Concept

Tétraquark

Publications associées (320)

Study of the B -> X(3872)K -> D*°-D°K decay at Belle

Recently, many unexpected new particles were discovered with masses around 4 GeV/c2. They are collectively called XYΖ mesons and while some of them have been identified as charmonium states, many others have properties that don't fit into the quark-antiqua ...

EPFL2009

Alignment of the LHCb tracking stations and selection of X(3872) and Z(4430)± in pp collisions at 14 TeV

Louis Nicolas

The LHCb experiment is one of the four large experiments located at the Large Hadron Collider (LHC) at CERN, close to Geneva, Switzerland. The LHCb detector is a single-arm forward spectrometer which is dedicated to precision measurements of CP violation, ...

EPFL2009

First LHC beam induced tracks reconstructed in the LHCb VELO☆

Barinjaka Rakotomiaramanana

The Vertex Locator of the LHCb experiment has been used to fully reconstruct beam induced tracks at the LHC. A beam of protons was collided with a beam absorber during the LHC synchronisation test of the anti-clockwise beam on the weekend 22nd-24th August ...

2009

Measurement of the e+e-→J/ψcc¯ cross section at s≈10.6 GeV

Olivier Schneider, Aurelio Bay, Chao Wang, Tagir Aushev, Vladislav Balagura, Remi Léandre Albert Louvot

We present a new measurement of the e(+)e(-)-> J/psi c(c)over bar cross section where the c(c)over bar pair can fragment either into charmed hadrons or a charmonium state. In the former case the J/psi and a charmed hadron are reconstructed, while the latte ...

2009

Measurement of B(Ds+→μ+νμ)

Olivier Schneider, Aurelio Bay, Mingkui Wang, Chao Wang, Tagir Aushev, Vladislav Balagura, Sun Hee Kim

We present a measurement of the branching fraction B(Ds+→μ+νμ ) using a 548fb-1 data sample collected by the Belle experiment at the KEKB e+e- collider. The Ds momentum is determined by reconstruction of the system recoiling against DKγX in events of the t ...

2008

The analog readout of the LHCb vertex detector and study of the measurement of the Bs oscillation frequency

Jérémie Borel

The LHCb detector is one of the four experimental setups built to detect high-energy proton collisions to be produced by the Large Hadron Collider (LHC). Located at CERN (Geneva, Switzerland), the LHC machine and the LHCb experiment are expected to start i ...

EPFL2008

Probing the photon polarization in $B_s \to \phi \gamma$ at LHCb

Lesya Shchutska

The radiative decay Bs->phi gamma is one of the benchmark channels in the physics programme of the LHCb experiment. It allows us to test the Standard Model through the indirect measurement of the photon polarization in Bs->phi gamma transitions. The estima ...

2007

Measurement of the rare radiative B Meson decays B --> [phi]K[gamma] and B --> [omega]K[gamma] at the Belle experiment and contribution to software development at the LHCb experiment

Christian Jacoby

The Belle experiment is one of the world's two currently running high-energy physics detectors dedicated to study B-mesons produced with an electron-positron collider. It is situated at the Japanese High Energy Research Organization KEK in Tsukuba, near To ...

EPFL2007

Issues in petabyte data indexing, retrieval and analysis

Sébastien Ponce

We propose several methods for speeding up the processing of particle physics data on clusters of PCs. We present a new way of indexing and retrieving data in a high dimensional space by making use of two levels of catalogues enabling an efficient data pre ...

EPFL2006

Contribution to the development of the acquisition electronics for the LHCb experiment

Guido Haefeli

The LHCb experiment is one of the four large particle detectors currently under construction at the LHC accelerator at CERN. It is a forward single-arm spectrometer dedicated to precision measurements of CP violation and rare decays in the b quark sector. ...

EPFL2004

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