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Nuclear and high-energy physics laboratory - UMR 7585

The LPNHE is a joint research unit (UMR 7585) of the National Institute of Nuclear Physics and Particle Physics (IN2P3), Institute of the CNRS, Sorbonne Université and Paris Diderot Paris 7. It hosts 15 research teams, three technical services (computers, electronics, mechanical), and two support services (administration, logistics). The laboratory is engaged in several major experimental programs pursued in the framework of international collaborations with very large research facilities around the world, centers of particle accelerators and observatories.

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The research programs cover current issues in particle physics, astroparticle and cosmology:

Origin of mass and particle families, search for the Higgs boson, the unification of fundamental interactions, search for supersymmetry, extra dimensions of space-time issues addressed by the experiments CDF and D0 at the Tevatron at Fermilab, and ATLAS experiment at the Large Hadron Collider at CERN, and issues of a future e+e- collider, which is engaged in the LPNHE development of silicon detectors.

Matter-antimatter asymmetry in the universe: the main subject of the BaBaR experiment at Stanford Linear Accelerator Center (SLAC), CERN LHCb and SuperB project preparation in Italy.

Properties of neutrinos: participation in the Tokai To Kamiokande (T2K) experiment in Japan.

Energy content of the universe, dark matter and dark energy: Cosmology LPNHE group plays a role in Supernovae Legacy Survey (SNLS) with the Canadian French Hawaii Telescope and the program Supernovae Factory (SNF) at the UH 2.2m telescope , and is engaged in the preparation of future projects "Supernova Acceleration Probe (SNAP / JDEM), EUCLID and Large Synoptic Survey Telescope (LSST).

Origin of cosmic rays of high energy gamma rays at TeV for the HESS observatory in Namibia, and cosmic rays of ultra high energy (10 ** 18 eV) Auger Observatory in Argentina.

From the design of experiments, through the design and construction of detection instruments, the development of detection systems, acquisition and data reduction, calibration and monitoring of sensors for long periods data collection, analysis and interpretation of physical measures, to finally lead to publications, takes several years, sometimes more than ten years, which spreads the work of teams together and develop skills in extremely diverse physics, electronics, computer or mechanical. LPNHE theorists are a small component that enriches the life science laboratory. The laboratory is a member of the Federation for Research on Fundamental Interactions.


astroparticle cosmology, particle physics, theoretical physics, instrumentation, electronic, mechanical, computer, computing grid.

Teams and research themes

PARTICLE PHYSICS Frontier Energy * ATLAS experiments at the LHC (CERN) and experiments CDF and D0 (Fermilab), R & D for the Super LHC * R & D for Future Linear Collider

PHYSICS OF FLAVORS * CP Violation: BaBar (SLAC) and LHCb in the LHC (CERN), Italy * Project SuperB Study of neutrinos: T2K Japan

ASTROPARTICULES high-energy cosmic ray * high-energy photons in the Universe: HESS 1 and 2, CTA * Study of cosmic rays at extreme energies: Auger Observatory

* Supernova cosmology program: SNF, SNLS and projects SNAP / JDEM, EUCLID and OHSA

* QCD theory, approaches phénomemologiques, evolution of large structures in the universe

Current Projects

In the coming years, particle physics, the search for Higgs boson at the Tevatron (D0), will continue intensively and will remain a priority discipline. With the LHC, the area has picked up with the great diversity of research that can be pursued. Correspondingly we must ensure the nominal operation of the grid Ile de France, which will remain open to other disciplines. The results to be obtained at the LHC will be crucial to decide the major future directions. We can anticipate that it will be important to increase the performances of the machine (brightness) - Project SLHC-detectors and adapt accordingly. The LPNHE should participate in the upgrade of the ATLAS Inner Detector. Meanwhile, R & D for a detector with a very high energy e+e-collider will continue. The study of B meson decays in the BabaR experiment is nearing its end and the LHCb experiment is now over. The T2K experiment in Japan has seen its first neutrinos and will take data for several years.
In astroparticle physics, the fifth large observatory telescope Central Hess will soon be put into operation and allow the study of Gamma Rays on a wider energy range and with greater sensitivity. The LPNHE involved in the study of a large global project on networking of dozens of telescopes on Cherenkov radiation (Project CTA Cherenkov Telescope Array, included in the Roadmap of ESFRI), a project motivated by success already achieved in Phase 1 HESS showing the range of scientific perspectives of such a network for continuing and expanding research in high energy gamma-ray astronomy. The search for sources of cosmic rays of ultrahigh energies with the Auger Observatory continues, as well as a refined measure of the spectrum and study of the composition of cosmic rays.
In cosmology, the SNF and SNLS projects produce significant results and the accuracy in measuring cosmological parameters should be significantly improved thanks to the analysis of SNF. The LPNHE commitment to this effort to a project of observational cosmology Ground (Large Synoptic Survey Telescope) with a wider field of investigation (gravitational distortions, large-scale distribution of galaxies ...) and continued scientific studies in order to achieve a space experiment (SNAP / JDEM the United States and Europe EUCLID).

Scientific advances, significant results

Particle Physics
The precise measurements of top quark properties (mass, production in high energy p-p collisions, decays), of the vector W boson mass and the direct search for the Higgs boson have provided strong constraints on theoretical models, and particularly on the mass and production cross section of Higgs boson. These studies are continuing with the D0 and CDF detectors.
The study of B mesons has grown thanks to the excellent performance of the accelerators at SLAC and Fermilab. After the establishment of violation of CP symmetry (matter-antimatter) with B mesons, the search for unexpected effects in the Standard Model has continued with the study of rare decays of B, measuring the oscillation frequency of Bs, and the exploration of matter-antimatter asymmetry in the charmless decays of Bd mesons. The quark mixing matrix is now very strongly overstress, which provides limitations to the possible extensions of the Standard Model. The vast amount of data has also allowed the discovery of new resonances which are interpreted.
The start of data taking of the ATLAS experiment marks a transition in the life of the group that starts today in the analysis of LHC data.


