Heavy ion physics with CMS detector

We analyse the impact of systematic effects due to the scale dependence of QCD corrections in combination with the use of different jet clustering algorithms in the measurement of the W^± mass in the fully hadronic decay mode of W⁺W⁻ pairs produced at LEP2. We consider higher order contributions induced by both virtual and real gluon radiation onto the electroweak CC03 and CC11 channels through (α_s) at the parton level. We find that the associated uncertainties can be of order 100 MeV, thus competitive with those possibly arising in the non-perturbative regime and indeed above the current experimental estimates.Work supported in part by the Ministero dell’Università e della Ricerca Scientifica and by the European Union under contract HPRN-CT-2000-00149.     

Prospects for B physics with the ATLAS and CMS detectors

The possibility of observing the radion using the ATLAS detector at the LHC is investigated. Studies on searches for the Standard Model Higgs with the ATLAS detector are re-interpreted to obtain limits on radion decay to γγ and ZZ^(*). The observability of radion decays into Higgs pairs, which subsequently decay into or is then estimated.     

Electroweak and CP violation physics at a Linear Collider Z-factory

A future linear collider such as TESLA may be able to run on the Z⁰ resonance with very high luminosity and polarised electron and positron beams. The possibilities of measuring electroweak quantities with high precision are investigated. Huge improvements with respect to the present precision can be expected, especially for the asymmetries A_LR and where beam polarisation can be exploited. The very large sample of events also allows studies of various CP-violating b decays. The precision achievable on the CKM unitarity triangle angles is comparable to experiments at b factories and future hadron colliders.     

CMS: Jet/b,Jet/<Emphasis Type="Italic">τ</Emphasis>, Missing E<Subscript>T</Subscript>

It is often claimed [1] that the (Hodge type) duality operation is defined only in even dimensional spacetimes and that self-duality is further restricted to twice-odd dimensional spacetime theories. The purpose of this paper is to extend the notion of both duality symmetry as well as self-duality.By considering tensorial doublets, we introduce a novel well-defined notion of self-duality based on a duality Hodge-type operation in arbitrary dimension and for any rank of these tensors. Thus, a generalized Self-Dual Action is defined such that equations of motion are the claimed generalized self-duality relations. We observe in addition, that taking the proper limit on the parameters of this action, it always provides us with a master-action, which interpolates models well-studied in physics; by considering a particular limit, we find an action which describes an interesting type of relation, referred to as semi-self-duality, which results to be the parent action between Maxwell-type actions.Finally, we apply these ideas to construct manifest Hodge-type self-dual solutions in a (2+1)-dimensional version of the Maxwell’s theory.     

xF_3^{\gamma Z} in charged lepton scattering

Measurements of the structure function are now becoming available in charged lepton deep inelastic scattering at HERA. The correction factors which are necessary to compare these with measurements of in neutrino-nucleon scattering are deduced and a comparison is made between the H1 and the CCFR data. A sum rule is derived for the structure function measured in charged lepton scattering which is the analogue of the Gross Llewellyn-Smith sum rule for neutrino-nucleon scattering.     

Hadronic vacuum polarization contribution to the Lamb shift in muonic hydrogen

We report on the accuracy of the measurement of the total cross section of the process e⁺e^– ZH and of the Higgs boson mass that would be achieved in a linear collider operating at a centre-of-mass energy of 350 GeV, assuming an integrated luminosity of 500 fb^–1. For that we have exploited the recoil mass off the Z using its leptonic decays into electron and muon pairs. The Higgs mass is determined with 150 MeV accuracy, the recoil mass resolution is about 1.5 GeV and the cross section is obtained with a statistical error of 3%.     

A preliminary search for Q-balls by delayed coincidences in NaI(Tl)

A preliminary search for Q-balls, stable non-topological solitons allowed by supersymmetric models, with highly radiopure NaI(Tl) detectors is discussed.     

Cherenkov detectors in particle physics

The most impressive examples of the application of Cherenkov detectors in modern-physics experiments are considered.     

Towards the european strategy for particle physics: The briefing book

This document was prepared as part of the briefing material for the Workshop of the CERN Council Strategy Group, held in DESY Zeuthen from 2nd to 6th May 2006. It gives an overview of the physics issues and of the technological challenges that will shape the future of the field, and incorporates material presented and discussed during the Symposium on the European Strategy for Particle Physics, held in Orsay from 30th January to 2nd February 2006, reflecting the various opinions of the European community as recorded in written submissions to the Strategy Group and in the discussions at the Symposium.     

The de Sitter-Castelnuovo universe and elementary particle physics

If we study the de Sitter universe in the geodetic representation, we obtain the projective relativity, valid on the cosmic scale, for hyperdense matter and high energies. The new theory can be applied also to quantum and elementary particle physics. In this work we examine the angular momentum operator, the D'Alembertian generalized equation, and study the electron, conceived as an oscillating microuniverse.Work sponsored by GNFM-CNR.     

Fractal diffusion processes in particle physics

A series of consistent measurements of kinematic variables for pion diffraction production processes by pions with an initial momentum of about 4 GeV/c were analyzed: π ⁺ + p → p + 2π ⁺ + π ^? and π ^? + p → p + 2π ^? + π ⁺. The Hurst method analysis discovered the presence of the memory effect for both data arrays. The distributions of the transition probability density appeared to seek some equilibrium shape, characteristic of the fractal Brownian motion (FBM). The process can be defined by the special diffusion Fokker-Planck equation (FPE). The obtained values of Hurst coefficient 0.5 < H < 1, which is a parameter of FPE, mean that the processes explored are realized in fractal generalized phase space with fractional dimension.     

Topics on fundamental symmetries in particle physics

Topics on the test of fundamental symmetries are shown. Comparison of the gravitational interactions between particle and anti-particle is one of the most important experiments for the test of the CPT-theorem. The measurement of K _L ⁰ →π⁰e^{+ -} is being carried out in order to find the direct CP-violating amplitude. Several experiments to search for the T-violation are being carried out. The muon polarization in K⁺→π⁰μ⁺υdecay and the electron polarization in the β-decay of polarized⁸Li are very interesting from the viewpoint of T-violation. Recent progress of the measurement of electric dipole moments of atoms and the neutron are mentioned. Studies of parity-violating processes in nucleon-nucleon scattering and nucleon-nucleus reactions are discussed. The results encourage us to measure the T-violation using polarized neutrons and a polarized nuclear target.