Hi Diego,
If you intend to reply, I would like to add a comment here, see below.
Cheers, Niels
Q: -Could you provide an LHCb average of tau_Lb/tau_B0, which other
analyses could use?
A: This would essentially be the result in this paper, since our uncertainties are much smaller. However, there is an added complication on how to deal with the correlated systematic uncertainties in the two measurements, especially since I expect that mainly the same events were used. Even in principle, I don’t understand how to average these numbers.
The samples are not the same: PAPER-2013-065 (https://cds.cern.ch/record/1645857?ln=en) uses Lb->J/psi L(->p pi) decays, whereas you use Lb->J/psi pK decays.
If we would naively average the two results, PAPER-2013-065 tau_Lb/tau_B0 = 0.929 +- 0.0184 PAPER-2014-003 tau_Lb/tau_B0 = 0.974 +- 0.0072 and ignore correlated systematic errors, we find: tau_Lb/tau_B0 = 0.9680 +- 0.0067
It would be of added value to quote this number in your paper.
On Mon, 3 Feb 2014, Diego Martinez Santos wrote:
Hi
Please find below the answers from Sheldon about the /\b lifetime: http://cds.cern.ch/record/1645926
Cheers;
Diego
Dende: bfys-physics-bounces@nikhef.nl [bfys-physics-bounces@nikhef.nl] en nome de Niels Tuning [h71@nikhef.nl] Enviado: venres, 31 de xaneiro de 2014 11:30 Ata: Tjeerd Ketel CC: bfys-physics@nikhef.nl Asunto: Re: [Bfys-physics] Bfys Meeting Friday 31 January at 9:30 in !!! N328 !!!
Hi Diego,
Below are my comments on the Lb lifetime paper.
Cheers, Niels
Main comments
You should refer to the other tau_Lb paper by LHCb: PAPER-2013-065
Could you provide an LHCb average of tau_Lb/tau_B0, which other
analyses could use?
- L.126 You mention the pK- mass spectrum. It is useful to add the
corresponding plot.
Minor comments
L.9/10 You say 1/mb2 terms are 'tiny' and 1/mb3 terms are 'small'. Is it really so that O(1/mb2) < O(1/mb3) ?
L.14 'In 2003 one data average gave' -> 'In 2003 one ratio was'
L.16 'while some thought that' -> 'while others thought that'
L.20 Suggest to rephrase, 'data collected with ... luminosity' , because data is not collected with luminosity?
L.184: Figs.4 and 5., and Fig.6 is a bit far from L.184. Suggest to group Figs.4 and 5 together, and get Fig.6 closer.
L.229 Add title 'Acknowledgments'
Ref [16] Add journal: JINST 9 (2014) P01002 Ref [19] Replace by trigger paper
On Thu, 30 Jan 2014, Tjeerd Ketel wrote:
Dear colleagues,
Bfys Meeting Friday 31 January at 9:30 in !!! N328 !!! and Vidyo
9:30 - 10:15 Introduction and discussion by Diego of PAPER-2014-003: Precision measurement of the $\Lambda_b^0/\overline{B}^0$ lifetime ratio https://cds.cern.ch/record/1643936
10:15 - 11:00 Introduction and discussion by Maurizio of PAPER-2014-001: Observation of photon polarization in $B^\pm\to K^\pm\pi^\mp\pi^\pm\gamma$ decays https://cds.cern.ch/record/1644210
We succeeded to get N328 and we can continue until 12:00, if needed.
The material can be found at http://agenda.nikhef.nl/conferenceDisplay.py?confId=2799 and will be protected by lhcb, etc.
Vidyo link in Nikhef Bfys Meeting (at Institutes->Nikhef of Friday 21 June 2013) https://indico.cern.ch/conferenceDisplay.py?confId=255991 protected by PIN 1328.
Best regards, Tjeerd
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