Y.Itow, The first results from the LHCf experiment HESI10@ 12 AUG 2010 The First Results from the LHCf experiment Yoshitaka Itow Solar-Terrestrial Environment Laboratory Nagoya University for the LHCf collaboration HESI 2010 Aug 10-13, 2010, YITP
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 The seven LHC experiments IP5 :CMS TOTEM Dedicated to 0-deg. Verify cosmic ray interaction models IP1 : ATLAS, LHCf IP8: LHCb, IP2: ALICE MoEDAL
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 The LHCf Collaboration K.Fukatsu, Y.Itow, K.Kawade, T.Mase, K.Masuda, Y.Matsubara, G.Mitsuka, K.Noda, T.Sako, K.Suzuki, K.Taki Solar-Terrestrial Environment Laboratory, Nagoya University, Japan K.Yoshida Shibaura Institute of Technology, Japan K.Kasahara, M.Nakai, Y.Shimizu, T.Suzuki, S.Torii Waseda University, Japan T.Tamura Kanagawa University, Japan Y.Muraki Konan University, Japan Y.Shimizu ICRR, University of Tokyo,Japan M.Haguenauer Ecole Polytechnique, France W.C.Turner LBNL, Berkeley, USA O.Adriani, L.Bonechi, M.Bongi, R.D’Alessandro, M.Grandi, H.Menjo, P.Papini, S.Ricciarini, G.Castellini INFN, Univ. di Firenze, Italy A.Tricomi INFN, Univ. di Catania, Italy J.Velasco, A.Faus IFIC, Centro Mixto CSIC-UVEG, Spain D.Macina, A-L.Perrot CERN, Switzerland
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 LHCf experimental site IP1 Compact calorimeter 95mm 140m ATLAS 96mm 140m LHCf 140m TAN absorber
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 LHCf: location and detector layout Detector II Detector II Detector I Detector I INTERACTION POINT INTERACTION POINT Tungsten Tungsten Tungsten Tungsten Scintillator Scintillator Scintillator Scintillator IP1 (ATLAS) IP1 (ATLAS) µ strips Silicon µ strips Scintillating fibers fibers Silicon Scintillating 140 m 140 m 140 m 140 m 140 m 140 m 140 m 140 m Beam line Beam line 44X 0 , 1.6 λ int Arm#1 Detector Arm#2 Detector 20mmx20mm+40mmx40mm 25mmx25mm+32mmx32mm 4 SciFi tracking layers 4 Silicon strip tracking layers
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 LHCf calorimeters 2 9 0 m m Arm#1 Detector m Arm#2 Detector m 0 9
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Detector vertical position and acceptance � Remotely changed by a manipulator( w/ accuracy 50 µ m) Garage position when beam tune To prevent unnecessary dose (10 -3 of data taking mode) Data taking mode 3 different position G To cover P T gap Neutral flux center Distance from neutral center Beam pipe aperture All γ from IP N L L N Viewed from Interaction Point
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Very forward EM measurement at LHC Multiplicity Energy Flux All particles neutral 8.4 < η < ∞ Most of the energy flows into very forward
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Typical detector performance � Gamma-rays (E>100GeV,dE/E<5%) � Neutral Hadrons (E>a few 100 GeV, dE/E~30%) � Neutral Pions (E>700GeV, dE/E<3%)
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Motivation
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Verify hadron interaction models used in air shower simulations at 0-degree in LHC Uncertainty in � QGSJET Ⅰ、 Ⅱ air-shower observables � DPMJET E-scale � SIBYLL Composition � EPOS ……..
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Energy spectrum of UHE cosmic rays LHC 14TeV ANKLE GZK KNEE ν e GZK cut off ＋ μ π γ γ ＋ p p ＋ E = 1 0 0 e V 2 n E 0 . 8 x 1 0 0 e V 2 ~
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Air shower observation Model uncertainty in hadron interactions at UHE Air Florescence telescope (FD) EM component (most of energy) Scintillation lights Shower directions Shower max altitude � Robust against interaction model. Floresense � Detector systematics detectors Surface Detectors (SD) Number of particles Arrival timing Muon or EM component ( at given altitude) � interaction model dependence.
