Laboratory of Instrumentation and Experimental Particle Physics Title
Laboratory of Instrumentation and Experimental Particle Physics Title Hadron Physics at LIP-Lisbon NA 38/NA 50, Delphi and COMPASS experiments Paula Bordalo LIP/IST 05 Novembre 2003 NUPECC, Lisbon Meeting, 12 November 2004 1
The Laboratory LIP – Instrumentation and Experimental Particle Physics Laboratory LIP is a FCT Associate Laboratory which congregates major portuguese experimental particle physicists Porto Coimbra Two Centres Figueira da Foz Coimbra (14 Ph. D + 20 students) : - detectors, analysis, databases Lisbon (20 Ph. D + 22 students) : - acquisition, trigger, analysis, - medical physics and simulations - astroparticles one pole at Faro (2 Ph. D + 4 students) silicium detectors and medical - applications ► ► Covilhã Lisbon Faro Many Collaborators 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 2
SPS LIP Experiments @ CERN NA 38 NA 50 Muon production from high energy heavy ion collisions at SPS NA 51 Study of the isospin symmetry breaking in the light quark sea of the nucleon from the Drell-Yan process LEP COMPASS Study of hadron structure and hadron spectroscopy with high intensity muon and hadron beams. DELPHI Study of electron-positron interactions at Large Electron LHC Positron Collider 12 Nov 2004 ATLAS Study of proton-proton interactions at the Large Hadron Collider CMS Study of proton-proton interactions at the Large Hadron Collider Paula Bordalo, NUPECC-Lisbon meting 3
Other LIP Experiments Hera-b CPLEAR AMS Large aperture high-rate spectrometer to measure CP-violation in B-meson decays Precision measurements of C, CPT-violation on the neutral K-system Alpha Magnetic Spectrometer for antimatter and darkmatter search and cosmic rays studies ESA Restec New simulation tools for environment radiation and for radiation effects ESA Geant 4 Development of Geant 4 simulations for the EUSO and AMS EUSO - Extreme Universe Space Observatory, aims to detect and analyse extreme energy cosmic rays Medical Physics Monte Carlo Simulation and Detectors for Creation of Clinical Images 12 Nov 2004 PET Development of Positron Emission Mammography Cosmic Rays Telescope This project aims to construct and explore a net of cosmic rays detectors installed in several high schools connect by the Internet Paula Bordalo, NUPECC-Lisbon meting 4
NA 38/NA 50 experiments Muon pairs and vector-meson production studies in high energy heavy ion collisions 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 5
NA 38 & NA 50 Goals LIP is involved, since the begining, at the CERN/SPS ultrarelativistic Heavy Ion Program To search Quark Gluon Plasma formation a new state of matter deconfined quarks and gluons 1986 -1992 first exploratory progam: NA 38 p-U, p-W, O-U and S-U collisions @ 200 Ge. V/nucleon 1994 -2000 second phase progam: NA 50 p-A, Pb-Pb interactions @ 450, 158 Ge. V/nucleon » NA 38 and NA 50 study pairs production, namely the J/y and y’ resonances 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 6
NA 38 & NA 50 Collaborations NA 38 is a collaboration of 3 countries and 8 laboratories NA 50 is a collaboration of 7 countries and 13 laboratories Orsay CERN Strasbourg Palaiseau Moscow Yerevan Clermont Lisbon Bucarest Torino Lyon Annecy Cagliari ~ 100 collaborators in NA 50 ~ 40 collaborators in NA 38 --- LIP ~ 10% --- LIP ~ 20% LIP responsibilities: - Data acquisition (full resp) - Trigger (shared with LLR) 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 7
LIP Group 4 Seniors in NA 50: 4 Ph. D Theses in NA 50 : Gonçalo Borges (05) Helena Santos Catarina Quintans Ruben Shahoian Luca Casagrande Sérgio Silva Conceição Abreu Paula Bordalo Sérgio Ramos 4 Engineers: Jorge Gomes António Almeida Paulo Gomes 4 Ph. D Theses in NA 38: 4 Master Theses: João Cruz Catarina Quintans Carla Vale Pedro Rato Mendes João Guimarães 12 Nov 2004 Carlos Lourenço Rui Ferreira Luís Peralta 4 8 Diploma Theses 4 6 Technical Students Paula Bordalo, NUPECC-Lisbon meting 8
NA 38 & NA 50 Spectrometer NA 50 NA 38 Calorímetro a 0º Hodoscópio P 2 detector de multiplicidade Sala de controlo Sala de trigger 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 9
Muon pair mass spectrum J/y , y’ , DY and DD shapes, generated by Monte Carlo and reconstructed as real data Combinatorial background, mostly coming from p and k decays, is extracted from measured like-sign pairs 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 10
J/y production results from p-p to Pb-Pb 4 Glauber fit performed for the 450/400/200 Ge. V p-A data gives sabs = 4. 1± 0. 4 mb and experimental rescaling factor from 450/400 to 200 Ge. V 4 Results from O, S light ions induced collisions lie on the extrapolated absorption curve The Pb-Pb J/y production result is significantly below the curve 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 11
J/y anomalous suppression In Pb-Pb collisions, J/y / DY as a function of ET exhibits a departure from the absorption curve at mid-centrality, followed by a steady decrease 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 12
First paper on q & g deconfinement observation 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 13
