SL: Bc2BsX lines

This MR replaces: !1309 (closed)

Description of the line

Line for Bc->Bslnu selection. Includes selections for channels:

• B_c^+ \to B_s^0 \mu^+ \nu_\mu
• B_c^+ \to B_s^0 e^+ \nu_e
• B_c^+ \to B_s^0 \pi^+
• B_c^+ \to B_s^0 K^+

with six B_s^0 decay channels:

• B_s^0 \to (D_s^- \to K^+ K^- \pi^-) \pi^+
• B_s^0 \to J/\psi \phi
• B_s^0 \to (D_s^- \to K^+ K^- \pi^-) K^+
• B_s^0 \to K^+ K^-
• B_s^0 \to K^+ \pi^- and cc
• B_s^0 \to \pi^+ \pi^-

Cuts ported from StrippingBc2Bs. Tracked in issue #288

Some generic builders also edited to be applicable to my use cases.

MC samples used in the development

Channel-specific MC:

B_c^+ Decay	B_s^0 Decay	Event Type	Size
B_c^+ \to B_s^0 \mu^+ \nu_\mu	B_s^0 \to (D_s^- \to K^+ K^- \pi^-) \pi^+	14575001	100K
B_c^+ \to B_s^0 \mu^+ \nu_\mu	B_s^0 \to J/\psi \phi	14545006	100K
B_c^+ \to B_s^0 \pi^+	B_s^0 \to (D_s^- \to K^+ K^- \pi^-) \pi^+	14165002	100K
B_c^+ \to B_s^0 \pi^+	B_s^0 \to J/\psi \phi	14135000	100K

Contact people

@tmcgrath @adavis @gersabec

Adding also: @jugarcia @amathad @anmorris