürdoğan, Ömer (Southampton U.) ; Liu, Yu-Ting (SLAC ; Santa Barbara, KITP) ; McLeod, Andrew J. (CERN ; UCLA) ; Wilhelm, Matthias (Bohr Inst.)
We bootstrap the symbol of the maximal-helicity-violating four-particle form factor for the chiral part of the stress-tensor supermultiplet in planar $\mathcal{N}=4$ super-Yang-Mills theory at two loops. When minimally normalized, this symbol involves only 34 letters and obeys the extended Steinmann relations in all partially-overlapping three-particle momentum channels. [...]
arXiv:2212.02410; CERN-TH-2022-190; SLAC-PUB-17711.- 2023-03-16 - 9 p. - Published in : Phys. Rev. Lett. 130 (2023) 111601 Fulltext: 2212.02410 - PDF; Publication - PDF;

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2022-11-24
04:03
Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses / Boyle, Peter (Brookhaven ; Edinburgh U.) ; Di Carlo, Matteo (Edinburgh U.) ; Erben, Felix (Edinburgh U.) ; Gülpers, Vera (Edinburgh U.) ; Hansen, Maxwell T. (Edinburgh U.) ; Harris, Tim (Edinburgh U.) ; Hermansson-Truedsson, Nils (Bern U. ; Lund U., Dept. Theor. Phys.) ; Hodgson, Raoul (Edinburgh U.) ; Jüttner, Andreas (Southampton U. ; CERN) ; hÓgáin, Fionn Ó. (Edinburgh U.) et al.
The decreasing uncertainties in theoretical predictions and experimental measurements of several hadronic observables related to weak processes, which in many cases are now smaller than $\mathrm{O}(1\%)$, require theoretical calculations to include subleading corrections that were neglected so far. Precise determinations of leptonic and semi-leptonic decay rates, including QED and strong isospin-breaking effects, can play a central role in solving the current tensions in the first-row unitarity of the CKM matrix. [...]
arXiv:2211.12865; CERN-TH-2022-193; LU-TP 22-59.- 2023-02-27 - 66 p. - Published in : JHEP 2302 (2023) 242 Fulltext: document - PDF; 2211.12865 - PDF;

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2022-11-17
04:09
Two-loop form factors for pseudo-scalar quarkonium production and decay / Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Becchetti, Matteo (INFN, Turin) ; Duhr, Claude (U. Bonn, Phys. Inst., BCTP) ; Ozcelik, Melih A. (IJCLab, Orsay ; Karlsruhe U., TTP)
We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $\gamma \gamma \leftrightarrow {^1S_0^{[1]}}$, that was previously known only numerically, as well as for the processes $gg \leftrightarrow {^1S_0^{[1]}}$, $\gamma g \leftrightarrow {^1S_0^{[8]}}$ and $gg \leftrightarrow {^1S_0^{[8]}}$, which have not been computed before. [...]
arXiv:2211.08838; BONN-TH-2022-23; CERN-TH-2022-187; TTP22-068.- 2023-02-27 - 37 p. - Published in : JHEP 2302 (2023) 250 Fulltext: document - PDF; 2211.08838 - PDF;

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