CERN Accelerating science

TH Articles

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2016-08-10
09:19
On gravitational and thermal corrections to vacuum decay / Salvio, Alberto (CERN) ; Strumia, Alessandro (INFN, Pisa ; CERN ; Pisa U.) ; Tetradis, Nikolaos (CERN ; Athens U.) ; Urbano, Alfredo (CERN)
We reconsider gravitational corrections to vacuum decay, confirming and simplifying earlier results and extending them allowing for a non-minimal coupling of the Higgs to gravity, finding that leading-order gravitational corrections suppress the vacuum decay rate. Furthermore, we find minor corrections to thermal vacuum decay in the SM adding one-loop corrections to the Higgs kinetic term, two-loop corrections to the Higgs potential and allowing for time-dependent bounces..
arXiv:1608.02555; IFUP-TH-2016; CERN-TH-2016-180.- 2016 - 18 p. - Published in : J. High Energy Phys. 09 (2016) 054 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-06-29
07:45
On the validity of the CMSSM interpretation of the diphoton excess / Dreiner, Herbi K (U. Bonn, Phys. Inst., BCTP ; Bonn U.) ; Krauss, Manuel E (U. Bonn, Phys. Inst., BCTP ; Bonn U.) ; O'Leary, Ben ; Opferkuch, Toby (U. Bonn, Phys. Inst., BCTP ; Bonn U.) ; Staub, Florian (CERN)
It has been proposed that the observed diphoton excess at 750 GeV could be explained within the constrained MSSM via resonantly produced stop bound states. We reanalyse this scenario critically and extend previous work to include the constraints from the stability of the electroweak vacuum and from the decays of the stoponium into a pair of Higgs bosons. [...]
arXiv:1606.08811; CERN-TH-2016-145; BONN-TH-2016-05.- 2016 - 7 p. - Published in : Phys. Rev. D 94 (2016) 055013 Fulltext: PDF; External link: Preprint

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2016-06-16
08:31
The Higgs transverse momentum spectrum with finite quark masses beyond leading order / Caola, Fabrizio (CERN) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Marzani, Simone (SUNY, Buffalo) ; Muselli, Claudio (Milan U. ; INFN, Milan) ; Vita, Gherardo (MIT, Cambridge, CTP)
We apply the leading-log high-energy resummation technique recently derived by some of us to the transverse momentum (pt) distribution for production of a Higgs boson in gluon fusion. We use our results to obtain information on mass-dependent corrections to this observable, which is only known at leading order when exact mass dependence is included. [...]
arXiv:1606.04100; CERN-TH-2016-139; TIF-UNIMI-2016-4; MIT-CTP-4799.- 2016 - 32 p. - Published in : J. High Energy Phys. 08 (2016) 150 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-06-08
08:02
Higgs Inflation, Reheating and Gravitino Production in No-Scale Supersymmetric GUTs / Ellis, John (King's Coll. London ; CERN) ; He, Hong-Jian (Tsinghua U., Beijing, CHEP ; Peking U., CHEP) ; Xianyu, Zhong-Zhi (Harvard U. (main))
We extend our previous study of supersymmetric Higgs inflation in the context of no-scale supergravity and grand unification, to include models based on the flipped SU(5) and the Pati-Salam group. Like the previous SU(5) GUT model, these yield a class of inflation models whose inflation predictions interpolate between those of the quadratic chaotic inflation and Starobinsky-like inflation, while also avoiding tension with proton decay limits. [...]
arXiv:1606.02202; KCL-PH-TH-2016-33; CERN-TH-2016-134.- 2016 - 21 p. - Published in : J. Cosmol. Astropart. Phys. 08 (2016) 068 Fulltext: PDF; External link: Preprint

