Early Physics results from LHC
E - CTP
E - CTP
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Some of the physicists’ jargon<br />
• Cross section (σ)<br />
– A measure of ‘frequency’ of the physical process<br />
– Units: barns (10 -28 cm 2 )<br />
• Typical values: femtobarns (fb), picobarns (pb)<br />
• Luminosity (L)<br />
– Or instantenous luminosity<br />
– A measure of collisions ‘frequency’<br />
• Typical (at Tevatron/<strong>Early</strong> <strong>LHC</strong>): L = 10 32 cm -2 s -1<br />
• Integrated luminosity (L = ∫Ldt)<br />
– A measure of number of accumulated collisions after a certain time period<br />
– Units: (cross section) -1 …. E.g. 1 fb -1 = 1000 pb -1<br />
• Tipical (Tevatron/<strong>Early</strong> <strong>LHC</strong>): few fb -1 3<br />
jeudi 25 novembre 2010