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TH Articles

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2017-04-13
08:29
Single top polarisation as a window to new physics / Aguilar-Saavedra, J.A. (Granada U., Theor. Phys. Astrophys.) ; Degrande, C. (CERN) ; Khatibi, S. (IPM, Tehran)
We discuss the effect of heavy new physics, parameterised in terms of four-fermion operators, in the polarisation of single top (anti-)quarks in the $t$-channel process at the LHC. It is found that for operators involving a right-handed top quark field the relative effect on the longitudinal polarisation is twice larger than the relative effect on the total cross section. [...]
CERN-TH-2017-013; arXiv:1701.05900.- 2017 - 9 p. - Published in : 10.1016/j.physletb.2017.04.023 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF;

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2017-03-14
16:44
Thermodynamics of strongly-coupled lattice QCD in the chiral limit / de Forcrand, Philippe (Zurich, ETH ; CERN) ; Romatschke, Paul (Colorado U.) ; Unger, Wolfgang (Bielefeld U.) ; Vairinhos, Helvio (Zurich, ETH)
In the strong coupling limit, $n$-point functions in lattice QCD with staggered fermions can be rewritten exactly as sums over constrained configurations of monomers, dimers, and baryon loops covering the spacetime lattice. Worm algorithms provide efficient global sampling methods over such ensembles, and are particularly efficient in the chiral limit. [...]
arXiv:1701.08324; CERN-TH-2017-012.- 2017 - 7 p. - Published in : PoS: LATTICE2016 (2017) , pp. 086 Fulltext: PDF; Published version from PoS: PDF;
In : 34th International Symposium on Lattice Field Theory, Southampton, UK, 24 - 30 Jul 2016, pp.086

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2017-02-16
07:58
QED Corrections to Hadronic Observables / Patella, Agostino (CERN ; Plymouth U., Math. Stat. Dept.)
When aiming at the percent precision in hadronic quantities calculated by means of lattice simulations, isospin breaking effects become relevant. These are of two kinds: up/down mass splitting and electromagnetic corrections. [...]
CERN-TH-2017-019; arXiv:1702.03857.- 2017-02-13 - 31 p. - Published in : PoS: LATTICE2016, pp. 020 Fulltext: arXiv:1702.03857 - PDF; PoS(LATTICE2016)020 - PDF; LATTICE2016_020 - PDF;
In : 34th International Symposium on Lattice Field Theory, Southampton, UK, 24 - 30 Jul 2016, pp.020

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2017-02-10
07:37
Aspects of Berry phase in QFT / Baggio, Marco (Leuven U.) ; Niarchos, Vasilis (Durham U., Dept. of Math. ; Durham U., CPT) ; Papadodimas, Kyriakos (CERN ; U. Groningen, VSI)
When continuous parameters in a QFT are varied adiabatically, quantum states typically undergo mixing---a phenomenon characterized by the Berry phase. We initiate a systematic analysis of the Berry phase in QFT using standard quantum mechanics methods. [...]
CERN-TH-2016-241; DCPT-16-55; arXiv:1701.05587.- 2017 - 50 p. - Published in : J. High Energy Phys. 04 (2017) 062 Fulltext: PDF; Springer Open Access article: PDF;

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2017-02-09
08:13
Nested soft-collinear subtractions in NNLO QCD computations / Caola, Fabrizio (CERN ; Durham U., IPPP) ; Melnikov, Kirill (Karlsruhe U.) ; Röntsch, Raoul (Karlsruhe U.)
We discuss a modification of the next-to-next-to-leading order (NNLO) subtraction scheme based on the residue-improved sector decomposition that reduces the number of double-real emission sectors from five to four. In particular, a sector where energies and angles of unresolved particles vanish in a correlated fashion is redundant and can be discarded. [...]
CERN-TH-2017-029; IPPP-17-10; TTP17-003; arXiv:1702.01352.- 2017 - 64 p. - Published in : Eur. Phys. J. C 77 (2017) 248 Fulltext: PDF; Springer Open Access article: PDF;

