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TH Articles

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2014-11-06
08:31
Approach to equilibrium in weakly coupled nonabelian plasmas / Kurkela, Aleksi (CERN) ; Lu, Egang (McGill U.)
We follow the time evolution of nonabelian gauge bosons from far-from-equilibrium initial conditions to thermal equilibrium by numerically solving an effective kinetic equation that becomes accurate in the weak coupling limit. We consider initial conditions that are either highly overoccupied or underoccupied. [...]
arXiv:1405.6318; CERN-PH-TH-2014-093.- 2014 - 6 p. - Published in : Phys. Rev. Lett. 113 (2014) 182301 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-11-04
07:37
TEK twisted gradient flow running coupling / Pérez, Margarita García (Madrid, Autonoma U. ; Madrid, IFT) ; González-Arroyo, Antonio (Madrid, IFT ; Madrid, Autonoma U.) ; Keegan, Liam (CERN) ; Okawa, Masanori (Hiroshima U. (main))
We measure the running of the twisted gradient flow coupling in the Twisted Eguchi-Kawai (TEK) model, the SU(N) gauge theory on a single site lattice with twisted boundary conditions in the large N limit..
arXiv:1411.0258; CERN-PH-TH-2014-210; IFT-UAM-CSIC-14-114; HUPD-1409; FTUAM-14-47.- 2014 - 7 p. Fulltext: PDF; External link: Preprint

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2014-08-22
10:13
The chiral phase transition in two-flavor QCD from imaginary chemical potential / Bonati, Claudio (Pisa U. ; INFN, Pisa) ; de Forcrand, Philippe (Zurich, ETH ; CERN) ; D'Elia, Massimo (INFN, Pisa ; Pisa U.) ; Philipsen, Owe (Frankfurt U.) ; Sanfilippo, Francesco (Southampton U.)
We investigate the order of the finite temperature chiral symmetry restoration transition for QCD with two massless fermions, by using a novel method, based on simulating imaginary values of the quark chemical potential $\mu=i\mu_i,\mu_i\in\mathbb{R}$. Our method exploits the fact that, for low enough quark mass $m$ and large enough chemical potential $\mu_i$, the chiral transition is decidedly first order, then turning into crossover at a critical mass $m_c(\mu)$. [...]
arXiv:1408.5086; CERN-PH-TH-2014-158; IFUP-TH-2014-8.- 2014 - 8 p. - Published in : Phys. Rev. D 90 (2014) 074030 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-08-19
07:40
Gravity and axions from a random UV QFT / Kiritsis, Elias (CERN ; APC, Paris ; Crete U.)
It is postulated that the UV QFT is enormous and random. The coupling of the Standard Model to such QFT is analyzed. [...]
arXiv:1408.3541; CCTP-2014-14; CERN-PH-TH-2014-153.- 2014 - 39 p. - Published in : EPJ Web Conf. 71 (2014) 00068 Fulltext: PDF; External link: Preprint

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2014-08-06
04:11
Interplay between hydrodynamics and jets / Zapp, Korinna C (CERN) ; Floerchinger, Stefan (CERN)
By combining the jet quenching Monte Carlo JEWEL with a realistic hydrodynamic model for the background we investigate the sensitivity of jet observables to details of the medium model and quantify the influence of the energy and momentum lost by jets on the background evolution. On the level of event averaged source terms the effects are small and are caused mainly by the momentum transfer..
arXiv:1408.0903; CERN-PH-TH-2014-146; MCNET-14-16.- 2014 - Published in : Nucl. Phys. A XX (2014) XX Fulltext: PDF; External link: Preprint
In : 24th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, Germany, 19 - 24 May 2014

