Considering the Haystack: the pp Inelastic Cross ... - Physics Division
Considering the Haystack: the pp Inelastic Cross ... - Physics Division
Considering the Haystack: the pp Inelastic Cross ... - Physics Division
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Backgrounds (NBG) & Trigger (εtrig)<br />
• Beam gas and beam halo:<br />
• Measure with unpaired bunches :<br />
0.13% of total event sample<br />
• “Afterglow”: cavern radiation<br />
produced after a collision<br />
• Out-of-time afterglow measured by<br />
unpaired bunches<br />
• In-time afterglow measured from<br />
fractions of late hits in MBTS (0.4%)<br />
• Take 100% uncertainty on<br />
backgrounds:0.42%<br />
• Trigger is single MBTS trigger hit:<br />
• Measured with respect to offline<br />
selection to be 99.98% with an<br />
uncertainty of 0.09%<br />
LBL RPM<br />
05/22/2012<br />
Rate /Hz<br />
Rate /Hz<br />
10<br />
1<br />
0.48<br />
0.47<br />
0.46<br />
0.45<br />
0.44<br />
0.43<br />
0.42<br />
0.41<br />
0.4<br />
0.39<br />
0.38<br />
Afterglow<br />
ATLAS Preliminary<br />
Data 2010<br />
MBTS_C Triggers<br />
Unpaired<br />
bunches!<br />
0 500 1000 1500 2000 2500 3000 3500<br />
ATLAS Preliminary<br />
Data 2010<br />
Bunch Id<br />
MBTS_C Triggers<br />
800 1000 1200 1400 1600 1800 2000<br />
Bunch Id<br />
19
Change language