1 Bard: Interpreting New Frontier Energy Collider Physics Bruce Knuteson MIT DIS 0621 April 2006 The solution to the “LHC Inverse Problem”
2 The first sign of new physics will come from: Heavy gauge bosons Technicolor Large extra dimensions Leptoquarks Supersymmetry Fourth generation fermions Compositeness Something else
3 The values of the 105 MSSM parameters are:
4 Standard Model Data
5 Bard model construction “weave a story”
6 hep-ph/
7 If we see a signal, how do we interpret it in terms of the underlying physical theory?
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9 Generic new particles spin 0, ½, 1 electric charge n/3 color singlet, triplet or octet
10 Generic new vertices
11 Prune diagrams
12 Bard stories |g| 2 m 1 m 2 m 3
13 Bard output Ordered list of stories, together with best fit parameters and errors Analysis details are available from links
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15 Quaero status currently no competition DØ Run I PRL H1 L3 Aleph technically complete, not yet published CDF Run II under development discrepancy finding Run I data
16 (prediction) d(hep-ph)
17 Sleuth How do we find the excess? New physics will appear: 1. Predominantly in one exclusive final state 2. At large Σp T 3. As an excess quasi model independent
18 Sleuth / General Search status currently no competition D Ø Run I Phys.Rev.D 62:092004,2000 Phys.Rev.D 64:012004,2001 Phys.Rev.Lett.86:3712,2001 H1 Run I Phys.Lett.B 602:14-30,2004 P=0.03
19 Vista How do we understand the data in the first place? currently no competition
20 Vista Filter events of interest e j pp e Simulate detector response e jb e e-3 0.87 j 1e-42e-63e-36e-412e-3 b 1e-3 5e-38e true reconstructed ( mis ) Id Fit for experimental & theoretical fudge factors Define physics objects b Estimate backgrounds
21 toy example
22 Summary FermilabCERNDESY and many others Special thanks to: Interpreting new frontier energy collider physicsBard The solution to the “LHC Inverse Problem” Quickly testing specific hypothesesQuaero Finding an excessSleuth Systematically understanding the data in the first placeVista