TOTEM PISA/SIENA Group

Presentazione sul tema: "TOTEM PISA/SIENA Group"— Transcript della presentazione:

1 TOTEM PISA/SIENA Group
The experiment at the LHC Prime Misure Attivita` di Pisa/Siena Composizione Gruppo Richieste 2012 Stefano Lami on behalf of the TOTEM PISA/SIENA Group

2 RP T1 T2 147 220 T1: 3.1 < |h| < 4.7 T2: 5.3 < |h| < 6.5
Stefano Lami

3 T2 Installato e operativo RP 147 /220 installate e operative
T1 installato shutdown 2010/11 e operativo RP 147 /220 installate e operative T1: 3.1 < |h| < 4.7 T2: 5.3 < |h| < 6.5 147 220 Stefano Lami

4 TOTEM complete and operational for 2011/12 dedicated runs

5 Scattering Elastico 2010: tracce protone nelle RP220 in diagonale (coincidenze left-right)
t = -p2 q2 x = Dp/p Sector 56 y = Ly Qy x = Lx Qx + x D Lx ~ 0 Sector 45

6 Selezione eventi Topology Low || selection (3σ)
near and far units diagonals Low || selection (3σ) |xRP,45|<3σx @ Lx,45=0 |xRP,56|<3σx @ Lx,56=0 corr. yRP216,45  yRP220,45 corr. yRP216,56  yRP220,56 Elastic collinearity (3σ) θx,45*  θx,56* θy,45*  θy,56* Integrated luminosity : 6.2 nb-1 Total triggers 5.28M Reconstructed tracks & elastic topology 293k Low || selection 70.2k Collinearity cuts 66.0k

7 Collinearita` Data outside the 3σ cuts used for background estimate
signal background signal Data outside the 3σ cuts used for background estimate

8 Distribuzione finale | Systematic normalisation uncertainty30%

9 Elastic Scattering – from ISR to Tevatron
~1.5 GeV2 ~ 0.7 GeV2 ~ 1.7 GeV2 ISR Tevatron

10 Comparison to some models
B (t=-0.4 GeV2) tDIP t-n [1.5–2.5 GeV2] 20.2 0.60 5.0 23.3 0.51 7.0 22.0 0.54 8.4 25.3 0.48 10.4 20.1 0.72 4.2 23.6 ± 0.5 0.53 ± 0.01 7.8 ± 0.3 Better statistics at large t needed

11 Future analyses of existing data
RP – 18 s 2010 data (5.8 pb-1) – Double Pomeron Exchange, RP +T1 and T2 (2011 data from 6 low L pilots) 2. Inelastic detectors T1 and T2 (data from 2011) – Pseudorapidity distributions (including RP information) – Multiplicity distributions and correlations Future runs 2011 RP 220 m fully validated (14 s vert., 17 s horiz. in normal runs): large-t elastic scattering, β*=1.5 m RP 147 m beam based alignment with data taking (August) : diffraction β* = 90 m optics – First MD (done): successful for separated beams – Next MD (28. June): establish collisions and ~1hour data taking for optics diagnostics – Physics starting in August / September Low-t (10 -2 GeV2) elastic scattering Total cross-section (extrapolation to t=0 possible)

12 Contributo TOTEM Pisa/Siena
Progetto e realizzazione Elettronica T2 Responsabilita` Trigger L1 Ricerca e sviluppo tecnologia dei rivelatori Installazione e messa a punto T2 Sviluppo Algoritmi di Ricostruzione

13 Commissioning, allineamento, analisi dati di T2
2011 Raw data Very good agreement: - left and right side - bunch and active trigger Pythia PhoJet Unfolded Green band after vertex cuts Low luminosity runs 2010 ‘Plus’ and ‘minus’ T2 sides superimposed - Bunch crossing trigger - T2 detector trigger Taken during scraping exercise only low intensity bunches of 1010 p (low pile-up)

14 Richieste INFN per servizi locali
Nessuna richiesta per Officina Meccanica Minimo supporto per manutenzione Elettronica sviluppata a Pisa/Siena, update Firmware. Laboratorio Alte Tecnologie: Possibile bondaggio dei rimanenti ibridi, ~ 1 settimana lavoro.

