CERN Accelerating science

TH Articles

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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 Preprint: PDF; Published version from PoS: PDF;
In : 34th International Symposium on Lattice Field Theory, Southampton, UK, 24 - 30 Jul 2016, pp.020

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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.- 2017-01-11 - 21 p. - Published in : PoS: LATTICE2016 (2016) , pp. 197 Fulltext: PDF;

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2017-01-20
07:22
Non-gaussianity of the critical 3d Ising model / Rychkov, Slava (CERN ; Ecole Normale Superieure) ; Simmons-Duffin, David (Princeton, Inst. Advanced Study ; Caltech) ; Zan, Bernardo (ITPP, Lausanne ; CERN)
We discuss the 4pt function of the critical 3d Ising model, extracted from recent conformal bootstrap results. We focus on the non-gaussianity Q - the ratio of the 4pt function to its gaussian part given by three Wick contractions. [...]
CERN-TH-2016-249; arXiv:1612.02436.- 2017 - 10 p. - Published in : SciPost Phys. 2 (2017) 001 Fulltext: pdf - PDF; arXiv:1612.02436 - PDF; SciPost Foundation Open Access article: PDF;

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2016-12-02
12:49
SUSY Meets Her Twin / Katz, Andrey (CERN ; Geneva U., CAP) ; Mariotti, Alberto (Brussels U., IIHE) ; Pokorski, Stefan (Warsaw U.) ; Redigolo, Diego (Tel Aviv U. ; Weizmann Inst.) ; Ziegler, Robert (Karlsruhe U., TTP)
We investigate the general structure of mirror symmetry breaking in the Twin Higgs scenario. We show, using the IR effective theory, that a significant gain in fine tuning can be achieved if the symmetry is broken hardly. [...]
CERN-TH-2016-240; TTP16-054; arXiv:1611.08615.- 2017 - 37 p. - Published in : J. High Energy Phys. 01 (2017) 142 Fulltext: PDF;

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2016-12-02
12:44
Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC / Lansberg, Jean-Philippe (Orsay, IPN) ; Shao, Hua-Sheng (CERN)
The ATLAS collaboration recently reported on the first observation of associated-production of a $Z^0$ boson with a $J/\psi$. We recently claimed that the corresponding yield of the {\it prompt} $J/\psi$ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of $\sigma_{\rm eff}$. [...]
CERN-TH-2016-244; arXiv:1611.09303.- 2017 - 12 p. - Published in : Nucl. Phys. B 916 (2017) 132-142 Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-11-01
07:47
Massless Interacting Scalar Fields in de Sitter space / Nacir, Diana López (CERN) ; Mazzitelli, Francisco D (Balseiro Inst., San Carlos de Bariloche) ; Trombetta, Leonardo G (Balseiro Inst., San Carlos de Bariloche)
We present a method to compute the two-point functions for an $O(N)$ scalar field model in de Sitter spacetime, avoiding the well known infrared problems for massless fields. The method is based on an exact treatment of the Euclidean zero modes and a perturbative one of the nonzero modes, and involves a partial resummation of the leading secular terms. [...]
arXiv:1610.09943; CERN-TH-2016-151.- 2016 - 8 p. - Published in : EPJ Web Conf. 125 (2016) 05019 Preprint: PDF; External link: Preprint

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2016-11-01
07:46
Likelihood Analysis of Supersymmetric SU(5) GUTs / Bagnaschi, E. (DESY) ; Costa, J.C. (Imperial Coll., London) ; Sakurai, K. (Durham U., IPPP ; Warsaw U.) ; Borsato, M. (Santiago de Compostela U.) ; Buchmueller, O. (Imperial Coll., London) ; Cavanaugh, R. (Fermilab ; Illinois U., Chicago) ; Chobanova, V. (Santiago de Compostela U.) ; Citron, M. (Imperial Coll., London) ; De Roeck, A. (CERN ; Antwerp U.) ; Dolan, M.J. (Melbourne U.) et al.
We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has 7 parameters: a universal gaugino mass $m_{1/2}$, distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), $m_5$ and $m_{10}$, and for the $\mathbf{5}$ and $\mathbf{\bar 5}$ Higgs representations $m_{H_u}$ and $m_{H_d}$, a universal trilinear soft SUSY-breaking parameter $A_0$, and the ratio of Higgs vevs $\tan \beta$. [...]
KCL-PH-TH-2016-57; CERN-TH-2016-217; DESY-16-156; IIFT-UAM-CSIC-16-105; FTPI-MINN-16-29; UMN-TH-3609-16; IPPP-16-97; FERMILAB-PUB-16-453-CMS; arXiv:1610.10084; CERN-PH-TH-2016-217; --IFT-UAM-CSIC-16-105; --FERMILAB-PUB-16-453-CMS.- Geneva : CERN, 2017 - 37 p. - Published in : Eur. Phys. J. C 77 (2017) 104 Fulltext: fermilab-pub-16-453-cms - PDF; arXiv:1610.10084 - PDF; Springer Open Access article: PDF; External link: FERMILABPUB

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2016-10-28
07:41
D = 3 Unification of Curious Supergravities / Duff, M.J. (Imperial Coll., London ; Oxford U., Inst. Math.) ; Ferrara, S. (CERN ; INFN, Italy ; UCLA) ; Marrani, A. (Enrico Fermi Ctr., Rome ; INFN, Padua ; CERN ; Padua U.)
We consider the dimensional reduction to D = 3 of four maximal-rank supergravities which preserve minimal supersymmetry in D = 11, 7, 5 and 4. Such "curious" theories were investigated some time ago, and the four-dimensional one corresponds to an N = 1 supergravity with 7 chiral multiplets spanning the seven-disk manifold. [...]
arXiv:1610.08800; IMPERIAL-TP-2016-MJD-3; CERN-TH-2016-225; DFPD-2016-TH-18.- 2017 - 1+7 p. - Published in : J. High Energy Phys. 01 (2017) 023 Fulltext: PDF;

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2016-10-26
08:39
A Clockwork Theory / Giudice, Gian F. (CERN) ; McCullough, Matthew (CERN)
The clockwork is a mechanism for generating light particles with exponentially suppressed interactions in theories which contain no small parameters at the fundamental level. We develop a general description of the clockwork mechanism valid for scalars, fermions, gauge bosons, and gravitons. [...]
CERN-TH-2016-223; arXiv:1610.07962; CERN-TH-2016-223.- 2017 - 26 p. - Published in : J. High Energy Phys. 1702 (2017) 036 Fulltext: PDF; Springer Open Access article: PDF;

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2016-10-24
07:21
Exact $\nabla^4 R^4$ couplings and helicity supertraces / Bossard, Guillaume (Ecole Polytechnique, CPHT) ; Pioline, Boris (CERN ; Paris, LPTHE)
In type II string theory compactified on a $d$-dimensional torus $T^d$ down to $D=10-d$ dimensions, the $R^4$ and $\nabla^4 R^4$ four-graviton couplings are known exactly, for all values of the moduli, in terms of certain Eisenstein series of the U-duality group $E_{d}(\mathbb{Z})$. In the limit where one circle in the torus becomes large, these couplings are expected to reduce to their counterpart in dimension $D+1$, plus threshold effects and exponentially suppressed corrections corresponding to BPS black holes in dimension $D+1$ whose worldline winds around the circle. [...]
arXiv:1610.06693; CERN-TH-2016-224; CPHT-RR046.102016.- 2017 - 40 p. - Published in : J. High Energy Phys. 01 (2017) 050 Fulltext: PDF;

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