WEXTER and ERAFITTER: two programs to fit M_W at LEP2 using the best measurable kinematical variables

In this paper, we present two programs to fit M_W at LEP2 using the best measurable kinematical variables. The theoretical probabilities of observing the final-state kinematical configurations are computed by integrating over the quantities that are not well measured. Therefore, an event-by-event kinematical reconstruction is avoided. M_W is then determined through a maximum likelihood fit.Comment: 19 pages, Latex fil

Assault on the NLO Wishlist: pp -> tt bb

We present the results of a next-to-leading order calculation of QCD corrections to the production of an on-shell top-anti-top quark pair in association with two flavored b-jets. Besides studying the total cross section and its scale dependence, we give several differential distributions. Where comparable, our results agree with a previous analysis. While the process under scrutiny is of major relevance for Higgs boson searches at the LHC, we use it to demonstrate the ability of our system built around Helac-Phegas to tackle complete calculations at the frontier of current studies for the LHC. On the technical side, we show how the virtual corrections are efficiently computed with Helac-1Loop, based on the OPP method and the reduction code CutTools, using reweighting and Monte Carlo over color configurations and polarizations. As far as the real corrections are concerned, we use the recently published Helac-Dipoles package. In connection with improvements of the latter, we give the last missing integrated dipole formulae necessary for a complete implementation of phase space restriction dependence in the massive dipole subtraction formalism.Comment: 19 pages, 11 figures, 2 tables. References added, version to appear in JHE

Towards an effective-action approach to fermion-loop corrections

We present a study of the effective action approach to incorporate higher-order effects in e^+e^- -> n fermions. In its minimal version, the effective action approach is found to exhibit problems with unitarity and high-energy behaviour. We identify the origin of these problems by investigating the zero-mode solutions of the Ward Identities. A numerical analysis of the importance of the zero-mode solutions is presented for four-fermion production processes.Comment: 43 pages, 1 figure. Accepted for publication in Nuclear Physics

Identification alone versus intraoperative neuromonitoring of the recurrent laryngeal nerve during thyroid surgery: experience of 2034 consecutive patients

Background: The aim of this study was to evaluate the ability of intraoperative neuromonitoring in reducing the postoperative recurrent laryngeal nerve palsy rate by a comparison between patients submitted to thyroidectomy with intraoperative neuromonitoring and with routine identification alone. Methods: Between June 2007 and December 2012, 2034 consecutive patients underwent thyroidectomy by a single surgical team. We compared patients who have had neuromonitoring and patients who have undergone surgery with nerve visualization alone. Patients in which neuromonitoring was not utilized (Group A) were 993, patients in which was utilized (group B) were 1041. Results: In group A 28 recurrent laryngeal nerve injuries were observed (2.82%), 21 (2.11%) transient and 7 (0.7%) permanent. In group B 23 recurrent laryngeal nerve injuries were observed (2.21%), in 17 cases (1.63%) transient and in 6 (0.58%) permanent. Differences were not statistically significative. Conclusions: Visual nerve identification remains the gold standard of recurrent laryngeal nerve management in thyroid surgery. Neuromonitoring helps to identify the nerve, in particular in difficult cases, but it did not decrease nerve injuries compared with visualization alone. Future studies are warranted to evaluate the benefit of intraoperative neuromonitoring in thyroidectomy, especially in conditions in which the recurrent nerve is at high risk of injury. Keywords: Neuromonitoring, Recurrent laryngeal nerve, Thyroidectom

Archaeobotanical interpretation of a Middle Bronze Age (1914-1641 cal BC) cave site in south-western Sardinia (Italy)

The Monte Meana karst cave is located in the Sulcis region, 5 km far from Santadi (SW Sardinia, Italy). The cave opens at 168 meters on the south-western side of Meana Mt. and the Murrecci river flows below. From the Middle Neolithic to the Middle Bronze age the cave has been inhabited. In the 1960s an alabaster quarry destroyed several archaeological strata. In the northern side of the cave, a small opening, here called ‘grottino’, was discovered under 1.50 m. of quarry's debris. Within it, an undamaged stratigraphy 1 m. depth and a sequence of four layers has been excavated in a 4mq area. At the top, a sandy layer, originated by quarrying activity, was also identified. Below, a dark brown deposit of 15-20 cm of thickness, characterized by several archaeological remains as pottery fragments, obsidian, copper slags, burnt bones, shells and a large amount of charcoals and carbonized seeds, has been investigated as well. In the underlying layers no archaeological remains have been found. The dark brown deposit (SU22) was protected and sealed by a recent sandy layer thus its sediment was uncontaminated. This fact has represented a lucky opportunity to identify some palaeoenvironmental features. Therefore, palynological and carpological analysis and characterization of palynofacies have been performed. The results bear out the presence of an open area around the site that included herbaceous plants and shrublands. Different agriculture practices as cereals and legumes cultivations are attested as well. The limited presence of pollen grains that are representative of arboreal plants during Middle Bronze Age is probably climate induced and linked to anthropic activities: for example, deforestation, burning for the cultivation of cereal crops, and the development of grazing areas

Reduction of one-loop amplitudes at the integrand level - NLO QCD calculations

Presented by C.G. Papadopulos at the Cracow Epiphany Confer ence on LHC Physics, Cracow, Poland, 4–6 January 2008.The recently proposed method (OPP) to extract the coefficients of the scalar one-loop integrals to any multi-particle (sub)-amplitude is described. Within this method no analytical information on the structure of the amplitude is needed, allowing for a purely numerical, but still algebraic, implementation of the algorithm. The algorithm can be used to automatically perform one-loop calculation both in QCD and in the EW Theory. As an application, we give QCD one-loop results for the process pp → ZZZ at the LHC.Work supported by HEPTOOLS, MRTN-CT-2006-035505 and ALGOT OOLS, MTKD-CT-2004-014319