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2013-03-01
13:29
Flavoured Naturalness / Blanke, Monika (CERN) ; Giudice, Gian F (CERN) ; Paradisi, Paride (CERN) ; Perez, Gilad (CERN ; Weizmann Inst.) ; Zupan, Jure (Cincinnati U.)
We show that a large mixing between the right-handed charm and top squarks (i) is allowed by low-energy flavour constraints; (ii) reduces the experimental bound on the stop mass; (iii) has a mild, but beneficial, effect on fine-tuning; (iv) leads to interesting signatures at the LHC not presently investigated by experiments. We estimate the current bound on the stop mass, in presence of flavour mixing, and discuss the new collider signatures. [...]
arXiv:1302.7232; CERN-PH-TH-2013-037.- 2013 - 20 p. - Published in : J. High Energy Phys. 06 (2013) 022 External link: Preprint

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2013-02-13
13:27
Fluctuations of inflationary magnetogenesis / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
This analysis aims at exploring what can be said about the growth rate of magnetized inhomogeneities under two concurrent hypotheses: a phase of quasi-de Sitter dynamics driven by a single inflaton field and the simultaneous presence of a spectator field coupled to gravity and to the gauge sector. Instead of invoking ad hoc correlations between the various components, the system of scalar inhomogeneities is diagonalized in terms of two gauge-invariant quasi-normal modes whose weighted sum gives the curvature perturbations on comoving orthogonal hypersurfaces. [...]
arXiv:1302.2243; CERN-PH-TH-2012-367.- 2013 - Published in : Phys. Rev. D 87 (2013) 083004 APS published version, local copy: PDF; External link: Preprint

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2012-12-04
13:26
B-physics from lattice QCD...with a twist / Carrasco, N (Valencia U. ; Valencia U., IFIC) ; Dimopoulos, P (Rome U.,Tor Vergata ; INFN, Rome2) ; Frezzotti, R (Rome U.,Tor Vergata ; INFN, Rome2) ; Gimenez, V (Valencia U. ; Valencia U., IFIC) ; Herdoiza, G (Madrid, Autonoma U. ; Madrid, IFT) ; Lubicz, V (Rome III U. ; INFN, Rome3) ; Martinelli, G (SISSA, Trieste ; INFN, Rome) ; Michael, C (Liverpool U., Dept. Math.) ; Palao, D (INFN, Rome2) ; Rossi, G C (Rome U.,Tor Vergata ; INFN, Rome2) et al.
We present a precise lattice QCD determination of the b-quark mass, of the B and Bs decay constants and first results for the B-meson bag parameters. For our computation we employ the so-called ratio method and our results benefit from the use of improved interpolating operators for the B-mesons. [...]
arXiv:1212.0301; IFIC-12-80; FTUAM-12-113; IFT-UAM-CSIC-12-111; RM3-TH-12-20; LTH966; CERN-PH-TH-2012-328.- 2012 - 6 p. - Published in : PoS: ICHEP2012 (2012) , pp. 428 External link: Preprint
In : 36th International Conference on High Energy Physics, Melbourne, Australia, 4 - 11 Jul 2012, pp.428

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2012-11-29
13:27
New physics search with flavour in the LHC era / Hurth, Tobias (Mainz U., Inst. Phys.) ; Mahmoudi, Farvah (CERN ; Clermont-Ferrand U.)
We give a status report on quark flavour physics in view of the latest data from the B factories and the LHC, and discuss the impact of the latest experimental results on new physics in the MFV framework. We also show some examples of the implications in supersymmetry..
arXiv:1211.6453; MZ-TH-12-49; CERN-PH-TH-2012-330.- 2013 - 16 p. - Published in : Rev. Mod. Phys. 85 (2013) 795 External link: Preprint
In : 18th International Symposium on Particles, Strings and Cosmology, Merida, Yucatan, Mexico, 3 - 8 Jun 2012
3rd Meeting on Implications of LHC Results for TeV-scale Physics, CERN, Geneva, Switzerland, 13 - 17 Jul 2012

