CERN/LHCC 94-7

LHCC 9

8 February, 1994

LARGE HADRON COLLIDER COMMITTEE

Minutes of the ninth meeting held on Thursday and Friday, 27-28 January 1994

CLOSED SESSION :

Present: J.V.Allaby, J.J.Aubert (Chairman), G.Brianti*, R.J.Cashmore, L.Di Lella, P.J.Dornan, P.Duinker, K.Einsweiler, F.Eisele, J.Ellis, L.R.Evans*, L.Foa, M.Haguenauer (for point 8), W.Hoogland, E.Iarocci*, P.G.Innocenti, K.Kajantie, V.Khovansky, C.Llewellyn Smith*, G.W.London, G.Matthiae (for point 8), G.Mikenberg, K.Potter, K.Pretzl, K.Schubert, D.M.Sendall (Secretary), M.Turala, H.Wenninger*, D.O.Williams

*) Part time

Apologies: E.Fernandez, S.Yamada

1. The minutes of the eighth LHCC meeting (LHCC 93-60 / LHCC 8) were approved without amendment.

The Chairman welcomed L.Evans and H.Wenninger as new ex officio members. He also thanked G.Brianti and K.Potter, who were retiring from the LHCC, for their contribution to the work of the committee. K.Potter will continue to attend some meetings by invitation.

2. C.Llewellyn Smith gave a brief summary of discussions at the Council meeting of December 1993. Both the LHC project and a long term plan for CERN had been presented to Council, and had been warmly received. A plan will be submitted for approval in the Spring of 1994, and discussions are continuing in parallel on possible financing schemes. The Director General also reported on various discussions on participation by the wider HEP community: ICFA in particular has made a very encouraging statement.

3. REPORT ON DETECTOR R&D

M.Turala reported on the R&D programme of the DRDC. Since its creation in 1990, the DRDC has received about 50 proposals, and now has a lively programme involving around 1500 participants. His review covered inner tracking, muon tracking, calorimetry, particle identification, front-end electronics, triggering and data-acquisition. Important progress has been achieved in all areas of detector technology. The programme has had a big impact on detector development for LHC and elsewhere.

4. REPORT ON THE COLLECT COMMITTEE

P.G.Innocenti reported on the work of the COLLECT committee. Set up in 1992 to coordinate computing for the LHC experimental programme, the committee has held eight meetings so far. The composition of the committee was presented, with a list of topics considered to date and some impressions of the working of the committee.

In the discussion, W.Hoogland described the setting up of two new bodies, the LHC Computing and Electronics Review Boards. Brief reports from these would be scheduled at the 6-7 April meeting of the LHCC.

5. B PHYSICS AT CDF

K.Einsweiler reported on the status and prospects for B physics at the CDF experiment at Fermilab, giving an insight into the field of hadron collider B physics prior to LHC turn-on. Current and foreseen results with the SVX silicon vertex detectors were described. Preliminary results are available for B -> psi + x inclusive lifetime, B+/- and B0 -> psi/psi' + Ks/K* exclusive lifetime, and observation of Bs -> psi + phi. Work is in progress on a variety of other physics channels: planned upgrades should allow observation of Bs mixing and measurement of sin2beta. Further prospects for CP violation measurements were discussed.

6. REFEREES REPORT ON B PHYSICS LETTERS OF INTENT

P.J.Dornan and J.Ellis reported on the work of the B physics referees. The potential for CP-violation measurements by a dedicated B physics experiment at LHC was compared with that of the general-purpose experiments and experiments at other facilities. The referees have put a number of questions to the three B physics collaborations, focusing on areas where they could in principle make better measurements than other types of experiment, in particular measurements of sin2alpha and xs. Detailed simulations will be needed, and a written report has been requested in time for the next LHCC meeting.

In the subsequent discussion on B physics, the LHCC considered the case for a dedicated B experiment at the LHC, and agreed on a recommendation to be sent to the Director General for consideration by the Research Board. A copy of this recommendation is attached to the minutes.

7. ALICE REFEREES REPORT

K.Pretzl reported on the work of the ALICE referees. Further progress has been made on the questions put by the referees. A written report has been requested in time for the next LHCC meeting, addressing points raised by the referees and the LHCC recommendations of November 1993 (LHCC 93-61).

8. MACHINE IMPLICATIONS OF TOTEM

L.R.Evans summarised the implications for the LHC machine of the letter from the TOTEM collaboration (LHCC 93-47). A study has been made of a possible high beta insertion (LHCC 94-6). This indicates that the Leff required for the option of absolute normalisation of the elastic rate with Coulomb scattering cannot be realised. For the option of extrapolation of the rate to the optical point, a value of Leff somewhat less than that requested could be achieved. The collaboration will study the implications of this.

9. ATLAS AND CMS TECHNICAL PROPOSALS

In the light of the decisions of the 25 November 1993 meeting of the Research Board, the LHCC rediscussed the guidelines for technical proposals set out in their earlier recommendations (LHCC 93-41). The committee agreed on a revised version of these guidelines to be sent to the Director General for consideration by the Research Board. A copy is attached to the minutes.

10. TIMETABLE AND FUTURE MEETINGS

The Chairman pointed out that a large number of physics issues had been raised and covered by the existing Letters of Intent. It may now be the time to consider other topics which may have escaped attention, for instance in top physics and in some possible new approaches to diffraction physics considered for the SSC programme. It could be useful to have a short workshop to be sure that all interesting possibilities have been covered. The Chairman will prepare some proposals with J.Ellis and L.DiLella for consideration by the LHCC. Suggestions from the community for other topics will be welcome.

11. DATES FOR 1994 MEETINGS

6-7 April

7-8 June

30-31 August

9-10 November