Y.Itow “Status of LHCf” - HEP

ICRC
ICRC2015,
2015,3030Jul
Jul
Y.Itow “Status of LHCf”
Status of the LHCf experiment
• Physics background
• Experiment and current results
• LHC 13 TeV run and future
STE Lab. / Kobayashi-Maskawa Inst.,
Nagoya University
Yoshitaka Itow
ICRC2015
1
30th Jul 2015
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
1017 eV :Crossroad of accelerators and UHECRs
AUGER
Telescope Array
Air shower experiments
HEAT
TALE
2nd Knee?
Knee
Colliders
0.5 0.9
Cosmic rays 1014
2.76
AUGER, TA
7
Ankle
GZK
13TeV
1017
1020eV
• LHC covers 1014 – 1017 eV cosmic rays
• LHCf measures forward particle spectra relevant t air showers.
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
The LHCf experiment
*,**Y.Itow, *Y.Makino, *K.Masuda, *Y.Matsubara, *E.Matsubayashi,
***H.Menjo, *Y.Muraki, *Y.Okuno, *,**T.Sako, *M.Ueno, *Q.D.Zhou
*Solar-Terrestrial Environment Laboratory, Nagoya University, Japan
**Kobayashi-Maskawa
Institute, Nagoya University, Japan
School of Science, Nagoya University, Japan
Shibaura Institute of Technology, Japan
***Graduate
K.Yoshida
T.Iwata, K.Kasahara, T.Suzuki, S.Torii
Waseda University, Japan
Y.Shimizu, T.Tamura Kanagawa University, Japan
N.Sakurai
Tokushima University, Japan
M.Haguenauer
Ecole Polytechnique, France
W.C.Turner
LBNL, Berkeley, USA
O.Adriani, E.Berti, L.Bonechi, M.Bongi, G.Castellini, R.D’Alessandro,
M.Delprete, M.Grandi, G.Mitsuka, P.Papini, S.Ricciarini, A.Tiberio
INFN, Univ. di Firenze, Italy
A.Tricomi
J.Velasco, A.Faus
A-L.Perrot
INFN, Univ. di Catania, Italy
IFIC, Centro Mixto CSIC-UVEG, Spain
CERN, Switzerland
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
The LHCf experimental setup
140m
calorimeter
Arm2
IP1
n
Front Counter
g
p0
D1
D1
calorimeter
Arm1
Front Counter
Arm1
Arm2
44X0,
1.6 lint
16 tungsten + pl.scinti. layers
25mmx25mm+32mmx32mm
4 Silicon strip tracking layers
16 tungsten + pl.scinti. layers
20mmx20mm+40mmx40mm
4 SciFi tracking layers
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Calorimeter performance





Gamma-rays (E>100GeV, dE/E<5%)
Neutral Hadrons (E>a few 100 GeV, dE/E~40%)
Neutral Pions (E>700GeV, dE/E<3%)
Shower incident position (170mm / 40mm for g, Arm1/Arm2)
( 1mm for hadron showers)
p0
g-like
Had-like
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Brief history of LHCf
• May 2004 LOI
Jul 2006
construction
Jan 2008
Installation
Sep
1st LHC beam
• Feb 2006 TDR
• June 2006 LHCC
approved
Aug 2007
SPS beam test
Dec- Jul 2010
0.9TeV& 7TeV pp
Detector removal
Dec2012- Feb 2013
5TeV/n pPb, 2.76TeVpp
(Arm2 only)
Detector removal
May-June 2015
13 TeVpp
Detector removal
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Y.Itow “Status of LHCf”
h>10.94
ICRC 2015, 30Jul
7 & 0.9 TeV pp
photon
h> 10.76
PLB 703 (2011) 128-134
PLB 715 (2012) 298-303
7TeV pp
neutron
Submitted PLB
LHCf published
results
7TeV pp
p0
PRD 86 (2012) 092001
5TeVn pPb
p0
PRC 89 (2014) 065209
Y.Itow “Status of LHCf”
Very forward neutron at 7TeV p-p
• h>10.76 : QGSJET03 good, 8.99>h>9.22 DPMJET3 good
• Larger neutron / gamma ratio than expected
Submitted to PLB
40% E res. unfolded
8.99<h<9.22
Data
3.05±0.19
DPMJET3.04
EPOS 1.99
PYTHIA 8.145
QGSJET II-03
SYBILL 2.1
1.05
1.80
1.27
2.34
0.88
n / g ratio
n / g ratio
h> 10.76
ICRC 2015, 30Jul
Data
1.26±0.08
DPMJET3.04
EPOS 1.99
PYTHIA 8.145
QGSJET II-03
SYBILL 2.1
0.76
0.69
0.82
0.65
0.57
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LHCf Type-I and Type-II p0 analysis
Type-I
Type-II
ICRC 2015, 30Jul
Type-II
Type-I
PTp0(GeV/c)
Y.Itow “Status of LHCf”
1
0
0
Ep0(TeV)
4 0
Ep0(TeV)
4
