Table 1.

Selected LHC parameters for pp collisions at $\sqrt{s}=7$ $\text{TeV}$ in 2010 and 2011, and at $\sqrt{s}=8$ $\text{TeV}$ in 2012. Values shown are representative of the best accelerator performance during normal physics operation

Parameter	2010	2011	2012
Number of bunch pairs colliding ($n_{\mathrm{b}}$)	348	1331	1380
Bunch spacing (ns)	150	50	50
Typical bunch population (${10}^{11}$ protons)	0.9	1.2	1.7
Peak luminosity ${\mathcal{L}}_{\mathrm{peak}}$ (${10}^{33}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$)	0.2	3.6	7.7
Peak number of inelastic interactions per crossing	$\sim$5	$\sim$20	$\sim$40
Average number of interactions per crossing (luminosity weighted)	$\sim$2	$\sim$9	$\sim$21
Total integrated luminosity delivered	$47{\mathrm{pb}}^{-1}$	$5.5{\mathrm{fb}}^{-1}$	$23{\mathrm{fb}}^{-1}$