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2012-10-04
12:54
Twisting all the way: from algebras to morphisms and connections / Aschieri, Paolo (CERN ; Piemonte Orientale U., Alessandria ; INFN, Alessandria)
Given a Hopf algebra H and an algebra A that is an H-module algebra we consider the category of left H-modules and A-bimodules, where morphisms are just right A-linear maps (not necessarily H-equivariant). Given a twist F of H we then quantize (deform) H to H^F, A to A_\star and correspondingly the category of left H-modules and A-bimodules to the category of left H^F-modules and A_\star-bimodules. [...]
arXiv:1210.1143; CERN-PH-TH-2012-064.- 2012 - 15 p. - Published in : Int. J. Mod. Phys.: Conf. Ser.: 13 (2012) , pp. 1-19 External link: Preprint
In : Workshop of Scientific and Human Legacy of Julius Wess, Donji Milanovac, Serbia, 27 - 29 Aug 2011, pp.1-19

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2012-10-01
12:39
Anomalous Majorana Neutrino Masses from Torsionful Quantum Gravity / Mavromatos, Nick E (King's Coll. London ; CERN) ; Pilaftsis, Apostolos (Manchester U. ; CERN)
The effect of quantum torsion in theories of quantum gravity is usually described by an axion-like field which couples to matter and to gravitation and radiation gauge fields. In perturbation theory, the couplings of this torsion-descent axion field are of derivative type and so preserve a shift symmetry. [...]
arXiv:1209.6387; KCL-PH-TH-2012-39; LCTS-2012-23; CERN-PH-TH-2012-243; MAN-HEP-2012-15.- 2012 - 9 p. - Published in : Phys. Rev. D 86 (2012) 124038 External link: Preprint

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2012-09-27
16:49
Beyond SUSY and the Standard Model : Exotica / Grojean, Christophe (CERN) ; Hebbeker, Thomas (Aachen, Tech. Hochsch.) ; Meyer, Arnd (Aachen, Tech. Hochsch.)
CERN-PH-TH-2011-099.- 2011
In : Physics at the terascale, pp.209-223 (Ch. 10)

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2012-09-07
10:22
Metastable Charged Sparticles and the Cosmological Li7 Problem / Cyburt, Richard H (Michigan State U., JINA ; Michigan State U., NSCL) ; Ellis, John (King's Coll. London ; CERN) ; Fields, Brian D (Illinois U., Urbana (main)) ; Luo, Feng (King's Coll. London ; Minnesota U.) ; Olive, Keith A (Minnesota U.) ; Spanos, Vassilis C (Democritos Nucl. Res. Ctr.)
We consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new code to track their abundances, paying particular attention to that of Li7. [...]
arXiv:1209.1347; KCL-PH-TH-2012-36; LCTS-2012-18; CERN-PH-TH-2012-223; UMN-TH-3117-12; FTPI-MINN-12-29.- 2012 - Published in : J. Cosmol. Astropart. Phys. 12 (2012) 037 External link: Preprint

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2012-09-05
10:02
Testing Lorentz invariance of dark matter / Blas, Diego (CERN) ; Ivanov, Mikhail M (Moscow State U. ; Moscow, INR) ; Sibiryakov, Sergey (Moscow, INR ; Moscow State U.)
We study the possibility to constrain deviations from Lorentz invariance in dark matter (DM) with cosmological observations. Breaking of Lorentz invariance generically introduces new light gravitational degrees of freedom, which we represent through a dynamical timelike vector field. [...]
arXiv:1209.0464; CERN-PH-TH-2012-234.- 2012 - Published in : J. Cosmol. Astropart. Phys. 10 (2012) 057 External link: Preprint

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2012-09-03
09:53
Testing new physics with the electron g-2 / Giudice, G F (CERN) ; Paradisi, P (CERN) ; Passera, M (INFN, Padua)
We argue that the anomalous magnetic moment of the electron (a_e) can be used to probe new physics. We show that the present bound on new-physics contributions to a_e is 8*10^-13, but the sensitivity can be improved by about an order of magnitude with new measurements of a_e and more refined determinations of alpha in atomic-physics experiments. [...]
arXiv:1208.6583; CERN-PH-TH-2012-017.- 2012 - Published in : J. High Energy Phys. 12 (2012) 113 Springer Open Access article: PDF; External link: Preprint

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