40 research outputs found

    Measurement of Upsilon production in collisions at root s=2.76 TeV

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    The production of ő•(1S)\Upsilon(1S), ő•(2S)\Upsilon(2S) and ő•(3S)\Upsilon(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb‚ąí1pb^{-1} collected in proton-proton collisions at a centre-of-mass energy of s=2.76\sqrt{s}=2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the ő•\Upsilon transverse momentum and rapidity, over the ranges $p_{\rm T} Upsilon(1S) X) x B(Upsilon(1S) -> mu+mu-) = 1.111 +/- 0.043 +/- 0.044 nb, sigma(pp -> Upsilon(2S) X) x B(Upsilon(2S) -> mu+mu-) = 0.264 +/- 0.023 +/- 0.011 nb, sigma(pp -> Upsilon(3S) X) x B(Upsilon(3S) -> mu+mu-) = 0.159 +/- 0.020 +/- 0.007 nb, where the first uncertainty is statistical and the second systematic

    Studies of beauty baryon decays to D0ph‚ąí and őõ+ch‚ąí final states

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    A study of CP violation in B-+/- -> DK +/- and B-+/- -> D pi(+/-) decays with D -> (KSK +/-)-K-0 pi(-/+) final states

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    A first study of CP violation in the decay modes B¬Ī‚Üí[KS0K¬ĪŌÄ‚ąď]Dh¬ĪB^\pm\to [K^0_{\rm S} K^\pm \pi^\mp]_D h^\pm and B¬Ī‚Üí[KS0K‚ąďŌĬĪ]Dh¬ĪB^\pm\to [K^0_{\rm S} K^\mp \pi^\pm]_D h^\pm, where hh labels a KK or ŌÄ\pi meson and DD labels a D0D^0 or D‚Äĺ0\overline{D}^0 meson, is performed. The analysis uses the LHCb data set collected in pppp collisions, corresponding to an integrated luminosity of 3 fb‚ąí1^{-1}. The analysis is sensitive to the CP-violating CKM phase ő≥\gamma through seven observables: one charge asymmetry in each of the four modes and three ratios of the charge-integrated yields. The results are consistent with measurements of ő≥\gamma using other decay modes

    Study of forward Z + jet production in pp collisions at ‚ąös=7 TeV

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    A measurement of the Z(‚Üíőľ+őľ‚ąí)Z(\rightarrow\mu^+\mu^-)+jet production cross-section in pppp collisions at a centre-of-mass energy s=7\sqrt{s} = 7 TeV is presented. The analysis is based on an integrated luminosity of 1.0‚ÄČfb‚ąí11.0\,\text{fb}^{-1} recorded by the LHCb experiment. Results are shown with two jet transverse momentum thresholds, 10 and 20 GeV, for both the overall cross-section within the fiducial volume, and for six differential cross-section measurements. The fiducial volume requires that both the jet and the muons from the Z boson decay are produced in the forward direction (2.0<ő∑<4.52.0<\eta<4.5). The results show good agreement with theoretical predictions at the second-order expansion in the coupling of the strong interaction.A measurement of the Z(‚Üíőľ+őľ‚ąí)Z(\rightarrow\mu^+\mu^-)+jet production cross-section in pppp collisions at a centre-of-mass energy s=7\sqrt{s} = 7 TeV is presented. The analysis is based on an integrated luminosity of 1.0‚ÄČfb‚ąí11.0\,\text{fb}^{-1} recorded by the LHCb experiment. Results are shown with two jet transverse momentum thresholds, 10 and 20 GeV, for both the overall cross-section within the fiducial volume, and for six differential cross-section measurements. The fiducial volume requires that both the jet and the muons from the Z boson decay are produced in the forward direction (2.0<ő∑<4.52.0<\eta<4.5). The results show good agreement with theoretical predictions at the second-order expansion in the coupling of the strong interaction

    Etude des sections efficaces et des asymétries di-leptoniques à LEP2. Contraintes sur la physique au-delà du Modèle Standard.

