Saclay at D0 (run I) : the origins
– 1983 : Armand Zylberstejn is already in the US, on the K 0 experiment with Jim Cronin
Yves Ducros works on Cello in Desy
Armand meets Paul Grannis, Yves meets Bernie Pope.
– 1984 : Decide participation of Saclay to D0, to make the Transition Radiation Detector
• Meeting at MSU
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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The infancy
– Review Committee : Armand convinces his audience by showing the telex
« Accepted by CEA » from Saclay director M Banner… And it is real!
– We (AZ, YD, BM, J Teiger…) start to discover all about TRD.
• Rather fascinating:: multi-foil interference, imperfect radiators,
– Prototypes at Cern: test different radiators (Li, polypropylene foils and fibers)
The analysis of these tests will be the first Thesis in D0 : Fabrice Feinstein
– Design of the 3 layer TRD for D0, beginning of construction 1986
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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Growing up is not always easy
• Seen from Saclay, the beginning of D0 was not always easy and peaceful….
– Delays for the first run : sometime in ‘87 or ’88, AZ and YD send a telex to D0 ,
« Saclay : ‘89 or bust! »
• …the first run took place in ’92…and we did not bust, wisely!
– But from time to time, we would hear a rumor that « D0 will never fly » !!!
Then at the next collaboration meeting we found the collaboration
working like ~usual… rather strange…
• But we keep constructing the detector
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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Grown-up TRD
• The detector is finished…
• We test it thoroughly on a beam at Cern
– For this we need Xenon…
We quickly discover that a USSR group sells black-market Xenon.
We hide the bottles with Xenon in Cyrillic characters.
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
Ксенон
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Data, anyone?
• The TRD is shipped to Fnal in ’88.
It will remain as delivered for almost a year…
then it gets inserted
• During this time, we get into the D0 software.
At that era, the fashion is SASD.
As others, we do our best to make bubbles…
• But Armand cannot keep quiet and refrain from acting…
quickly he gets sanctionned: forbidden from touching the D0 library…
(but even now he claims « I did not do it »)
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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Data, at last
• First run 1992 !!
• We struggle with electronics , coherent noise, oscillations…
• True enough, we now know that M(top) > M(W) , which makes the TRD less central to the top
analysis. Where it is needed (low pt electrons), b-jets are narrow, and the TRD gets easily crowded…
• But we do our best to bring a safe e-ID for the top analysis…
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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The rest is History…
• The top is discovered in 1995
• Saclay is very proud of having been part of it (the only French group …)
– J Alitti, L Chevalier, Y Ducros, J-F Detoeuf, F Feinstein, J-F Glicenstein, D. Hubbard, J-F Lebrat, P
Mangeot, BM, A Pluquet, J Teiger, A Zylberstejn
• Thank you so much to our friends and their hospitality!
Among (many) others:
– Paul Grannis, Gene Fisk, Bob Lanou…. For D0
– Horst Wahl, Vasken Hagopian, Henryk Piekarz
for the TRD team…
• And many cheers to D0 run II…
Bruno Mansoulié, CEA/IRFU-SPP
D0 Meeting Oct 13th '08
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