#+TITLE:     B-physics stuff
#+AUTHOR:    Suvayu Ali
#+EMAIL:     Suvayu dot Ali at cern dot ch
#+LANGUAGE:  en
#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:{} -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:nil
#+EXPORT_SELECT_TAGS: export
#+EXPORT_EXCLUDE_TAGS: noexport


* Parameters
A random source block
#+begin_src python
  print 'Hello'
  
  print 'Hello again!'

  print 'Hello again, again!'
#+end_src

From ConDBBrowser:
| PARTICLE | GEANTID | PDGID |  MASS(GeV) |      TLIFE(s) | EVTGENNAME |
|----------+---------+-------+------------+---------------+------------|
| B_s0     |      75 |   531 | 5.36630000 | 1.472000e-012 | B_s0       |
| B_s~0    |      76 |  -531 | 5.36630000 | 1.472000e-012 | anti-B_s0  |
| B_s0H    |   99996 |   530 | 5.36630000 | 1.536875e-012 | B_s0H      |
| B_s0L    |   99997 |   350 | 5.36630000 | 1.407125e-012 | B_s0L      |


* Bachelor particle opening angle as PID
  :PROPERTIES:
  :CUSTOM_ID: opening-angle
  :END:

** Important points
[[notmuch:id:20120102164039.2827616d@nikhef.nl][Notmuch email thread with comments]]

1. Bs⁰ is pseudo-scalar meson: decays isotropically in its rest frame,
   idea is to exploit this fact to better separate Bs⁰→Dsπ and Bs⁰→DsK
   crossfeed
2. Dependence on mass hypotheses:
   - Opening angle in lab frame (does not depend on mass hyp.)
   - Boost back to Bs⁰ rest frame (depends on mass hyp.)
   - if mass hyp. correct, cos(θ*) must be flat (isotropic decay of
     scalar!), mass must be Bs⁰ mass within resolution

     some modification to flat cos(θ*) distribution due to /detector
     acceptance/ effects


* Tagging Issues
  :PROPERTIES:
  :CUSTOM_ID: tagging
  :END:

How should SS and OS tagging decisions be combined?  What do we do in
overlap regions b/w the two taggers?
#+begin_example
  +----------------------------------+
  |                                  |
  |    +---------------+             |
  |    |               |             |
  |    |  OST    +-+-+-+--------+    |
  |    |         |/ / /|        |    |
  |    |         | / / |        |    |
  |    +---------++-+-++        |    |
  |              |        SSK   |    |
  |  All events  |              |    |
  |              +--------------+    |
  |                                  |
  +----------------------------------+
#+end_example


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