FASER Monte Carlo Samples

Overview

FASER MC samples are separated into different production epochs, representing particular detector configurations or releases. These samples can be found on EOS at CERN under /eos/experiment/faser/sim. The different output types are each in different subdirectories as shown here. Log files are also being saved for now.

Subdirectory	Type	Description
sim	HITS	Output of Geant4 simulation, starting point for digitization
ntp	NTUP	G4 hits and MC truth in the emulsion (for FASERnu reco)
rdo	RDO	Raw Data Object, output of digitization, starting point for MC reconstruction
rec	xAOD	Reconstructed data. Note both real data and simulated data will be found here
phy	NTUP	PhysicsNtuples - flat ntuples intended to make analyses easier to get started

To save disk space on the eos drive, some of the larger hits files have been moved to /eos/experiment/fasernu-data0/faser/sim. Wherever possible we have tried to avoid deleting samples.

Releases

Description of code releases can be found at FaserReleases. For more details, you can also look at the gitlab releases page.

MC22 Production

Samples produced to support physics analyses for 2022 data in Winter 2023. Samples are found in the /eos/experiment/faser/sim/mc22 directory. Each major generator has its own subdirectory, followed by run number and tag.

Latest Simulation Release: s0010 (19 Feb, 2023)

Latest Reconstruction Release: r0014 (27 Feb, 2023)

Note, there is no practical difference between simulation releases s0009 and s0008. There is a code speedup for the calorimeter digitization and a number of script improvements, but the samples should be interchangeable in content. Simulation release s0010 brings a fix for the buggy calorimeter digitization, and a workaround for the tracker digitization timing. For samples produced upstream of FASERnu, this timing fix in particular is important.

As there is now an ambiguity for different simulation releases being reconstructed by r0013 or later, the output directories are now being extended to show both the simulation and reconstruction tag, so for instance, s0010-r0013. In some cases, where there is no ambiguity, the simulation tag is not being written in the directory (although it is always in the output file name).

The reconstruction release r0014 is mainly an update to the physics ntuple format, although there is also a difference in the calorimeter energy scale applied to Monte Carlo samples that is relevant for the dark photon analysis.

Particle Gun Samples

These are diagnostic samples with single particles produced in a range of phase space through the detector. All samples (unless noted otherwise) are simulated with the optical filters inserted and with low gain settings for the calorimeter, which is the nominal physics configuration. All muon samples have high gain settings by default. These samples are found in the /eos/experiment/faser/sim/mc22/particle_gun subdirectory. Configuration files for producing these samples can be found on git. Note, this is a different package in git than for the MDC.

Samples starting in the decay volume

All muon samples are digitized with high gain settings (with filters) in the calorimeter. All other samples use low gain settings (with filters) unless specified otherwise.

Run Number	Short Description	Events	Description
100000	MC22_PG_muon_logE	100k	muons with log energy distribution from 10 to 5000 GeV
100001	MC22_PG_muon_30GeV	25k	muons at 30 GeV
100002	MC22_PG_muon_100GeV	25k	muons at 100 GeV
100003	MC22_PG_muon_300GeV	25k	muons at 300 GeV
100004	MC22_PG_muon_1000GeV	25k	muons at 1000 GeV
100005	MC22_PG_mupl_overlay	100k	mu plus starting at z=0 generated with the overlay energy/angle spectrum
100006	MC22_PG_mumi_overlay	100k	mu minus starting at z=0 generated with the overlay energy/angle spectrum
100020	MC22_PG_elec_logE	40k	electrons with log energy distribution from 10 to 5000 GeV
100021	MC22_PG_elec_30GeV	20k	electrons at 30 GeV
100022	MC22_PG_elec_100GeV	20k	electrons at 100 GeV
100023	MC22_PG_elec_300GeV	20k	electrons at 300 GeV
100024	MC22_PG_elec_1000GeV	10k	electrons at 1000 GeV
100070	MC22_PG_kshort_logE	20k	K Short Decay In Flight, produced at a range of z positions in decay volume

Samples starting upstream of FASERnu

These samples are produced starting in the concrete upstream of FASERnu. All muon samples are digitized with high gain settings (with filters) in the calorimeter. All other samples use low gain settings (with filters) unless specified otherwise. Samples starting upstream of FASERnu also have the emulsion hit ntuple produced as part of the processing. These ntuples can be found in the ntp directory, so for example: /eos/experiment/faser/sim/mc22/particle_gun/100010/ntp/s0008.

