LHCf: very forward LHCf: very forward measurement of measurement of neutral particles neutral particles at LHC at LHC SAKO Takashi SAKO Takashi (for the LHCf collaboration) (for the LHCf collaboration) Solar-Terrestrial Environment Solar-Terrestrial Environment Laboratory, Laboratory, Nagoya University, Japan Nagoya University, Japan HERA and the LHC @ CERN 28-May-2008
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LHCf: very forward measurement of neutral particles at LHC
LHCf: very forward measurement of neutral particles at LHC. SAKO Takashi (for the LHCf collaboration) Solar-Terrestrial Environment Laboratory, Nagoya University, Japan. HERA and the LHC @ CERN 28-May-2008. Outline. HECR observations and interaction models - PowerPoint PPT Presentation
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LHCf: very forward LHCf: very forward measurement of measurement of
neutral particles at neutral particles at LHCLHC
SAKO TakashiSAKO Takashi(for the LHCf collaboration)(for the LHCf collaboration)
Nagoya University, JapanNagoya University, JapanHERA and the LHC @ CERN 28-May-2008
OutlineOutline
HECR observations and interaction HECR observations and interaction modelsmodels• GZK energy (absolute energy scale, GZK energy (absolute energy scale,
Pi zero produced at collision can be extracted by using gamma pair eventsPowerful to eliminate beam-gas BG
Neutron spectraNeutron spectra
Energy spectra at detector front Resolution included spectra
Drescher, Physical Review D77, 056003 (2008)
New modelsNew models(PICCO, (PICCO, EPOS)EPOS)
Neutron Pi0
Proton
LPM effectLPM effect
Transition curve of a 1 TeV photon w/ and w/o LPM to be measured by LHCf
○ w/o LPM■ w/ LPM
Run scheduleRun schedule
LHCf runs will be carried out during the LHCf runs will be carried out during the LHC commissioning with low luminosity LHC commissioning with low luminosity L<10L<103030cmcm-2-2ss-1-1
Data taking at 10TeV collisions in 2008 Data taking at 10TeV collisions in 2008 and 14TeV collisions in 2009and 14TeV collisions in 2009
Dedicated run with beam crossing angle Dedicated run with beam crossing angle in under discussion (pseudo-rapidity in under discussion (pseudo-rapidity limit 8.7 => 8.4)limit 8.7 => 8.4)
Future runs during ion collisions in studyFuture runs during ion collisions in study
SummarySummary Interpretation of CR observation data in Interpretation of CR observation data in
10101515-10-102020eV strongly depends on the eV strongly depends on the interaction model used in the analysis.interaction model used in the analysis.
LHCf will set a crucial calibration point at LHCf will set a crucial calibration point at 10101717eV for the interaction models.eV for the interaction models.
LHCf can measure E, p spectra of LHCf can measure E, p spectra of gamma-rays, πgamma-rays, π00 and neutrons at η>8.7 and neutrons at η>8.7 (8.4).(8.4).
LHCf can clearly discriminate LHCf can clearly discriminate existing/proposed models with a short existing/proposed models with a short operation under very low luminosity operation under very low luminosity condition. condition.
BackupBackup
Knapp, Shower curveKnapp, Shower curve
大気深さ
シャ
ワー
粒子
数
CalorimeterCalorimeter
n, gamma
n, gamma
44 radiation lengths, 1.7 hadron interaction lengths16 sampling scintillators4 position layers (2 for EM, 2 for hadron)
100-7000GeV gamma に対して <5% の分解能
ManipulatorManipulator
DC motor による駆動光学エンコーダ(放射線に弱い ! )による位置測定リニアポテンシオメータ(可変抵抗)値による位置測定