1. Double Pomeron Exchange (DPE)
el. scatt.
Karsten Eggert–

2. Final Differential Cross-Section
B = 23.6 GeV -2
B = 20.1 GeV -2
Extrapolation to t = 0:
Exponential slope
Good agreement with the measurement
at |t| > 0.36 GeV2
[EPL 95 (2011) 41001]
Total elastic cross-section:
Karsten Eggert–

3. Closest approach at 90 m run (~4.8 s)
Karsten Eggert–

4. Correlation of the two protons
Last run ( ~10 s )
t min ~ GeV 2
Int. luminosity: 1.9 mbarn -1
26 k elastic events
This run( ~4.5 s )
t min ~ GeV 2
Karsten Eggert–

5. Run with b* = 90 m today (18. Oct. 2011)
Beam configuration:
10 – 15 minibunches: 1 x p/bunch (pile-up 0.005)
TOTEM configuration:
5 s
All detectors T1, T2 and RP operational
Trigger: T1, T2 or RP
bunch crossings to evaluate trigger efficiency
Running time at least 4 hours
Physics goals
Luminosity indep. measurement of s tot
Study of diffraction (SD and DPE)
t - distribution of elast. scatt., DPE and SD
|t| GeV2
Karsten Eggert–