Run Number	Short Description	Events	Description
100010	MC22_PG_muon_fasernu_10GeV	25k	muons at 10 GeV
100011	MC22_PG_muon_fasernu_30GeV	25k	muons at 30 GeV
100012	MC22_PG_muon_fasernu_100GeV	25k	muons at 100 GeV
100013	MC22_PG_muon_fasernu_300GeV	25k	muons at 300 GeV
100014	MC22_PG_muon_fasernu_1000GeV	25k	muons at 1000 GeV
100015	MC22_PG_muon_fasernu_logE	100k	muons with log energy distribution from 10 to 5000 GeV
100040	MC22_PG_muon_fasernu_narrow_logE	1M	Produced in a narrow generation range (2.5 cm) producing high density muons in FaserNu
100041	MC22_PG_mumi_fasernu_flukaE	5M	mu minus produced with Fluka energy spectrum, low-gain filter-in calo settings
100042	MC22_PG_mupl_fasernu_flukaE	5M	mu plus produced with Fluka energy spectrum, low-gain filter-in calo settings
100043	MC22_PG_mumi_fasernu_5mrad_flukaE	5M	mu minus produced with Fluka energy spectrum, low-gain filter-in calo settings, wider 5mrad angular divergence
100044	MC22_PG_mupl_fasernu_5mrad_flukaE	5M	mu plus produced with Fluka energy spectrum, low-gain filter-in calo settings, wider 5mrad angular divergence

Samples starting in FASERnu

These samples are intended to mimic charged-current interactions and otherwise provide samples for comparison to neutrino events. These samples are generated uniformly between -2990mm and -1951 in FASER z coordinate. These samples all use low gain settings (with filters) in the calorimeter, and the FASERnu hits ntuple is produced. All of these samples were produced with a gaussian 1 mRad polar angle distribution.

Run Number	Short Description	Events	Description
100030	MC22_PG_pion_in_fasernu_10GeV	20k	pions at 10 GeV
100031	MC22_PG_pion_in_fasernu_30GeV	20k	pions at 30 GeV
100032	MC22_PG_pion_in_fasernu_100GeV	20k	pions at 100 GeV
100033	MC22_PG_pion_in_fasernu_300GeV	20k	pions at 300 GeV
100034	MC22_PG_pion_in_fasernu_1000GeV	10k	pions at 1 TeV
100050	MC22_PG_muon_in_fasernu_10GeV	20k	muons at 10 GeV
100051	MC22_PG_muon_in_fasernu_30GeV	20k	muons at 30 GeV
100052	MC22_PG_muon_in_fasernu_100GeV	20k	muons at 100 GeV
100053	MC22_PG_muon_in_fasernu_300GeV	20k	muons at 300 GeV
100054	MC22_PG_muon_in_fasernu_1000GeV	10k	muons at 1 TeV
100060	MC22_PG_neut_in_fasernu_logE	80k	neutrons (and anti-neutrons) with a log energy spectrum from 10 GeV to 500 GeV
100061	MC22_PG_kshort_in_fasernu_logE	80k	K-short (and anti-particle) with a log energy spectrum from 10 GeV to 500 GeV
100062	MC22_PG_klong_in_fasernu_logE	80k	K-long (and anti-particle) with a log energy spectrum from 10 GeV to 500 GeV
100063	MC22_PG_kshort_plus_m2400_xin	100k	K-short from mu+, starting at -2.4m (near end of FASERnu), Xin spectrum
100064	MC22_PG_kshort_minus_m2400_xin	100k	K-short from mu-, starting at -2.4m (near end of FASERnu), Xin spectrum
100065	MC22_PG_klong_plus_m2400_xin	100k	K-long from mu+, starting at -2.4m (near end of FASERnu), Xin spectrum
100066	MC22_PG_klong_minus_m2400_xin	100k	K-long from mu-, starting at -2.4m (near end of FASERnu), Xin spectrum

100067	MC22_PG_kshort_in_fasernu_xin	200k	K-short in FASERnu, using 2D energy-angle sampling from Xin
100068	MC22_PG_klong_in_fasernu_xin	200k	K-long in FASERnu, using 2D energy-angle sampling from Xin
100069	MC22_PG_neut_in_fasernu_xin	200k	neutrons in FASERnu, using 2D energy-angle sampling from Xin
100074	MC22_PG_lambda_in_fasernu_xin	200k	Lambda in FASERnu, using 2D energy-angle sampling from Xin
100075	MC22_PG_aneut_in_fasernu_xin	200k	anti-neutrino in FASERnu, using 2D energy-angle sampling from Xin
100076	MC22_PG_alambda_in_fasernu_xin	200k	anti-Lambda in FASERnu, using 2D energy-angle sampling from Xin

Other samples

To test the energy loss in the rest of FASER, these samples are simulated just upstream of the third tracking station.