y’ suppression Huge y’ suppression which increases with centrality y’ is more suppressed than J/y by a factor of 2. 5 comparing central to peripheral collisions y’/DY 12 Nov 2004 y’/J/y Paula Bordalo, NUPECC-Lisbon meting 14
Charmonia Anomalous Suppression J/y/DY Charmonia yield measured over expected as a function of centrality Expected by the absorption model (Glauber ) with sabs obtained from p-A data: sabs = 4. 1± 0. 4 mb y’/DY J/y is abnormally suppressed in central Pb-Pb collisions is suppressed earlier than J/y y’ 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 15
f Enhancement Already in Sulphur induced reactions the f is enhanced 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 16
DELPHI Study of electron-positron interaction at LEP: QCD studies 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 17
Collaboration in DELPHI experiment The QCD subgroup (3 p. /12) RUN 117588, EVT 1128 (. . . but not the last!) RUN 323, EVT 517 (the first Z 0. . . ) Oc t 20 00 14 Aug 1989 . . . Z 0 qq- - Z 0 bb + - Pedro Abreu …on behalf of the LIP DELPHI/QCD group 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting July 2004 18
QCD activities in DELPHI (1996 -) 6 articles published in journals, of LIP responsability 16 Communications to International Conferences 11 Oral Presentations in International Conferences, on behalf of the DELPHI Collaboration 1 Ph. D. Thesis in Physics concluded, 1 Ph. D. Thesis in progress Co-Coordination of DELPHI - QCD/ Research Line • Charged particle multiplicities in Z & WW hadronic Decays • Studies in quark and gluon jets, in three jets Z events • Differences in multiplicities in b and light quark events • Colour Reconnection in WW Decays • Search for Pentaquarks in Z hadronic decays 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 19
COMPASS COMMON MUON and PROTON APPARATUS for STRUCTURE and SPECTROSCOPY 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 20
COMPASS Collaboration 12 Countries, 23 Labs, 230 Physicists (7 from LIP ) Bielefeld, Bochum, Bonn (ISKP & PI), Erlangen, Freiburg, Heidelberg, Mainz, München (LMU & TU) Dubna (LPP and LNP), Moscow (INR, LPI, State University), Protvino CERN Warsaw (SINS), Warsaw (TU) Helsinki Prag Nagoya Saclay Lisbon Torino(University, INFN), Burdwan, Calcutta L 20 IP 02 Trieste(University, INFN) Tel Aviv 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 21
Physics COMPASS goals nucleon spin structure Gluon Polarization G/G transverse spin structure function q. T(x) Flavour dependent polarized quark helicity densities q(x) spin dependent fragmentation functions D Diffractive VM production 12 Nov 2004 nucleon spectroscopy Primakoff reactions -polarizability of and K Exotic hadrons: -glueballs (gg) -hybrids (qqg) -pentaquarks (qqqqq) … charmed mesons and baryons -semi-leptonic decays -double-charmed baryons Paula Bordalo, NUPECC-Lisbon meting 22
COMPASS spectrometer Beam: 160 Ge. V µ+ 2. 108 µ/spill (4. 8 s/16. 2 s) P ~ 80% trigger-hodoscopes DW 45 SM 2 dipole RICH_1 straws Muon-filter 2, MW 2 HCAL 1 Gem_11 ECAL 2, HCAL 2 SM 1 dipole MWPC Gems Scifi Polarised Target SPS 160 Ge. V 2. 108 /spill Muon-filter 1, MW 1 Veto straws, MWPC, Gems, Sci. Fi Silicon BMS 12 Nov 2004 Sci. Fi Gems, Sci. Fi, DCs, straws Micromegas, DC, Sci. Fi Paula Bordalo, NUPECC-Lisbon meting 23
COMPASS detectors Straw m. W Inside RICH 1 Vessel GEM Drift 12 Nov 2004 Sci. Fi Paula Bordalo, NUPECC-Lisbon meting 24
COMPASS detector performances Detector Scintillating fibers Silicon Detectors Micro. Megas GEM detector Drift Chambers Straw tubes MWPC Coord 21 21 12 40 24 18 32 Efficiency 94% 98% 95 -98% 94 -97% > 90% 97 -99% Resolution 130 μm 9 μm 70 μm 50 μm 170 μm ~ 270 μm 2/(12)1/2 mm overall tracking effiency : 80 to 95 % Micro. Megas 12 Nov 2004 GEMs Drift. Chambers Paula Bordalo, NUPECC-Lisbon meting Straws 25
Detectors Control System DCS – full LIP responsibility 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 26
COMPASS acceptance Q 2 > 1 (Ge. Vc)2 Excellent for non-perturbative & perturbative physics - small x. Bj & very small Q 2 > 100 (Ge. V/c)2 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 27
Data taking 2002 - 2004 Muon beam Hadron beam 2002 2003 2004 Beam (1) (days) 70 83 106 19 Luminosity (cm-2) 1039 1. 2 x 1039 Events (x 109) 5. 8 8. 6 ~14 Tera. Bytes 200 300 >450 ~ 2. 4 x 1039 DATA ANALYSIS 2002: full data set analyzed 2003: data produced (1 st phase), preliminary analysis 2004: a small sample … (1) Scheduled beam excluding MDs and Experiment Setting up 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 28
COMPASS physics results • Longitudinal spin : G/G – from open charm G/G - Spin asymmetry from high p. T hadrons pairs inclusive A 1 d (Flavour decomposition of polarized PDF) • Transverse spin : Collins/Sivers asymmetry Λ & Λ hyperons, production and polarization (Vector meson production ρ, f and J/ψ). Exclusive r production 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 29
Summary The envolvement of LIP in Hadronic Physics is relevant: Ø Large participation in the Heavy Ion experiments NA 38 / NA 50 at CERN/SPS Ø Participation in the Delphi/LEP experiment Ø Participation in the COMPASS/SPS experiment 12 Nov 2004 Paula Bordalo, NUPECC-Lisbon meting 30
- Slides: 30