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TH Articles

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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, 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
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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2022-09-20
14:43
New sum rules for the B$_{c}$→ J/ψ form factors / Bordone, Marzia (CERN) ; Khodjamirian, Alexander (Siegen U.) ; Mannel, Th. (Siegen U.)
We derive new sum rules for the form factors of the $B_c\to J/\psi\, \ell \bar{\nu}_\ell$ semileptonic transitions, employing the vacuum-to-$B_c$ correlation function of the $J/\psi$-interpolating and $b\to c$ weak currents. In the heavy quark limit and at a space-like momentum transfer to the weak current, a local operator-product expansion is valid for this correlation function. [...]
arXiv:2209.08851; SI-HEP-2022-26; P3H-22-094; CERN-TH-2022-144.- 2023-01-09 - 33 p. - Published in : JHEP 2301 (2023) 032 Fulltext: Publication - PDF; 2209.08851 - PDF;

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2022-09-15
04:22
Current and Future γ-Ray Searches for Dark Matter Annihilation Beyond the Unitarity Limit / Tak, Donggeun (DESY, Zeuthen) ; Baumgart, Matthew (Arizona State U.) ; Rodd, Nicholas L. (CERN) ; Pueschel, Elisa (DESY, Zeuthen)
For decades, searches for electroweak-scale dark matter (DM) have been performed without a definitive detection. This lack of success may hint that DM searches have focused on the wrong mass range. [...]
arXiv:2208.11740; CERN-TH-2022-139; DESY-22-138.- 2022-10-12 - 10 p. - Published in : Astrophys. J. Lett. 938 (2022) L4 Fulltext: document - PDF; 2208.11740 - PDF;

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2022-07-29
04:07
A parton branching with transverse momentum dependent splitting functions / Hautmann, F. (Antwerp U. ; CERN ; Oxford U.) ; Hentschinski, M. (Americas U., Puebla) ; Keersmaekers, L. (Antwerp U.) ; Kusina, A. (Cracow, INP) ; Kutak, K. (Cracow, INP) ; Lelek, A. (Antwerp U.)
Off-shell, transverse-momentum dependent splitting functions can be defined from the high-energy limit of partonic decay amplitudes. Based on these splitting functions, we construct Sudakov form factors and formulate a new parton branching algorithm. [...]
arXiv:2205.15873; CERN-TH-2022-087; IFJPAN-IV-2022-8.- 2022-05-31 - 8 p. Fulltext: PDF;

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2022-07-19
04:48
Zero-jettiness beam functions at N$^3$LO / Behring, Arnd (KIT, Karlsruhe, TTP)
The zero-jettiness beam functions describe collinear emissions from initial state legs and appear in the factorisation theorem for cross sections in the limit of small zero-jettiness. They are an important building block for slicing schemes for colour-singlet production at hadron colliders. [...]
arXiv:2207.07630; CERN-TH-2022-120; TTP22-047; P3H-22-075.- 2022-10-20 - 12 p. - Published in : PoS LL2022 (2022) 027 Fulltext: 2207.07630 - PDF; document - PDF;
In : 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022, Ettal, Germany, 25 - 30 Apr 2022, pp.027

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2022-07-13
04:01
Flavour Physics Phenomenology with SuperIso / Neshatpour, Siavash (INFN, Naples) ; Mahmoudi, Farvah (IP2I, Lyon ; CERN)
We present an overview of SuperIso v4.1 which is a public program for the calculation of flavour physics observables. We give examples of using SuperIso to constrain new physics scenarios with kaon physics and present the implications of rare B-decays..
arXiv:2207.04956; CERN-TH-2022-119.- 2022-07-14 - 9 p. - Published in : PoS CompTools2021 (2022) 010 Fulltext: 2207.04956 - PDF; document - PDF;
In : Computational Tools for High Energy Physics and Cosmology, Lyon, France, 22 - 26 Nov 2021, pp.010

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2022-07-01
06:29
Anatomy of kaon decays and prospects for lepton flavour universality violation / D'Ambrosio, G. (INFN, Naples) ; Iyer, A.M. (Indian Inst. Tech., New Delhi) ; Mahmoudi, F. (IP2I, Lyon ; CERN) ; Neshatpour, S. (INFN, Naples)
The kaon sector is characterised by several processes which are under active investigation across different experiments. In this work, we present the global picture that emerges from a study of the different decay modes. [...]
arXiv:2206.14748; CERN-TH-2022-101.- 2022-09-19 - 31 p. - Published in : JHEP 2209 (2022) 148 Fulltext: document - PDF; 2206.14748 - PDF;

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2022-06-09
04:08
Cosmology with the Redshift-Space Galaxy Bispectrum Monopole at One-Loop Order / Philcox, Oliver H.E. (Princeton U., Astrophys. Sci. Dept. ; Princeton, Inst. Advanced Study) ; Ivanov, Mikhail M. (Princeton, Inst. Advanced Study) ; Cabass, Giovanni (Princeton, Inst. Advanced Study) ; Simonović, Marko (CERN) ; Zaldarriaga, Matias (Princeton, Inst. Advanced Study) ; Nishimichi, Takahiro (Kyoto U., Yukawa Inst., Kyoto ; Tokyo U., IPMU)
We study the cosmological information content of the redshift-space galaxy bispectrum monopole at one-loop order in perturbation theory. We incorporate all effects necessary for comparison to data: fourth-order galaxy bias, infrared resummation (accounting for the non-linear evolution of baryon acoustic oscillations), ultraviolet counterterms, non-linear redshift-space distortions, stochastic contributions, projection, and binning effects. [...]
arXiv:2206.02800; CERN-TH-2022-092; YITP-22-60.- 2022-08-15 - 32 p. - Published in : Phys. Rev. D 106 (2022) 043530 Fulltext: PhysRevD.106.043530 - PDF; 2206.02800 - PDF;

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2022-06-04
04:07
Axiogenesis with a Heavy QCD Axion / Co, Raymond T. (Minnesota U., Theor. Phys. Inst. ; Minnesota U.) ; Gherghetta, Tony (Minnesota U.) ; Harigaya, Keisuke (CERN)
We demonstrate that the observed cosmological excess of matter over antimatter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space, which is transferred into a baryon asymmetry through weak and strong sphaleron processes. [...]
arXiv:2206.00678; UMN-TH-4124/22; FTPI-MINN-22/15; CERN-TH-2022-090.- 2022-10-19 - 32 p. - Published in : JHEP 2210 (2022) 121 Fulltext: document - PDF; 2206.00678 - PDF;

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