Run Number	Short Description	Events	Description
100025	MC22_PG_elec_st3_100GeV	10k	electrons produced at +2m with 100 GeV

To test conversions, these samples are produced in the veto counter material

Run Number	Short Description	Events	Description
100071	MC22_PG_gamma_veto_logE	5k	photons produced around -1.65m with log energy from 5-100 GeV
100072	MC22_PG_gamma_veto_histE	50k	photons produced around -1.65m with conversion energy spectrum
100073	MC22_PG_gamma_histE	50k	photons produced around -0.5m (in decay volume) with conversion energy spectrum

To test backgrounds missing the veto counter, these were produced with FLUKA energy spectrum at z=3.75m with high incidence angle.

Run Number	Short Description	Events	Description
100080	MC22_PG_mupl_offset_fluka	200k	mu+ at high incidence angle to miss veto
100081	MC22_PG_mumi_offset_fluka	200k	mu- at high incidence angle to miss veto
100082	MC22_PG_mupl_offset_15mra_fluka	200k	mu+ with reduced angle from 15-30 mRad
100083	MC22_PG_mumi_offset_15mrad_fluka	200k	mu- with reduced angle from 15-30 mRad

Foresee Dark Photon Samples

These are dark photon signal samples produced in the FASER decay volume. All samples (unless otherwise noted) are simulated with the optical filters inserted and with low gain settings for the calorimeter, which is the nominal physics configuration. These samples are found in the /eos/experiment/faser/sim/mc22/foresee subdirectory. Configuration files for producing these samples can be found on git. Cross section information can be found at /eos/experiment/faser/gen/MC22/DarkPhoton/DarkPhotonGrid13p6_65mm/cross-sections.json.

The first three samples below are equivalent to the MDC samples.

