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Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>CMS</strong> detector <strong>First</strong> results<br />
<strong>from</strong> <strong>CMS</strong><br />
Piotr Zalewski<br />
IPJ Warsaw<br />
Warsaw, 15/01/2010<br />
1
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>First</strong> results <strong>from</strong> <strong>CMS</strong><br />
outline<br />
●<br />
<strong>CMS</strong> detector is fully operational<br />
●<br />
<strong>CMS</strong> 2008/2009: millions of cosmics data<br />
●<br />
<strong>CMS</strong> fall 2009: <strong>LHC</strong> is back<br />
●<br />
What we have seen in the first collisions?<br />
●<br />
Data – MC agreement<br />
●<br />
What we expect for 2010?<br />
●<br />
Conclusions<br />
Warsaw, 15/01/2010<br />
2
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>CMS</strong> detector<br />
Warsaw, 15/01/2010<br />
3
Cosmics data: Oct'08, Sep'09 with 3.8T<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
23 papers submitted to JINST<br />
slope ~ 20M/day ~ 200Hz<br />
Warsaw, 15/01/2010<br />
4
Piotr Zalewski<br />
IPJ Warsaw<br />
Beam splashes<br />
Saturday 7 November 2009<br />
Beam 2<br />
ECAL energy deposits in red, Preshower in green,<br />
HCAL energy deposits in blue (and light blue), RPC muon<br />
hits are in yellow, and CSC muon hits are in magenta.<br />
Warsaw, 15/01/2010<br />
5
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>First</strong> collisions!<br />
Circulating beams: 20/11/09<br />
<strong>First</strong> collisions: 23/11/09<br />
Warsaw, 15/01/2010<br />
6
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>First</strong> diphoton distributions<br />
27/11/2009<br />
π 0<br />
Warsaw, 15/01/2010<br />
7
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>First</strong> diphoton distributions<br />
η<br />
Warsaw, 15/01/2010<br />
8
Piotr Potr Zalewski<br />
IPJ Warsaw<br />
6/12/09: stable beams<br />
<strong>First</strong> results were shown next day!<br />
K S<br />
0<br />
Warsaw, 15/01/2010<br />
9
Piotr Potr Zalewski<br />
IPJ Warsaw<br />
6/12/09: stable beams<br />
<strong>First</strong> results were shown next day!<br />
Λ 0<br />
Warsaw, 15/01/2010<br />
10
Detector performance tracking *<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
Warsaw, 15/01/2010<br />
11
Piotr Zalewski<br />
IPJ Warsaw<br />
Charged hadron response<br />
Warsaw, 15/01/2010<br />
12
Dijet events: calorimeters<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
Data – MC<br />
agreement<br />
Warsaw, 15/01/2010<br />
13
Dijet events: jets+tracks<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
Data – MC<br />
agreement<br />
P.Flow jet composition<br />
Warsaw, 15/01/2010<br />
14
Piotr Zalewski<br />
IPJ Warsaw<br />
Colorimeter Missing ET<br />
Warsaw, 15/01/2010<br />
15
Particle Flow MET<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
Warsaw, 15/01/2010<br />
16
Piotr Zalewski<br />
IPJ Warsaw<br />
Electron candidate<br />
in the particle flow<br />
Warsaw, 15/01/2010<br />
17
Piotr Zalewski<br />
IPJ Warsaw<br />
dE/dx in slicon tracker<br />
particle identification<br />
Warsaw, 15/01/2010<br />
18
Piotr Zalewski<br />
IPJ Warsaw<br />
dE/dx in slicon tracker<br />
particle identification<br />
<strong>CMS</strong> 2009 Preliminary<br />
ϕ<br />
Warsaw, 15/01/2010<br />
19
14 December 2009: 2.36 TeV<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
multijet event<br />
Warsaw, 15/01/2010<br />
20
14 December 2009: 2.36 TeV<br />
Piotr Zalewski<br />
IPJ Warsaw<br />
multijet event<br />
Warsaw, 15/01/2010<br />
21
Piotr Zalewski<br />
IPJ Warsaw<br />
K 0 S<br />
candidate @ 2.36 TeV<br />
Warsaw, 15/01/2010<br />
22
Piotr Zalewski<br />
IPJ Warsaw<br />
Interesting dimuon candidate<br />
Warsaw, 15/01/2010<br />
23
Piotr Zalewski<br />
IPJ Warsaw<br />
Interesting dimuon candidate<br />
Warsaw, 15/01/2010<br />
24
Piotr Zalewski<br />
IPJ Warsaw<br />
<strong>LHC</strong> 2009/2010<br />
23/11/09: rate ~0.1Hz<br />
luminosity: few 10 24 cm 2 s 1<br />
after 10 7 s: ~100/ub<br />
December 09: rate ~10Hz<br />
luminosity: few 10 26 cm 2 s 1<br />
after 10 7 s: ~1/nb<br />
2010: rate ~10kHz (?)<br />
luminosity: ~10 31 cm 2 s 1 (?)<br />
after 10 7 s: ~100/pb (?)<br />
201?: rate ~40MHz<br />
luminosity: ~10 34 cm 2 s 1<br />
after 10 7 s: ~100/fb<br />
2010:<br />
~1M (W → l ν)<br />
~10k (ttbar)<br />
Upper star:<br />
Lower star:<br />
Warsaw, 15/01/2010<br />
xsec: rate= event/s<br />
xsec: rate= event/year<br />
25
Piotr Zalewski<br />
IPJ Warsaw<br />
Conclusions<br />
<strong>CMS</strong> is waiting for 2010 collisions.<br />
More than 99% of subdetector electronic channels are operational.<br />
Data can be analyzed rapidly, all analysis chains are working well.<br />
Detector is initially aligned and time callibrated.<br />
This situation will further improve with data.<br />
In 2010 we will rediscover Standard Model<br />
(1M leptonic W decays, 10k ttbar events).<br />
With only few tens of inverse picobarns of data at 3.5 TeV,<br />
<strong>CMS</strong> will start to be sensitive to new phenomena.<br />
Warsaw, 15/01/2010<br />
26
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