|
1
|
- Ronan McNulty
- (University of Liverpool)
- on behalf of the UK CDF groups:
- Glasgow; Liverpool; Oxford; UCL.
|
|
2
|
- Explore areas of common interest between theorists/phenomenologists at
IPPP and experimentalists at the Tevatron.
- Shopping list of theoretical questions and desires
- Brief Status of collider and detector
- Concentrate on physics measurements that UK is involved in. (RAL status report
http://hep.ph.liv.ac.uk/cdf/Liverpool/group/talks.html)
- Highlight theoretical/phenomenological problems that we experimentalists
see
- Maybe we can compile a list of common topics and follow it up with more
detailed discussions with relevant experts.
|
|
3
|
|
|
4
|
|
|
5
|
- Run I: 120 pb-1 until 1996
- Run II:
- Started March 2001
- 2 fb-1 by 2006
- 6.5 fb-1 by 2008
- Disappointing startup but have now exceeded Run I luminosity!
- Peak luminosity increasing
- Run I best: 2.8x1031 cm-2s-1
- Run II best: 3.5x1031 cm-2s-1
- Run II goal: 20 x1031 cm-2s-1
|
|
6
|
|
|
7
|
- Major upgrades
- trigger/DAQ
- Plug calorimeters
- Silicon tracker
- Tracking drift chamber
- Started March 2001
- >100 pb-1 of good data by now
|
|
8
|
|
|
9
|
- Level 2 hadronic B trigger
- s(d0) ~ 48 mm
- 15 ms operation
- online primary vertex finding, tracking
- trigger on displaced vertices
|
|
10
|
- TOF resolution within 10 –20% of design value (100 ps)
- Calibration ongoing
|
|
11
|
|
|
12
|
|
|
13
|
|
|
14
|
|
|
15
|
|
|
16
|
|
|
17
|
|
|
18
|
|
|
19
|
|
|
20
|
|
|
21
|
|
|
22
|
|
|
23
|
|
|
24
|
- Tag W by decay to hard isolated e,m
- Calorimetry scale set by Z, resonances (J/y)
- Obtain m(W), G(W) from transverse mass fit
|
|
25
|
|
|
26
|
|
|
27
|
|
|
28
|
|
|
29
|
|
|
30
|
|
|
31
|
|
|
32
|
|
|
33
|
|
|
34
|
|
|
35
|
|
|
36
|
|
|
37
|
|
|
38
|
|
|
39
|
|
|
40
|
|
|
41
|
- Is it a Standard Model Top?
- Can it be a probe for New Physics?
- Can it tell us about the Higgs?
|
|
42
|
- Does the cross-section agree with QCD?
- Does the mass agree with SM
- Are decays as expected? Count e, m,t,
jets, b-jets.
- Check kinematics: pT & angular distributions
|
|
43
|
|
|
44
|
|
|
45
|
- Probe for new physics
- Non SM production X->tt
- Non SM decay t->Xb
- Resonances in tt production
- Topcolour: qq->V->tt
- Technicolour: qq->hT->tt
- In some models tt condensate explains large top mass/EWSB
- SUSY
- stop: t->t+c0 & t->b+l+v
- gluino -> stop + top
- SUSY Higgs
- t->b + H+ => enhanced t s.
|
|
46
|
|
|
47
|
|
|
48
|
|
|
49
|
|
|
50
|
|
|
51
|
|
|
52
|
- Increased c/s at high Et, quite apart from luminosity increase
- Better forward calorimeters
- Is excess in barrel and forward (PDF) or confined to barrel (New
Physics?)
|
|
53
|
|
|
54
|
|
|
55
|
|
|
56
|
|
|
57
|
|
|
58
|
|
|
59
|
|
|
60
|
|
|
61
|
- First measurements which CDF will perform in b sector
- Necessary step towards oscillation
- Best measurement of Bs0, Lb. (Unique)
|
|
62
|
|
|
63
|
|
|
64
|
- x = Dm/G
- Currently: xs > 14.6
- Projection for 15 fb-1:
- 20 000 Bs decays
- Effective tagging eff. *2 cf. Run 1
- Sensitive to xs < 63
|
|
65
|
- Dm DG = f (tH, tL )
- Separate eigenstates and measure each lifetime
- BS ® DS+
DS- (CP even) Work continuing in triggering on
these difficult hadronic modes (track/vertex/reconstruct)
- BS ® J/y f (CP even&odd) Different angular
distribution for mm allow separation of CP even and odd states
- BS ® J/y
h (CP odd)
|
|
66
|
|
|
67
|
- In QCD and top measurements, as well as searches, we would like to know
the original parton energy.
- Experimentally we observe jets
- Definition of jet
- Energy correction scheme (how to go from jet energy to parent parton)
|
|
68
|
- We see a peak on top of background
- BUT
- How is the peak position related to the top quark mass?
|
|
69
|
|
|
70
|
- Naively balance photon and jet in g + jet events
- Would like to validate:
|
|
71
|
|
|
72
|
|
|
73
|
|
|
74
|
|
|
75
|
|
|
76
|
|
|
77
|
|
|
78
|
|
Notes