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Y.Itow “Status of LHCf”
Pz spectra Type-I + Type-II
0
p
ICRC 2015, 30Jul
To be submitted PRD
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
LHCf p0 yields vs collision energies
To be submitted PRD
RHICf 510GeVpp planed
Y.Itow “Status of LHCf”
•
•
•
•
•
LHC 13TeV LHCf run 2015
ICRC 2015, 30Jul
Week24, Jun 9~13, LHCf dedicated low-lumi run
Total 26.6 hrs w/ L=0.5~1.6e29 cm2s-1
~39 M showers, 0.5 M p0 obtained
Trigger exchange with ATLAS
Detector removal on Jun 15th during TS1
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
First look from 13 TeV data
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Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
ATLAS-LHCf trigger exchange
• Non-diffraction tagging by
Ntrk>=2 in ALTAS |η|<2
(PT>100 MeV/c)
• Diffraction : 10 % of LHCf data
Prescaled
Hadron(neutron)
MC by PYHITA
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Future prospects
• RHICf ( LHCf detector at RHIC zero degree)
– Participate Run-17 510 GeV pp at the STAR site
– Comparison to 7&13TeV data with same pT coverage
RHICf Ep0 expected
510 GeV pp
6.36<y<6.70
h>5.8
p
RHICf
18m
–
• And also LHC p-Pb run, and future LHC p-Oxygen …
Y.Itow “Status of LHCf”
Summary
ICRC 2015, 30Jul
• The LHCf : particles spectra at very forward of LHC
• h > 8.4, with nice performance for PID, EM energy and PT
• So far g, p0 ,n from 0.9, 2.76 and 7 TeV p-p, and p0 5TeV p-Pb
• Energy spectra for very forward neutron
• Bump at large XF, data shows more neutron yield than models
• New p0 analysis
• Add Type-II p0, complete acceptance coverage
• Comparison of 7 TeV and 2.76 TeV p-p
• LHC 13 TeV pp and Future
• 13 TeV run successfully done in Jun 2015, analysis on-going
• RHICf 510 GeV pp in 2017, LHC p-Pb, and more
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Backup
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
LHCf average PT of Type-I + Type-II p0
400
350
250
200
T
<p > [MeV]
300
To be submitted PRD
LHCf ( s=7TeV)
LHCf ( s=2.76TeV)
LHCf ( sNN=5.02TeV)
UA7 ( s=630GeV)
150
DPMJET 3.0.6 (p+p)
100
50
0
DPMJET 3.0.6 (p+Pb)
QGSJET II-04 (p+p)
RHICf planed
QGSJET II-04 (p+Pb)
-2 -1.5 -1 -0.5 0
y
-y
beam
0.5
1
1.5
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Rapidity vs Forward energy spectra
Gamma-rays @ √s=14TeV
450mrad
310 mrad
θ
[μrad]
h= 8.7
h= ∞
η
310
8.7
0
∞
Viewed from IP1
(red:Arm1, blue:Arm2)
Projected edge
of beam pipe
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Rapidity vs Forward energy spectra
θ
[μrad]
h= 8.7
h= ∞
η
8.7
Viewed from IP1
(red:Arm1, blue:Arm2)
∞
Projected edge of
beam pipe
310
0
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Y.Itow “Status of LHCf”
LHCf single g spectra at 7TeV
 None of the models agree with data
 Data within the range of the model spread
h>10.94
8.81<h<8.99
ICRC 2015, 30Jul
PLB 703 (2011) 128-134
0.68 (0.53)nb-1 on
15May2010
DPMJET 3.04
QGSJETII-03
SIBYLL 2.1
EPOS 1.99
PYTHIA 8.145
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
LHCf single g spectra at 900 GeV
PLB 715 (2012) 298-303
DPMJET 3.04
8.77 <h<9.46 QGSJETII-03
SIBYLL 2.1
EPOS 1.99
PYTHIA 8.145
h>10.15
May2010, 0.3nb-1
(21% normalization
uncertainty )
MC/Data
MC/Data
6
5
4
6
5
4
3
2
1
3
2
1
50
E(GeV)
450
50
E(GeV)
450
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
LHCf
p0
PT spectra at 7TeV
PRD 86 (2012) 092001
Type-I
Type-II
1
ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
LHCf nuclear modification factor (-11.0>h > -8.9)
Very large suppression (~ 0.1) at PT ~ 100MeV region
Models also show similar large suppression, but PT dependence ?