The HESS observatory in Namibia takes data with its four large telescopes since 2004. The sources of gamma rays that have already been detected multiplied by a factor of more than three the number of sources of high energy gamma rays (TeV), which had been previously identified. With the accumulation of a large statistics and high resolution cameras, the high-energy gamma astronomy is entering a new era. Some highlights include: strong evidence of the mechanism of acceleration of cosmic rays by the supernova explosion, obtaining a lower limit on the background of infrared emission from distant blazars study, detection of the first periodic source TeV, observation of the morphology of many astrophysical objects ... In parallel, since 2003, studies for the camera fifth very large telescope (Hess Phase 2) have been committed. The construction of the camera is now almost complete. The LPNHE was supervisor of the electronics of this camera.
The deployment of the Pierre Auger Observatory is now virtually complete. The observatory is the leading place to try to elucidate the origin of cosmic rays of ultra-high energy (beyond 1018 eV). The accumulated data have provided a major result on the cosmic ray spectrum: this spectrum reproduces the GZK cutoff (Greisen predicted in 1966, Zatsepin and Kusmin) to 1020 eV, a horizon fundamental data seemed to go beyond previous experience. A strong correlation between the directions of cosmic rays of ultra high energy and the positions of active galactic nuclei has been observed. Significant limitations were placed on the composition of cosmic rays into photons and neutrinos dramatically reducing the exotic production of models. 


The laboratory is guiding the international program of observation of supernovae for cosmology. The main scientific objective of forcing the cosmological parameters, more precisely to obtain precise information on the nature of dark energy. The observations made with the CFHT with the camera Megacam (Supernovae Legacy Survey) already provide a meaningful measure of the equation of state of dark energy. The concordance model of cosmology with 70% of dark energy, 27% of dark matter and 3% of baryonic matter can accommodate the diverse results of observations: cosmic microwave background radiation fluctuations, distribution of galaxies to large scale and Hubble diagram (luminosity distance versus redshift) type Ia supernovae which the laboratory has greatly contributed. The use of integral field spectrograph (SNIFS) on a telescope in Hawaii ends and allowed a systematic study of the properties of nearby supernova (Supernovae Factory program) to reinforce their role as standard candle.

Graduate Schools

ED 517 - Particles, Nuclei and the Cosmos
ED 389 - Physics of solid particle
ED 107 - Physics of the Paris Region
ED 127 - Astronomy and Astrophysics in Ile de France

Scientific partnerships

All research activities of the LPNHE are carried out within the framework of scientific partnerships. The laboratory's tutelage the CNRS National Institute of Particle Physics and Nuclear Physics (IN2P3). It is involved in several major experimental programs performed in international collaborations with very large research facilities around the world, centers of particle accelerators and observatories.
Locally, the LPNHE is a member of the Federation of Research Fundamental Interactions.


GIS Physique des 2 Infinis (P2I)


The LPNHE is involved in several European and international programs:
EUDET, AUGER ACCESS, HELEN, European Laboratories Associates (ELGA), International Laboratory Associates (FCPPL, FJPPL, FKPPL, ILPPC), ...

Industrial partnerships

The Laboratory contributes to the GIS (Scientific Interest Group) "Sources and accelerators" between the CNRS and Thales Electron Devices, which purpose is to create strong links between a manufacturer and French sources and body cavities research that uses them. Another GIS has been concluded with Photonis (HESS). Finally, an agreement signed by the IN2P3 with HPK (Hamamatsu Photonics) for the LPNHE concerns R & D in microelectronics for the reader of silicon detectors.

Main equipment

Major projects in which the LPNHE is involved are made by several laboratories that distribute responsibility according to their capabilities and skills. Technical services therefore play an important role in the visibility and production of the laboratory. The acquisition of advanced equipment is a necessity to meet the specifications of increasingly demanding scientific projects. The main technical achievements were for projects ATLAS (electronic control), HESS Phase 2 (camera and acquisition), SNF (mechanical, software instrument reading), SNAP (R & D reading CCD detectors and infrared), AUGER (system Central acquisition), LLRF (low level electronic control of accelerating cavities), OHSA (mechanical, eléctronque reading CCD). Note also the R & D mechanics and electronics for the development of silicon detectors to track the prospects of a future linear collider, and the development of a system of photometric calibration for future large telescope projects for cosmology. Besides electronics laboratories and clean rooms, the main elements are:

- Electronics: a machine tipped for testing electronic circuits and a logic analyzer generator,

- Mechanical Sciences: a digital lathe system for positioning and sizing of precision, a coordinate measuring machine, a digital central processing

- Computer: The laboratory houses a node of the grid Ile-de-France.

Main guardianship

Sorbonne Université

Other guardianship

CNRS, Université Paris 7

Contact Informations
Contact Informations
PAIN Reynald
01 44 27 48 36
Physical address
Tour 12-22 1er étage - Campus Jussieu
4 place Jussieu 75252 Paris cedex 05

Laboratory's mail
Mailing address

Communications Contact
COSSIN Isabelle
01 44 27 68 95
Administrative Contact
01 44 27 63 17

Faculty Members :

Researchers :

Helper :

Postdocs :

PhD :

Surface :
4400 m2


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