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d0_to_ksks.py
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345
d0_to_ksks.py
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###############################################################################
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# (c) Copyright 2020 CERN for the benefit of the LHCb Collaboration #
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# #
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# This software is distributed under the terms of the GNU General Public #
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# Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". #
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# #
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# In applying this licence, CERN does not waive the privileges and immunities #
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# granted to it by virtue of its status as an Intergovernmental Organization #
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# or submit itself to any jurisdiction. #
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###############################################################################
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"""
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Lines to select the decay D*+ -> D0 pi+ with D0 -> KS0 KS0 and KS0 -> pi+ pi-.
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The KS0 can be reconstructed either from long, downstream or upstream track, resulting
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in the combinations LLLL, LLLD, LLDD, LDDD, DDDD, ULLL, ULDD.
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"""
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import Functors as F
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from Functors.math import in_range
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from GaudiKernel.SystemOfUnits import MeV, mm, GeV
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from Moore.config import register_line_builder
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from Moore.lines import Hlt2Line
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from RecoConf.reconstruction_objects import make_pvs
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from Hlt2Conf.standard_particles import make_down_pions, make_long_pions, make_up_pions
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from Hlt2Conf.algorithms import ParticleContainersMerger
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from Hlt2Conf.algorithms_thor import (ParticleCombiner, ParticleFilter)
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from Hlt2Conf.lines.charm.particle_properties import _KS_M
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from Hlt2Conf.lines.charm.prefilters import charm_prefilters
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#####################################################################
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### Shortcuts for filters and builders used throughout the module ###
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#####################################################################
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def make_tagging_pions():
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return ParticleFilter(
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make_long_pions(),
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F.FILTER(F.require_all(F.PT > 200 * MeV, F.P > 1 * GeV)),
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)
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def _make_long_pions_from_ks():
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return ParticleFilter(
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make_long_pions(),
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F.FILTER(F.MINIPCHI2CUT(IPChi2Cut=36., Vertices=make_pvs())))
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def _make_down_pions_from_ks():
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return ParticleFilter(
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make_down_pions(),
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F.FILTER(F.require_all(F.PT > 175 * MeV, F.P > 3000 * MeV)))
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def _make_down_pions_from_ks_LD():
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return ParticleFilter(
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make_down_pions(),
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F.FILTER(F.require_all(F.PT > 100 * MeV, F.P > 2000 * MeV)))
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def _make_up_pions_from_ks():
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return ParticleFilter(
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make_up_pions(),
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F.FILTER(F.MINIPCHI2CUT(IPChi2Cut=10., Vertices=make_pvs())))
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def _make_ll_ks(descriptor="KS0 -> pi+ pi-"):
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"""Returns maker for KS0 -> pi+ pi- constructed with two long pions."""
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return ParticleCombiner(
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[_make_long_pions_from_ks(),
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_make_long_pions_from_ks()],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Ks_LL_{hash}',
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CombinationCut=F.require_all(
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in_range(_KS_M - 50 * MeV, F.MASS, _KS_M + 50 * MeV),
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F.PT > 450 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(_KS_M - 30 * MeV, F.MASS, _KS_M + 30 * MeV),
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F.CHI2DOF < 7,
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in_range(-100 * mm, F.END_VZ, 500 * mm),
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F.PT > 500 * MeV,
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),
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)
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def _make_ll_ks_ULLL(descriptor="KS0 -> pi+ pi-"):
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"""Returns maker for KS0 -> pi+ pi- constructed with two long pions only for ULLL."""
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return ParticleCombiner(
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[_make_long_pions_from_ks(),
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_make_long_pions_from_ks()],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Ks_LL_ULLL_{hash}',
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CombinationCut=F.require_all(
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in_range(_KS_M - 50 * MeV, F.MASS, _KS_M + 50 * MeV),
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F.PT > 250 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(_KS_M - 30 * MeV, F.MASS, _KS_M + 30 * MeV),
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F.CHI2DOF < 7,
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in_range(-100 * mm, F.END_VZ, 500 * mm),
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F.PT > 300 * MeV,
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),
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)
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def _make_ld_ks(descriptor="KS0 -> pi+ pi-"):
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"""Returns maker for KS0 -> pi+ pi- constructed with a long and downstream pion."""