Run Number	Short Description	Events	Description
110033	MC22_FS_Aee_010MeV_1Em5	20k	10 MeV dark photon to e+e-, epsilon = 1E-5
110038	MC22_FS_Aee_100MeV_1Em5	20k	100 MeV dark photon to e+e-, epsilon = 1E-5
110051	MC22_FS_Aee_010MeV_1Em4	20k	10 MeV dark photon to e+e-, epsilon = 1E-4
110026	MC22_FS_Aee_010MeV_5Em6	20k	10 MeV dark photon to e+e-, epsilon = 5E-6
110040	MC22_FS_Aee_010MeV_3Em5	20k	10 MeV dark photon to e+e-, epsilon = 3E-5
110047	MC22_FS_Aee_010MeV_5Em5	20k	10 MeV dark photon to e+e-, epsilon = 5E-5
110054	MC22_FS_Aee_010MeV_3Em4	20k	10 MeV dark photon to e+e-, epsilon = 3E-4
110058	MC22_FS_Aee_013MeV_1Em4	5k	13 MeV dark photon to e+e-, epsilon = 1E-4
110056	MC22_FS_Aee_013MeV_3Em4	5k	13 MeV dark photon to e+e-, epsilon = 3E-4
110060	MC22_FS_Aee_016MeV_5Em5	5k	16 MeV dark photon to e+e-, epsilon = 5E-5
110059	MC22_FS_Aee_016MeV_1Em4	5k	16 MeV dark photon to e+e-, epsilon = 1E-4
110057	MC22_FS_Aee_016MeV_3Em4	5k	16 MeV dark photon to e+e-, epsilon = 3E-4
110022	MC22_FS_Aee_025MeV_1Em6	20k	25 MeV dark photon to e+e-, epsilon = 1E-6
110027	MC22_FS_Aee_025MeV_5Em6	20k	25 MeV dark photon to e+e-, epsilon = 5E-6
110034	MC22_FS_Aee_025MeV_1Em5	20k	25 MeV dark photon to e+e-, epsilon = 1E-5
110041	MC22_FS_Aee_025MeV_3Em5	20k	25 MeV dark photon to e+e-, epsilon = 3E-5
110048	MC22_FS_Aee_025MeV_5Em5	20k	25 MeV dark photon to e+e-, epsilon = 5E-5
110052	MC22_FS_Aee_025MeV_1Em4	20k	25 MeV dark photon to e+e-, epsilon = 1E-4
110055	MC22_FS_Aee_025MeV_3Em4	20k	25 MeV dark photon to e+e-, epsilon = 3E-4
110063	MC22_FS_Aee_032MeV_3Em5	5k	32 MeV dark photon to e+e-, epsilon = 3E-5
110061	MC22_FS_Aee_032MeV_5Em5	5k	32 MeV dark photon to e+e-, epsilon = 5E-5
110064	MC22_FS_Aee_036MeV_3Em5	5k	36 MeV dark photon to e+e-, epsilon = 3E-5
110062	MC22_FS_Aee_036MeV_5Em5	5k	36 MeV dark photon to e+e-, epsilon = 5E-5
110023	MC22_FS_Aee_050MeV_1Em6	20k	50 MeV dark photon to e+e-, epsilon = 1E-6
110028	MC22_FS_Aee_050MeV_5Em6	20k	50 MeV dark photon to e+e-, epsilon = 5E-6
110035	MC22_FS_Aee_050MeV_1Em5	20k	50 MeV dark photon to e+e-, epsilon = 1E-5
110073	MC22_FS_Aee_050MeV_2Em5	5k	50 MeV dark photon to e+e-, epsilon = 2E-5
110042	MC22_FS_Aee_050MeV_3Em5	20k	50 MeV dark photon to e+e-, epsilon = 3E-5
110049	MC22_FS_Aee_050MeV_5Em5	20k	50 MeV dark photon to e+e-, epsilon = 5E-5
110053	MC22_FS_Aee_050MeV_1Em4	20k	50 MeV dark photon to e+e-, epsilon = 1E-4
110024	MC22_FS_Aee_063MeV_1Em6	20k	63 MeV dark photon to e+e-, epsilon = 1E-6
110029	MC22_FS_Aee_063MeV_5Em6	20k	63 MeV dark photon to e+e-, epsilon = 5E-6
110036	MC22_FS_Aee_063MeV_1Em5	20k	63 MeV dark photon to e+e-, epsilon = 1E-5
110074	MC22_FS_Aee_063MeV_2Em5	5k	63 MeV dark photon to e+e-, epsilon = 2E-5
110043	MC22_FS_Aee_063MeV_3Em5	20k	63 MeV dark photon to e+e-, epsilon = 3E-5
110050	MC22_FS_Aee_063MeV_5Em5	20k	63 MeV dark photon to e+e-, epsilon = 5E-5
110025	MC22_FS_Aee_079MeV_1Em6	20k	79 MeV dark photon to e+e-, epsilon = 1E-6
110030	MC22_FS_Aee_079MeV_5Em6	20k	79 MeV dark photon to e+e-, epsilon = 5E-6
110037	MC22_FS_Aee_079MeV_1Em5	20k	79 MeV dark photon to e+e-, epsilon = 1E-5
110075	MC22_FS_Aee_079MeV_2Em5	5k	79 MeV dark photon to e+e-, epsilon = 2E-5
110044	MC22_FS_Aee_079MeV_3Em5	20k	79 MeV dark photon to e+e-, epsilon = 3E-5
110031	MC22_FS_Aee_100MeV_5Em6	20k	100 MeV dark photon to e+e-, epsilon = 5E-6
110045	MC22_FS_Aee_100MeV_3Em5	20k	100 MeV dark photon to e+e-, epsilon = 3E-5
110032	MC22_FS_Aee_112MeV_5Em6	20k	112 MeV dark photon to e+e-, epsilon = 5E-6
110039	MC22_FS_Aee_112MeV_1Em5	20k	112 MeV dark photon to e+e-, epsilon = 1E-5
110046	MC22_FS_Aee_112MeV_3Em5	20k	112 MeV dark photon to e+e-, epsilon = 3E-5
110090	MC22_FS_Aee_010MeV_15Em5	5k	10 MeV dark photon to e+e-, epsilon = 1.5E-4
110091	MC22_FS_Aee_013MeV_15Em5	5k	13 MeV dark photon to e+e-, epsilon = 1.5E-4
110092	MC22_FS_Aee_016MeV_15Em5	5k	16 MeV dark photon to e+e-, epsilon = 1.5E-4
110093	MC22_FS_Aee_025MeV_15Em5	5k	25 MeV dark photon to e+e-, epsilon = 1.5E-4