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2014-07-31
04:20
String Resonances at Hadron Colliders / Anchordoqui, Luis A (Lehman Coll.) ; Antoniadis, Ignatios (CERN) ; Dai, De-Chang (Shanghai Jiaotong U. ; Shanghai Jiaotong U., INPAC) ; Feng, Wan-Zhe (Munich, Max Planck Inst.) ; Goldberg, Haim (Northeastern U.) ; Huang, Xing (Taiwan, Natl. Normal U.) ; Lust, Dieter (Munich, Max Planck Inst. ; Munich U., ASC) ; Stojkovic, Dejan (SUNY, Buffalo ; Perimeter Inst. Theor. Phys.) ; Taylor, Tomasz R (Northeastern U.)
[Abridged] We consider extensions of the standard model based on open strings ending on D-branes. Assuming that the fundamental string mass scale M_s is in the TeV range and that the theory is weakly coupled, we discuss possible signals of string physics at the upcoming HL-LHC run (3000 fb^{-1}) with \sqrt{s} = 14 TeV, and at potential future pp colliders, HE-LHC and VLHC, operating at \sqrt{s} = 33 and 100 TeV, respectively. [...]
arXiv:1407.8120; MPP--2014--314; LMU-ASC 48-14; CERN-PH-TH-2014-143.- 2014 - 74 p. - Published in : Phys. Rev. D 90 (2014) 066013 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-07-16
05:05
Higgs Mass and Unnatural Supersymmetry / Bagnaschi, Emanuele (Paris, LPTHE) ; Giudice, Gian F (CERN) ; Slavich, Pietro (Paris, LPTHE) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; NICPB, Tallinn)
Assuming that supersymmetry exists well above the weak scale, we derive the full one-loop matching conditions between the SM and the supersymmetric theory, allowing for the possibility of an intermediate Split-SUSY scale. We also compute two-loop QCD corrections to the matching condition of the Higgs quartic coupling. [...]
arXiv:1407.4081; CERN-PH-TH-2014-131; IFUP-TH-2014.- 2014 - 36 p. - Published in : J. High Energy Phys. 09 (2014) 092 Fulltext: PDF; External link: Preprint

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2014-07-04
04:41
T-odd Asymmetry in W+jet Events at the LHC / Frederix, Rikkert (CERN) ; Hagiwara, Kaoru (Sokendai, Tsukuba) ; Yamada, Toshifumi (Taiwan, Natl. Central U.) ; Yokoya, Hiroshi (Toyama U.)
W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under na$\ddot{\i}$ve-T-reversal where both the three-momenta and angular momenta are reversed. Perturbative QCD predicts non-zero polarization at the one-loop level, which can be measured as parity-odd components in the angular distribution of charged leptons from the decay of W bosons. [...]
arXiv:1407.1016; CERN-PH-TH-2014-120; KEK-TH-1750; UT-HET-095.- 2014 - 5 p. - Published in : Phys. Rev. Lett. 113 (2014) 152001 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-06-25
04:12
Holographic Metals and Insulators with Helical Symmetry / Donos, Aristomenis (Cambridge U., DAMTP) ; Goutéraux, Blaise (Nordita ; Royal Inst. Tech., Stockholm ; Stockholm U.) ; Kiritsis, Elias (CERN ; APC, Paris ; IRFU, Saclay ; Diderot U., Paris ; Crete U.)
Homogeneous, zero temperature scaling solutions with Bianchi VII spatial geometry are constructed in Einstein-Maxwell-Dilaton theory. They correspond to quantum critical saddle points with helical symmetry at finite density. [...]
arXiv:1406.6351; CCTP-2014-6; CCQCN-2014-26; CERN-PH-TH-2014-035; NORDITA-2014-76.- 2014 - 28 p. - Published in : J. High Energy Phys. 09 (2014) 038 Fulltext: PDF; External link: Preprint

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2014-06-10
11:11
Extended Mean Field study of complex $\phi^4$-theory at finite density and temperature / Akerlund, Oscar (Zurich, ETH) ; de Forcrand, Philippe (Zurich, ETH ; CERN) ; Georges, Antoine (Ecole Polytechnique, CPHT ; College de France ; U. Geneva (main)) ; Werner, Philipp (Fribourg U.)
We review the Extended Mean Field Theory (EMFT) approximation and apply it to complex, scalar $\phi^4$-theory on the lattice. We study the critical properties of the Bose condensation driven by a nonzero chemical potential $\mu$ at both zero and nonzero temperature and determine the $(T,\mu)$ phase diagram. [...]
arXiv:1405.6613; CERN-PH-TH-2014-091.- 2014 - 10 p. - Published in : Phys. Rev. D 90 (2014) 065008 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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