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Dispelling the N3 myth for the kt jetfinder
 Phys.Lett. B641 (2006) 57–61
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Reconstructing sparticle mass spectra using hadronic decays,” JHEP 0705
, 2007
"... Most sparticle decay cascades envisaged at the Large Hadron Collider (LHC) involve hadronic decays of intermediate particles. We use stateofthe art techniques based on the K ⊥ jet algorithm to reconstruct the resulting hadronic final states for simulated LHC events in a number of benchmark supersy ..."
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Cited by 21 (2 self)
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Most sparticle decay cascades envisaged at the Large Hadron Collider (LHC) involve hadronic decays of intermediate particles. We use stateofthe art techniques based on the K ⊥ jet algorithm to reconstruct the resulting hadronic final states for simulated LHC events in a number of benchmark supersymmetric scenarios. In particular, we show that a general method of selecting preferentially boosted massive particles such as W ±,Z 0 or Higgs bosons decaying to jets, using subjets found by the K ⊥ algorithm, suppresses QCD backgrounds and thereby enhances the observability of signals that would otherwise be indistinct. Consequently, measurements of the supersymmetric mass spectrum at the percent level can be obtained from cascades including the hadronic decays of such massive intermediate bosons.
RenormalizationGroup Improved Calculation of the B → Xsγ Branching Ratio (hepph/0408179
"... Using results on softcollinear factorization for inclusive Bmeson decay distributions, a systematic study of the partial B → Xsγ decay rate with a cut Eγ ≥ E0 on photon energy is performed. For values of E0 below about 1.9 GeV, the rate can be calculated without reference to shape functions using ..."
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Using results on softcollinear factorization for inclusive Bmeson decay distributions, a systematic study of the partial B → Xsγ decay rate with a cut Eγ ≥ E0 on photon energy is performed. For values of E0 below about 1.9 GeV, the rate can be calculated without reference to shape functions using a multiscale operator product expansion (MSOPE). The transition from the shapefunction region to the MSOPE region is studied analytically. The resulting prediction for the B → Xsγ branching ratio depends on three large scales: mb, √ mb∆, and ∆ = mb − 2E0. Logarithms associated with these scales are resummed at nexttonexttoleading logarithmic order. While power corrections in ΛQCD/ ∆ turn out to be small, the sensitivity to the scale ∆ ≈ 1.1 GeV (for E0 ≈ 1.8 GeV) introduces significant perturbative uncertainties, which so far have been ignored. The new theoretical prediction for the B → Xsγ branching ratio with +0.31 +0.32 Eγ ≥ 1.8 GeV is Br(B → Xsγ) = (3.38 −0.42 −0.30) × 10−4, where the first error is an estimate of perturbative uncertainties and the second one reflects uncertainties in input
Electroweak Symmetry Breaking and the Higgs Boson: Confronting Theories at Colliders, Int.J.Mod.Phys. A28
, 2013
"... In this review, we discuss methods of parsing direct and indirect information from collider experiments regarding the Higgs boson and describe simple ways in which experimental likelihoods can be consistently reconstructed and interfaced with model predictions in pertinent parameter spaces. Ultimate ..."
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In this review, we discuss methods of parsing direct and indirect information from collider experiments regarding the Higgs boson and describe simple ways in which experimental likelihoods can be consistently reconstructed and interfaced with model predictions in pertinent parameter spaces. Ultimately these methods are used to constrain a fivedimensional parameter space describing a modelindependent framework for electroweak symmetry breaking. We review prevalent scenarios for extending the electroweak symmetry breaking sector relative to the Standard Model and emphasize their predictions for nonstandard Higgs phenomenology that could be observed in LHC data if naturalness is realized in particular ways. Specifically we identify how measurements of Higgs couplings can be used to imply the existence of new physics at particular scales within various contexts, highlighting some parameter spaces of interest in order to give examples of how the data surrounding the new state can most effectively be used to constrain specific models of weak scale physics.†
Surveying the Phenomenology of General Gauge Mediation,” arXiv:0812.2051 [hepph
"... I explore the phenomenology, constraints and tuning for several weakly coupled implementations of multiparameter gauge mediation and compare to minimal gauge mediation. The low energy spectra are distinct from that of minimal gauge mediation; a wide range of NLSPs is found and spectra are significa ..."
