SuperB: A High-Luminosity Heavy Flavour Factory. Conceptual Design Report.

479 páginas.-- INFN/AE - 07/2, SLAC-R-856, LAL 07-15.-- et al.Work supported in part by US department of Energy contract DE-AC02-7 6SF00515. SuperB project.Peer reviewe

Measurement of the 136Xe two-neutrino double- β -decay half-life via direct background subtraction in NEXT

NEXT Collaboration: et al.We report a measurement of the half-life of the 136Xe two-neutrino double-β decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with 136Xe-enriched and 136Xe-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of 2.34+0.80−0.46(stat)+0.30−0.17(sys)×1021yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double-β-decay searches.The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under Grant No.951281-BOLD; the European Union’s Framework Programme for Research and Innovation Horizon 2020 (2014–2020) under Grant No. 957202-HIDDEN; the MCIN/AEI/10.13039/501100011033 of Spain and ERDF “Away of making Europe” under Grant No.RTI2018-095979, the Severo Ochoa Program Grant No.CEX2018-000867-S, and the María de Maeztu Program Grant No.MDM-2016-0692; the Generalitat Valenciana of Spain under Grants No. PROMETEO/2021/087 and No. CIDEGENT/2019/049; the Portuguese FCT under Project No. UID/FIS/04559/2020 to fund the activities of LIB Phys-UC; the Pazy Foundation (Israel) under Grants No.877040 and No.877041; the U.S. Department of Energy under Contracts No.DE-AC02-06CH11357(Argonne National Laboratory),No. DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), No. DE-FG02-13ER42020 (TexasA&M),No.DE-SC0019054 (Texas Arlington), and No.DE-SC0019223 (Arlington,TX); the U.S. National Science Foundation under Grant No. CHE2004111;and the Robert A. Welch Foundation under Grant No.Y-203120200401. D.G.D. acknowledges support from the Ramón y Cajal program (Spain) under Contract No. RYC-2015-18820.Peer reviewe

The dynamics of ions on phased radio-frequency carpets in high pressure gases and application for barium tagging in xenon gas time projection chambers

NEXT Collaboration: et al.Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at atmospheric pressures and above. We develop new analytic and computational methods for modeling RF ion transport at densities where dynamics are strongly influenced by buffer gas collisions. An analytic description of levitating and sweeping forces from phased arrays is obtained, then thermodynamic and kinetic principles are used to calculate ion loss rates in the presence of collisions. This methodology is validated against detailed microscopic SIMION simulations. We then explore a parameter space of special interest for neutrinoless double beta decay experiments: transport of barium ions in xenon at pressures from 1 to 10 bar. Our computations account for molecular ion formation and pressure dependent mobility as well as finite temperature effects. We discuss the challenges associated with achieving suitable operating conditions, which lie beyond the capabilities of existing devices, using presently available or near-future manufacturing techniques.The University of Texas at Arlington NEXT group is supported by the Department of Energy, USA under Early Career Award number DE-SC0019054 (BJPJ), by Department of Energy, USA Award DE-SC0019223 (DRN), the National Science Foundation, USA under award number NSF CHE 2004111 (FWF), and the Robert A Welch Foundation, Y-2031-20200401 (FWF). The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the European Union’s Framework Programme for Research and Innovation Horizon 2020 (2014–2020) under the Grant Agreements No. 674896, 690575 and 740055; the Ministerio de Economía Competitividad and the Ministerio de Ciencia, Innovación Universidades of Spain under grants FIS2014-53371-C04, RTI2018-095979, the Severo Ochoa Program grants SEV-2014-0398 and CEX2018-000867-S, and the María de Maeztu Program MDM-2016-0692; from Fundacion Bancaria la Caixa (ID 100010434), grant code LCF/BQ/PI19/11690012; the Generalitat Valenciana of Spain under grants PROMETEO/2016/120 and SEJI/2017/011; the Portuguese FCT under project PTDC/FIS-NUC/2525/2014 and under projects UID/FIS/04559/2020 to fund the activities of LIBPhys-UC; the Pazy Foundation (Israel) under grants 877040 and 877041; the US Department of Energy under contracts number DE-AC02-06CH11357 (Argonne National Laboratory, USA), DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M). DGD acknowledges support from the Ramón y Cajal program (Spain) under contract number RYC-2015-18820. JM-A acknowledges support from Fundación Bancaria la Caixa (ID 100010434), grant code LCF/BQ/PI19/11690012, and from the Plan GenT program of the Generalitat Valenciana , grant code CIDEGENT/2019/049.Peer reviewe

Mixing and CP violation in the beauty and charm sectors at LHCb

The LHCb detector is a dedicated heavy flavour experiment operating at the Large Hadron Collider designed to pursue an extensive study of CP violation in the beauty and charm sectors. In the first part of this contribution, important milestones towards the measurement of CP violation in the beauty sector using B± and Bs0 decays are presented. In the second part, highlights of the searches of CP violation in the charm sector are reported

