bfys-physics

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520 discussions

[Bfys-physics] mnalysis meeting next Monday
by Nicola Serra 05 Mar '10

05 Mar '10

Dear all, Patrick and Vany made me notice that after Xmas we didn't restart our analysis meetings, I apologize for that. So next analysis meeting will be next monday at 1..00 as usual, please let me know if anybody wants to present something. Best regards, Nico P.S.: Sorry I forgot the subject in my previous email

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[Bfys-physics] Fwd: LHCb T1 meeting
by Marcel Merk 05 Mar '10

05 Mar '10

Dear bfys friends, On Monday 22nd and Tuesday 23rd March, Nikhef and SARA jointly organise a Tier-1 workshop at Nikhef. This workshop is very useful for those of you planning to analyse the incoming data and discuss with GRID and LHCb computing people. The agenda of the meeting can be found below in the message of Nick Brook and on Indico: http://indico.cern.ch/conferenceDisplay.py?confId=84713 If you plan to join the meeting and/or dinner please register on the registration link on the indico page as it helps the organisers with catering etc. Cheers, - Marcel Begin forwarded message: > From: Nick Brook <Nick.Brook(a)cern.ch> > Date: 10 February 2010 21:57:28 CET > To: <lhcb-grid(a)cern.ch> > Subject: LHCb T1 meeting > > Dear All > > We would like to hold a "Tier-1 Jamboree" and we plan to synchronise this > with the GDB meeting in March in Amsterdam. The plan would be to start the > meeting on Monday 22nd March at 14:00 and end lunchtime on Tuesday 23rd. > NIKHEF are happy to host the meeting. A very draft agenda is attached below. > The purpose of this email is to check your availability. Of course if you > feel you have burning issues you wish to add to the agenda let me know. > Jeff Templon at NIKHEF is looking for a swift answer on the number of > participants so he can organise things on his side, so if you can let me > know if you're interested asap that would be most appreciated, > > Many thanks, Nick > > > 14:00 LHCb Computing Model: Re-introduction (45') > - explanation of the LHCb computing model > > 14:45 Experience with production so far (25') > - a general overview ; more detailed discussion in following talks on SE > technology > > 15:10 Experience of use analysis on the Grid (25') > > 15:35 TEA (20') > > 15:55 Experiences with CASTOR (15') > - detailed discussion around CASTOR > > 16:10 Experiences with dCache (30') > - detailed discussion around dCache > > 16:40 Experiences with StoRM (15') > - detailed discussion around StoRM > 16:50 END > > 9:30 Introduction to DIRAC (45') > > 10:15 LHCb SAM tests (30') > > 10:45 COFFEE > > 11:05 SLC5 status (30') > - status of applications; deployment plans; timescales for SL4 on Grid > > 11:35 Planned use of Glexec (40') > > 12:15 Planned use of CREAM CE (20') > > 12:35 LUNCH > > > >

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[Bfys-physics] (no subject)
by Nicola Serra 02 Mar '10

02 Mar '10

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[Bfys-physics] Fwd: stoomboot uitbreiding
by Marcel Merk 25 Feb '10

25 Feb '10

For your information, the following states that there are two stoomboot nodes available with slc5, exclusive LHCb. The queue is stbcq. Cheers, - Marcel ---------- Forwarded message ---------- From: Ton Damen <tond(a)nikhef.nl> Date: 2010/2/25 Subject: stoomboot uitbreiding To: Marcel Merk <marcel.merk(a)nikhef.nl> Hoi Marcel, Ik weet niet wie er bij jullie op dit moment geïnteresseerd is het runnen van jobs op de stoomboot cluster, maar er zijn nu twee nodes voor test beschikbaar met slc5 exclusief voor lbcb gebruikers. De queue heet "stbcq" en kan met de optie -q van qsub worden opgeven. Grt, Ton -- A.C.M. Damen Computer Technologie Groep NIKHEF - Dutch National Institute for Sub-atomic Physics Kruislaan 409 1098 SJ Amsterdam Tel. +3125925121

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[Bfys-physics] Bfys meetings: Friday 12/2 at 9 o'clock
by Tjeerd Ketel 17 Feb '10

17 Feb '10

Dear all, You are invited to the Bfys meeting about Physics with VELO upgrade tomorrow, Friday 12 February, at an early time 9:00-11:00 h to allow for both the Nikhef colloquium and the VELO meeting at CERN. Friday 12 February 2010 in N328 9:00->11:00 Physics with VELO upgrade 9:00 Resolution (30') 9:30 Acceptance (30') 10:00 Trigger (30') 10:30 Momentum (20') ===================================================== EVO Booking: Title: Nikhef Bfys Description: 9:00-11:00 Physics with VELO upgrade Community: LHCb Password: n328 Meeting Access Information: - Meeting URL http://evo.caltech.edu/evoGate/koala.jnlp?meeting=M2MvMB2a2tDMDi9v9BDM92 - Password: n328 - Phone Bridge ID: 1626665 Password: 6287

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[Bfys-physics] LHCb upgrade plans Nikhef
by Marcel Merk 08 Feb '10

