bfys-physics July 2017

bfys-physics@nikhef.nl

2 participants
3 discussions

[Bfys-physics] Fwd: First circulation of publication draft for PAPER-2017-030, Measurement of $C\!P$ observables in $B^\pm \to DK^{\ast \pm}$ decays using two- and four-body $D$-meson final states
by Patrick Koppenburg 15 Aug '17

15 Aug '17

Dear all, The EB is providing us reading material for the beach (or the office): a paper that should be called "yet another measurement of gamma". Lennaert kindly agreed to collect comments. The deadline is Thursday 3 August, so please send comments by Wed 2nd. Cheers, Patrick -------- Forwarded Message -------- Subject: First circulation of publication draft for PAPER-2017-030, Measurement of $C\!P$ observables in $B^\pm \to DK^{\ast \pm}$ decays using two- and four-body $D$-meson final states Date: Thu, 20 Jul 2017 17:29:28 +0000 From: fergus.wilson(a)stfc.ac.uk To: lhcb-general(a)cern.ch CC: LHCb-PAPER-2017-030-reviewers(a)cern.ch Dear Colleagues, A draft paper is available for your comments. Team leaders, verify the author list and check for reading obligations of your group (see below)! Title : Measurement of $C\!P$ observables in $B^\pm \to DK^{\ast \pm}$ decays using two- and four-body $D$-meson final states Journal : JHEP Contact authors : Anita_Nandi, Sneha_Malde Reviewers : Jonas_Rademacker (chair), Eva_Gersabeck EB reviewer : David_Ward EB readers : Roland_Waldi, Alberto_Correa_dor_Reis Analysis note : ANA-2017-005 Deadline : 3-Aug-2017 e-group : lhcb-paper-2017-030-reviewers Link : https://cds.cern.ch/record/2275257 Authors : LHCb Twiki : https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/Bu2DKstar The following institutes are requested to make institutional comments: Cincinnati__United_States Ruprecht-Karls-Universitaet_Heidelberg__Germany Valencia-CSIC__Spain NIKHEF__Amsterdam__The_Netherlands RWTH_Aachen__Germany IHEP__Protvino__Russia Please send any comments via the CDS system. It is the responsibility of the contact authors to provide replies to all comments made. Subsequent modifications to the draft will be made in consultation with the reviewers and during the EB reading. Following this, there will be a final meeting of the editorial board, with contact authors and reviewers present, when final decisions will be made. As the last step, the collaboration will be given a final opportunity to comment during a 'silent approval' period. You can find all paper and conference report drafts open for comments via the EB web-page, by clicking on Current Drafts: http://lhcb.web.cern.ch/lhcb/lhcb_page/collaboration/organization/editorial… Best regards, Fergus ------------------------------------------------------------------------------------ Fergus Wilson, PPD & CERN, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon, OX11 0QX, UK. Tel: +44-(0)1235 445259 Fax: +44-(0)1235 445672 CERN Tel: +41-22 76 77379 Skype: ferguswilson5259

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[Bfys-physics] Fwd: LHCB-PAPER-2017-025-001-COMMENT-010 (a comment has been made on your comment)
by Patrick Koppenburg 06 Jul '17

06 Jul '17

More replies on Bose-Einstein. -------- Forwarded Message -------- Subject: LHCB-PAPER-2017-025-001-COMMENT-010 (a comment has been made on your comment) Date: Thu, 6 Jul 2017 09:55:14 +0200 From: CERN Document Server Submission Engine <cds.support(a)cern.ch> To: patrick.koppenburg(a)cern.ch Dear LHCb Colleague, The comment (LHCB-PAPER-2017-025-001-COMMENT-009) that you made on LHCB-PAPER-2017-025-001 (entitled: 'Study of the Bose-Einstein correlations of same-sign charged pions at $\sqrt{s}=7$ TeV') has itself been commented on by Marcin Kucharczyk [CERN - EP/ULB] (marcin.kucharczyk(a)cern.ch). This new comment (LHCB-PAPER-2017-025-001-COMMENT-010) may be seen at http://cds.cern.ch/record/2273360 Best regards, The CERN Document Server Server support Team

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[Bfys-physics] Bose-Einstein comments
by Patrick Koppenburg 05 Jul '17

05 Jul '17

Hi all, Marcin has replied to our comments. Please see https://cds.cern.ch/record/2273007 An annoyance is that out of six assigned institutes only one has replied (me want cookie!). I wonder now how Vincenzo will decide whether this goes to EPS (or, well, I know too well). Many replies make me unhappy. > The fits in Fig.2 are very bad at low Q. You do not mention this. How > good are your fits in terms of Q2? It shows that the parameterization > is not fully correct. In particular we worry since there is a > correlation between the radius and chaoticity parameters. There must > be a systematic effect involved. > -> Yes, we did not mention this on perpose. We would like to avoid > such a discussion. It is known feature with this kind of > parametrisation seen always in analyses from other experiments. One > can hardly find a paper about BEC with such a discussion. People > tried another parametrisations giving better chi2/ndf of the fit but > interpretation of the parameters is then not straigthforward, and they > are not quoting any results from such fits. Therefore, all the > published results are quoted for Levy parametrisation or Gaussian fit > allowing to compare the results. No one discussed the features of the > fit in detail. You cannot avoid such a discussion as it already started in LHCb. We see that the fit is better in the ATLAS paper (1502.07947) and in the CMS paper (1101.3518). In the latter the chi2/Ndof is given and they write "The fit quality is poor, as can be seen from the values of χ2 /Ndof . Gaussian parameterizations, which are used by some experiments, provide values of χ2 /Ndof larger than 9, which confirms the observation in [4] that an exponential parameterization is preferred." In 1005.3294 they also give fit probabilities. So not mentioning what is visible by eye is not a good strategy. What we are worried about is that for a bad fit the value of the parameters is biased or even meaningless. The size of such a bias should be assessed. > We decided to use 2011 data only since we did not have the pythia8 > simulation for 2010 sample. This was taken 7 years ago. There was plenty of time to address that. Cheers, Patrick -- ======================================================================== Patrick Koppenburg Nikhef, Amsterdam http://www.koppenburg.ch/address.html

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bfys-physics July 2017