15 Composizione Gruppo 9.2 FTE Berretti 100 Dottorando Bossini Bottigli
20 P.O. Greco Lami 50 Primo Ricercatore Latino 70 Assegnista Meucci 40 Oliveri Palmonari 30 Sanguinetti Pensionato Scribano 80 Turini Ricercatore Universitario Pedreschi Tecnologo Cecchi 9.2 FTE (in linea con gli anni scorsi)

16 Preventivo di spesa 2012 Capitolo Descrizione Richiesta Totale INTERNO
Contatti Pi-Ge-Ba-Referee 11 ESTERO Riunioni al CERN (4MU) 16 Responsabilita` Chairman CB (2MU) 8 Responsabilita` Trigger (6MU) 24 TB GEM (RD51) (2MU) Run (20MU) 80 136 CONSUMI Metabolismo in sede e al CERN 7 Mantenimento Lab Siena 5 Percentuale MOF 2012 Cat.A 164 MOF 2012 Cat. B 98 274 APPARATI Prototipi miglioramento T2 (da dettagliare) 20 TOTALE TOTEM Pisa Keuro 441

17 Backup Stefano Lami

18 Preliminary dN/dh results (T1)
3 short periods of data taking with useful conditions for T1 (L = 1028 – 1030 cm–2 s–1): March (2.76 TeV), May (7 TeV) 25 million events collected with different configurations Data analysis in progress T1 ready for physics h Distributions (uncorrected) Vertexreconstruction 7 TeV Vertex reconstruction is effected by the CMS magnetic field Symmetric distributions obtained – a good starting point

19 Proton reconstruction
Both angle projections reconstructed: Θx* and Θy* Θx* from RP220 (through dLx/ds) Θx = dLx/ds Θx* Θy* from RP220 (through Ly) y = Ly Θy* → Excellent optics understanding Magnet currents measured Measurements of optics parameters with elastic scatt. Θleft* = Θright* (proton pair collinearity) Proton position ↔ angle correlations Lx=0 determination, coupling corrections → Fine alignment Alignment between pots with overlapping tracks (1μm) Alignment with respect to the beam – scraping exercise (20μm) Mechanical constraints between top and bottom pots (10μm) Track based alignment

20 Background and resolution determination
–– signal –– backgrnd –– combined B/S =(8±1)% σ*=17.8rad (beam divergence) Data Combined background (t) -t [GeV2] θx/sqrt(2) Signal to background normalisation Signal vs. background (t) (also as a function of θy) σ* → t-reconstruction resolution: |t|=0.4GeV2: B/S = (11±2)% |t|=0.5GeV2: B/S = (19±3)% |t|=1.5GeV2: B/S = (0.8±0.3)%

21 ty-acceptance corrections
Missing acceptance in θy* Beam divergence |ty| (diagonal 2) |ty| (diagonal 1) |t|<0.36GeV2 removed Correction error (ty): 0.31 GeV2 : 30% 0.33 GeV2 : 11% 0.35 GeV2 : 2% 0.4 GeV2 : 0.8% 0.5 GeV2 : 0.1%

22 -acceptance correction
Total -acceptance correction Accepted (t) Diagonal 1 Diagonal 2 Θ*  No. t [GeV2] Θ* [rad] Accepted  (2 diag.) [°]  accept. correct. factor 1 0.33 1.65E-04 38.6 9.3±4.7% 2 0.36 1.71E-04 76.4 4.7±1.8% 3 0.60 2.21E-04 162.5 2.2±0.3% 4 1.00 2.86E-04 209.8 1.7±0.1% 5 1.80 3.83E-04 246.3 1.5 6 3.00 4.95E-04 269.0 1.3 |t|<0.36GeV2 removed Critical at low t-acceptance limit