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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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2014-10-17
07:43
Global fits to b -> s ll data and signs for lepton non-universality / Hurth, T (U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Mahmoudi, F (CERN ; IUF, Paris ; Lyon U. ; Lyon Observ. ; Lyon, Ecole Normale Superieure) ; Neshatpour, S (IPM, Tehran)
There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. [...]
arXiv:1410.4545; CERN-PH-TH-2014-198; MITP-14-078.- 2014 - 15 p. - Published in : J. High Energy Phys. 12 (2014) 053 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:59
Lattice gauge theory without link variables / Vairinhos, Helvio (Zurich, ETH ; Porto U.) ; de Forcrand, Philippe (Zurich, ETH ; CERN)
We obtain a sequence of alternative representations for the partition function of pure SU(N) or U(N) lattice gauge theory with the Wilson plaquette action, using the method of Hubbard-Stratonovich transformations. In particular, we are able to integrate out all the link variables exactly, and recast the partition function of lattice gauge theory as a Gaussian integral over auxiliary fields..
arXiv:1409.8442; CERN-PH-TH-2014-186.- 2014 - 5 p. - Published in : J. High Energy Phys. 12 (2014) 038 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:56
Natural Braneworld Inflation in Light of Recent Results from Planck and BICEP2 / Neupane, Ishwaree P (CERN ; Canterbury U. ; Tribhuvan U., Kathmandu)
In this paper we report on a major theoretical observation in cosmology. We present a concrete cosmological model for which inflation has natural beginning and natural ending. [...]
arXiv:1409.8647; CERN-PH-TH-2014-189.- 2014 - 22 p. - Published in : Phys. Rev. D 90 (2014) 123502 Fulltext: PDF; External link: Preprint

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2014-09-17
07:54
Exact correlation functions in SU(2) N=2 superconformal QCD / Baggio, Marco (Zurich, ETH) ; Niarchos, Vasilis (Crete U.) ; Papadodimas, Kyriakos (CERN ; U. Groningen (main))
We report an exact solution of 2- and 3-point functions of chiral primary fields in SU(2) N=2 super-Yang-Mills theory coupled to four hypermultiplets. It is shown that these correlation functions are non-trivial functions of the gauge coupling, obeying differential equations which take the form of the semi-infinite Toda chain. [...]
arXiv:1409.4217; CCTP-2014-18; CCQCN-2014-42; CERN-PH-TH-2014-177.- 2014 - 5 p. - Published in : Phys. Rev. Lett. 113 (2014) 251601 Fulltext: PDF; External link: Preprint

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2014-08-29
07:38
Catching sparks from well-forged neutralinos / Bramante, Joseph (Notre Dame U.) ; Delgado, Antonio (Notre Dame U. ; CERN) ; Elahi, Fatemeh (Notre Dame U.) ; Martin, Adam (Notre Dame U.) ; Ostdiek, Bryan (Notre Dame U.)
In this paper we present a new search technique for electroweakinos, the superpartners of electroweak gauge and Higgs bosons, based on final states with missing transverse energy, a photon, and a dilepton pair, $\ell^+\,\ell^- + \gamma + \displaystyle{\not} E_T$. Unlike traditional electroweakino searches, which perform best when $m_{\widetilde{\chi}^0_{2,3}} - m_{\widetilde{\chi}^0_1}, m_{\widetilde{\chi}^{\pm}} - m_{\widetilde{\chi}^0_1} > m_Z$, our search favors nearly degenerate spectra; degenerate electroweakinos typically have a larger branching ratio to photons, and the cut $m_{\ell\ell} \ll m_Z$ effectively removes on-shell Z boson backgrounds while retaining the signal. [...]
arXiv:1408.6530; CERN-PH-TH-2014-164.- 2014 - 29 p. - Published in : Phys. Rev. D 90 (2014) 095008 Fulltext: PDF; External link: Preprint

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2014-08-29
07:36
SIMPle Dark Matter: Self-Interactions and keV Lines / Boddy, Kimberly K (Caltech) ; Feng, Jonathan L (CERN ; UC, Irvine) ; Kaplinghat, Manoj (UC, Irvine) ; Shadmi, Yael (Israel Institute of Technology) ; Tait, Timothy M P (UC, Irvine)
We consider a simple supersymmetric hidden sector: pure SU(N) gauge theory. Dark matter is made up of hidden glueballinos with mass $m_X$ and hidden glueballs with mass near the confinement scale $\Lambda$. [...]
arXiv:1408.6532; UCI-TR-2014-06; CERN-PH-TH-2014-162; CALT-TH-2014-148.- 2014 - 6 p. - Published in : Phys. Rev. D 90 (2014) 095016 Fulltext: PDF; External link: Preprint

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2014-08-26
07:52
W gamma production in hadronic collisions using the POWHEG+MiNLO method / Barze, Luca (CERN) ; Chiesa, Mauro (INFN, Pavia ; Pavia U.) ; Montagna, Guido (Pavia U. ; INFN, Pavia) ; Nason, Paolo (INFN, Milan Bicocca) ; Nicrosini, Oreste (INFN, Pavia) ; Piccinini, Fulvio (INFN, Pavia) ; Prosperi, Valeria (INFN, Pavia ; Pavia U.)
We detail a calculation of W gamma production in hadronic collision, at Next-to-Leading Order (NLO) QCD interfaced to a shower generator according to the POWHEG prescription supplemented with the MiNLO procedure. The fixed order result is matched to an interleaved QCD+QED parton shower, in such a way that the contribution arising from hadron fragmentation into photons is fully modeled. [...]
arXiv:1408.5766; CERN-PH-TH-2014-130; LPN14-095.- 2014 - 38 p. - Published in : J. High Energy Phys. 12 (2014) 039 Fulltext: PDF; Springer Open Access article: 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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