B2OC: Tbc & Xibc decays with similar final states
adding Tbc
(bcu~d~ tetraquark) and Xibc
decay lines to HLT2 aiming to make them similar between each other and to already existing Xibc lines.
While reducing rates to bring down to <200Hz had adjusted selection for existing Xibc
and Ombc
lines using created make_xibc2cx
, make_xibc2ccx
, make_tbc2cx
, make_tbc2ccx
with tighter cuts
- PT(Xibc/Tbc) > 6 GeV [was 5 GeV]
- PIDk(K) > -2, PIDp(p) > -2 [was -5]
- vtx(Charm)_Z - vtx(Xibc/Tbc)_Z > -0.5mm
- in Xibc/Tbc -> Charm + hadrons: PT(p/k/pi) > 500 MeV [was mainly 250 MeV]
- in Xibc/Tbc -> Charm1 + Charm2 + hadrons: PT(p/k) > 500 MeV, PT(pi) > 350 MeV
- in Xibc/Tbc -> Charm + hh: sumPT(hh) > 2.25 GeV
- in Xibc/Tbc -> Charm1 + CHarm2 + hh: sumPT(hh) > 1.25 GeV
Plus created dedicated tighter versions of D0
, D+
, Lc
, Xic
selectors named _for_xibc
with
- PIDk(K) > -2, PIDp(p) > -2 [was -5]
- PIDk(pi) < 2 [was 5]
- vchi2pdof < 7, [was 10]
- tighter mass windows:
- +-50MeV for D0->Kpi
- +-40MeV for D+->Kpipi, D0->K3pi, Lc->pKpi, Xic+->pKpi, Xic0->ppKpi
- and for D0->K3pi increased FD_chi2>49 [while keep 36 for all others]. Logic is that more tracks give better FD resolution, plus more pions in final state means larger background from PV.
All lines with D0
are in two variants - D0ToKPi
and D0ToKPiPiPi
. Merged versions D0ToKPiOrKPiPiPi
are also prepared and can be included in hlt2 or sprucing at any moment.
Edited by Ivan Polyakov