ORGANISATION EUROPÉENNE POUR LA RECHERCHENUCLÉAIRE
CERN EUROPEAN ORGANIZATION FORNUCLEAR RESEARCH
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CERN RESEARCH BOARD
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MINUTES OF THE 137th MEETING OF THE RESEARCH BOARD
HELD ON THURSDAY, 17 SEPTEMBER 1998
 

Present : L. Camilleri Secretary), R. Cashmore, A. De Rujula,C. Détraz, J. Engelen, L. Evans, L. Foà, B. Gavela, G. Goggi,J-P. Gourber, K. Hübner, K. Königsmann, C. Llewellyn Smith Chairman),J. May, D.J. Miller,
S. Myers replacing K-H. Kissler), T. Nilsson, J-P. Riunaud replacingD. Simon), P. Sphicas, M. Spiro,
E. Tsesmelis, S. Weisz.

Apologies: K-H. Kissler, L. Maiani, A. Richter, D. Simon, H.Wenninger.
 

Items

1. Procedure

2. Reports and matters arising from the LHCC Meetings of 9-10 July and3-4 September 1998

3. Reports and matters arising from the SPSC Meeting of 1 September1998

4. Reports and matters arising from the LEPC Meeting of 15 September1998

5. Any other business

1. PROCEDURE

The Director General welcomed K. Königsmann, the new Chairman ofthe SPSC and B. Gavela, a new external member.

The Minutes of the last meeting [1] were approved with the followingchanges.

Cover page: Apologies: J. May, D.J. Miller.

Page 2, line 28:...than Pestov counters.

Page 3, line 26:...target followed by an 800m long transfer linewith a downward slope of 5.6% and a 1 km long decay tunnel. It results...

Page 4, line 4: ... beam at Fermilab, the same...

2. REPORTS AND MATTERS ARISING FROM THE LHCC MEETINGS OF 9-10 JULYAND
    3-4 SEPTEMBER 1998

J. Engelen first reported on the LHCC meeting of 9-10 July. At thismeeting the LHCC heard a report by the CMS referees on the CMS TrackerTDR [2]. The main worry in the tracker design concerns the MSGC's. Althoughtests of the MSGC's designed for CMS have not suffered from the sparkingproblems noted by other groups, their survivability during 10 years ofoperation under LHC running conditions will have to be demonstrated duringtests at PSI. Another concern arises from the two-stage approach that CMShas been forced to adopt due to funding limitations. If this situationpersists at LHC turn on, a full proposal for the staging plan and its implicationswill have to be presented to the LHC. The LHCC recommends general approvalof this Technical Design Report. The Research Board approved thesubmitted TDR under the LHCC formulation which allows the committee tomonitor future progress of this project through the implementation of theschedules and milestones listed in the ancillary document.

The Chairman of the LHCC then reported on the presentation of the refereeson the LHCb Technical Proposal [3]. In light of the main beauty productionmechanism being gluon fusion the single arm forward spectrometer geometrychosen by the collaboration is justified. The triggering scheme chosenshould allow efficient recording of b events. Finally the physics reachof the experiment goes beyond that of ATLAS and CMS at the LHC and willbe more versatile than that of B factory experiments. He also noted thatthe CORE review had now been successfully completed. The LHCC thereforerecommends general approval of the LHCb Technical Proposal. L. Foàthen presented the conclusions of the first meeting of the Resource ReviewBoard on LHCb. Assuming that part of the neutrino beam line shielding ironis used by LHCb, the present cost of the experiment is 82 MCHF of whichfunding agencies seem to be reasonably sure to provide 72 MCHF. In viewof the fact that the geometry of the experiment lends itself to stagingthis shortfall of funds should not delay approval. The Research Board concurredwith this view and approved the LHCb Technical Proposal noting thatthe LHCC will continue to monitor the progress of this proposal accordingto the schedules and milestones outlined in the ancillary document. Theactual cost ceiling of LHCb, which will be no more than 82 MCHF, will beset when, the funding issues having been clarified, the first TechnicalDesign Reports are submitted to the LHCC.

J. Engelen then reported on the meeting of 3-4 September 1998. He presentedthe conclusions of the LHCC on the ATLAS Pixel Detector Technical DesignReport [4]. This detector uses state of the art technology but no majorconcerns have been identified. It is recommended that a solution that avoidsbake-out in this region be developed. The LHCC recommended general approvalof the TDR. The Research Board approved this TDR under the LHCCformulation which allows the committee to monitor future progress of thisproject through the implementation of the schedules and milestones listedin the ancillary document.

The Chairman of the LHCC then summarised the discussions of the LHCCconcerning the ATLAS First-Level Trigger Technical Design Report [5]. Thesystem is well suited to the experimental requirements and, since it isnot hard-wired, allows for flexibility. No major concern was expressedand the LHCC therefore recommends this TDR for approval. The Research Boardapproved the ATLAS First-Level Trigger Technical Design Report underthe LHCC formulation which allows the committee to monitor future progressof this project through the implementation of the schedules and milestoneslisted in the ancillary document.

J. Engelen informed the Research Board that the LHCC acknowledges theinterest of the request by ATLAS and CMS to use test beams with a 25 nsbunch structure. The chairmen of the LHCC and SPSC agreed that the refereesappointed by their respective committees to study this request should worktogether to formulate a scheme that will satisfy both experiments whileminimizing disruptions to other users.

