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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Guido Moritz Frank Golatowski Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

A huge momentum towards IP enabled Wireless Sensor Networks (WSN) appeared through the emerging 6LoW-PAN protocols (i.e. IPv6 over Low power Wireless Personal Area Networks). By usage of existing cross domain open standards in contrast of proprietary solutions, deployments of WSNs are not tailored too tight for specific applications. Nevertheless, 6LoWPAN is only the first step for the usage of internet protocols in WSNs. Still efforts on higher layers on top of 6LoWPAN are an urgent need to provide seamless connectivity and interaction of highly resource constrained devices with higher valued services. This paper describes a new approach to bind SOAP to the emerging Constrained Application Protocol (CoAP) protocol. Thereby CoAP provides a lightweight but reliable transport binding for SOAP based protocols. Compared to the widespread TCP based HTTP binding, round trip times can be reduced by 43% in an exemplary scenario. Combined with dedicated XML compressors like the Efficient XML Interchange format (EXI), existing heavy weight SOAP based protocols become also applicable in WSNs.

关键词： Simple object access protocol XML Wireless sensor networks Protocols Reliability Payloads

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Implementing powerful Web Services for highly resource-constrained devices

Implementing powerful Web Services for highly resource-const...

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IEEE Annual Conference on Pervasive Computing and Communications Workshops (PerCom)

作者： Christian Lerche Nico Laum Guido Moritz Elmar Zeeb Frank Golatowski Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

Web Service technologies are state of the art in current enterprise distributed applications. To integrate highly resource-constrained devices, such as sensor nodes, into enterprise applications via Web Services, gateways are commonly used. Our aim was to investigate the intermediate, homogeneous communication between enterprise applications and highly resource-constrained devices. We therefore present the prototype implementation of an embedded enterprise compatible W3C Web Service solution. Furthermore, we give an evaluation of memory requirements and a timing analysis for a representative platform with 48 KiB of ROM, 10 KiB of RAM and IEEE 802.15.4 radio. As the prototype implementation requires only 8:5 KiB of ROM and 3 KiB of RAM, our results claim that enterprise Web Services, despite of prevailing assumptions, are feasible in this context.

关键词： Random access memory Logic gates XML Wireless sensor networks Protocols Service oriented architecture

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Measurement of CP violation and the Bs0 meson decay width difference with Bs0→J/ψK+K− and Bs0→J/ψπ+π− decays

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Physical Review D 2013年第11期87卷 112010-112010页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim M. Benayoun G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Fardell C. Farinelli S. Farry V. Fave D. Ferguson V. Fern Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France

The time-dependent CP asymmetry in Bs0→J/ψK+K− decays is measured using pp collision data at s=7 TeV, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector. The decay-time distribution is characterized by the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the Bs0−B¯s0 system and by a CP-violating phase ϕs. In a sample of 27 617 Bs0→J/ψK+K− decays, where the dominant contribution comes from Bs0→J/ψϕ decays, these parameters are measured to be ϕs=0.07±0.09(stat)±0.01(syst) rad, Γs≡(ΓL+ΓH)/2=0.663±0.005(stat)±0.006(syst) ps−1, and ΔΓs≡ΓL−ΓH=0.100±0.016(stat)±0.003(syst) ps−1, corresponding to the single most precise determination of ϕs, ΔΓs, and Γs. The result of performing a combined analysis with Bs0→J/ψπ+π− decays gives ϕs=0.01±0.07(stat)±0.01(syst) rad, Γs=0.661±0.004(stat)±0.006(syst) ps−1, and ΔΓs=0.106±0.011(stat)±0.007(syst) ps−1. All measurements are in agreement with the Standard Model predictions.

关键词： CP violation (Nuclear physics) PHYSICAL measurements SYMMETRY (Physics) RADIOACTIVE decay STANDARD model (Nuclear physics) LARGE Hadron Collider (France & Switzerland) PARAMETER estimation

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Impact of proactive temperature management on performance of Networks-on-Chip

Impact of proactive temperature management on performance of...