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    I describe in this HDR the scientific works that I have done since my PhD, defended in 1994. The first part of these works was devoted to the development of detectors within the BaBar experiment. The second part, more extensively described here, was the study of the di-leptonic events produced in the ALEPH experiment at LEP2. In the BaBar experiment, I initially contributed to the feasibility study of a Cerenkov counter dedicated to the identification of charged particles. I had then the responsibility of the construction of a wire chamber for the monitoring of the gain, installed in the gas distribution system of the BaBar drift chamber. These activities included design and simulation of instruments as well as analysis of tests data. Then, I participated to the LEP2 data analysis by measuring cross-sections and forward-backward asymmetries of the di-leptonic processes. I made the interpretation of these measurements under various scenarios of new physics beyond the Standard Model, such as four fermions contact interactions, extra-dimensions and production of sneutrinos with R-parity violation. Moreover, I participated to the combination of the di-leptonic results from the four LEP experiments. Those years between construction of detectors and data analysis in the field of electroweak physics make me join today the thematic of neutrinos. The research plan that I present here focuses on this thematic, especially on my future involvement in the Laguna-LBNO project. Finally, I describe also here my various scientific outreach activities, especially toward the scholars, because, in addition to my research and teaching, this is a non-negligible part of my activity in the past decade.Sont d√©crits dans cette HDR, les travaux scientifiques que j'ai r√©alis√©s depuis ma th√®se, soutenue en 1994. La premi√®re partie de ces travaux fut consacr√©e √† la construction et au d√©veloppement de d√©tecteurs au sein de l'exp√©rience BaBar. La seconde partie, plus longuement d√©velopp√©e ici, fut l'√©tude des processus di-leptoniques e+e- ->l+l- au sein de l'exp√©rience ALEPH √† LEP2. Dans l'exp√©rience BaBar, j'ai tout d'abord contribu√© √† l'√©tude de faisabilit√© d'un compteur Cerenkov √† seuil d√©di√© √† l'identification des particules charg√©es. J'ai ensuite eu la responsabilit√© de la construction d'une chambre √† fils de contr√īle du gain install√©e dans le syst√®me de gaz de la chambre √† d√©rive de BaBar. Ces activit√©s incluaient un travail de conception et de simulation de d√©tecteurs ainsi qu'un travail d'analyse de donn√©es de tests. J'ai ensuite particip√© √† l'analyse des donn√©es de LEP2 par la mesure des sections efficaces et des asym√©tries avant-arri√®re des processus di-leptoniques. J'ai effectu√© l'interpr√©tation de ces mesures dans le cadre de diff√©rents sc√©narios de nouvelle physique au-del√† du Mod√®le Standard, tels que les interactions de contact √† quatre fermions, les dimensions suppl√©mentaires ou la production de sneutrinos avec violation de R-parit√©. J'ai de plus particip√© √† la combinaison des r√©sultats di-leptoniques des quatre exp√©riences LEP. Ces ann√©es pass√©es entre construction de d√©tecteurs et analyse de donn√©es dans le domaine de la physique √©lectrofaible m'incitent √† rejoindre aujourd'hui la th√©matique des neutrinos. Le projet de recherche que je pr√©sente est centr√© sur cette th√©matique, notamment sur mon implication future dans le projet Laguna-LBNO. Enfin, je d√©cris aussi dans ce m√©moire mes diff√©rentes activit√©s de diffusion scientifique, notamment aupr√®s du public scolaire, car, en plus de mon travail de recherche et d'enseignement, c'est un aspect important de mon activit√© de ces dix derni√®res ann√©es

    El siglo de Oro en escena

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    Del teatro de S√°nchez de Badajoz (siglo xvi) al de Bances Candamo (finales del xvii), de las m√ļltiples riquezas de la comedia lopesca a las excelencias del teatro calderoniano, de la prosa cervantina a la de un Mateo Alem√°n, del Pinciano al maestro Correas, y ¬ętrecientas cosas m√°s¬Ľ: los art√≠culos reunidos en este libro componen un extenso panorama de los m√°s recientes resultados de la investigaci√≥n internacional sobre toda la literatura espa√Īola del Siglo de Oro, ofrecidos al profesor Marc Vitse por sus m√°s destacados disc√≠pulos, amigos y admiradores.√Ä Marc,Odett

    Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume I Introduction to DUNE

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    International audienceThe preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay‚ÄĒthese mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our universe, its current state, and its eventual fate. The Deep Underground Neutrino Experiment (DUNE) is an international world-class experiment dedicated to addressing these questions as it searches for leptonic charge-parity symmetry violation, stands ready to capture supernova neutrino bursts, and seeks to observe nucleon decay as a signature of a grand unified theory underlying the standard model. The DUNE far detector technical design report (TDR) describes the DUNE physics program and the technical designs of the single- and dual-phase DUNE liquid argon TPC far detector modules. This TDR is intended to justify the technical choices for the far detector that flow down from the high-level physics goals through requirements at all levels of the Project. Volume I contains an executive summary that introduces the DUNE science program, the far detector and the strategy for its modular designs, and the organization and management of the Project. The remainder of Volume I provides more detail on the science program that drives the choice of detector technologies and on the technologies themselves. It also introduces the designs for the DUNE near detector and the DUNE computing model, for which DUNE is planning design reports. Volume II of this TDR describes DUNE's physics program in detail. Volume III describes the technical coordination required for the far detector design, construction, installation, and integration, and its organizational structure. Volume IV describes the single-phase far detector technology. A planned Volume V will describe the dual-phase technology