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return ParticleCombiner(
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[_make_long_pions_from_ks(),
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_make_down_pions_from_ks_LD()],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Ks_LD_{hash}',
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CombinationCut=F.require_all(
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in_range(_KS_M - 85 * MeV, F.MASS, _KS_M + 85 * MeV),
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F.PT > 450 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(_KS_M - 65 * MeV, F.MASS, _KS_M + 65 * MeV),
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F.CHI2DOF < 10,
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in_range(50 * mm, F.END_VZ, 500 * mm),
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F.PT > 500 * MeV,
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),
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)
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def _make_dd_ks(descriptor="KS0 -> pi+ pi-"):
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"""Returns maker for KS0 -> pi+ pi- constructed with two downstream pions."""
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return ParticleCombiner(
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[_make_down_pions_from_ks(),
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_make_down_pions_from_ks()],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Ks_DD_{hash}',
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CombinationCut=F.require_all(
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in_range(_KS_M - 80 * MeV, F.MASS, _KS_M + 80 * MeV),
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F.PT > 450 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(_KS_M - 60 * MeV, F.MASS, _KS_M + 60 * MeV),
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F.CHI2DOF < 10,
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in_range(300 * mm, F.END_VZ, 2275 * mm),
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F.PT > 500 * MeV,
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),
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)
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def _make_ul_ks(descriptor="KS0 -> pi+ pi-"):
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"""Returns maker for KS0 -> pi+ pi- constructed with one long and one upstream pion."""
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return ParticleCombiner(
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[_make_up_pions_from_ks(),
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_make_long_pions_from_ks()],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Ks_UL_{hash}',
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CombinationCut=F.require_all(
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in_range(_KS_M - 90 * MeV, F.MASS, _KS_M + 90 * MeV),
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F.PT < 5050 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(_KS_M - 70 * MeV, F.MASS, _KS_M + 70 * MeV),
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F.CHI2DOF < 10,
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in_range(-100 * mm, F.END_VZ, 500 * mm),
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F.PT > 400 * MeV,
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),
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)
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def _make_dstars(dzeros, pions, descriptor):
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"""Returns maker for D*+- -> D0 pi+-."""
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return ParticleCombiner(
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[dzeros, pions],
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DecayDescriptor=descriptor,
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name='Charm_D0ToKsKs_Dstars_{hash}',
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CombinationCut=F.MASS - F.CHILD(1, F.MASS) < 160 * MeV,
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CompositeCut=F.require_all(
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F.MASS - F.CHILD(1, F.MASS) < 150 * MeV,
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F.CHI2DOF < 25, # fix due to control channel
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),
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)
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#########################
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### Lines definition ###
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#########################
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all_lines = {}
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@register_line_builder(all_lines)
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def dst_to_d0pi_d0toksks_llll(
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name="Hlt2Charm_DstpToD0Pip_D0ToKsKs_LLLL"):
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pvs = make_pvs()
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kshorts = _make_ll_ks()
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dzeros = ParticleCombiner(
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[kshorts, kshorts],
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DecayDescriptor="D0 -> KS0 KS0",
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name="Charm_D0ToKsKs_D0ToKsKs_LLLL",
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CombinationCut=F.require_all(
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in_range(1730 * MeV, F.MASS, 2000 * MeV),
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F.SUM(F.PT) > 1500 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(1775 * MeV, F.MASS, 1955 * MeV),
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F.BPVFDCHI2(pvs) > 5,
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F.CHI2DOF < 10, # fix
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F.BPVDIRA(pvs) > 0.9994,
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),
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)
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pitag = make_tagging_pions()
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dstarp = _make_dstars(dzeros, pitag, "D*(2010)+ -> D0 pi+")
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dstarm = _make_dstars(dzeros, pitag, "D*(2010)- -> D0 pi-")
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dstars = ParticleContainersMerger([dstarp, dstarm])
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return Hlt2Line(
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name=name, algs=charm_prefilters() + [kshorts, dzeros, dstars])
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@register_line_builder(all_lines)
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def dst_to_d0pi_d0toksks_llld_line(
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name="Hlt2Charm_DstpToD0Pip_D0ToKsKs_LLLD"):
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pvs = make_pvs()
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ll_kshorts = _make_ll_ks()
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ld_kshorts = _make_ld_ks()
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dzeros = ParticleCombiner(
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[ll_kshorts, ld_kshorts],
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DecayDescriptor="D0 -> KS0 KS0",
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name="Charm_D0ToKsKs_D0ToKsKs_LLLD",