Measurement of the CKM phase gamma with the Babar experiment

250 páginas.Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear, de la Universidad de Valencia, y el Instituto de Física Corpuscular (IFIC). Fecha de lectura: 05-28-2010Una de las preguntas que la Fisica no ha sabido responder hasta el momento, es por que el Universo que conocemos esta formado principalmente por materia y no por partes iguales de materia y antimateria. Se puede demostrar que para pasar de una situacion de equilibrio entre materia y antimateria a una situacion de no equilibrio, se tienen que cumplir las condiciones de Sakharov, una de estas es la existencia de violacion de CP, durante los primeros segundos despues del Big Bang. El modelo Estandard acomoda la violacion de CP en procesos que involucran la interaccion debil, sin embargo esta solo puede explicar una fraccion pequeña del desequilibrio mencionado entre materia y antimateria. En el Modelo Estandard los autoestados de masa de los quarks no son los mismos que los autoestados de la interaccion debil. Existe una matriz que nos permite cambiar de una base a la otra, es la llamada matriz Cabibbo-Kobayashi-Maskawa. Si solo existieran cuatro quarks, esta matriz hubiera sido real, y la simetria de CP se conservaria. Sin embargo, con seis quarks esta matriz adquiere una fase irreducible que permite la existencia de violacion de CP. La medida de la fase gamma de la matriz de mezcla de sabores de quarks (CKM), es uno de los puntos claves del programa de Fisica de las Factorias de mesones B. La fase gamma es en la parametrizacion de Wolfeinstein, una de las dos fases que entran en el Lagrangiano del Modelo Estandard, y esta directamente relacionada con la unica fase irreducible de la matriz CKM responsable de todos los efectos de violacion de CP en el Modelo Estandard, en particular en su sector de sabor. El tema principal de la tesis es la medida de la fase gamma de la matriz CKM, usando desintegraciones del tipo B- --> D0(*)K(*)- donde D*0-->D0pi0 y D*0-->D0gamma, con D0-->Kspipi y D0-->KsKK. Se aprovecha, asi la interferencia entre las amplitudes de la desintegracion favorecida B- --> D0(*)K(*)- y la desintegracion suprimida por color B- --> barD0(*)K(*)-, debido a que el D0 y el barD0 se pueden ambos desintegrar en D0-->kspipi y D0-->kskk. Este metodo fue propuesto por A. Giri, Y. Grossman, A.Soffer y J.Zupan y a fecha de hoy, es el unico metodo que proporciona una medida de gamma usando un unico estado final en la desintegracion del D0. Otros metodos, como GLW o ADS, ayudan a mejorar la precision. Pero el metodo de Dalitz plot es el metodo de oro, hasta el momento. Se ha medido gamma= 68 +- 14 +- 4 +- 3 donde el primer error es estadistico, el segundo el error proviene de la sistematica experimental y el tercero refleja la incertidumbre en la descripcion de la amplitud de desintegracion del meson neutro D. Durante mi trabajo como autora principal en la medida del angulo gamma, el detector BaBar recolecto una muestra 122 millones de sucesos Upsilon(3S), durante el otoño de 2007, siendo este el ultimo periodo de toma de datos de Babar. Usando esta muestra de datos, contribui paracialmente, al analisi de las desintegraciones Upsilon(3S)-->Upsilon(1S)pipi con Upsilon(1S)-->lepton lepton, donde lepton= tau, mu, con la intencion de medir la razon R=BF(Upsilon(1S)-->tautau)/BF(Upsilon(1S)-->mumu). Esta medida es una prueba de universalidad leptonica y a su vez proporciona una forma de busqueda de un boson de Higgs pseudoescalar liviano, el cual aparece en escenarios mas alla del Modelo Estandard. La presencia de este estado se debe manifestar como una desviacion de la razon, R, respecto la unidad. Incluyendo todas las correcciones sistematicas, se midio R= 1.005 +- 0.013 stat +- 0.022 syst.Peer reviewe

Proceedings of SuperB Workshop VI: New Physics at the Super Flavor Factory

47 páginas, 23 figuras, 12 tablas.-- Resumen de las comunicaciones presentadas al VI SuperB Workshop celebrado del 7 al 15 de Enero de 2008 en Valencia (España), http://ific.uv.es/superb/index2.html.-- et al.The sixth SuperB Workshop was convened in response to questions posed by the INFN Review Committee, evaluating the SuperB project at the request of INFN. The working groups addressed the capability of a high-luminosity flavor factory that can gather a data sample of 50 to 75 /ab in five years to elucidate New Physics phenomena unearthed at the LHC. This report summarizes the results of the Workshop.Peer reviewe