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2016-05-30
07:28
The Higgs of the Higgs and the diphoton channel / Kannike, Kristjan (NICPB, Tallinn) ; Pelaggi, Giulio Maria (Pisa U. and INFN, Pisa) ; Salvio, Alberto (CERN) ; Strumia, Alessandro (NICPB, Tallinn ; Pisa U. and INFN, Pisa ; CERN)
LHC results do not confirm conventional natural solutions to the Higgs mass hierarchy problem, motivating alternative interpretations where a hierarchically small weak scale is generated from a dimension-less quantum dynamics. We propose weakly and strongly-coupled models where the field that breaks classical scale invariance giving mass to itself and to the Higgs is identified with a possible new resonance within the LHC reach. [...]
arXiv:1605.08681; IFUP-TH-2016; CERN-TH-2016-128.- 2016 - 21 p. - Published in : J. High Energy Phys. 07 (2016) 101 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-05-27
08:32
Reweighting Parton Showers / Bellm, Johannes (Durham U., IPPP ; Durham U.) ; Plätzer, Simon (Durham U., IPPP ; Durham U. ; Manchester U.) ; Richardson, Peter (Durham U., IPPP ; Durham U. ; CERN) ; Siódmok, Andrzej (CERN ; Cracow, INP) ; Webster, Stephen (Durham U., IPPP ; Durham U. ; CERN)
We report on the possibility of reweighting parton-shower Monte Carlo predictions for scale variations in the parton-shower algorithm. The method is based on a generalization of the Sudakov veto algorithm. [...]
arXiv:1605.08256; MAN-HEP-2016-09; CERN-TH-2016-124; IFJPAN-IV-2016-12; HERWIG-2016-05; MCNET-16-16; IPPP-16-48.- 2016 - 8 p. - Published in : Phys. Rev. D 94 (2016) 034028 Fulltext: PDF; External link: Preprint

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2016-05-19
08:30
Soft Gamma Rays from Heavy WIMPs / Krauss, Manuel Ernst (Bonn U.) ; Opferkuch, Toby (Bonn U.) ; Staub, Florian (CERN) ; Winkler, Martin Wolfgang (Bonn U.)
We propose an explanation of the galactic center gamma ray excess by supersymmetric WIMPs as heavy as 500 GeV. The lightest neutralino annihilates into vector-like leptons or quarks which cascade decay through intermediate Higgs bosons. [...]
arXiv:1605.05327; CERN-TH-2016-118; BONN-TH-2016-04.- 2016 - 8 p. - Published in : Phys. Dark Universe 14 (2016) 29-34 Fulltext: PDF; External link: Preprint

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2016-05-19
08:27
Thermodynamics of perfect fluids from scalar field theory / Ballesteros, Guillermo (IPhT, Saclay ; CERN) ; Comelli, Denis (INFN, Ferrara) ; Pilo, Luigi (Gran Sasso ; L'Aquila U.)
The low-energy dynamics of relativistic continuous media is given by a shift-symmetric effective theory of four scalar fields. These scalars describe the embedding in spacetime of the medium and play the role of Stuckelberg fields for spontaneously broken spatial and time translations. [...]
arXiv:1605.05304; CERN-TH-2016-098.- 2016 - 24 p. - Published in : Phys. Rev. D 94 (2016) 025034 Fulltext: PDF; External link: Preprint

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2016-05-12
07:42
First complete study of hadroproduction of a $\Upsilon$ meson associated with a prompt $J/\psi$ / Shao, Hua-Sheng (CERN) ; Zhang, Yu-Jie (Tsinghua U., Beijing, KLPRI ; Beihang U. ; CAS, Beijing)
We present the first complete study of $\Upsilon$ and prompt $J/\psi$ production from single-parton scattering, including the complete $\mathcal{O}(\alpha_S^6)$ color-singlet contribution, the $\mathcal{O}(\alpha_S^2\alpha^2)$ electroweak contribution, the complete non-relativistic S-wave and P-wave color-octet contribution as well as the feeddown contribution. Our study motivated by the recent evidence reported by D0 collaboration of prompt $J/\psi$ and $\Upsilon$ simultaneous production at the Tevatron. [...]
arXiv:1605.03061; CERN-TH-2016-096.- Geneva Geneva : CERN, CERN, 2016 - 11 p. - Published in : Phys. Rev. Lett. 17 (2016) 062001 Fulltext: PDF; External link: Preprint

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2016-05-10
08:17
Time-Sliced Perturbation Theory II: Baryon Acoustic Oscillations and Infrared Resummation / Blas, Diego (CERN) ; Garny, Mathias (CERN) ; Ivanov, Mikhail M (EPFL, Lausanne, LPPC ; Moscow State U. ; Moscow, INR) ; Sibiryakov, Sergey (CERN ; EPFL, Lausanne, LPPC ; Moscow, INR)
We use time-sliced perturbation theory (TSPT) to give an accurate description of the infrared non-linear effects affecting the baryonic acoustic oscillations (BAO) present in the distribution of matter at very large scales. In TSPT this can be done via a systematic resummation that has a simple diagrammatic representation and does not involve uncontrollable approximations. [...]
arXiv:1605.02149; CERN-TH-2016-059; INR-TH-2016-009.- Geneva Geneva : CERN, CERN, 2016 - 37 p. - Published in : J. Cosmol. Astropart. Phys. 07 (2016) 028 Fulltext: PDF; External link: Preprint

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