LHCb status Raluca Mureşan EPFL p.1/20
Disclaimer too many things going on 8 meetings to attend per week, days with over 100 e-mails very dinamic evolution - the most of the plots shown in a meeting are alreay outdated deeply involved (150% of my working time) in the first data analysis not clear if to show or not own work Appologies in advance for a rather biased (analysis based), incomplete, outdated presentation. More about physics analysis than about hardware... p.2/20
LHCb 730 members 15 countries 54 institutes 17 February 2010 LHCC open session Andreas Schopper 1 R. Mures an LHCb status p.3/20
LHCb detector y Dedicated b-physics experiment: CP violation and rare decays 5m Vertex Locator TT Magnet T1 T2T3 RICH2 ECAL SPD/PS M1 HCAL M2 M3 M4 M5 Forward single arm spectrometer - large and correlated b b quark production in the forward region. 5m 10m 15m 20m z Coverage: 15-300(250) mrad p.4/20
LHCb detector y 5m Magnet RICH2 ECAL SPD/PS M1 HCAL M2 M3 M4 M5 T1 T2T3 Vertex Locator TT 5m 10m 15m 20m z p.4/20
What happened... Steve Myers @ 100th LHCC meeting p.5/20
What happened... Date recorded ~6 µb -1 of integrated luminosity with Minimum Bias trigger (L0: HCAL&SPD -OR- muon -OR- backward VELO planes ) total of ~260 10 3 pp-collision events at 450 GeV (beam gas subtracted) with all detectors ON and VELO powered (stable beams!) Number of crossing On disk Number of beam-beam crossing On disk Number of beam1-gas crossing On disk Number of beam2-gas crossing On disk Estimated Number of pp interaction on disk pp interaction / (bbcrossing) Estimated L0 rate (t=0) L0 rate (t=0) pp interaction rate (t=0) [Hz] beam1-gas crossing [Hz] beam2-gas crossing [Hz] Recorded luminosity [ b -1 ] Dec 6, 09 994 606 164 278 45.9% 0.5 0.2 0.01 Dec 6, 09 7 762 5 506 889 3 728 67.7% 0.9 0.2 0.09 Dec 8, 09 16 220 11 449 4 298 7 151 62.5% 0.8 0.5 0.18 Dec 9, 09 3 227 2 155 408 1 339 62.1% 0.5 0.1 0.03 Dec 11, 09 75 511 55 478 14 975 48 40 503 73.0% 5.1 1.6 0.01 1.01 Dec 11, 09 2 070 1 424 382 30 1 042 73.2% 2.0 0.8 0.06 0.03 Dec 12, 09 88 819 62 772 17 831 963 44 941 71.6% 6.3 1.7 0.11 1.12 Dec 12, 09 92 776 62 644 20 417 1 301 42 227 67.4% 5.3 1.8 0.14 1.06 Dec 12, 09 84 759 69 889 9 952 878 59 937 85.8% 12.7 1.9 0.17 1.50 Dec 15, 09 23 670 19 581 3 294 2 15 816 80.8% 22.3 4.7 0.01 0.40 Dec 15, 09 63 103 50 412 8 985 597 40 143 79.6% 20.6 4.4 0.28 1.00 458 911 341 916 81 595 3 819 257 105 6. 4 17 February 2010 LHCC open session Andreas Schopper 3 p.6/20
What happened.. We run with VELO partially open Commissioning of LHC detector and trigger done in parallel = not so easy to get physics results. p.7/20
A glimpse to the first data K s and Λ 450 GeV/beam m π + π (LHCb 2009 data, preliminary) - m p +/- -/+ π (LHCb 2009 data, preliminary) candidates/2 MeV 300 250 200 Integral 2510 2 χ / ndf 101.41 / 64 Prob 0.0020102 constant 19.06 ± 1.41 slope -0.027018 ± 0.002655 N signal 1329.7 ± 41.3 m 496.86 ± 0.14 narr σ m 4.1479 ± 0.1311 candidates/1 MeV 160 140 120 100 Integral 2504 2 χ / ndf 112.75 / 82 Prob 0.013755 constant -295.3 ± 15.2 slope 0.27991 ± 0.01366 N signal 411.39 ± 25.96 m 1115.7 ± 0.1 narr σ m 1.4381 ± 0.1143 150 80 DATA 100 50 0 400 420 440 460 480 500 520 540 560 580 [MeV] K s m π + π (LHCb 2009 MC, preliminary) - m π + - π 60 40 20 m p +/- -/+ π 0 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 [MeV] Λ (LHCb 2009 MC, preliminary) m +/- p -/+ π candidates/2 MeV 140 120 100 80 Integral 825 χ 2 / ndf 32.968 / 27 Prob 0.19811 constant 3.5792 ± 0.7346 slope -0.0047345 ± 0.0014286 N signal 596.83 ± 25.29 m 497.83 ± 0.16 σ narr m 3.5862 ± 0.1322 candidates/1 MeV 40 35 30 25 20 Integral 572 2 χ / ndf 41.295 / 38 Prob 0.32869 constant -105.23 ± 4.23 slope 0.097813 ± 0.003855 N signal 82.579 ± 11.049 m 1115.7 ± 0.2 narr σ m 1.2398 ± 0.1771 60 15 40 10 MC 20 0 400 420 440 460 480 500 520 540 560 580 [MeV] m π + - π 5 0 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 [MeV] m +/- p -/+ π p.8/20
A glimpse to the first data π 0 and η p.9/20
A glimpse to the first data Φ and RICH no PID PID p.10/20
Physics @ LHCb 2009 Unique rapidity range (2<η<5), unique energy. Important input for tuning Monte Carlo. Topics pursued: Charged track multiplicities and p t η distributions Measurements of K s and Λ cross sections as function of p t and η Ratio of strange meson over strange baryon production Ratio of Λ over Λ production p.11/20
