Logbook of Oliver Grünberg

2015

October

  • PAC reports: we can simulate 10M events using all Tier2 sites, average price = 6k€/10M events (Tuesday meeting, 27.10.)
  • Nobel Prize for Neutrinooscillation thumbs up (06.10.)
  • 145/pb recorded so far, 60% were recorded in the last two weeks (Run Chief Report, Tuesday meeting, 06.10.)

September

  • Muon Fake rate studies show negligible impact in 2011 data (bb cross section meeting 29.09.)
  • 0.1fb-1 recorded luminosity at 13TeV (SP news, Tuesday Meeting, 29.09.)
  • Stripping 23r1 implemented, my included Stripping Families: B23Mu, B24p, BLV, D23Mu, Lc23Mu (5/5), Validation sample available (RD Meeting, 23.09.)
  • new MC request policy: Check MC samples after 5-10% have been produced, buggy MC samples can be asked to be deleted (RD Meeting, 23.09.)
  • SP reports on plans for a "prize system" in LHCb, e.g. for thesis, like ATLAS and CMS already have (Tuesday Meeting, 08.09.)
    • many open questions, proposal for Collaboration Board anticipated at the end of the year
  • PAC reports on puzzling $ \Upsilon(nS) $ production in pp collisions at 7 and 8 TeV, overproportional increase of $ \sim 35\% $ (Tuesday Meeting, 08.09.)

77th LHCb Week: 14.-18.09. in Bologna

  • Monday:
    • M.P.Altarelli gives physics overview,
      • Milestones: $ B^{0}_{(s)} \to \mu\mu , B^{0} \to K^{*0}\mu\mu $
      • V(ub) from $ \Lambda_{b} \to p\mu\nu $ ,
      • Anomaly in $ R(D^{*}) = \frac{B(B\to D^{*+}\tau\nu)}{B(B\to D^{*+}\mu\nu)} $ and $ R(K) = \frac{B(B\to K\mu\mu)}{B(B\to Kee)} $
      • Measurement of Mixing parameter $ \phi_{s} $ in $ B_{s} \to J\psi \phi $
      • Measurement of CKM parameters (3 angles, 1 phase) $ \sin(2\beta) $ and $ \gamma $
      • Pentaquarks in $ \Lambda_{b} \to J\psi p K^{-} $
    • Run Coordinator report (P.Robbe)
      • So far: June+July 6pb-1 @ 50ns and large MB sample , August+September 25pb-1 @ 25ns
      • Planning: Stable running in October+November 200pb-1 @ 25ns
      • Run2: $ \mu = 1.1 $ (avrg. no. of vis. int. / bunch crossing) at 13TeV gives same multiplicity per event w.r.t. Run1, L0 @ 1MHz, 12.5 kHz (0.6GB/s) output rate
      • Some problems with bunch trains, 20% deadtime -> 5% in 2016-2018
      • Report on Alignment+Calibration and Data Quality Monitoring
      • 2016: Run from 21.03. - 11.12. with three weeks of technical stops
    • Data Processing (R.Aaij)
      • Run2: four Streams: Full stream, Turbo stream, Calibration stream, Technical stream
      • Calibration using Hlt1 output data, calibration per 1h run
      • additional HLT farm, HLT software ca. 40% faster
      • DQ moved to PIT, new presenter
  • Tuesday:
    • Online status (B.Jost)
      • Many new features implemented during LS1 run well
      • Problems: Hlt Farm Node stability, old hardware devices fail (disks)
    • Sci-Fi (U.Uwer)
      • Better quality of fibres, attenuation length reliably >= 350 cm
      • number of bumps (>300 µm) still too high, 20-40 per 12.5 km (= 1 spool), optimize bump cutting technique or increase fibre spacing
      • EDR review in July, "No particular show-stopper has been identified", proceed to Production Readiness Review (PRR)
      • Track resolution 80-90 µm
      • improved SiPM, Photon det. eff. ~47%, Xtalk ~4%
      • Test beams show expected performances, readout and cold box progress well
  • Wednesday:
    • Computing (S.Roiser)
      • Linear increase of CPU (20%), Disk (15%) and Tape (15%), as requested
      • 2015: 20PB disk and 40 PB tape

August

  • ~ 7 weeks of 25ns run in 2015 will provide $\approx 100pb^{-1}$, only 50% of expected intensity (RC news, Tuesday Meeting, 18.08.)
  • PPG news (PC news, Tuesday Meeting, 18.08.) :
    • never change preliminary results after first-time presentation
    • blinding is not required in general, discuss with WG convener

July

  • LHCb potentially discovers Pentaquark in decay $ \Lambda_{b} \to J\psi p K$ in $m(J\psi p) \approx 4450$ MeV (13.07., Inspire)
  • only 10% of expected data collected from 50ns ramp-up run (PC news, Tuesday Meeting, 21.07.)
  • Split HLT and TURBO stream for charm physics works fine (PC news, Tuesday Meeting, 21.07.)
  • PC presents publicity plots from early 2015 measurements LHCb2015PublicityPlots

June

May

April

  • MDST.DST will be replaced by normal Full.dst, makes it easier for flavour tagging etc. (A. Contu, email 20.04.)
  • Moritz Karbach died in climbing accident on April 11th frown ( Legacy book )

March

  • Stripping 20 will not be deleted, No. of copies will decrease 4 -> 2 (P. Charpentier, during LHCb week)
  • LHCb Run2: ~ June 2015 - end of 2018 (M.Gersabeck, DPG talk)
  • Public note on "LHCb Computing Resources: 2016 request and 2017 outlook" released: LHCb-PUB-2015-003
  • Strippinglines: changes to Phys/StrippingSelections package, dedicated subfolder for each WG, modified workflow (RD talk of P.R.Valls, 25.03.)
  • Restarting of LHC @ 13TeV with problems, short circuit in a main dipole, ~10 days delay link (28.03.)
  • 2014 Magnetic field measurements can/will improve measured mass Tuesday meeting talk, slide 18/22

-- OliverGruenberg - 2015-03-10

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