Conosci i tuoi mesoni

Il primo layer dell'inner detector (ID) di ATLAS dista 4 cm dall'interaction point (IP), per cui: * pi0 decadono immediatamente (ctau~25 nm) e nel detector arrivano solo i gamma; * pi carichi hanno ctau~7 m ed entrano nell'ID; * K0_S decadono rapidamente (ctau~2.6 cm) e nel detector arrivano solo i prodotti di decadimento. il vertice dei K0_S e' una delle …

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Live Blogging: #Higgs Boson

One day before: Update from CDF/D0 Tevatron's experiments CDF and D0 just published their most up-to-date searches for the Standard Model Higgs boson. You can read the preprint here [arXiv:1207.0449] and take a closer look at the bonanza of new plots here.What they see is a mild excess especially in the h->bb decay channel, for which …

The Hunt for the Higgs Boson

Forewords The hunt officially started on Oct 19th, 1964 when Peter Higgs published a paper called "Broken symmetries and the masses of gauge bosons" on Physical Review Letters (Vol 13, No. 16). Nowadays, his brilliant explanation about the origin of the mass of elementary particles is being tested in two laboratories: at Fermilab, 80 miles …

ATLAS: Last detector connected

The LUCID detector, which will measure the luminosity of the collisions occurring in the centre of ATLAS, was among the last pieces of the detector to get approval. In fact, the small collaboration, based in Bologna, Italy; Alberta, Canada; Lund, Sweden; and at CERN, didn’t even begin building until February of last year. LUCID is …