Foresee ALPs Samples

These are axion-like particle signal samples produced in the FASER decay volume. All samples (unless otherwise noted) are simulated with the optical filters inserted and with low gain settings for the calorimeter, which is the nominal physics configuration. These samples are found in the /eos/experiment/faser/sim/mc22/foresee subdirectory. Configuration files for producing these samples can be found on git. These are divided between photon coupling samples (where g is the coupling for agg) and W-dominated samples (where g is aWW).

Run Number	Short Description	Events	Description
110100	MC22_FS_Alp_060MeV_7Em5	5k	60 MeV ALPs to gamma-gamma, g_agg = 7E-5
110101	MC22_FS_Alp_060MeV_15Em5	5k	60 MeV ALPs to gamma-gamma, g_agg = 1.5E-4
110102	MC22_FS_Alp_060MeV_3Em4	5k	60 MeV ALPs to gamma-gamma, g_agg = 3E-4
110200	MC22_FS_Alpw_200MeV_1Em5	5k	200 MeV ALPs to gamma-gamma, g_aww = 1E-5
110201	MC22_FS_Alpw_200MeV_4Em5	5k	200 MeV ALPs to gamma-gamma, g_aww = 4E-5
110202	MC22_FS_Alpw_200MeV_2Em4	5k	200 MeV ALPs to gamma-gamma, g_aww = 2E-4

Genie Neutrino Samples

These are neutrino signal samples produced by Genie. All samples (unless otherwise noted) are simulated with the optical filters inserted and with low gain settings for the calorimeter, which is the nominal physics configuration. These samples are found in the /eos/experiment/faser/sim/mc22/genie subdirectory. Configuration files for producing these samples can be found on git.

Run Number	Short Description	Events	Description
200003	MC22_Genie_all_600invfb_v1	~422k	600 fb-1 of neutrino interactions with all neutrino species
200004	MC22_Genie_timingTrackOnly_20invab	2099	20 ab-1 of neutrino interactions starting downstream of the decay volume
200005	MC22_Genie_timingTrackOnly_300invab	30653	300 ab-1 of neutrino interactions starting downstream of the decay volume

Fluka Muon Samples

These samples come from a FLUKA simulation that has been resampled and scattered through roughly 100m of rock before entering FASER. There are two variants of this resampling. The older one (also used in the MDC) propagated the muons to -3.75 m, missing the concrete in the trench. Newer samples have been made propagating the muons to -4.99 m, which includes all of the concrete in the trench in the FASER G4 geometry.

Note that these samples contain weighted events, and that the event weight stored in the HepMC::GenEvent or xAOD::TruthEvent must be applied to obtain physical distributions. The physics ntuple contains this FLUKA weight.

These samples are found in the /eos/experiment/faser/sim/mc22/fluka subdirectory. Configuration files for producing these samples can be found on git.

Run Number	Short Description	Events	Description
210001	MC22_Fluka_unit30_Nm_71m_m3750_v3	200k	Test sample with old four-vectors
210002	MC22_Fluka_unit30_Pm_71m_m3750_v3	200k	Test sample with old four-vectors
210003	MC22_Fluka_unit30_Nm_71m_m4990_v3	1352.2k	Muons start too far upstream, do not use!
210004	MC22_Fluka_unit30_Pm_71m_m4990_v3	796.3k	Muons start too far upstream, do not use!
210005	MC22_Fluka_unit30_Nm_71m_m3990_v3	1352.2k	mu- starting in concrete upstream of FASERnu
210006	MC22_Fluka_unit30_Pm_71m_m3990_v3	796.3k	mu+ starting in concrete upstream of FASERnu

Mock Data Challenge

MDC samples are not intended to be used for physics results. These samples were produced with a "good enough" code release intended to start FASER physics analysis efforts. For each data type, these will be found in the /eos/experiment/faser/sim/mdc subdirectory. Each major generator has its own subdirectory, followed by the run number and data type. The reconstructed data is found in the rec subdirectory, followed by the reconstruction tag version.

