Measurement of alpha_s in radiative hadronic events at OPAL

Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around \Mz with the OPAL detector at LEP. The strong coupling \as is extracted by fitting event shape variables for the reduced centre-of-mass energies ranging from 20 GeV to 80 GeV, and the energy dependence of \as is studied. Combining all the values using different event shape variables and energies gives: \asmz=0.1176\pm 0.0012(stat.)^{+0.0093}_{-0.0085}(syst.).Comment: 4 pages, 1 figure, contribution to the QCD '03 conferenc

Exploring digital encounters in the city

In this paper we explore the types of encounters that technology enables. We consider the differences between digital and non-digital encounters, and investigate how technology can be appropriated for shared interactions that support conscious (or unconscious) social encounters. Finally, we describe two prototypes that generate different types of digital encounters in a city context, and we discuss our initial results

Measurement of the strong coupling alpha_S in e+e- annihilation using the three-jet rate

We present a measurement of the strong coupling alpha_S using data collected with the JADE detector at centre-of-mass energies between 14 and 44 GeV. The three-jet rate as a function of the transition parameter ycut is determined using the Durham jet algorithm and the distribution is compared to QCD predictions. Recent theoretical calculations predict the three-jet rate at next-to-next-to-leading order. For the first time a measurement of alpha_S is presented using QCD predictions at next-to-next-to-leading order matched to predictions at next-to-leading logarithmic approximation, with subleading terms being included as well. We obtain alpha_S(Mz)=0.1199+-0.0010(stat.)+-0.0021(exp.)+-0.0054(had.)+-0.0007(theo.) being consistent with the world average value of alpha_S.Comment: 4 pages, 5 figures, Proceedings for the QCD July 2012 in Montpellie

Heavy Flavor Measurements in ATLAS and CMS

We present heavy flavor measurements performed by the ATLAS and CMS Collaborations with data collected at the Large Hadron Collider. The production mechanism of heavy flavor hadrons is discussed as well as lifetime measurements and searches for the rare decay Bs->mumu. The large available statistics of about 5 fb-1 per experiment collected during the year 2011 together with the excellent detector performance allows to perform competitive heavy flavor measurements.Comment: 8 pages, 12 figures, proceedings for Moriond EW 201

Determination of alpha_S using hadronic event shape distributions of data taken with the OPAL detector

The measurement of the strong coupling alpha_S using hadronic event shape distributions measured with the OPAL detector at center-of-mass energies between 91 and 209 GeV is summarized. For this measurement hadronic event shape distributions are compared to theoretical predictions based on next-to-next-to-leading-calculations (NNLO) and NNLO combined with resummed next-to-leading-logarithm calculations (NLLA). The combined result using NNLO calculations is alpha_S(MZ)=0.1201+-0.0008(stat.)+-0.0013(exp.)+-0.0010(had.)+-0.0024(theo.) and the result using NLLO and NLLA calculations is alpha_S(MZ)=0.1189+-0.0008(stat.)+-0.0016(exp.)=-0.0010(had.)+-0.0036(theo.), with both measurements being in agreement with the world average.Comment: 4 pages, 2 figures, contribution to the Proceedings of Rencontres de Moriond, QCD Session, March 20th - 27th, 2011 in La Thuile, Italy; based on arXiv:1101.147

Framework for the implementation of urban big screens in the public space

In the last decade, big urban screens have appeared in town squares and on building facades across the UK. The use of these screens brings new potentials and challenges for city regulators, artists, architects, urban designers, producers, broadcasters and advertisers. Dynamic moving images form new architectural material, affecting our perception and the experience of the space around us. A new form of urban space is emerging that is fundamentally different from what we have known, and it seems that we are ill-equipped to deal with and analyse it. We are just beginning to understand the opportunities for public information, art and community engagement. Most of screens at present serve mainly commercial purposes, they do not broadcast information aimed at sharing community content nor do they support public social interactions. We need to see more negotiation between commercial, public and cultural interests. The SCREAM project addresses these new challenges by looking at the physical urban spaces and the potential spaces created by the new technologies