P. Sphicas Physics (status and plans) Sep 25, 2008 Physics Coordination Meeting 1 Physics (“status” and “plans”) n Outline u Introduction/reminder of original.

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Presentation transcript:

P. Sphicas Physics (status and plans) Sep 25, 2008 Physics Coordination Meeting 1 Physics (“status” and “plans”) n Outline u Introduction/reminder of original plan u And now? u New meeting structure u (very rough) plan of work for the next six months P.Sphicas CMS Collaboration Meeting Sep 25, 2008

Reminder (of what we were planning up until Friday Sep 19, 2008)

P. Sphicas Physics (status and plans) Making a physics plan n Main characteristics of fall 2008: u Dominated by detector startup. Need to increase involvement and attention (from “physics”) in detector commissioning matters (and from the detector community in physics). u Physics startup. Focus must be on electrons, muons, jets, missing Et, p-flow, tau… not on Higgs to two-photons u Communication: need to make links between the detector and physics groups stronger, more effective and faster l The central theme has to be (obviously) “detector performance and early physics” u Explicit Goals: we have to get out some early results: l First event pictures; First publicity plots l Some very early papers on 10 TeV l Measure trigger rates, exercise data flow, analysis teams… n The key: vertical integration & clear physics goals Sep 25, 2008 Physics Coordination Meeting 3

P. Sphicas Physics (status and plans) Vertical Integration and Physics Goals n We thus need to tackle two things: u The formation of effective, efficient groups working on “detector performance and physics object commissioning” l We need to have the “vertical integration meetings” as the norm not as “special events” u The formation of a number of analyses with clear physics goals (i.e. measurements) l We need to have the “CSA08 analyses” as the norm not as “proof-of-principle/debugging” exercises n Practical steps: u Need to reform (complete overhaul in fact) of the current meeting structure u Identify explicitly the early publications of CMS (along with the publicity plots) and launch the work on these – directly Sep 25, 2008 Physics Coordination Meeting 4

P. Sphicas Physics (status and plans) How to continue n The direction we are moving: u Factorize the work leading to a physics result from CMS into two pieces: l Joint DPG-Physics meetings starting in end September (after CMS week). è The output of these are the physics objects of CMS. Electrons, jets, muons, etc. l Given these objects, explicit analyses (e.g. W cross section measurement) under the responsibility of the corresponding Physics Analysis group (EWK in this case) è PAGs will (have already…) launch(ed) explicit activity on each “paper” Sep 25, 2008 Physics Coordination Meeting 5

And now?

P. Sphicas Physics (status and plans) From the press release… Sep 25, 2008 Physics Coordination Meeting 7 n Incident in LHC sector 34. Geneva, 20 September u During commissioning (without beam) of the final LHC sector (sector 34) at high current for operation at 5 TeV, an incident occurred at mid-day on Friday 19 September resulting in a large helium leak into the tunnel. Preliminary investigations indicate that the most likely cause of the problem was a faulty electrical connection between two magnets, which probably melted at high current leading to mechanical failure. CERN 's strict safety regulations ensured that at no time was there any risk to people. u A full investigation is underway, but it is already clear that the sector will have to be warmed up for repairs to take place. This implies a minimum of two months down time for LHC operation. For the same fault, not uncommon in a normally conducting machine, the repair time would be a matter of days. u Further details will be made available as soon as they are known.

P. Sphicas Physics (status and plans) New situation n By now we know that the delay of “at least two months” has been translated to “no beam in 2008” u Obviously, the loss is not just the Fall of 2008 u Physics-wise, in addition to losing “Fall08”, we also lose all the analysis work that we had planned for Jan-May u We need to redefine our program of work with an effective delay of 6-9 months n Our entire planning was pegged on the assumption that collisions were imminent u We would get a few days at 900 GeV u And we would be accumulating ~5-10 pb -1 at 10 TeV this fall l Thus the plans for Winter 2009 l And the early papers l And the halt to Monte-Carlo based approvals Sep 25, 2008 Physics Coordination Meeting 8

P. Sphicas Physics (status and plans) What next (I) Sep 25, 2008 n It’s clearly too early at this point to know precisely what the machine will do u Presumably, they will be asking us (the experiments) at some point what we prefer: X pb-1 at 10 TeV “in the pocket” or Y pb -1 at 14 TeV (presumably X>Y) l So we need to prepare to answer these questions u Presumably, our (CMS) position is that we want data, as much data as possible (even if it is at 9.8 TeV) l Imagine (just imagine) how much more we would know in four weeks from now if we had seen 900 GeV collisions this past weekend Physics Coordination Meeting 9

P. Sphicas Physics (status and plans) What next (II) Sep 25, 2008 n In physics, we had two activities and one grand project right before Friday u The 900 GeV analyses – the samples (min bias) were ready u The 10 TeV analyses – in the form of the “early papers” u The new meeting structure (with the joint DPG-PhysicsGroup meetings as the highlight) n We can and should continue the 900 GeV exercise u There is no reason to change it in any way n The 10 TeV data: we should turn to these samples as soon as possible u To repeat the analyses we have already done at 14 TeV u To gain experience with the new software and settings n And we must go on and implement what is fundamentally a really good way forward: the joint DPG-POG meetings Physics Coordination Meeting 10