Pseudorapidity range Studies of the inclusive distributions at LHCb particularly interesting because of the unique rapidity range coverage. ATLAS CMS+TOTEM ALICE LHCb tracking, ECAL, HCAL, counters lumi, muon, hadron PID Pictures from Tara Shears talk: http://indico.cern.ch/conferencedisplay.py?confid=37654 p.12/20
Why V 0 studies @ LHCb 2009? Strange particles - enough statistics to make a study using the 2009 data if we define our problem properly. Understanding and calibrating our detector Tracking studies, RICH calibration, even more important: a complete analysis exercise giving an insight of what one needs for a successful analysis MC tuning and validation Compare the distributions we see in data and MC, few V 0 distributions can be used to discriminate between generator models. Stepping stone towards reconstruction of interesting charm and beauty hadrons that have as daughters K S, Λ,..., in particular for charm and beauty baryon studies (Λ) beauty baryons out of reach for the b-factories. QCD physics studies p.13/20
Models disagree wildly. Don t listen to them N( 1.4 1.2 (Still, can be used to gauge 0.8 possible size of effect) 0.6 0 bar)/n( 0 ) 1 900 GeV p+p Inelastic, Non-Diffractive 0 bar / 0 Distribution (generator-level) Perugia 0 Perugia HARD Perugia SOFT Perugia NOCR DW Pythia 6.422-4 -2 0 2 4 Wednesday, January 27, 2010 http://indico.cern.ch/materialdisplay.py?contribid=9&sessionid=1&materialid=slides&confid=78771 p.14/20
Why V 0 studies @ LHCb 2009? The low-energy LHC runs give us a unique chance to fill in the gaps in our knowledge at lower energies Highest energy pp data RHIC 200 GeV How about Tevatron? -> central detector η < 1, p p N(Λ 0 bar)/n(λ 0 ) 1.4 1.2 1800 GeV p+pbar Inelastic, Non-Diffractive Λ 0 bar / Λ 0 η Distribution (generator-level) Perugia 0 Perugia HARD Perugia SOFT Perugia 3 Perugia NOCR Perugia LO* Perugia 6 N(Λ 0 bar)/n(λ 0 ) 1.15 1.1 1.05 1800 GeV p+pbar Inelastic, Non-Diffractive Λ 0 bar / Λ 0 η Distribution ( η <1.0, p >0.4GeV) Perugia 0 Perugia HARD Perugia SOFT Perugia 3 Perugia NOCR Perugia LO* Perugia 6 CDF 1 1 Pythia 6.421 Pythia 6.421 0.8-4 -2 0 2 4 η 0.95-1 -0.5 0 0.5 1 η http://home.fnal.gov/ skands/leshouches-plots p.15/20
What else? detector preparation for the 2010 run tracking and alignment improvement (Reco 8) on the way MC tuning - cross-experiment effort Already 24/24 h, 7/7 days shifts: cosmics also TED run at the end of the last week. Collisions at 3.5 TeV still forseen around mid-march. p.16/20
LHC plans Two possible scenarios: Run at 3.5 TeV/beam up to a defined integrated luminosity with a day limit, afterwords consolidate the whole machine for the 7 TeV run minimum risk; more efficient over the LHC lifetime. run until second half of 2010 then do minimum repair to allow 5 TeV/beam in 2011 (7 TeV much later) higher risk; reduce running in 2010, long shutdown 2010-2011, delays operation at higher energy. Will go for scenario 1 p.17/20
Scenario A: sort splices out in one go Two years at 3.5 TeV 2010: should peak at 10 32 and yield up to 0.5 fb -1 2011: ~1 fb -1 at 3.5 TeV 2012: splice consolidation (and cryo collimator prep.) 2013: 6.5 TeV - 25% nominal intensity 2014: 7 TeV 50% nominal intensity Aggressive Year Months energy beta ib nb Peak Lumi Lumi per month Int Lumi Year Int Lumi Cul 2010 8 3.5 2.5 7 e10 720 1.2 e32-0.5 0.5 2011 8 3.5 2.5 7 e10 720 1.2 e32 0.1 0.8 1.3 2012 2013 6 6.5 1 1.1 e11 720 1.4 e33 1.1 7 8 2014 7 7 1 1.1 e11 1404 3.0 e33 2.3 16 24 29/01/10 LHC luminosity estimates 66 p.18/20
Physics in 2010 With L > 200 pb -1, expect to make significant contributions in all channels of our physics program, with particularly exciting possibilities in: B s µ + µ - B s J/ B 0 K*µ + µ - charm physics Keys for success High precision tracking close to the production vertex Muon identification and K/ separation over a large momentum range High selective trigger, efficient and flexible With 2009 data, started to exercise the analysis methods and investigate performances. As an example: B S µ + µ Thomas Ruf LHCb Status Report 100 th LHC Session 17/02/2010 23 p.19/20
Summary 2009 detector performance in many areas already in good agreement with MC expectations. Expect to see improvements with new detector alignments Prospects for interesting physics results with 2009 data Waiting eagerly for 3.5 TeV to be able to close Velo and have final detector configuration. Looking forward to the 2010 run physics results. p.20/20