ALICE UPGRADE 06 June 2012 LHCC Meeting K

ALICE UPGRADE 06 June 2012 LHCC Meeting K. Safarik 1

Physics Motivation l There are two main physics issues we propose to address which are uniquely accessible (among others) by upgraded ALICE detector: ð Measurement of heavy-flavour transport parameters – separately for charm and beauty – µ diffusion coefficients via azimuthal asymmetry µ energy loss via RAA gives access to understanding of the nature of matter created in heavy-ion collisions and its equation of state ð Measurement of direct real and virtual gammas µ QGP radiation – temperature µ vector-meson spectral function – we will verify, using the QCD sum rules, lattice QCD predictions at zero baryon density on disappearance of the vacuum condensate – restoration of chiral symmetry and generation of hadron masses 06 June 2012 LHCC Meeting K. Safarik 2

Heavy-flavour measurements l Yields of D-mesons (incl. Ds), Lc, Xc, B-mesons, Lb ð in medium hadronization of heavy-flavours ð heavy-flavour radial flow l Elliptic flow of D and B ð thermalization of heavy-flavour quarks ð coupling strength to the medium ð viscosity-to-entropy ratio l Transverse momentum spectra – RAA ð transition from diffusion to energy-loss regime ð quark vs. gluon energy loss ð collisional vs. radiative energy loss l Better under control than light-quark sector 06 June 2012 LHCC Meeting K. Safarik 3

Charmonium measurement l J/y , y’, and cc states down to low (zero) transverse momentum ð yields and transverse momentum spectra – RAA ð statistical hadronization vs. dissociation/recombination scenario ð transition between low and high transverse momenta ð density dependence – central vs. forward production l elliptic flow ð heavy-quark diffusion coefficient 06 June 2012 LHCC Meeting K. Safarik 4

Dilepton measurement l yield of low-mass e+e- (virtual g) ð by extrapolation yield of direct real g ð temperature at different stages ð integrated according the mass window ð disentangle space-time evolution ð contribution from cc pair – complementary measurement to HF l spectral function of r-meson – e+e- effective mass spectrum down to 200 Me. V ð from QCD sum rules axial-vector part ð compare to lattice QCD calculations, where the modification of spectral function is caused by disappearance of vacuum condensate ð observation of chiral-symmetry restoration 06 June 2012 LHCC Meeting K. Safarik 5

Additional measurements l Jets ð Heavy-flavour tagged jets µ detail comparison gluon vs. quark induced jets µ heavy-flavour produced in fragmentation ð Particle identified fragmentation functions µ influence of media on fragmentations, µ particle composition ð g – jet correlations µ jet energy recuperation at very low energies l Heavy-nuclear states ð mass-4 and -5 (anti-)hypernuclei ð search for H-dibaryon, Ln bound state, etc. 06 June 2012 LHCC Meeting K. Safarik 6

Observables Heavy-flavours Charmonia D 0 advanced, systematic errors Lc systematic under study Ds, Xc, B->Dp, Lb simulated, analysis started y’ estimate for ee, mm started cc to be done Dileptons Jets Heavy-nuclear states preliminary S/B and significance c, b – tag to be done PID fragmentation started g – jet started to be done 06 June 2012 LHCC Meeting K. Safarik 7

l Representatives WG with Atlas and CMS ð Atlas: Peter Steinberg ð CMS: Raphael Granier de Cassagnac, Gunther Roland ð Alice: Lo. I editorial board l Meetings ð May 9 th – we informed our colleagues about Alice Upgrade Intentions https: //indico. cern. ch/conference. Display. py? conf. Id=190561 ð May 25 th – we listen first reaction from Atlas and CMS https: //indico. cern. ch/conference. Display. py? conf. Id=192476 l What we learned: ð CMS: rate to storage manager and pixel limit few k. Hz (L 1), to tape few 100 Hz (HLT) ð CMS: jets down to 25 Ge. V, maybe lower, 85% of missing energy pt > 0. 5 Ge. V (tracking down to 0. 3 Ge. V), jet study w. r. t. reaction plane, b jets > 50 Ge. V, g, Z, W – jet (up to 120 Ge. V), multi-jet correlations ð CMS: lower cut-off for muons 3 -4 Ge. V, forward 2 Ge. V, but lowering B field may help ð CMS: p, K, p PID up to 1 Ge. V, strange up to 10 Ge. V, D mesons tbd ð Atlas: similar constrains as CMS, rate to HLT 3 k. Hz, to tape O(500 Hz) ð Atlas: jet, concentrate on high Et, g, Z – jet, tracking down to 0. 5 Ge. V ð Atlas: low-mass dileptons difficult, electron ID not extended to low pt yet ð Atlas: PID limited to low momentum region, muons limited as in CMS l Agreed to try comparison on performance figures (momentum, impact) 06 June 2012 LHCC Meeting K. Safarik 8

ALICE upgrade Lo. I l Physics motivation for running ALICE beyond LS 2, with ð running at 50 k. HZ for Pb. Pb collisions collecting 10 nb-1 or above (and 2 MHz for pp collisions) ð continuous readout, inspecting all heavy-ion collisions l Feasibility to achieve presented physics goals by ð upgrading of central barrel detectors (ITS and TPC) and of readout electronics of other detectors ð upgrading of Trigger, HLT and DAQ systems, and offline computing l Three possible extensions of ALICE under study, will be considered by collaboration in September ð VHMPID (to improve PID at higher momenta – identified RAA and jet fragmentation function) ð Muon Forward Tracker (MFT) (complement low-mass dileptons in mm channel, bproduction in forward region, lower background for J/y and y’) ð Forward Calorimeter (Fo. Cal) (study of very low-x region, colour-glass condensate) 06 June 2012 LHCC Meeting K. Safarik 9

Letter of Intent outline o Introduction (K. Safarik, P. Braun-Munzinger, P. Jacobs, L. Musa) o Physics Motivations • Heavy flavour (A. Dainese, G. Usai) • Quarkonia (A. Andronic) • Low mass dileptons (H. Appelshaeuser) • Jet physics (A. Morsch, M. Van Leeuwen, K. Klein-Boesing) • Heavy Nuclear States (P. Braun-Munzinger) - advanced draft - draft of phys motivation o Detectors and Readout Electronics Upgrade (W. Riegler, L. Musa) draft • ITS, TPC Readout Plane, Electronics of TPC, TRD, TOF, EMCal, PHOS and Muons o DAQ, HLT & Offline (P. Vande Vyvre, T. Kollegger, F. Carminati) • - advanced draft Data processing, Data compression, Computing & Netowrking o Cost estimate, Resources, Schedule, Organization (W. Riegler, P. Vande Vyvre, L. Musa) 06 June 2012 LHCC Meeting K. Safarik 10