(very rough) plan for the next six months

P. Sphicas Physics (status and plans) Highlights n Continue the 900 GeV analyses – to completion u Some nice results shown in the QCD meeting this week n Start analyses with the (soon arriving) 10 TeV samples; assume this is what we will run with u Recall: they have 3.8 T, 10 TeV and new tracker format (backwards incompatible) n Continue work on early publications u we should have full drafts ahead of time n What about new analysis approvals? u Given that we have a few months now ahead, we need to determine which results we want to update and which results we want to make public (afresh) l Need to tend to needs of younger collaborators working on theses and limited-term positions Sep 25, 2008 Physics Coordination Meeting 12

P. Sphicas Physics (status and plans) New results Sep 25, 2008 n New approvals: u Higgs: our currently approved results date back to the P-TDR. We should update them for the winter conferences (with Split 2008 we finish with current confs) Aim at a full collection of new results on WW, ZZ,  … u Top: our current results come from the special TOP2008 approvals. They are incomplete and do not represent the current status quo. l We should update this set of results u SUSY: we need to put out some key results – e.g. updates on the all-hadronic search, using the new data-driven ideas. Ditto for the early search with leptons. u Loose ends from every group (e.g. analyses that were stopped short in order to turn to the data, e.g. in Exotica, some late- comers in QCD, etc) n Goes without saying: we will apply the established (high) standards. All analyses are to be done as if we had data (the “real thing”) Physics Coordination Meeting 13

P. Sphicas Physics (status and plans) Feeding the analyses (I) Sep 25, 2008 n We need to plan a fastsim production u Assume 10 TeV, 50pb -1 like before. As soon as fastsim is ready (say in ~1 month). We’ll probably go with CMSSW_2_1 u Assume that fullsim samples (200 Mevt) are expendable l Whenever genuine new knowledge of the detector is included (e.g. CaloTaskForce, pixels, etc) we just push the button for another 200 Mevt n Question has come up: should we plan another challenge, e.g. CSA09? u The answer is probably “no”. It will be much more productive – and will help us prepare for data-taking: if we can run computing operations continuously l So we can afford to run the 200 Mevt for the “new knowledge” l For now: include signal samples in the 200 Mevt production Physics Coordination Meeting 14

P. Sphicas Physics (status and plans) Feeding the analyses (II) Sep 25, 2008 n Consolidate our state: there are three other parallel activities related to “tools” and the “how-to” u We now have a few more months than before l We should REALLY deploy the PAT throughout all groups u We have to co-organize the “feedback loops” that are currently taking too long: Release  validation  bugfind  bufix  re-release l Special samples and turn-around u We also need to check on the “analysis turn-around” l The large fastsim samples can be used for much of this è Should also consider (possible) exercises with the 200 Mevt fullsim as well u We need to complete the primary dataset exercise Physics Coordination Meeting 15

New meeting structure

P. Sphicas Physics (status and plans) “Vertical Integration” n Like all else, the discussion becomes one of meetings u Joint meetings on detector performance and physics (objects) n Our meeting structure should be one centered on the detector, its performance and the commissioning of physics objects u Change the current POG meetings into joint DPG-POG meetings, focused on all the “performance” issues u Supplement with ONE big plenary for the collaboration n We cannot add meetings; We have to hold them in the afternoon (GVA) u Detectors will clearly need a forum to discuss the startup and all that will occur in early data days. So target is the physics side. After some thought: concluded that we have to overhaul the complete meeting structure and adapt it to data-taking era Sep 25, 2008 Physics Coordination Meeting 17

P. Sphicas Physics (status and plans) Sep 25, 2008 Physics Coordination Meeting 18 New meeting structure n Broad-brush description: u All meetings bi-weekly; only afternoons, 14:30-18:30 (to allow for two meeting slots) u Mon afternoon: joint DPG-Physics and Trigger-DPG-PH l The agenda of each joint meeting will be agreed upon between POG and DPG conveners; Meetings run by POG conveners. u Tue afternoon: all physics meetings u Wed afternoon: plenary; “Detector Performance and Physics” u Thu and Fri: free for parallel meetings. E.g. for subgroups, working groups. Smaller groups: they can meet ad hoc (any time of the day or night) n Note “plenary investment” is minimal: one afternoon for DPG-physics and one afternoon for physics u Concentrating all physics meetings on a single day (Tue) makes scheduling of other activities easy(ier). Ditto for detector performance meetings. Plenary is major synchronization point.

P. Sphicas Physics (status and plans) Architecture/layout Sep 25, 2008 Physics Coordination Meeting 19

P. Sphicas Physics (status and plans) Monday Sep 25, 2008 Physics Coordination Meeting 20

P. Sphicas Physics (status and plans) Tuesday Sep 25, 2008 Physics Coordination Meeting 21

P. Sphicas Physics (status and plans) Wednesday Sep 25, 2008 Physics Coordination Meeting 22 But we start with biweekly plenary for now…

P. Sphicas Physics (status and plans) Summary Sep 25, 2008 n We have to consolidate our gains from the work of the last few months and stay on track: u We will launch the new joint meetings and the new meeting structure beginning next week u We should turn to the new MC samples asap l Continue 900 GeV analyses – to completion l Start 10 TeV analyses; assume this is what we will run with l Work on early publications: want full drafts ahead of time n New goals approvals (with caution): u Higgs, Top, SUSY. In all other cases, we should discuss things before we launch the analyses (for approval) n Need to work on: PAT (this is a must); Feedback loops; Analysis Turnaround; Primary datasets n And need to tell the machine to play it safe Physics Coordination Meeting 23