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I explore the phenomenology, constraints and tuning for several weakly coupled implementations of multiparameter gauge mediation and compare to minimal gauge mediation. The low energy spectra are distinct from that of minimal gauge mediation; a wide range of NLSPs is found and spectra are significantly compressed, thus tunings may Gauge mediation is a predictive and flavor blind communication mechanism for SUSY breaking [1]. The earliest and simplest implementation of minimal gauge mediation involved communication of SUSY breaking from the hidden sector through a single set of vector like messengers charged under standard
Three Lectures on Meson Mixing and CKM phenomenology
"... I give an introduction to the theory of mesonantimeson mixing, aiming at students who plan to work at a flavour physics experiment or intend to do associated theoretical studies. I derive the formulae for the time evolution of a neutral meson system and show how the mass and width differences among ..."
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I give an introduction to the theory of mesonantimeson mixing, aiming at students who plan to work at a flavour physics experiment or intend to do associated theoretical studies. I derive the formulae for the time evolution of a neutral meson system and show how the mass and width differences among the neutral meson eigenstates and the CP phase in mixing are calculated in the Standard Model. Special emphasis is laid on CP violation, which is covered in detail for K−K mixing, Bd−Bd mixing and Bs−Bs mixing. I explain the constraints on the apex (ρ, η) of the unitarity triangle implied by ǫK, ∆MB d, ∆MB d /∆MBs and various mixinginduced CP asymmetries such as aCP(Bd → J/ψKshort)(t). The impact of a future measurement of CP violation in flavourspecific Bd decays is also shown. 1 First lecture: A bigbrush picture 1.1 Mesons, quarks and box diagrams The neutral K, D, Bd and Bs mesons are the only hadrons which mix with their antiparticles. These meson states are flavour eigenstates and the corresponding antimesons K, D, Bd and Bs have opposite flavour quantum numbers:
Theoretical considerations on multiparton interactions
 in QCD”, Phys. Lett. B 698, 389 (2011) [arXiv:1102.3081 [hepph
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LHC constraints on twoHiggs doublet models
 JHEP 1307 (2013) 053. arXiv:1302.4022
"... A new Higgslike boson with mass around 126 GeV has recently been discovered at the LHC. The available data on this new particle is analyzed within the context of twoHiggs doublet models without treelevel flavourchanging neutral currents. Keeping the generic Yukawa structure of the Aligned TwoHi ..."
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Cited by 9 (2 self)
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A new Higgslike boson with mass around 126 GeV has recently been discovered at the LHC. The available data on this new particle is analyzed within the context of twoHiggs doublet models without treelevel flavourchanging neutral currents. Keeping the generic Yukawa structure of the Aligned TwoHiggs Doublet Model framework, we study the implications of the LHC data on the allowed scalar spectrum. We analyze both the CPviolating and CPconserving cases, and a few particular limits with a reduced number of free parameters, such as the usual models based on discrete Z2 symmetries. 1 ar
New results for t¯t production at hadron colliders
, 907
"... We present new theoretical predictions for the t¯t production cross section at NNLO at the Tevatron and the LHC. We discuss the scale uncertainty and the errors due to the parton distribution functions (PDFs). For the LHC, we present a fit formula for the pair production cross section as a function ..."
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We present new theoretical predictions for the t¯t production cross section at NNLO at the Tevatron and the LHC. We discuss the scale uncertainty and the errors due to the parton distribution functions (PDFs). For the LHC, we present a fit formula for the pair production cross section as a function of the center of mass energy and we provide predictions for the pair production cross section of a hypothetical heavy fourth generation quark t ′. 1 t¯t Production at Tevatron and LHC The experimental measurements of the top mass mt and the t¯t production cross section have reached a relative accuracy of 0.75 % [2] and 9 % [3], respectively. Therefore it is necessary to provide improved theoretical predictions for the total cross section at the Tevatron and the LHC in perturbative QCD. The total hadronic cross section for t¯t production depends on the top mass mt, the center of mass energy s = E2, the factorisation scale µf, the renormalization scale µr, and the PDF set and it is given by σ(s, mt, µr, µf) =