3. REPORTS AND MATTERS ARISING FROM THE SPSC MEETING OF 1 SEPTEMBER1998

K. Königsmann reported on this meeting of the SPSC. The SPSC recognizesthe interest of producing and measuring the polarisation of high energylinearly polarised photons which is the subject of Proposal P308 [6].This study could also lead to the production of a circularly polarisedphoton beam. The SPSC recommended to the Research Board the approval ofthis proposal for a 3-week run during which the collaboration should emphasizethe linear polarisation part of the proposal. The run should occur at thebeginning of 1999 given the long setting up time required. The ResearchBoard concurred with this recommendation. The new experiment willbe referred to as NA59.

He went on to describe the physics of the Spallation facility proposedin I220 [7]. The SPSC has asked the PS and TIS division to conducta feasibility study. The committee has also asked the proponents to demonstratethe uniqueness of this facility and the advancement of knowledge that itwould provide. A more thorough discussion of this Letter of Intent is plannedfor the next SPSC 3-4 November).

K. Königsmann also informed the Research Board of a joint meetingbetween the SPS and Gran Sasso scientific committees to be held at CERNon 3-4 November to discuss the opportunities provided by a neutrino beamto the Gran Sasso Laboratory. A letter [8] announcing this meeting willbe circulated through the Research Board Minutes mailing list. In answerto a suggestion by B. Gavela to broaden the discussion to include all possibleneutrino sources, the Research Board was informed that indeed general presentationswould be part of this meeting.

3. REPORTS AND MATTERS ARISING FROM THE LEPC MEETING OF 15 SEPTEMBER1998

M. Spiro reported on the excellent performance of LEP. The machine hasbeen running at a centre of mass energy of 189 GeV and has already delivered120 pb-1 per experiment. The goal of 150 pb-1 forthe year seems to be well within reach. Heating problems observed in rfantennae cables will necessitate the replacement of these cables at thenext shutdown. A slightly uneven ±7%)luminosity distribution between the four interaction regions has been noted.Care will be taken to minimize this spread.

The machine is performing very well at high energy and it is hoped toreach a centre of mass energy of 200 GeV next year with a luminosity perexperiment of over 200 pb-1 . It is hoped that this increasein luminosity and energy will be accompanied by an improved knowledge ofthe beam energy using a beam spectrometer. The goal of this measurementis to reduce the present measurement uncertainty of 25 MeV per beam to10 MeV. This should allow a measurement of the W mass with a precisionof 25 MeV/c2 by the year 2000, down from the present precisionof 90 MeV/c2 .

The present limits obtained from data taken before this year are: mH0> 89.8 GeV/c2 on the Standard Model Higgs and mh> 78.8 GeV/c2 and mA > 79.1 GeV/c2 forthe MSSM. The discovery potential by the year 2000 is mH0< 107 GeV/c2 assuming that the machine will run at 200 GeVand that the luminosity will reach 200 pb-1 . It is worth notingthat a gain of 2 GeV in centre of mass energy is worth a factor of twoin luminosity.

The Research Board discussed the possible running of LEP beyond theyear 2000 if the physics warranted it. It was emphasized that, given thefinancial and scheduling implications of such a decision, it could onlybe envisaged if a major and unambiguous discovery was made. It was thereforestressed that the data collected in the year 2000 would have to be analysedin a timely fashion.
 
 

6. OTHER BUSINESS

It was suggested by B. Gavela that the Research Board discuss, oncein a while, longer term research interests. The Director General pointedout that this was rather the role of the Scientific Policy Committee. Howeverit was agreed that a report by the Director General to the Research Boardon SPC deliberations would be a useful innovation.

The following dates for the Research Board in 1999 were agreed to:

Thursday, 4 February

Thursday, 15 April

Thursday, 10 June

Thursday, 16 September

Thursday, 18 November

The next Research Board meeting will be postponed to Monday, 23 November1998. Please note the unusual day.
 

ENCLOSURES

[1] Minutes of the 35th LHCC meeting held on 9-10 July 1998LHCC 98-22/LHCC 35).

[2] Minutes of the 36thLHCC meeting held on 3-4 September1998 LHCC 98-29/LHCC 36).

[3] Minutes of the 39th SPSC meeting held on 1 September1998 SPSC 98-22/SPSC 39).

[4] Minutes of the 49th LEPC meeting held on 15 September1998 LEPC 98-7/LEPC 49).

REFERENCES

[1] Minutes of the 136th meeting of the Research Board heldon 6 July 1998 DG/RB 98-270, M136).

[2] The Tracker Project Technical Design Report CMS collaboration;
LHCC 98-6/CMS TDR 5).

[3] LHC Beauty Experiment for Precision Measurement of CP Violationand Rare Decays LHCb collaboration; LHCC 98-4/P4).

[4] Pixel Detector Technical Design Report ATLAS Collaboration; LHCC98-13/ATLAS TDR11).

[5] First-level Trigger Technical Design Report ATLAS Collaboration;LHCC 98-14/ATLAS TDR12).

[6] Proposal to study the use of a crystal as a 'quarter-wave plate'to produce high energy circularly polarized photons
      Yerevan -Firenze-Torino-CERN-Perugia-SchonlandResearch Centre Johannesburg-Fermilab-NIKHEF-
      Kurchatov Institute Moscow-Aarhus-Santiagode Compostela-DESY-Novosibirsk-UCLA; SPSC 98-17/P308).

[7] Letter of Intent: A CERN-PS experimental campaign to measure neutroncross sections from 1eV to 250 MeV with
      high resolution CEN, Bordeaux-CERN-CRS4,Cagliari-EC, Joint Research Center, IRMM, Geel-Univ. of Basel-
      Univ. of Thessaloniki; SPSC 98-15/I220).

[8] Letter announcing a joint meeting of the CERN-SPS and Gran SassoScientific Committees.