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2017-02-09
08:12
No-Scale SU(5) Super-GUTs / Ellis, John (King's Coll. London ; CERN) ; Evans, Jason L. (Korea Inst. Advanced Study, Seoul) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U.)
We reconsider the minimal SU(5) Grand Unified Theory (GUT) in the context of no-scale supergravity, assuming that the soft supersymmetry-breaking parameters satisfy universality conditions at some input scale M_in above the GUT scale M_GUT. When setting up such a no-scale super-GUT model, special attention must be paid to avoiding the Scylla of rapid proton decay and the Charybdis of an excessive density of cold dark matter, while also having an acceptable mass for the Higgs boson. [...]
KCL-PH-TH-2017-05; CERN-TH-2017-010; KIAS-P17008; UT-17-03; ACT-01-17; MI-TH-1738; UMN-TH-3618-17; FTPI-MINN-17-02; arXiv:1702.00379.- 2017 - 24 p. - Published in : Eur. Phys. J. C 77 (2017) 232 Fulltext: PDF; Springer Open Access article: PDF;

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2017-02-04
07:25
Ring Relations and Mirror Map from Branes / Assel, Benjamin (CERN)
We study the space of vacua of three-dimensional $\mathcal{N}=4$ theories from a novel approach building on the type IIB brane realization of the theory and in which the insertion of local chiral operators in the path integral is obtained from integrating out light modes in appropriate brane setups. Most of our analysis focuses on abelian quiver theories which can be realized as the low-energy theory of D3-D5-NS5 brane arrays. [...]
CERN-TH-2017-018; arXiv:1701.08766.- 2017 - 66+9 p. - Published in : J. High Energy Phys. 03 (2017) 152 Fulltext: PDF; Springer Open Access article: PDF;

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2017-01-20
07:22
Supersymmetric partition functions and the three-dimensional A-twist / Closset, Cyril (CERN) ; Kim, Heeyeon (Perimeter Inst. Theor. Phys.) ; Willett, Brian (Santa Barbara, KITP)
We study three-dimensional $\mathcal{N}=2$ supersymmetric gauge theories on $\mathcal{M}_{g,p}$, an oriented circle bundle of degree $p$ over a closed Riemann surface, $\Sigma_g$. We compute the $\mathcal{M}_{g,p}$ supersymmetric partition function and correlation functions of supersymmetric loop operators. [...]
CERN-TH-2017-006; arXiv:1701.03171.- 2017 - 84 p. - Published in : J. High Energy Phys. 03 (2017) 74 Fulltext: PDF; Springer Open Access article: PDF;

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2017-01-20
07:22
The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration / Bruno, M. (Brookhaven) ; Dalla Brida, M. (INFN, Milan Bicocca ; NIC, Zeuthen ; Milan Bicocca U. ; DESY, Zeuthen) ; Fritzsch, P. (CERN ; Madrid, IFT) ; Korzec, T. (Bergische U., Wuppertal (main)) ; Ramos, A. (CERN) ; Schaefer, S. (NIC, Zeuthen ; DESY, Zeuthen) ; Simma, H. (NIC, Zeuthen ; DESY, Zeuthen) ; Sint, S. (Trinity Coll., Dublin) ; Sommer, R. (NIC, Zeuthen ; Humboldt U., Berlin ; DESY, Zeuthen)
We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. [...]
CERN-TH-2016-262; DESY-17-007; arXiv:1701.03075.- 2016 - 21 p. - Published in : PoS: LATTICE2016 (2016) , pp. 197 Fulltext: arXiv:1701.03075 - PDF; PoS(LATTICE2016)197 - PDF;

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2017-01-20
07:22
FRB 121102 Casts New Light on the Photon Mass / Bonetti, Luca (Orleans U. ; LPC2E, Orleans) ; Ellis, John (King's Coll. London ; CERN) ; Mavromatos, Nikolaos E. (King's Coll. London ; CERN) ; Sakharov, Alexander S. (New York U. ; Manhattan Coll., Riverdale ; CERN) ; Sarkisyan-Grinbaum, Edward K. (CERN ; Texas U., Arlington) ; Spallicci, Alessandro D. A. M. (Orleans U. ; LPC2E, Orleans)
The photon mass, $m_\gamma$, can in principle be constrained using measurements of the dispersion measures (DMs) of fast radio bursts (FRBs), once the FRB redshifts are known. The DM of the repeating FRB 121102 is known to $< 1$\%, a host galaxy has now been identified with high confidence,and its redshift, $z$, has now been determined with high accuracy: $z = 0.19273(8)$. [...]
KCL-PH-TH-2017-01; CERN-TH-2017-007; arXiv:1701.03097.- 2017 - 8 p. - Published in : Phys. Lett. B 768 (2017) 326-329 Elsevier Open Access article: PDF; Fulltext: PDF;

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