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TH Articles

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2015-11-05
08:05
A Geometric Formulation of Higgs Effective Field Theory: Measuring the Curvature of Scalar Field Space / Alonso, Rodrigo (UC, San Diego) ; Jenkins, Elizabeth E (UC, San Diego ; CERN) ; Manohar, Aneesh V (UC, San Diego ; CERN)
A geometric formulation of Higgs Effective Field Theory (HEFT) is presented. Experimental observables are given in terms of geometric invariants of the scalar sigma model sector such as the curvature of the scalar field manifold $\mathcal M$. [...]
arXiv:1511.00724; CERN-PH-TH-2015-257.- 2015 - Published in : Phys. Lett. B 754 (2016) 335-342 External link: Preprint

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2015-11-05
08:02
Di-boson Production beyond NLO QCD and Anomalous Couplings / Campanario, F (KIT, Karlsruhe, TP) ; Rauch, M (KIT, Karlsruhe, TP) ; Roth, R (KIT, Karlsruhe, TP) ; Sapeta, S (Cracow, INP ; CERN) ; Zeppenfeld, D (KIT, Karlsruhe, TP)
In these proceedings, we review results for several di-boson production processes beyond NLO QCD at high transverse momenta using the VBFNLO Monte-Carlo program together with the LOOPSIM method. Additionally, we show for the WZ production process how higher order QCD corrections can resemble anomalous coupling effects..
arXiv:1511.00913; CERN-PH-TH-2015-241; FT-UV-15-1103; IFIC-15-86; IFJPAN-IV-2015-16; KA-TH-21-2015.- Geneva : CERN, 2015 - Published in : Acta Phys. Pol. B 46 (2015) 2165-2171 Fulltext: PDF; Jagiellonian U. Open Access article: PDF; External link: Preprint
In : 39th International Conference of Theoretical Physics: Matter to the Deepest, Recent Developments in Physics of Fundamental Interactions, Ustron, Poland, 13 - 18 Sep 2015, pp.2165-2171

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2015-11-03
07:40
Hypermagnetic gyrotropy, inflation and the baryon asymmetry of the Universe / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
We investigate the production of the hypermagnetic gyrotropy when the electric and magnetic gauge couplings evolve at different rates, as it happens in the the relativistic theory of the Van der Waals forces. If a pseudo-scalar interaction breaks the duality symmetry of the corresponding equations, the gyrotropic configurations of the hypermagnetic fields can be amplified from the vacuum during an inflationary stage of expansion. [...]
arXiv:1511.00138; CERN-PH-TH-2015-195.- 2015 - 8 p. - Published in : Phys. Rev. D 92 (2015) 121301 Fulltext: PDF; External link: Preprint

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2015-10-15
08:14
PDF4LHC recommendations for LHC Run II / Butterworth, Jon (University Coll. London) ; Carrazza, Stefano (INFN, Milan ; Milan U.) ; Cooper-Sarkar, Amanda (Oxford U.) ; De Roeck, Albert (CERN ; U. Antwerp (main)) ; Feltesse, Joel (Saclay) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Gao, Jun (Argonne) ; Glazov, Sasha (DESY) ; Huston, Joey (Michigan State U.) ; Kassabov, Zahari (INFN, Milan ; Milan U. ; Turin U. ; INFN, Turin) et al.
We provide an updated recommendation for the usage of sets of parton distribution functions (PDFs) and the assessment of PDF and PDF+$\alpha_s$ uncertainties suitable for applications at the LHC Run II. We review developments since the previous PDF4LHC recommendation, and discuss and compare the new generation of PDFs, which include substantial information from experimental data from the Run I of the LHC. [...]
arXiv:1510.03865; OUTP-15-17P; SMU-HEP-15-12; TIF-UNIMI-2015-14; LCTS-2015-27; CERN-PH-TH-2015-249.- 2016 - 65 p. - Published in : J. Phys. G 43 (2016) 023001 External link: Preprint

