15 December 2008 Pd meeting 1

News/”highlights” dalla CMSweek

( con qualche dettaglio su analisi dei CRAFT data )

U.Gasparini

15 December 2008 Pd meeting 2

LHC & CMSLHC, Evans

CMS, Verdee

“on track”,ma con molte cose da fare…

“CRAFT”

15 December 2008 Pd meeting 3

CMS(II)

15 December 2008 Pd meeting 4

Detectors & Physics

15 December 2008 Pd meeting 5

CRAFT

15 December 2008 Pd meeting 6

Data vs MC…

All plotsnormalized toNr. of events passingpre-selection

Pre-selection:at least 2 “good” DT segmentsboth in upper &lower sectors

~4.1%of events withless than 2 STA mu(3.7% in MC)

15 December 2008 Pd meeting 7

Tracker Efficiency StudiesTracker Efficiency Studies

Efficiency is around 90%not yet the optimal value compared to pp (simulation)

1) Eff. vs pt of the STA muons

(|d0| < 50 cm and |dz| < 50 cm)

2) Eff. vs d0 for STA muons

(pt > 12 GeV and |dz| < 50 cm)

J.Andrea/ULPCombinedTrack Finder

Road Search

CosmicTrack Finder

to beunderstood…

15 December 2008 Pd meeting 8

Timing/TOF/HSCP searches

15 December 2008 Pd meeting 9

we could expect resolutions: cosmic global > 1-leg > 2-leg > lhcSTA*

CosmicMCBon10GeV GEN-SIM-RAW sample, reconstruction in 2_1_12

Pt resolution defined as:(1/pT

reco-1/pTsim)/(1/pT

sim) comparing the innermost state and its closet primary muon simhit

Pt resolution: MC expectationsPt resolution: MC expectations

15 December 2008 Pd meeting 10

Momentum scale: 1-leg STA vs Tracker trackMomentum scale: 1-leg STA vs Tracker track

[1/pt(1legSTA) -1/pT(Tracker) ] / (1/pt(Tk)

~ 0

~ -12%

-0.5 0.5 0.5-0.5

Underinvestigation…requiresdetailedstudies(B fieldeffects?see nextslides)

=22.2%=22.7 %

resolutionsas expected

-0.5 0.5 0.5-0.5

15 December 2008 Pd meeting 11

upperupper STA-leg vs Tracker track STA-leg vs Tracker track

STA upper leg

Trackertrack

[1/pt(1legSTA) -1/pT(Tk) ] / (1/pt(Tk)

~ -20% ~ -2%

15 December 2008 Pd meeting 12

lowerlower STA-leg vs Tracker track STA-leg vs Tracker track

STA lower leg

Trackertrack

15 December 2008 Pd meeting 13

Momentum scale: back to DT segmentsMomentum scale: back to DT segments

Bending angledifference betweensegments inconsecutive stations

B field in theoutermost parts ofIron Yokesseems to belower (~30%effect)than the current mapping value

mean = -15.7± 0.1 mrad mean = -21.6±

0.1 mrad

mean = -19.0± 0.1 mrad

mean = -13.5± 0.1 mrad

mean = -14.2± 0.1 mrad

mean = -13.4± 0.1 mrad

B= 3.8 T

15 December 2008 Pd meeting 14

Momentum scale (II)Momentum scale (II)

Width ofdistributioncompatible with mult.scattering as observed in B=0 data

B= 0 B= 3.8 T

=5.7 mrad =5.4 mrad

mean=-8.9± 0.1 mrad

mean=-8.2± 0.1 mrad

mean=-11.7± 0.1 mrad

mean=-12.5± 0.1 mrad

mean= 0.3 ± 0.1 mrad

mean= 0.4 ± 0.1 mrad

mean= -0.9 ± 0.1 mrad

misalignm.effects < 1 mrad

mean=-8.6± 0.1 mrad

mean=-7.6± 0.1 mrad

15 December 2008 Pd meeting 15

Energy LossEnergy Loss N.Kypreos/UFL

Some features in the distributions, some of them understood other need to be studied

15 December 2008 Pd meeting 16

• dE (inner E – outer E) vs. dx Distance (inner, outer)– MC/Data shape agree very well– Clear dependence on the path of

track– Steps on the curve are because

energy loss is less in muon chamber than in iron

• dE/dx as a function of energy @ innermost– Similar curve as HCAL energy-loss vs.

muon energy (by Jordan D. & Efe Y.)– Material is more complicated

• Whole detector: air, iron, calorimeters, tracker & muon chambers…

– MC/Data agrees well at low-energy region

Energy Loss (II)Energy Loss (II)

C.Liu/Purdue

15 December 2008 Pd meeting 17

YB+2 SA 2 legs @ IPNominalCRAFT_All_V3

Z @ IPZ @ IP Phi @ IPPhi @ IP

Pt(upper)- Pt (down) / Pt (down) Pt(upper)- Pt (down) / Pt (down)

Theta @ IPTheta @ IP

From 2.3 mm From 1.2 mrad up to 0.6 mrad

From 2 mradup to 0.9 mrad

up to 1.6 mm

Alignment effectsAlignment effectsInclusion of muon alignment data slightly improve STA reconstruction:

A.Calderon

15 December 2008 Pd meeting 18

3.8 T

CMSSW map (B(solenoid)=3.8): 1.640 T 1.620 T 1.740 T

IEEE-NSS-2008_PID771926

15 December 2008 Pd meeting 19

Bfield from data

1

2

r sin 1

r sin 2

= r (sin2 – sin1)

B = pT/ (0.003 r)

from tracker + energy loss

= 29 cm

=62 cm

= 62 cm

r

15 December 2008 Pd meeting 20

B field from data…B field from data…

??

CMSSW map (B(solenoid)=3.8): 1.640 T 1.620 T 1.740 T

B=1.44±.01

B=1.85±.01

B=1.48±.01

B=0.97±.02

B=1.96±.03

B=1.02±.02

issuemu+ vs mu-to be undesrtood…

15 December 2008 Pd meeting 21

B field from data (II)

15 December 2008 Pd meeting 22

B field from data (III)

??

15 December 2008 Pd meeting 23

Conclusioni…Conclusioni…

Stiamo (velocemente?) avvicinandoci alla partenza di LHC…un sacco di lavoro da fare per capire i dati nel 2009…

p.s.: se qualcuno ha da prestarmi qualche punto della patente (diciamo una decina…) gli offro una cena…