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Airs shower experiments for UHECRs 100km 2 AGASA (SD) HiRes (FD) Thick water Cherenkov ( µ sensitive ) Thin plastic scinti (EM sensitive) 760km 2 3000km 2 TA (SD+FD) AUGER (SD+FD)
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 UHECR GZK Problem ~ recent situation ~ AUGER E spectrum TA Xmax p or Fe ? 10 20 eV 10 18 eV HiRes Xmax p AUGER Xmax p Fe Fe 10 18 eV 10 20 eV
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 ① Inelastic cross section If large σ rapid development If small σ ③ 2ndary interactions deep penetrating ② Forward energy spectrum (or Inelasticity k ) If large k rapid development If small k deep penetrating Need both ① and ② LHC ｆ is dedicated to ② ① will be give by Roman Pod at LHC
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Impact of shower development uncertainty on E-scale/composition � Surface detector would get uncertainty of E-scale Composition error E-scale error (AGASA claims 20%) #of particles � Florescence should be OK ( a few %) for E-scale But FD �� SD problem � Composition uncertainty AUGER alt. AUGER ICRC09 Atm. depth J.Knapp Astropart. Phys.19 (2003) 77
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Forward E spectra by LHCf @ 14TeV (MC for ~0.1nb -1 ) Neutrons (true energy) single γ π 0 Neutrons (w/ 30% resolution)
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Results from the 1 st physics runs
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 2009-2010 run summary � 900 GeV run (no crossing angle) � 06 Dec. –15 Dec. 2009 (27.7 hrs, 500K collisions) � 2.8K / 3.7K single showers at Arm1 / Arm2 � 02 May – 27 May in 2010 (15hrs, 5.5M collisions) � 44K / 63K single showers at Arm1 / Arm2 � 7 TeV run (0 µ rad and 100 µ rad crossing angle) � 30 Mar. – 19 July in 2010 (~150hrs, ) � 172M / 161M single showers at Arm1 / Arm2 � 345K / 676 K π 0 s at Arm1 / Arm2 � Detectors removal was done at 20 Jul.
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Particle ID A transition curve for Gamma-ray A transition curve for Hadron Thick for E.M. interaction (44X 0 ) Thin for hadronic interaction(1.7 λ ) L90% @ 40mm cal. of Arm1 Definition of L90% Preliminary MC (QGSJET2) Data Gamma-ray like Hadron like • ~ 90% efficiency with ~10% contamination
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 900GeV spectra Eff. uncorrected, stat.error only Normalized by total # of events. Arm1 Arm1 Hadron like Hadron like Gamma- Gamma -ray like ray like Preliminary Preliminary Arm2 Arm2 Hadron like Gamma- -ray like ray like Hadron like Gamma
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 7TeV spectra Arm1 Arm1 Gamma- -ray like ray like Hadron like Gamma Hadron like preliminary preliminary Arm2 Arm2 Gamma- -ray like ray like Gamma Hadron like Hadron like preliminary preliminary Only 2% of data shown. Now study is under going.
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 7TeV data: Typical π 0 event
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 7TeV results : π 0 reconstruction σ =6.3MeV (4.7%) LHCf Preliminary LHCf Preliminary σ =3.1MeV (2.3%) Arm2 Arm2 7TeV 7TeV
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 7TeV results: Reconstruction of η π 0 Candidate η Candidate Preliminary
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Next step � Revisit LHC when next energy upgrade (i.e. @14 TeV in 2013) � Detector will be upgraded with rad-hard GCO scintillator � Light ion collision to understand nuclear effects � So far only heavy ions (Pb-Pb) collisions are forseen ( in late 2010) at LHC, in which LHCf will not perticipate. � Feasible study under going to cope with high multiplicity at 0 degree. 0.5 particle/cm^2 3.5TeV/n N- N collisions Mulitiplicity in 0-1cm cone at 140m DPMJET3 QGSJET2
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Summary � LHCf : Dedicated measurements of neutral particles at 0 deg at LHC energy for the verification of cosmic rays interaction models at 10 17 eV. � Phase-I run completed. Analysis on-going. � 900 GeV run : ~ 100K showers in both arms � 7 TeV runs : ~300M showers, ~1M π 0 in both arms � Revisit LHC for next energy upgrade at ~2013 with a rad-hard detector. � Possible future Light Ion runs? R&D in progress. UHECR data may hint ultra high energy interactions at beyond-LHC energy. To approach, LHCf will give firm base of understanding at 10 17 eV.
Y.Itow, The first results from the the LHCf experiment HESI10@ 12 Aug 2010 Backup
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