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2015-10-10
08:04
Infrared divergences and harmonic anomalies in the two-loop superstring effective action / Pioline, Boris (CERN ; UPMC, Paris (main) ; Paris, LPTHE) ; Russo, Rodolfo (Queen Mary, U. of London)
We analyze the pertubative contributions to the $D^4 R^4$ and $D^6 R^4$ couplings in the low-energy effective action of type II string theory compactified on a torus $T^d$, with particular emphasis on two-loop corrections. In general, it is necessary to introduce an infrared cut-off $\Lambda$ to separate local interactions from non-local effects due to the exchange of massless states [...]
arXiv:1510.02409; CERN-PH-TH-2015-240; QMUL-PH-15-17.- 2015 - 23 p. - Published in : J. High Energy Phys. 12 (2015) 102 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-09-28
07:32
A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories / Cacciari, Matteo (Diderot U., Paris ; UPMC, Paris (main) ; Paris, LPTHE ; CERN) ; Del Debbio, Luigi (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Espinosa, José R (ICREA, Barcelona ; Barcelona, IFAE) ; Polosa, Antonio D (Rome U. ; INFN, Rome) ; Testa, Massimo (Rome U. ; INFN, Rome)
Using elementary considerations of Lorentz invariance, Bose symmetry and BRST invariance, we argue why the decay of a massive color-octet vector state into a pair of on-shell massless gluons is possible in a non-Abelian SU(N) Yang-Mills theory, we constrain the form of the amplitude of the process and offer a simple understanding of these results in terms of effective-action operators..
arXiv:1509.07853; CERN-PH-TH-2015-173.- 2016 - 7 p. - Published in : Phys. Lett. B 753 (2016) 476-481 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-09-24
08:04
Topological Susceptibility from Slabs / Bietenholz, Wolfgang (Mexico U., ICN) ; de Forcrand, Philippe (Zurich, ETH ; CERN) ; Gerber, Urs (Mexico U., ICN ; IFM-UMSNH, Michoacan)
In quantum field theories with topological sectors, a non-perturbative quantity of interest is the topological susceptibility chi_t. In principle it seems straightforward to measure chi_t by means of Monte Carlo simulations. [...]
arXiv:1509.06433; CERN-PH-TH-2015-219.- 2015 - 23 p. - Published in : J. High Energy Phys. 12 (2015) 070 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-09-24
08:03
QCD corrections to ZZ production in gluon fusion at the LHC / Caola, Fabrizio (CERN) ; Melnikov, Kirill (KIT, Karlsruhe, TTP) ; Röntsch, Raoul (Fermilab) ; Tancredi, Lorenzo (KIT, Karlsruhe, TTP)
We compute the next-to-leading order QCD corrections to the production of two Z-bosons in the annihilation of two gluons at the LHC. Being enhanced by a large gluon flux, these corrections provide distinct and, potentially, the dominant part of the N$^3$LO QCD contributions to Z-pair production in proton collisions. [...]
arXiv:1509.06734; TTP15-035; CERN-PH-TH-2015-226; FERMILAB-PUB-15-398-T.- 2015 - 18 p. - Published in : Phys. Rev. D 92 (2015) 094028 Fulltext: PDF; External link: Preprint

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2015-09-22
07:52
Minimal scalar-less matter-coupled supergravity / Dall'Agata, Gianguido (Padua U., Astron. Dept. ; Padua U. ; INFN, Padua ; Ecole Polytechnique, CPHT) ; Ferrara, Sergio (CERN ; Frascati ; UCLA) ; Zwirner, Fabio (Padua U., Astron. Dept. ; Padua U. ; INFN, Padua ; CERN)
We build the minimal supergravity model where the nilpotent chiral goldstino superfield is coupled to a chiral matter superfield, realising a different non-linear representation through a mixed nilpotency constraint. The model describes the spontaneous breaking of local supersymmetry in the presence of a generically massive Majorana fermion, but in the absence of elementary scalars. [...]
arXiv:1509.06345; CERN-PH-TH-2015-222; CPHT-RR037.0915; DFPD-2015-TH-21.- 2016 - 8 p. - Published in : Phys. Lett. B 752 (2016) 263-266 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-09-21
07:26
General squark flavour mixing: constraints, phenomenology and benchmarks / De Causmaecker, Karen (Brussels U., IIHE ; Intl. Solvay Inst., Brussels) ; Fuks, Benjamin (UPMC, Paris (main) ; Paris, LPTHE ; Strasbourg, IPHC ; Strasbourg, IReS) ; Herrmann, Bjoern (Annecy, Lapth) ; Mahmoudi, Farvah (Ecole Normale Supérieure, Paris ; Lyon Observ. ; Lyon U. ; CERN) ; O'Leary, Ben (Wurzburg U.) ; Porod, Werner (Wurzburg U.) ; Sekmen, Sezen (Kyungpook Natl. U.) ; Strobbe, Nadja (Gent U. ; Fermilab)
We present an extensive study of non-minimal flavour violation in the squark sector in the framework of the Minimal Supersymmetric Standard Model. We investigate the effects of multiple non-vanishing flavour-violating elements in the squark mass matrices by means of a Markov Chain Monte Carlo scanning technique and identify parameter combinations that are favoured by both current data and theoretical constraints. [...]
arXiv:1509.05414; CERN-PH-TH-2015-208; LAPTH-034-15.- 2015 - 31 p. - Published in : J. High Energy Phys. 11 (2015) 125 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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