08 Feb '10

Dear bfys friends, Although we are about to start our first long physics run I would like to draw your attention to our longer term future: the LHCb upgrade program. As there are several discussions and activities starting (in lhcb as well as in NL) it is usefull to formulate a "partyline statement" reflecting our plans at Nikhef. This statement is intended as a first step towards a further implementation of projects to which are group plans to contribute. Such discussions are in fact already starting up this week. If you have comments on this statement below, or would like to modify it, please contact me. ----------------------------------------------------------------------------------------------------- The currently planned Nikhef investments in the LHCb upgrade involve A) Software tracking studies B) Outer Tracker and C) Velo. A: Tracking Studies ----------------------------- To optimize the LHCb upgrade our group is interested and participates (at a modest level) in detector performance studies studies, typically aimed at robust parameters as resolution, occupancy, material, etc. Both for Velo and OT. B: Outer Tracker ------------------------ For the OT a choice between a straw detector and a fiber detector for (part of) the OT is being considered by the collaboration. Nikhef looks at the current straw solution for the upgrade. 1) The detector: We invest heavily in understanding, controlling and curing possible aging effects of the OT straw detectors. The idea is that for occupancy and resolution purposes the current straw detectors are a suitable solution for, at least part of, an OT upgrade tracker. 2) The electronics: LHCb has established an upgrade scenario that foresees readout at significantly higher speed, up to 40 MHZ. Nikhef participates in an R&D project to study a FPGA solution in combination with an array of fast optical transmitters for such readout speed. C: Velo ----------- For the Velo a decision between a possible pixel detector and a strip detector has not yet been made by the collaboration. Our group is interested in R&D for the pixel option. 1) We are starting an electronics-oriented effort in the design of the Velopix detector, in the context of the Medipix/Timepix R&D group. The effort includes the hybrid, chip design and readout, as well as studies towards edgeless sensor technology. 2) We expressed an interest to participate in thermal and mechanical R&D to the pixel cooling. best regards, - Marcel

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[Bfys-physics] Fwd: Seminar Eduardo Rodrigues
by Marcel Merk 08 Feb '10

08 Feb '10

---------- Forwarded message ---------- From: Marcel Merk <marcel.merk(a)nikhef.nl> Date: 8 February 2010 08:43 Subject: Seminar Eduardo Rodrigues To: bfys-group(a)nikhef.nl Dear Collegues, I would like to announce and invite you for a special Seminar at Nikhef by a visiting guest Eduardo Rodrigues, on Tuesday 9 feb at 15h30 in room N328 with the title: "The Why, How and Where of Lepton Flavour Violation" best regards, - Marcel Abstract: Lepton number seems conserved in nature. Yet this conservation law does not come in naturally in the standard model. And, in fact, most models beyond it feature lepton number violation to some extent. Theoretically speaking, there is no reason for imposing lepton number conservation. Somewhat softer, lepton flavour violation in the neutral lepton sector has been proven just a few years ago and one is in the right to expect a similar violation in the charged lepton sector. The topic will be first motivated, stressing the links between particle physics and cosmology. The experimental situation and prospects for the future will then be reviewed.

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[Bfys-physics] Feynman: 2'45" preparation for this afternoons colloquium?
by Niels Tuning 05 Feb '10

05 Feb '10

Hi, Apparently Erik Verlinde makes the analogy of the 'force' in a rubber bands. Perhaps not for you, but it was new to me... Richard explains: http://www.youtube.com/watch?v=XRxAn2DRzgI Cheers, Niels ---------- Forwarded message ---------- Date: Fri, 22 Jan 2010 13:10:19 +0100 From: aart heijboer <aart.heijboer(a)gmail.com> To: Niels Tuning <Niels.Tuning(a)cern.ch>, Wouter Verkerke <verkerke(a)nikhef.nl>, wouterh(a)nikhef.nl, Gerhard Raven <Gerhard.Raven(a)nikhef.nl> Subject: dont take my word for it. http://www.youtube.com/watch?v=XRxAn2DRzgI

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[Bfys-physics] A heavy dimuon
by Patrick Koppenburg 04 Feb '10

04 Feb '10

Hi all, There is ONE event that ends up in the J/psi stream in the latest "V0" stripping of the 2009 real data. It is one candidate that passes all three J/psi selections run in that stream. It's a bit heavy for a J/psi (3214 MeV): Name E M P Pt phi Vz MeV MeV MeV MeV mrad mm J/psi(1S) 20348.72 3214.84 20093.17 1534.90 -1462.45 -14.73 +-->mu+ 17063.02 105.66 17062.69 1736.06 -2197.93 -14.63 +-->mu- 3283.62 105.66 3281.92 1190.53 -100.64 -15.84 It has a large Pt, the muons have an IP chi2 of less than 0.5. One muon is well identified, the other one isn't. If anyone wants to look at it in Panoramix, please do. The PFN at CERN is /castor/cern.ch/grid/lhcb/data/2009/DST/00005848/0000/00005848_00000004_1.Jpsi.dst , from which you can extract the LFN. As it's stripped it should also be copied to Nikhef. Cheers, Patrick -- ======================================================================== Patrick Koppenburg Nikhef, Amsterdam http://www.koppenburg.org/address.html

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[Bfys-physics] Bier in N256
by Jan Amoraal 04 Feb '10

04 Feb '10

Hallo, We hereby cordially invite you to celebrate our birthdays with a beer or two in N256. cheers, Jan & Wouter

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