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PWG-DQ - Physics plans for 2012 Dileptons and quarkonia
5 Physics Analysis Groups (from low to high invariant masses) LMee (Low mass dielectrons) LMmumu (Low mass dimuons) Jpsi2ee (J/ ee) Jpsi2mumu (J/ ) Upsilon2mumu ( )
For each group First plots, where available, on analysis developments (especially from Pb2011) Plans for preliminary results (Hard Probes, Quark Matter) Need for productions Manpower Critical items
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LMmumu (A. DeFalco, R. Tieulent) Main items for 2012
pp at 2.76 TeV Results almost finalized for the Integrated and pT-differential cross sections extracted (pT>1 GeV) Now trying to optimize selections to recover lower-pT region Reminder: pp at 7 TeV paper submitted to PLB (arXiv:1112.2222)
PbPb, 2011 data Larger statistics with respect to 2010 However, unfavorable pT threshold (1 GeV/c) for the bulk of the data, taken with a dimuon trigger Use central and semi-central trigger sample
Some plots to give a flavor of what can be expected…..
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LMmumu - selected plotsPbPb2011
Combinatorial background subtractionCompare like-sign with mixed events under control to ~1% level
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LMmumu - selected plots
Compare opposite sign with background calculated through mixed and LS Some hints for / and in some bins after background subtraction Problem
S/B ~ 10-2 for central events need to understand background to 10-3 level
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LMmumu - plans Manpower: 2PhD + 1 post-doc + 5 senior (not full time)
pp at 2.76 TeV : finalize in spring, before Hard Probes RAA for low-mass hadrons: expected for Quark Matter
MC productions: no defined plan for the moment, start with short local productions, official requests to come later
Critical item: background subtraction
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(C. Baumann, T. Gunji)
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JPsi2mumu (R. Arnaldi, C. Suire) Main items for 2012
Completion of papers under development (mainly editorial work) Pb-Pb RAA pp at 2.76 TeV J/ yield vs multiplicity in pp
PbPb, 2011 data Larger statistics with respect to 2010 (~factor 20) J/ RAA differential in pT and centrality J/ elliptic flow Polarization (2S)
Several plots from Pb2011 already available…..
pp, 2011 data (2S) Larger pT coverage for cross sections and polarization
Higherpriority
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JPsi2mumu - plots
Dimuon trigger(bulk of the statistics)
Minimum biasCentralSemi-central
L. Valencia
R. Arnaldi
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JPsi2mumu – selected plots Preliminary investigations of RAA vs centrality and pT Warning: normalization still relies on 2010…..
…still, the compatibility of the shapes is already good news More work ahead on acceptances and normalization
R. Arnaldi
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JPsi2mumu – selected plots
We have as many high pT J/ as our total 2010 statistics Interesting hints: the “flat” centrality dependence for pT-integrated suppression is no more present at high pT
(quantity proportional to RAA)
L. Valencia
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JPsi2mumu – selected plots
centrality
v2 studies are advancing fast!
Event plane method: flattening to be still improved, event plane resolution to be taken into account
Gapped correlation method looks very promising too Developments in collaboration with the FLOW group
H. Yang
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JPsi2mumu – selected plots
(2S) visible for the first time in Pb-Pb at the LHC Tough analysis, significance is low
A. Lardeux
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JPsi2mumu – plans Manpower: 3PhD + 3 post-doc + 5 senior (not full time)
pp/PbPb papers (2010 data) out to the arXiv in a few weeks RAA differential in pT and centrality: for Hard Probes J/ elliptic flow: try to converge even before Hard Probes to a paper (PRL) Polarization: early to judge between HP and QM (2S): difficult to predict now
MC productions: need soon a production with embedding. Needs still some technical work from the experts
Critical item: none
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Intermezzo – p-Pb, Pb-p At the LHC, no knowledge on the nPDFs in the forward region and
large uncertainties in the backward region RHIC uses backward data to constrain σabs, needed for J/ too
3 scenarii under discussion
Scenario 3 has several advantages (same s, possibility of having same x-coverage by properly restricting the analysis domain in y) Might be difficult to implement (J.Jowett)
(see Cynthia presentation on Friday)
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(C. Blume, G. Bruno)
A couple of plots on now starting analysis…..
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Jpsi2e – selected plots0-10% 20-40% 40-80% 0-20% 20-40% 0-80%
Julian Book, PAG Meeting 09/01/12
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Jpsi2e – selected plots
Jens Wiechula, PAG Meeting 19/12/11
Julian Book, PAG Meeting 09/01/12
Background is clearly an issueSeveral methods to attack itTrack rotation, mixed events, fits (high pT), like sign ?
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Upsilon2mumu (J. Castillo, D. Das) Main items for 2012
Completion of work on pp 2011 Analysis rather advanced, PC in the next future ?
PbPb, 2011 data RAA (2S+3S)/ (1S) (a la CMS) Two centrality bins ?
Plots from ongoing analysis (pp and PbPb)…..
Alignment, fundamental issue Refine Boff alignment Use GMS in the reconstruction Move to Bon alignment
Crash programfor the next month
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Upsilon2mumu – selected plots
From J/ and /(J/)
Luminosity from trigger counters
Work still in progress butprospects are good
X. Lopez
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Upsilon2mumu – plots
Signal finally (well) visiblealso in PbPb
First try fitting with the variousresonances with relative yieldsas free parameters
A. Lardeux
R. Arnaldi
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Upsilon2mumu (alignment) – plotsChamber resolution(bending plane)Use of GMS does not bring the expectedimprovement
Design resolution100 m
Bias suspected in the Boff procedure. Now investigating
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Upsilon2mumu – plans
Manpower: 2 PhD, 2 postdoc FTE (+3 staff) Enough for pp, more people to join PbPb effort
pp results: analysis ongoing (look at LHC11e), aim for a paper in the next months RAA and resonance ratios: need better alignment and to work out a suitable pp reference (no 2.76 TeV)
MC productions: production with embedding. Could be done together with the J/ (depending on alignment timescales) Critical item: alignment !
Improvement of resolution to 120-130 MeV looks realistic (difficult to push to nominal 100 MeV value) Crash program organized (more news in ~1 month) Arrive in time for Pb-Pb pass3
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Conclusions
Activity starting in all the groups for the analysis of 2011 Pb (in addition to paper preparation and p-p issues)
Expect a wealth of new results already for Hard Probes
Some critical items are in our path, special attention (and manpower) on them