Latest Simulation Release: s0007 (30 Jul, 2022)

Latest Reconstruction Release: r0009 (4 Aug, 2022)

Particle Gun Samples

These are diagnostic samples with single particles produced in a range of phase space through the detector. Particles typically start in the decay volume (downstream of the Veto counters) generated uniformly over a circle of radius 10cm with a 5 mRad gaussian angular divergence. One muons sample starts in the rock before the emulsion detector, and a few samples have a narrower range of spatial production and angular divergence. These samples are found in the /eos/experiment/faser/sim/mdc/particle_gun subdirectory. Configuration files for producing these samples can be found on git (but be carful to select the proper release). Instruction for producing samples can be found on the MdcProduction page.

Samples starting in the decay volume

Latest Release: s0007_r0009

Run Number	Short Description	Events	Description
101101	MDC_PG_elec_logE	20k	electrons with log energy distribution from 10 to 5000 GeV
101103	MDC_PG_elec_100GeV	20k	electrons at 100 GeV
101104	MDC_PG_elec_100GeV	20k	electrons at 100 GeV, narrower generation parameters (2 cm radius, 1 mRad divergence)
101105	MDC_PG_elec_50GeV	20k	electrons at 50 GeV
101106	MDC_PG_elec_200GeV	20k	electrons at 200 GeV
101301	MDC_PG_muon_logE	20k	muons with a log energy distribution from 10 to 5000 GeV, start in decay volume, high calo gain from s0005
101303	MDC_PG_muon_100GeV	20k	muons at 100 GeV, start in decay volume, high calo gain from s0005
101304	MDC_PG_muon_100GeV	20k	muons at 100 GeV, start in decay volume, narrower generation parameters (2 cm radius, 1 mRad divergence), high calo gain from s0005
102201	MDC_PG_gam_100GeV	20k	photons at 100 GeV
121101	MDC_PG_pion_100GeV	20k	pions at 100 GeV starting in the decay volume

Samples starting upstream of FASERnu

Latest Release: r0010_r0010

Run Number	Short Description	Events	Description
101302	MDC_PG_muon_fasernu_logE	50k	muons with a log energy distribution from 10 to 5000 GeV, start in concrete before FaserNu
101305	MDC_PG_muon_fasernu_higain_logE	50k	like 101302 but with high gain settings for calorimeter
101306	MDC_PG_muon_fasernu_logE	4M	Like 101301, but narrow generation range (2.5 mm) producing high density muons in FaserNu
101307	MDC_PG_muon_fasernu_logE	4M	Like 101306, but correct narrow generation range (2.5 cm) producing high density muons in FaserNu
101308	MDC_PG_muon_fasernu_10GeV	20k	Same parameters as 101307 but fixed incident energy
101309	MDC_PG_muon_fasernu_30GeV	20k	Same parameters as 101307 but fixed incident energy
101310	MDC_PG_muon_fasernu_100GeV	20k	Same parameters as 101307 but fixed incident energy
101311	MDC_PG_muon_fasernu_300GeV	20k	Same parameters as 101307 but fixed incident energy
101312	MDC_PG_muon_fasernu_1000GeV	20k	Same parameters as 101307 but fixed incident energy
121102	MDC_PG_pion_fasernu_10GeV	20k	Same parameters as 101307 but pions at fixed incident energy
121103	MDC_PG_pion_fasernu_30GeV	20k	Same parameters as 101307 but pions at fixed incident energy
121104	MDC_PG_pion_fasernu_100GeV	20k	Same parameters as 101307 but pions at fixed incident energy
121105	MDC_PG_pion_fasernu_300GeV	20k	Same parameters as 101307 but pions at fixed incident energy
121106	MDC_PG_pion_fasernu_1000GeV	10k	Same parameters as 101307 but pions at fixed incident energy

Foresee Signal Samples

These are signal samples with production kinematics provided by Foresee. Generated samples are now produced and written as hepmc files (including parent decay in the FASER decay volume) and then simulated by Geant4. These samples are found in the /eos/experiment/faser/sim/mdc/foresee directory. Note the s0005_r0008 samples had no in-time tracker hits and have been removed.