<Ncoll>=6.9± 0.7
Ratio to pp
•
•
3
2
1
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Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
LHCf EM(p0) energy flow vs rapidity (7TeV)
Plot by N.Sakurai
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Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
LHCf neutron energy flow vs rapidity
Plot by N.Sakurai
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
ATLAS ND Tagged LHCf g and neutrons
13 TeV pp MC (PYTHIA)
g
Hadron(neutron)
Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
XF scaling of very forward neutron
A. Adare, et al., Phys. Rev. D, 88, 032006 (2013)
RHIC PHENIX (200GeV),
ISR (30.6-62.7 GeV)
K.Kawade PhD thesis (2014)
LHCf 7TeV neutron (Arm1 only)
0<PT<0.11xF GeV/c
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Y.Itow “Status of LHCf”
PTp0 spectra Type-I + Type-II
p0
ICRC 2015, 30Jul
To be submitted PRD
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Feynman scaling in p0 production
To be submitted PRD
preliminary
preliminary
• LHCf π0 spectra at √s= 2.76 and 7 TeV (preliminary)
• Soon compared w/ LHC 13 TeV, and future RHICf (510GeV)
Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
Detector performance
Ehad resolution
Eg resolution
4%
Number of event
100
200 GeV electrons
200 E(GeV)
350GeV protons
sx=172 mm
Position resolution
For hadron, Dx~2.5 mm
x-pos[mm]
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Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
PID (SPS energy)
EM shower (SPS)
Hadronic shower (LHC MC)
JINST, 9, P03016 (2014)
energy resolution (%)
position resolution (mm)
position resolution (μm)
energy resolution (%)
NIM, A671 (2012) 129-136
JINST, 5, P01012, 2010
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Y.Itow “Status of LHCf”
ICRC 2015, 30Jul
Hadron shower reconstruction
Check by SPS 350GeV p beam
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Expected Results (single photons)
6.26<η<6.49
7.40<η<7.83
6.87<η<7.40
8.27<η
• Photon spectra at 4 rapidity samples
• 12 hours statistics (12 nb-1 effective luminosity; 360nb-1 delivered)
• Statistical error is almost negligible except at the highest energy bins
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ICRC 2015, 30Jul
Y.Itow “Status of LHCf”
Expected Results (single neutrons)
6.26<η<6.49
6.87<η<7.40
7.40<η<7.83
•
8.27<η
• Neutron spectra at 4 rapidity samples
12 hours statistics (12 nb-1 effective luminosity; 360nb-1 delivered)
• RHICf resolution not considered; true spectra
• Statistical error is almost negligible
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Y.Itow “Status of LHCf”
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•
•
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ICRC 2015, 30Jul
Possible future p-Oxygen run
Important missing information ; nuclear shadowing
Large suppression 0.1 for p-Pb for very forward p0 at low PT
Less expected for p-Light Ion, but model dependent (~25%)
Oxygen beam is technically feasible in LHC
p-p
p-N
QGSJET II-04
All hs
p-Pb
Energy8.81<h<8.99
flow
h>10.94
By T.Pierog
By S. Ostapchenko
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