Progress on Progress on ACORDEACORDE

(ALICE Cosmic ray detector)(ALICE Cosmic ray detector)

Ildefonso León for ACORDE-ALICE group

OutlineOutline

ACORDE Mexican groupACORDE Mexican group

Cosmic ray physics with ALICE Cosmic ray physics with ALICE detectorsdetectors

ACORDE status reportACORDE status report

ACORDE Mexican group

Universidad Nacional Autónoma de MéxicoG. Paic, I. Martínez, E. Cuautle

Centro de Investigación y de Estudios AvanzadosJ.C. Arteaga, A. Cerna, G. Herrera, J. Garcia, R. Pelayo, A.

ZepedaUniversidad Michoacana de San Nicolás de Hidalgo

L. VillaseñorBenemérita Universidad Autónoma de Puebla

I. Bautista, M. Arroyo, A. Fernández, R. Lopez, A. Ortiz, G. Tejeda, S. Roman, A. Vargas, S. Vergara

Universidad Autónoma de SinaloaI. León-Monzón

ACORDE AT CERN ACORDE AT CERN (March 14, 2006)(March 14, 2006)

ALICE- CERNALICE- CERN

ALICE: ALICE: the dedicated HI the dedicated HI experimentexperiment

Solenoid magnet 0.5 T

Central tracking system:• ITS •TPC• TRD• TOF

MUON Spectrometer:• absorbers• tracking stations• trigger chambers• dipole

Specialized detectors:• HMPID• PHOS

Forward detectors:• PMD• FMD, T0, V0, ZDC

Cosmic rays trigger

The DetectorThe Detector

Contribution of ALICE toContribution of ALICE to Cosmic ray physics Cosmic ray physics

Tune and tests of hadronic interaction models Tune and tests of hadronic interaction models (pp, PbPb interactions)(pp, PbPb interactions)

A better comprehension of hadronic interactions A better comprehension of hadronic interactions at very high energy at very high energy Fundamental for the Fundamental for the description of CR description of CR interactions atmosphere. interactions atmosphere.

ACORDE + TPC + TRD + TOF ACORDE + TPC + TRD + TOF Sofisticated tracking system, precise Sofisticated tracking system, precise measurement of particle momentum and measurement of particle momentum and muon energy up to 1-2 TeV (B = 0.5T) muon energy up to 1-2 TeV (B = 0.5T)

Capability to track high density of muons Capability to track high density of muons

Simulation programs to explain the dataSimulation programs to explain the data

CORSIKA code Hadronic interaction models : QGSJET, VENUS, DPMJET, NEXUS, SIBYLL …

The models are tuned using data from accelerators p-p p-pbar A-A collisions. Usually at Tevatron energies ~ 1015 eV or s1/2 = 630 or 900 GeV

LHC energy s1/2 = 14 TeV proton with E = 1017 eV with fixed target Much above the energy of the knee of cosmic rays (E=3 1015 eV)

The most relevant measurements for ALICE are : the pseudo-rapidity distributions of identified hadrons the hadron transverse momentum distributions Considerable interesting should be the study of N-N interactions

Multiplicity distribution of charged particles Multiplicity distribution of charged particles with different hadronic interaction modelswith different hadronic interaction models

Heck, Nucl. Phys B, 2003

Physics topics of interestPhysics topics of interest

Multi-muon eventsMulti-muon events most promising most promising

CosmoAleph measurements CosmoAleph measurements Inclusive muons (single muon)Inclusive muons (single muon)

L3+C measurementsL3+C measurements Cosmic ray point sources, Antiproton Cosmic ray point sources, Antiproton

flux limitflux limit

Large area coincident experimentLarge area coincident experiment

CHALLENGE: CHALLENGE: L3+C measurements L3+C measurements

““Measurement of the shadowing of high energy Measurement of the shadowing of high energy cosmic rays by the Moon: A search for TeV-energy cosmic rays by the Moon: A search for TeV-energy antiprotons”, Astroparticle Phys. 23(2005)p411.antiprotons”, Astroparticle Phys. 23(2005)p411.

““Observation of a Flare Signal from a fixed position Observation of a Flare Signal from a fixed position in the hemisphere through muons with L3+C”, ICRC in the hemisphere through muons with L3+C”, ICRC 2005.2005.

““A search for low velocity exotic particles with the A search for low velocity exotic particles with the L3+C spectrometer”, ICRC 2005.L3+C spectrometer”, ICRC 2005.

““Search for Kolar-like Measurement of the Search for Kolar-like Measurement of the atmospheric muon spectrum from 20 to 3000GeV”, atmospheric muon spectrum from 20 to 3000GeV”, Phys. Lett. B (2004)p15. events from L3+C data”, Phys. Lett. B (2004)p15. events from L3+C data”, ICRC 2005.ICRC 2005.

““The L3+C detector, a unic tool-set to study cosmic The L3+C detector, a unic tool-set to study cosmic rays”, NIMA 488(2002)p209.rays”, NIMA 488(2002)p209.

The trigger conditionsThe trigger conditions

Running during standard Alice data taking imposes stringent conditions for cosmic trigger :• low trigger rate (few Hz)• live time constrictions (statistical problems)

Inclusive muons trigger 450 Hz (too high)We can take only vertical muons 60-70 Hz (high)Statistical problems to measure :• Single muon momentum distribution and charge ratio• Point source in a standard way• Antiproton flux limitMulti-muon events few Hz

Multi-muon eventsMulti-muon eventsCOAMOALEPH : Astroparticle Physics 19 (2003) 513-523

580000 events during 1997-99 runs t = 174 days of data taking t = 20 days effective run time

Multim. events Eth= 70 GeV

Standard LEP trigger : cosmic muons deposit energy in the e.m. and hadronic calorimeter

Selection : events without reconstructed vertex at least one track p>5 GeV/c

Fe 1012<E<1017 eV

p 1012<E<1017 eV

Alice(Torino, Puebla)

Aleph

Muon energy measurementsMuon energy measurementsSome contribution to disentangle among primaries could come from the measurement of the energy of each muon.This is a really new measurement never done in cosmic ray underground apparata

Average energy of muons in the core for different number muons in the core of the shower.

Proton and Fe primaryE = 1015 eV

Physics Performance Report Vol. IIPhysics Performance Report Vol. II

Cosmic ray physicsCosmic ray physics 6.11 6.11

ACORDE ACORDE

recent progress to ALICE collaboration:recent progress to ALICE collaboration:

ALICE Technical Board CERN, Feb., 2006ALICE Technical Board CERN, Feb., 2006 - Electronics, - Electronics, CablingCabling, infrastructure, infrastructure

- Detector control system- Detector control system - Installation in pit started: August 2006- Installation in pit started: August 2006

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First tracks in the TPC, projection viewFirst tracks in the TPC, projection viewisolated track cosmic shower

3D view of shower event: Trigguer from 3D view of shower event: Trigguer from ACORDEACORDE