Latest Release: s0007_r0009

Run Number	Short Description	Events	Description
110001	MDC_FS_Aee_100MeV_1Em5	20k	100 MeV dark photon to e+e-, epsilon = 1E-5
110002	MDC_FS_Aee_10MeV_1Em5	20k	10 MeV dark photon to e+e-, epsilon = 1E-5
110003	MDC_FS_Aee_10MeV_1Em4	20k	10 MeV dark photon to e+e-, epsilon = 1E-4
110004	MDC_FS_Amm_316MeV_2Em6	20k	316 MeV dark photon to mu+mu-, epsilon = 2E-6
110005	MDC_FS_Alp_10MeV_1Em4	20k	10 MeV ALP to photons, epsilon = 1E-4
110006	MDC_FS_Alp_10MeV_1Em2	20k	10 MeV ALP to photons, epsilon = 1E-2
110007	MDC_FS_Alp_100MeV_1Em4	20k	100 MeV ALP to photons, epsilon = 1E-4

The following samples were generated as a test with release s0006_r0008 to verify a fix to shift the Foresee production volume into the correct location in the FASER coordinate system. A different run number was used from the previous samples to avoid ambiguity in the eos directories. With the s0007, this fix has been incorporated into the runs listed above.

Run Number	Short Description	Events	Description
110011	MDC_FS_Aee_100MeV_1Em5_shift	20k	100 MeV dark photon to e+e-, epsilon = 1E-5
110012	MDC_FS_Aee_10MeV_1Em5_shift	20k	10 MeV dark photon to e+e-, epsilon = 1E-5
110013	MDC_FS_Aee_10MeV_1Em4_shift	20k	10 MeV dark photon to e+e-, epsilon = 1E-4
110014	MDC_FS_Amm_316MeV_2Em6_shift	20k	316 MeV dark photon to mu+mu-, epsilon = 2E-6
110015	MDC_FS_Alp_10MeV_1Em4_shift	20k	10 MeV ALP to photons, epsilon = 1E-4
110016	MDC_FS_Alp_10MeV_1Em2_shift	20k	10 MeV ALP to photons, epsilon = 1E-2
110017	MDC_FS_Alp_100MeV_1Em4_shift	20k	100 MeV ALP to photons, epsilon = 1E-4

Genie Neutrino Samples

These are neutrino samples generated by Genie with primary interactions in the FASERNu emulsion stack. These samples are found in the /eos/experiment/faser/sim/mdc/genie directory.

Latest Release: r0010

Run Number	Short Description	Events	Description
200001	MDC_Genie_all_150invfb_v1	~110k	150 fb-1 of neutrino interactions with all neutrino species, obsolete
200002	MDC_Genie_tauCC_1500invfb_v1	387	Tau neutrino CC interactions corresponding to 10x Run3 luminosity
200003	MDC_Genie_all_600invfb_v1	~422k	600 fb-1 of neutrino interactions with all neutrino species, includes events in 200001

FLUKA Muon Samples

Accelerator-produced muons as predicted by FLUKA. These samples are produced by taking the 4-vectors in the original FLUKA output and randomly smearing them for transport through ~100m of rock before the detector. This smearing is done using the Bethe-Bloch approximation and small-angle scattering approximation. Each initial 4-vector is sampled 10 times. These samples are found in the /eos/experiment/faser/sim/mdc/fluka directory.

Note that these samples contain weighted events, and that the event weight stored in the HepMC::GenEvent or xAOD::TruthEvent must be applied to obtain physical distributions.

Latest Release: s0007_r0009

Run Number	Short Description	Events	Description
210001	MDC_Fluka_unit30_Nm_71m_m3750_v3	1.35M	mu- FLUKA events, 50k per file
210002	MDC_Fluka_unit30_Pm_71m_m3750_v3	800k	mu+ FLUKA events, 50k per file

2021 Test Beam

These samples are produced using the test beam geometry with a particle gun starting at z=-1 m in front of the tracker plane. The initial samples were produced with a dev release, which is similar to s0007 and r0009 with some updates to accommodate the test beam geometry. Proper tagged versions will be produced once these are validated. These samples can be found in the /eos/experiment/faser/sim/tb21 subdirectory.

Run Number	Short Description	Events	Description
000100	FaserMC-TB_PG_muon_100GeV	40k	100 GeV muons, 10cm radius
000200	FaserMC-TB_PG_elec_100GeV	20k	100 GeV electrons, 10cm radius
000201	FaserMC-TB_PG_elec_50GeV	20k	50 GeV electrons, 10cm radius
000202	FaserMC-TB_PG_elec_30GeV	20k	30 GeV electrons, 10cm radius
000203	FaserMC-TB_PG_elec_200GeV	20k	200 GeV electrons, 10cm radius

-- EricTorrence - 2022-05-18