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B_{s,d} -> l+ l- in the Standard Model
/ Bobeth, Christoph (Munich, Tech. U.) ; Gorbahn, Martin (Liverpool U., Dept. Math. ; Munich, Tech. U.) ; Hermann, Thomas (KIT, Karlsruhe, TTP) ; Misiak, Mikolaj (Warsaw U. ; CERN) ; Stamou, Emmanuel (Munich, Tech. U. ; Weizmann Inst.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We combine our new results for the O(alpha_em) and O(alpha_s^2) corrections to B_{s,d} -> l^+ l^-, and present updated branching ratio predictions for these decays in the standard model. Inclusion of the new corrections removes major theoretical uncertainties of perturbative origin that have just begun to dominate over the parametric ones. [...]
arXiv:1311.0903; FLAVOUR(267104)-ERC-53; LTH-990; SFB-CPP-13-82; TTP13-033; FLAVOUR(267104)-ERC-53; LTH 990; SFB-CPP-13-82; TTP13-033.-
2014-03-11 - 4 p.
- Published in : Phys. Rev. Lett. 112 (2014) 101801
Fulltext: PDF; External link: Preprint
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SUSY naturalness without prejudice
/ Ghilencea, D.M. (CERN ; Bucharest, IFIN-HH)
Unlike the Standard Model (SM), supersymmetric models stabilize the electroweak (EW) scale $v$ at the quantum level and {\it predict} that $v$ is a function of the TeV-valued SUSY parameters ($\gamma_\alpha$) of the UV Lagrangian. We show that the (inverse of the) covariance matrix of the model in the basis of these parameters and the usual deviation $\delta\chi^2$ (from $\chi^2_{min}$ of a model) automatically encode information about the "traditional" EW fine-tuning measuring this stability, {\it provided that} the EW scale $v\sim m_Z$ is indeed regarded as a function $v=v(\gamma)$. [...]
arXiv:1311.6144; CERN-PH-TH-2013-271; CERN-PH-TH-2013-271.-
2014-05-08 - 8 p.
- Published in : Phys. Rev. D 89 (2014) 095007
APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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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; CERN-PH-TH-2014-164.-
2014-11-11 - 17 p.
- Published in : Phys. Rev. D 90 (2014) 095008
Fulltext: PDF; External link: Preprint
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Infinitely many inequivalent field theories from one Lagrangian
/ Bender, Carl M. (Washington U., St. Louis ; King's Coll. London ; London, City U.) ; Hook, Daniel W. (Washington U., St. Louis ; Imperial Coll., London) ; Mavromatos, Nick E. (King's Coll. London ; CERN) ; Sarkar, Sarben (King's Coll. London)
Logarithmic time-like Liouville quantum field theory has a generalized PT invariance, where T is the time-reversal operator and P stands for an S-duality reflection of the Liouville field $\phi$. In Euclidean space the Lagrangian of such a theory, $L=\frac{1}{2}(\nabla\phi)^2-ig\phi\exp(ia\phi)$, is analyzed using the techniques of PT-symmetric quantum theory. [...]
arXiv:1408.2432; PREPRINT-KCL-PH-TH-2014-27; LCTS-2014-26; PREPRINT KCL-PH-TH-2014-27.-
2014-12-03 - 5 p.
- Published in : Phys. Rev. Lett. 113 (2014) 231605
Fulltext: PDF; External link: Preprint
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The chiral phase transition in two-flavor QCD from imaginary chemical potential
/ Bonati, Claudio (INFN, Pisa ; Pisa U.) ; de Forcrand, Philippe (CERN ; Zurich, ETH) ; 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; CERN-PH-TH-2014-158; IFUP-TH-2014-8.-
2014-10-23 - 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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String Resonances at Hadron Colliders
/ Anchordoqui, Luis A. (Lehman Coll.) ; Antoniadis, Ignatios (CERN) ; Dai, De-Chang (Shanghai Jiaotong U.) ; 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; MPP--2014--314; MPP--2014--314; LMU-ASC 48-14; CERN-PH-TH-2014-143.-
2014-09-26 - 47 p.
- Published in : Phys. Rev. D 90 (2014) 066013
APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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