1. Federico Antinori Riunione di gruppo 24 giugno 2013
News from CERN
Federico Antinori
Riunione di gruppo
24 giugno 2013
FA - MB - 20 June 2013

2. ALICE Physics Week Grazie a tutti! a great success
the best ever, in my opinion
very positive feedback from across collaboration
Grazie a tutti!
FA - MB - 20 June 2013

3. pA update
quick summary (see talks presented at Physics Forum for more)
double ridge discovered by ALICE (& ATLAS) is now confirmed by CMS, too
jury still out about origin of long range correlations
id particle spectra reminiscent of flow
p/π, Λ/K0 (K/π, less pronounced) vs pT different from pp, similar to ~ 70% Pb-Pb
fair description by hydrodynamics models Bozek & Co, EPOS
id particle correlations
“central”-“peripheral”  v2
substantial Pb-Pb-like split between p and π, K in residual v2
<pT>
CGC-inspired scaling recently suggested by Mc Lerran et al, apparently violated
role of colour-reconnection?
FA - MB - 20 June 2013

4. pA update (cont’d) discrepancy with LHCb on J/ψ dσ/dy in p-Pb papers:
LHC prel < ALICE prel; ~ 20-30% in p-Pb, ~ 15-20% in Pb-p
contact with LHCb established at PC and PWG levels  regular meetings
confidential: new PID analysis by LHCb  cross-sections up
now agreement in Pb-p, but still some residual discrepancy in p-Pb
still reviewing the pp references
we intend to openly discuss our timeline to arXiv with LHCb colleagues
papers:
<pT>: to second round last week
id particle correlations: at first round
id particle spectra: first round this week
J/ψ: to first round next week
centrality: biases finally under control?
cross-check with W µ possible? pushing…
FA - MB - 20 June 2013

5. Summer approval session
~ 30 new results up for approval
SQM, EPS, …
previews last week
status globally good, but with a few “yellow” lights
poor attendance by MB members…
approvals in week 1/7
mostly “binary” (yes/no) iteration
FA - MB - 20 June 2013

6. Collaboration news Spokesperson: CB chair New coordinators:
Search Committee communicates only one available candidate (Paolo Giubellino)
CB chair
election in October
candidatures will be communicated at July CB
New coordinators:
PWG-HF: Ralf Averbeck (GSI) takes over from Philippe Crochet (Clermont-Ferrand)
PWG-PP: Cvetan Cheshkov (Lyon) takes over from Dariusz Miskowiec (GSI)
Run Coordinator: Federico Ronchetti (Frascati) from Gilda Scioli (Bologna)
Electronics Coordinator: Alex Kluge (CERN) from Luciano Musa (CERN)
Trigger Coordinator: Ken Oyama (Heidelberg) extended for the rest of 2013
Service Tasks:
from now on, every PhD student in ALICE must fulfill ST obligation (6 months EQ)
list of task from detector projects, PWGs, etc. available
FA - MB - 20 June 2013

7. New Institutes Full members: Associate members: New candidatures
NISER (Bhubaneswar, India) (Bedangadas Mohanty: Physics Analysis)
Inha University (Incheon, Korea) (Min Jung Kweon: ITS upgrade, Analysis)
Associate members:
Konkuk University (Korea) (Sunkun Oh: muons, Physics Analysis)
New candidatures
Liverpool University (Marielle Chartier: Physics Analysis)
LIPI (Indonesian Institute of Science) (GEM, computing)
Other Discussions:
Chinese, Austrian, German institutes
FA - MB - 20 June 2013

8. Discussions on Run 2 started discussion with LHCC on Run 2 strategy
current assumptions operating luminosities in ALICE:
Pb-Pb: 8 kHz (1027 cm-2 s-1)
pp (rare): 500 kHz ( cm-2 s-1)
pp (min bias): kHz ( cm-2 s-1)
p-Pb (rare): 200 kHz (1029 cm-2 s-1)
p-Pb (min bias): kHz ( cm-2 s-1)
other:
possibly, some pp running at corresponding Pb-Pb, p-Pb energy
25% stable beams
rare data taking: 20% DT
speed-up of TPC readout
p-Pb energy to be decided
FA - LHCC Referees - 11 June 2013

9. Main goals for Run 2 pp: p-Pb Pb-Pb: reach approved target of 1/nb
increase unbiased sample
pp:
reference sample for 1/nb Pb-Pb
increase reference unbiased sample
p-Pb
enlarge data sample (especially unbiased)
FA - LHCC Referees - 11 June 2013

10. Possible scenario pp Pb-Pb 8 weeks combined rare/min bias:
reach approved target of 1/nb for rare triggers
increase unbiased (centrality, min bias) sample
8 weeks combined rare/min bias:
~ 1/nb
~ 100 M central (x 3 current)
~ 100 M min bias (x 10 current) pp
reference rare trigger sample for 1/nb Pb-Pb
increase reference unbiased sample
48 weeks rare:
60/pb (1.5 equivalent int lumi of 1/nb Pb-Pb  not dominant in uncertainty)
24 weeks min bias
10 G events  better significance than Pb-Pb for D0
FA - LHCC Referees - 11 June 2013

11. Possible scenario (cont’d)
p-Pb:
enlarge data sample (especially unbiased)
precise unbiased/rare mix depending on results on 2013 data
e.g.: 4 weeks min bias
1 G events (x10 current)
would ~ match pp significance for D0
FA - LHCC Referees - 11 June 2013

12. Run 2 – Current Outlook Year System Luminosity 2015
pp – min bias (24 weeks)
cm-2s-1
Pb Pb – 4 weeks
1027 cm-2s-1 - leveled
2016
pp – rare triggers (24 weeks)
cm-2s-1
2017
p Pb – min bias (2 weeks)
cm-2s-1 - leveled
p Pb – rare triggers (2 weeks)
cm-2s-1 - leveled
2018
LS 2
N.B. the quality of ALICE PbPb measurements relies on accumulating the same nucleon-nucleon luminosity in pp-collisions at the same time
no other ions foreseen
FA - LHCC Referees - 11 June 2013

13. Upgrades General: Muon Forward Tracker:
discussions continuing with LHCC after endorsement of Central Barrel Upgrade
machine issues (pp running, dispersion suppressors, kicker magnet)
Muon Forward Tracker:
draft LOI received quite well by LHCC referees
submission delayed in order to incorporate referees’ comments
ECFA Workshop on LHC in the 2020s (1-3/10)
ALICE Fully Participating
Andrea Dainese in the Preparatory Group on Physics Goals
FA - MB - 20 June 2013