Measurement of the B+ -> omega l(+) v and B+ -> eta l(+) v branching fractions

We present a study of the charmless semileptonic B-meson decays B+ -> omega l(+) v and B+ -> eta l(+) v. The analysis is based on 3.83 x 10(8) B (B) over bar B pairs recorded at the Gamma(4S) resonance with the BABAR detector. The omega mesons are reconstructed in the channel omega -> pi(+)pi(-)pi(0) and the eta mesons in the channels eta -> pi(+)pi(-)pi(0) and eta -> gamma gamma. We measure the branching fractions B(B+ -> omega l(+) v) = (1.14 +/- 0.16(stat) +/- 0.08(syst)) x 10(-4) and B(B+ -> eta l(+) v) = (0.31 +/- 0.06(stat) +/- 0.08(syst)) x 10(-4).We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany),INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from CONACyT (Mexico), A. P. Sloan Foundation, Research Corporation, and Alexander von Humboldt Foundation.Peer reviewe

SuperB Progress Reports -- Physics

84 páginas, 38 figuras, 25 tablas.-- This report extends and updates the studies presented in both the SuperB Conceptual Design Report in 2007 and the Proceedings of SuperB Workshop VI in Valencia in 2008.-- This report is the result of the joint e ort between the named authors and from the following contributing institutions who are working on the SuperB project: SuperB Collaboration: et al.SuperB is a high luminosity e+e- collider that will be able to indirectly probe new physics at energy scales far beyond the reach of any man made accelerator planned or in existence. Just as detailed understanding of the Standard Model of particle physics was developed from stringent constraints imposed by avour changing processes between quarks, the detailed structure of any new physics is severely constrained by avour processes. In order to elucidate this structure it is necessary to perform a number of complementary studies of a set of golden channels. With these measurements in hand, the pattern of deviations from the Standard Model behavior can be used as a test of the structure of new physics. If new physics is found at the LHC, then the many golden measurements from SuperB will help decode the subtle nature of the new physics. However if no new particles are found at the LHC, SuperB will be able to search for new physics at energy scales up to 10 - 100 TeV. In either scenario, avour physics measurements that can be made at SuperB play a pivotal role in understanding the nature of physics beyond the Standard Model. Examples for using the interplay between measurements to discriminate New Physics models are discussed in this document. SuperB is a Super Flavour Factory, in addition to studying large samples of Bu;d;s, D and decays, SuperB has a broad physics programme that includes spectroscopy both in terms of the Standard Model and exotica, and precision measurements of sin2 W. In addition to performing CP violation measurements at the (4S) and (3770), SuperB will test CPT in these systems, and lepton universality in a number of di erent processes. The multitude of rare decay measurements possible at SuperB can be used to constrain scenarios of physics beyond the Standard Model. In terms of other precision tests of the Standard Model, this experiment will be able to perform precision over-constraints of the unitarity triangle through multiple measurements of all angles and sides.Peer reviewe

Evidence for X(3872)->psi(2S)gamma in B-+/--> X(3872)K-+/- Decays and a Study of B -> cc gamma K

In a search for B -> cc gamma K decays with the BABAR detector, where cc> includes J/psi and psi(2S), and K includes K-+/-, K-S(0), and K-*(892), we find evidence for X(3872)-> J/psi gamma and X(3872)->psi(2S)gamma with 3.6 sigma and 3.5 sigma significance, respectively. We measure the product of branching fractions B(B-+/--> X(3872)K-+/-)xB(X(3872)-> J/psi gamma)=[2.8 +/- 0.8(stat)+/- 0.1(syst)]x10(-6) and B(B-+/--> X(3872)K-+/-)xB(X(3872)->psi(2S)gamma)=[9.5 +/- 2.7(stat)+/- 0.6(syst)]x10(-6).We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.Peer reviewe

Measurement of the gamma gamma* -> eta c transition form factor

We study the reaction e(+)e(-) -> e(+)e(-) eta(c), eta(c) -> KSK +/-pi(-/+) and obtain eta(c) mass and width values 2982.2 +/- 0.4 +/- 1.6 MeV/c(2) and 31.7 +/- 1.2 +/- 0.8 MeV, respectively. We find Gamma(eta(c) -> gamma gamma)B(eta(c) -> KK pi) = 0.374 +/- 0.009 +/- 0.031 keV, and measure the gamma gamma* -> eta(c) transition form factor in the momentum transfer range from 2 to 50 GeV2. The analysis is based on 469 fb(-1) of integrated luminosity collected at PEP-II with the BABAR detector at e(+)e(-) center-of-mass energies near 10.6 GeV.We thank V. L. Chernyak for useful discussions. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Science and Technology of the Russian Federation, Ministerio de Educación y Ciencia (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.Peer reviewe