The LHCf Collaboration

ITALYITALYFirenze University and INFN:Firenze University and INFN: O.Adriani, L.Bonechi, M.Bongi, O.Adriani, L.Bonechi, M.Bongi, G.Castellini, R.D’Alessandro, G.Castellini, R.D’Alessandro, P.Papini, S. Ricciarini, A. VicianiP.Papini, S. Ricciarini, A. VicianiCatania University and INFN:Catania University and INFN: A.TricomiA.Tricomi

JAPAN:JAPAN:STE Laboratory of Nagoya University:STE Laboratory of Nagoya University:K.Fukui, Y.Itow, T.Mase, K.Masuda, K.Fukui, Y.Itow, T.Mase, K.Masuda, Y.Matsubara,H.Matsumoto,H.Menjo,Y.Matsubara,H.Matsumoto,H.Menjo,T.Sako, K.Taki, H.WatanabeT.Sako, K.Taki, H.WatanabeKonan Univ. Kobe:Konan Univ. Kobe: Y.Muraki Y.MurakiRISE Waseda Univ. Tokyo:RISE Waseda Univ. Tokyo: K.Kasahara, K.Kasahara, M.Mizuishi,M.Mizuishi, Y.Shimizu, S.ToriiY.Shimizu, S.ToriiShibaura Univ. Saitama:Shibaura Univ. Saitama: K.Yoshida K.YoshidaKanagawa Univ. Yokohama: Kanagawa Univ. Yokohama: T.TamuraT.Tamura

SPAINSPAINIFIC Valencia:IFIC Valencia: A.Fauss, J.VelascoA.Fauss, J.Velasco

FRANCEFRANCEEcole Politechnique Paris:Ecole Politechnique Paris:M. HaguenauerM. Haguenauer

USAUSALBNL Berkeley:LBNL Berkeley:W. TurnerW. Turner

CERNCERND.Macina, A.L. PerrotD.Macina, A.L. Perrot

ATLASATLASINTERACTION POINTINTERACTION POINT

(IP1)(IP1)

Beam lineBeam line

Detector IIDetector IITungstenTungstenScintillatorScintillator

Silicon Silicon -strips-strips

Detector IDetector ITungstenTungstenScintillatorScintillator

Scintillating fibersScintillating fibers

140 m140 m 140 m140 m

LHCf experimental method is based on 2independent detectors installed on both sides of IP1

LHCf experiment Study of 0 and n production cross sections as functions

of pT in the very forward region of LHC.

Simulation of an atmospheric shower initiated by a 1019 eV proton

0

n

Calibration at high energy (LHC: 1017eV in the LAB frame) of Montecarlo codes used for the reconstruction of atmospheric showers produced by very high energy primary cosmic rays

The LHCf The LHCf detectorsdetectors

scintillating fibers

tungsten layers

scintillators

-strip silicon layers

scintillators

tungsten layers

ARM #ARM #11

ARM #2ARM #2

~30cm

~30cm

4040 mm2

2020 mm2

3232 mm2

2525 mm2

~9cm

~9cm

Arm #1E/E<3%@200GeV<200 m spatial resolution

m/m = 5%

Excellent tool to calibrate the energy measurement!

Expected resultsExpected results0 mass resolution

0 energy spectrum

Model dependence ofneutron energy distribution

Arm #2E/E<3%@200GeV<100 m spatial resolution

Spatial resolution for Arm#2

Electrons200GeV=52m