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TH Articles

Derniers ajouts:
2020-02-21
04:32
Chaotic inflation with four-form couplings / Lee, Hyun Min (Chung-Ang U.)
We consider chaotic inflation models with a pseudo-scalar field containing the general couplings to the four-form flux. The four-form mixing with the pseudo-scalar field induces a quadratic potential for inflaton while the coexisting four-form mixing with graviton generates a non-minimal gravity coupling for inflaton. [...]
arXiv:1908.05475; CERN-TH-2019-228.- 2020-02-20 - 6 p. - Published in : Phys. Rev. D 101 (2020) 043523 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-02-21
04:32
Relaxation of Higgs mass and cosmological constant with four-form fluxes and reheating / Lee, Hyun Min (Chung-Ang U.)
We consider the most general effective action for the four-form fluxes in the Standard Model coupled to gravity. The Higgs mass parameter can be relaxed to a correct value due to the four-form coupling to the Higgs field and it stops changing due to an extremely suppressed transition probability from the observed cosmological constant to AdS space. [...]
arXiv:1908.04252; CERN-PH-TH/2019-196; CERN-TH-2019-196.- 2020-01-08 - 14 p. - Published in : JHEP 2001 (2020) 045 Article from SCOAP3: PDF; Fulltext: PDF;

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2020-01-07
04:04
Three-loop contributions to the $\rho$ parameter and iterated integrals of modular forms / Abreu, Samuel (Louvain U., CP3) ; Becchetti, Matteo (Louvain U., CP3) ; Duhr, Claude (CERN) ; Marzucca, Robin (Durham U., IPPP)
We compute fully analytic results for the three-loop diagrams involving two different massive quark flavours contributing to the $\rho$ parameter in the Standard Model. We find that the results involve exactly the same class of functions that appears in the well-known sunrise and banana graphs, namely elliptic polylogarithms and iterated integrals of modular forms. [...]
arXiv:1912.02747; CERN-TH-2019-210; CP3-19-53; IPPP/19/90.- 2020-02-07 - 38 p. - Published in : JHEP 2002 (2020) 050 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-12-04
04:54
Algorithms and tools for iterated Eisenstein integrals / Duhr, Claude (CERN) ; Tancredi, Lorenzo (Oxford U., Theor. Phys.)
We present algorithms to work with iterated Eisenstein integrals that have recently appeared in the computation of multi-loop Feynman integrals. These algorithms allow one to analytically continue these integrals to all regions of the parameter space, and to obtain fast converging series representations in each region. [...]
arXiv:1912.00077; CERN-TH-2019-209; OUTP-19-14P.- 2020-02-18 - 48 p. - Published in : JHEP 2002 (2020) 105 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-11-23
05:00
Generalized covariant prescriptions for averaging cosmological observables / Fanizza, Giuseppe (INFN, Pisa ; U. Lisbon (main)) ; Gasperini, Maurizio (Bari U. ; INFN, Bari) ; Marozzi, Giovanni (Pisa U. ; INFN, Pisa) ; Veneziano, Gabriele (CERN ; College de France)
We present two new covariant and general prescriptions for averaging scalar observables on spatial regions typical of the observed sources and intersecting the past light-cone of a given observer. One of these prescriptions is adapted to sources exactly located on a given space-like hypersurface, the other applies instead to situations where the physical location of the sources is characterized by the experimental "spread" of a given observational variable. [...]
arXiv:1911.09469; BA-TH/721-19; CERN-TH-2019-183.- 2020-02-14 - 29 p. - Published in : JCAP 2002 (2020) 017 Fulltext: PDF;

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2019-11-21
04:03
Strong integrability of $\lambda$-deformed models / Georgiou, George (Athens U.) ; Sfetsos, Konstantinos (Athens U.) ; Siampos, Konstantinos (Athens U. ; CERN)
We study the notion of strong integrability for classically integrable $\lambda$-deformed CFTs and coset CFTs. To achieve this goal we employ the Poisson brackets of the spatial Lax matrix which we prove that it assumes the Maillet $r/s$-matrix algebra. [...]
arXiv:1911.07859; CERN-TH-2019-186.- 2020-03 - 19 p. - Published in : Nucl. Phys. B 952 (2020) 114923 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-11-21
04:03
Light quark masses in N_f = 2+1 lattice QCD with Wilson fermions / Bruno, Mattia (CERN) ; Campos, Isabel (Cantabria Inst. of Phys.) ; Fritzsch, Patrick (CERN) ; Koponen, Jonna (KEK, Tsukuba) ; Pena, Carlos (Madrid, Autonoma U. ; Madrid, IFT) ; Preti, David (INFN, Turin) ; Ramos, Alberto (Trinity Coll., Dublin) ; Vladikas, Anastassios (INFN, Rome2) /ALPHA Collaboration
We present a lattice QCD determination of light quark masses with three sea-quark flavours ($N_f = 2+1$). Bare quark masses are known from PCAC relations in the framework of CLS lattice computations with a non-perturbatively improved Wilson-Clover action and a tree-level Symanzik improved gauge action. [...]
arXiv:1911.08025; CERN-TH-2019-174; IFT-UAM/CSIC-19-151; KEK-CP-372.- 2020-02-22 - 18 p. - Published in : Eur. Phys. J. C 80 (2020) 169 Fulltext: PDF; External link: Published fulltext

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2019-11-13
11:31
Long-range electroweak amplitudes of single hadrons from Euclidean finite-volume correlation functions / Briceño, Raúl A. (Jefferson Lab ; Old Dominion U. (main)) ; Davoudi, Zohreh (Maryland U. ; Wako, RIKEN) ; Hansen, Maxwell T. (CERN) ; Schindler, Matthias R. (U. South Carolina, Columbia) ; Baroni, Alessandro (U. South Carolina, Columbia ; Los Alamos Natl. Lab., Theor. Div.)
A relation is presented between single-hadron long-range matrix elements defined in a finite Euclidean spacetime, and the corresponding infinite-volume Minkowski amplitudes. This relation is valid in the kinematic region where any number of two-hadron states can simultaneously go on shell, so that the effects of strongly-coupled intermediate channels are included. [...]
arXiv:1911.04036; JLAB-THY-19-3051; CERN-TH-2019-189; UMD-PP-019-06.- 2020-02-01 - 20 p. - Published in : Phys. Rev. D 101 (2020) 014509 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-11-09
04:14
QCD, from its inception to its stubbornly unsolved problems / De Rújula, A. (Madrid, IFT ; CERN)
Whenever one has witnessed some event and then sees it reported in the media, one's reaction is the same: "it was not quite like that". It is in this spirit of a frequent first-hand witness that I write this article. [...]
arXiv:1910.13891; CERN-TH-2019-188.- 2019-12-03 - 39 p. - Published in : Int. J. Mod. Phys. A 34 (2019) 1930015 Fulltext: PDF;

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2019-11-08
04:03
An exact symmetry in $\lambda$-deformed CFTs / Georgiou, George (Athens U.) ; Sagkrioti, Eftychia (Athens U.) ; Sfetsos, Konstantinos (Athens U.) ; Siampos, Konstantinos (Athens U. ; CERN)
We consider $\lambda$-deformed current algebra CFTs at level $k$, interpolating between an exact CFT in the UV and a PCM in the IR. By employing gravitational techniques, we derive the two-loop, in the large $k$ expansion, $\beta$-function. [...]
arXiv:1911.02027; CERN-TH-2019-053.- 2020-01-15 - 28 p. - Published in : JHEP 2001 (2020) 083 Article from SCOAP3: PDF; Fulltext: PDF;

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