This page contains ALL plots in the order as they appear in the CSC note, chapter Study of the rare decay B_s⁰ to mu+mu- in ATLAS. Only the CSC note contains all the relevant information and should thus be consulted if any of the plots is used.

Study of the rare decay B_s⁰ to mu+mu- in ATLAS Plots and Tables

Figure 2: Muon offline reconstruction efficiency as a function of pT . The superimposed histogram - pT spectrum of muons in the signal events (right scale).

Figure 3: Reconstructed Bs mass in barrel - when both muons have |η| < 1.1(left) and in the end-cap - both muons have |η| > 1.1 (right)

Figure 4: Transverse decay length of reconstructed B0s candidates. The signal is shown as closed circles, background as opened circles. Distributions are normalised to 1. The vertical line indicates the lowest transverse decay length allowed for selected events.

Figure 5: Distribution of isolation variable Imm for the reconstructed B0s candidates. The signal is shown as closed circles, background as opened circles. Distributions are normalised to 1. The vertical line indicates the lowest values of variable Imm allowed for selected events.

Figure 6: Distribution of pointing angle a for the reconstructed B0s candidates. The signal is shown as closed circles, background as opened circles. Distributions is normalised to 1. The vertical line indicates the highest values of a allowed for selected events.

Figure 7: The Monte Carlo di-muon mass distributions for signal B0s →μ+μ− (histogram), combinatorial background (closed circles) and non-combinatorial background (open circles and triangles) for (a) preselected events, (b) after cuts on transverse decay length, (c) pointing angle and (d) isolation. The number of events has been scaled to 10 fb⁻¹ of integrated luminosity.

Figure 8: Dimuon mass distribution for surviving events after applying all three cuts. The signal is shown as histogram, combinatorial background by closed circles and non-combinatorial backgrounds by opened circles and triangles. The combinatorial background is estimated assuming a factorisation of applied cuts. Statistics are given for an integrated luminosity 10 fb⁻¹.

Table 5: Selection efficiencies and number of signal and background events for integrated luminosity
of 10 fb⁻¹. Preselection criteria used: 4 GeV < M(μμ) < 7.3 GeV , vertex fit c χ² < 10 , transverse
decay length Lxy < 20 mm. Numbers of expected events are computed according to the Standard Model
expectation. In the left column for the b¯b mmX background the efficiencies are given separately for
each cut, in the right column the combined efficiency is given for the cuts on the pointing angle and on
the transverse decay length.

Major updates:
PatrickJussel - 19 Nov 2008
SergeySivoklokov - 11 Feb 2009
Responsible: AnnaUsanova
Last reviewed by: Never reviewed

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
gif	Fig2.gif	r1	manage	10.0 K	2008-12-21 - 23:46	SergeySivoklokov
gif	Fig3.gif	r1	manage	20.3 K	2008-12-21 - 23:47	SergeySivoklokov
gif	Fig4.gif	r1	manage	11.6 K	2008-12-21 - 23:48	SergeySivoklokov
gif	Fig5.gif	r1	manage	9.6 K	2008-12-21 - 23:48	SergeySivoklokov
gif	Fig6.gif	r1	manage	10.9 K	2008-12-21 - 23:49	SergeySivoklokov
gif	Fig7.gif	r1	manage	31.1 K	2008-12-21 - 23:50	SergeySivoklokov
gif	Fig8.gif	r1	manage	13.7 K	2008-12-21 - 23:51	SergeySivoklokov
png	Table5.png	r1	manage	11.3 K	2009-02-11 - 20:40	SergeySivoklokov