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AllowDiffInputsForSameIDChildren=True,
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CombinationCut=F.require_all(
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in_range(1730 * MeV, F.MASS, 2000 * MeV),
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F.SUM(F.PT) > 1500 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(1775 * MeV, F.MASS, 1955 * MeV),
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F.CHI2DOF < 10,
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F.BPVDIRA(pvs) > 0.9994,
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),
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)
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pitag = make_tagging_pions()
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dstarp = _make_dstars(dzeros, pitag, "D*(2010)+ -> D0 pi+")
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dstarm = _make_dstars(dzeros, pitag, "D*(2010)- -> D0 pi-")
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dstars = ParticleContainersMerger([dstarp, dstarm])
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return Hlt2Line(name=name, algs=charm_prefilters() + [ld_kshorts, dzeros, dstars])
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@register_line_builder(all_lines)
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def dst_to_d0pi_d0toksks_lldd(
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name="Hlt2Charm_DstpToD0Pip_D0ToKsKs_LLDD"):
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pvs = make_pvs()
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dd_kshorts = _make_dd_ks()
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ll_kshorts = _make_ll_ks()
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dzeros = ParticleCombiner(
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[dd_kshorts, ll_kshorts],
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DecayDescriptor="D0 -> KS0 KS0",
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AllowDiffInputsForSameIDChildren=True,
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name="Charm_D0ToKsKs_D0ToKsKs_LLDD",
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CombinationCut=F.require_all(
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in_range(1730 * MeV, F.MASS, 2000 * MeV),
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F.SUM(F.PT) > 1500 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(1775 * MeV, F.MASS, 1955 * MeV),
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F.CHI2DOF < 10,
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F.BPVDIRA(pvs) > 0.9994,
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),
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)
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pitag = make_tagging_pions()
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dstarp = _make_dstars(dzeros, pitag, "D*(2010)+ -> D0 pi+")
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dstarm = _make_dstars(dzeros, pitag, "D*(2010)- -> D0 pi-")
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dstars = ParticleContainersMerger([dstarp, dstarm])
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return Hlt2Line(
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name=name, algs=charm_prefilters() + [dd_kshorts, dzeros, dstars])
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@register_line_builder(all_lines)
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def dst_to_d0pi_d0toksks_dddd(
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name="Hlt2Charm_DstpToD0Pip_D0ToKsKs_DDDD"):
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pvs = make_pvs()
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dd_kshorts = _make_dd_ks()
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dzeros = ParticleCombiner(
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[dd_kshorts, dd_kshorts],
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DecayDescriptor="D0 -> KS0 KS0",
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name="Charm_D0ToKsKs_D0ToKsKs_DDDD",
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CombinationCut=F.require_all(
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in_range(1730 * MeV, F.MASS, 2000 * MeV),
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F.SUM(F.PT) > 1500 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(1775 * MeV, F.MASS, 1955 * MeV),
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F.CHI2DOF < 10,
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F.BPVDIRA(pvs) > 0.9994,
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),
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)
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pitag = make_tagging_pions()
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dstarp = _make_dstars(dzeros, pitag, "D*(2010)+ -> D0 pi+")
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dstarm = _make_dstars(dzeros, pitag, "D*(2010)- -> D0 pi-")
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dstars = ParticleContainersMerger([dstarp, dstarm])
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return Hlt2Line(
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name=name, algs=charm_prefilters() + [dd_kshorts, dzeros, dstars])
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@register_line_builder(all_lines)
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def dst_to_d0pi_d0toksks_ulll(
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name="Hlt2Charm_DstpToD0Pip_D0ToKsKs_ULLL"):
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pvs = make_pvs()
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ll_kshorts = _make_ll_ks_ULLL()
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ul_kshorts = _make_ul_ks()
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dzeros = ParticleCombiner(
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[ll_kshorts, ul_kshorts],
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DecayDescriptor="D0 -> KS0 KS0",
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name="Charm_D0ToKsKs_D0ToKsKs_ULLL",
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AllowDiffInputsForSameIDChildren=True,
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CombinationCut=F.require_all(
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in_range(1730 * MeV, F.MASS, 2000 * MeV),
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F.SUM(F.PT) > 1500 * MeV,
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),
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CompositeCut=F.require_all(
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in_range(1775 * MeV, F.MASS, 1955 * MeV),
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F.CHI2DOF < 10,
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F.BPVDIRA(pvs) > 0.9994,
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),
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)
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pitag = make_tagging_pions()
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dstarp = _make_dstars(dzeros, make_tagging_pions(), "D*(2010)+ -> D0 pi+")
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dstarm = _make_dstars(dzeros, make_tagging_pions(), "D*(2010)- -> D0 pi-")
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dstars = ParticleContainersMerger([dstarp, dstarm])
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return Hlt2Line(
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name=name, algs=charm_prefilters() + [ul_kshorts, dzeros, dstars])
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