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This thesis presents the first search for a neutral Minimal Supersymmetric Standard Model Higgs boson decaying to a pair of hadronic taus in proton-proton collisions with a center-of-mass energy of √s = 7 TeV. Results are presented for an integrated lumi- nosity of 1.056 fb−1 using data from the ATLAS detector at the Large Hadron Collider. After signal selection, 245 events are observed. The number of events is consistent the background estimate of 256 ± 26. An exclusion limit for the Higgs boson production is derived as a function of (cross-section)×(branching ratio). This limit is presented as a function of two parameters: mA and tanβ in the mmax scenario. A point in the (mA, h tanβ) phase space is excluded if the signal hypothesis is rejected at the 95% confidence level.

This thesis presents the first search for a neutral Minimal Supersymmetric Standard Model Higgs boson decaying to a pair of hadronic taus in proton-proton collisions with a center-of-mass energy of √s = 7 TeV. Results are presented for an integrated lumi- nosity of 1.056 fb−1 using data from the ATLAS detector at the Large Hadron Collider. After signal selection, 245 events are observed. The number of events is consistent the background estimate of 256 ± 26. An exclusion limit for the Higgs boson production is derived as a function of (cross-section)×(branching ratio). This limit is presented as a function of two parameters: mA and tanβ in the mmax scenario. A point in the (mA, h tanβ) phase space is excluded if the signal hypothesis is rejected at the 95% confidence level.

This thesis presents a first study of the continuum limit of light hadronic physics using a lattice gauge theory simulation with good chiral symmetry. The results are interpreted and extrapolated using both the chiral effective theory and analytic models. Matrix elements of operators of the effective weak Hamiltonian are calculated. The thesis details a combined chiral and continuum extrapolation of two ensemble sets of 2+1 flavour Domain Wall QCD data with inverse lattice spacings around 1.73 and 2.32 GeV. A novel procedure of matching lattice data at unphysical quark masses is used to define the scaling trajectory to the continuum limit. Quantities studied include the pion and kaon masses and decay constants, the average up/down quark mass, the strange quark mass, and the neutral kaon mixing parameter BK. The latter is an important theoretical input to the K band in the unitarity triangle of the CKM matrix. A subset of recent results of ref. [1] in the chiral effective theory needed to perform our fits are re-derived. New methods for the improved determination of the BK matrix element (and other correlation functions), and also for the renormalisation of the relevant four-quark operator for BK are presented.

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