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IEEE International Symposium on System-on-Chip

作者： Tim Wegner Martin Gag Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock-Warnemuende Germany

With the progress of deep submicron technology power consumption and temperature related issues have become dominant factors for chip design. Therefore, very large-scale integrated systems like Systems-on-Chip (SoCs) are exposed to an increasing thermal stress. On the one hand, this necessitates effective mechanisms for thermal management. On the other hand, appliance of thermal management is accompanied by disturbance of system integrity and degradation of system performance. In this paper we propose to precompute and proactively manage on-chip temperature of systems based on Networks-on-Chip (NoCs). Thereby, traditional reactive approaches, utilizing the NoC infrastructure to perform thermal management, can be replaced. This results not only in shorter response times for appliance of management measures and therefore in a reduction of temperature and thermal imbalances, but also in less impairment of system integrity and performance. Simulations show that proactive management achieves improvements of nearly 150% regarding reduction of average temperature inside a 3×3 NoC compared to identical reactive approaches, while mitigating additional delay for packet transmission by more than 50%.

关键词： Thermal management Temperature measurement Temperature distribution Temperature sensors Monitoring Radio access networks System-on-a-chip

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Hex-MASCLE – hexagon based clustering with self healing abilities

Hex-MASCLE – hexagon based clustering with self healing abi...

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IEEE Conference on Wireless Communications and Networking

作者： Jakob Salzmann Ralf Behnke Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

In large wireless sensor networks, low energy consumption is a major challenge. Hence, deployed nodes have to organize themselves as energy efficient as possible to avoid unnecessary sensor and transceiver operations. The energy conserving operations are limited by the task of the network, usually the network has to guarantee complete functionality during its lifetime. The contribution of this paper completes the functionality-aware and energy-efficient clustering algorithm family MASCLE by two innovative algorithms. As already given by the MASCLE-algorithms, the proposed Hex-MASCLE algorithms combine advantages of temporal and spatial network fragmentation. In contrast to previous approaches, the shapes of the basic cells are given by regular hexagons, similar to honeycombs. In the present work, two possible versions for hexagon-based clustering with self-healing abilities are proposed and evaluated. As result, the applying sensor network achieve a significant improve of network lifetime. Additionally, the algorithms are more fault-tolerant against localization errors.

关键词： Clustering algorithms Switches Wireless sensor networks Sensors Shape Energy consumption Runtime

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Measurement of the polarization amplitudes in B0→J/ψK*(892)0 decays

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Physical Review D 2013年第5期88卷 052002-052002页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Fardell C. Fa Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil and Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Cent

An analysis of the decay B0→J/ψK*(892)0 is presented using data, corresponding to an integrated luminosity of 1.0 fb−1, collected in pp collisions at a center-of-mass energy of 7 TeV with the LHCb detector. The polarization amplitudes and the corresponding phases are measured to be |A∥|2=0.227±0.004 (stat)±0.011 (syst), |A⊥|2=0.201±0.004 (stat)±0.008 (syst), δ∥[rad]=−2.94±0.02 (stat)±0.03 (syst), and δ⊥[rad]=2.94±0.02 (stat)±0.02 (syst). Comparing B0→J/ψK*(892)0 and B¯0→J/ψK¯*(892)0 decays, no evidence for direct CP violation is found.

关键词： STANDARD model (Nuclear physics) CHERENKOV counters MUONS -- Decay EXPONENTIAL functions PROBABILITY density function

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SRD - Towards a system for the in-situ detection of the stapedius reflex

SRD - Towards a system for the in-situ detection of the stap...

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IEEE Workshop on Merging Fields of Computational Intelligence and Sensor Technology (CompSens)

作者： Marian Lüder Ralf Warmuth Enrico Heinrich Ralf Joost Ralf Salomon Faculty of Computer Science and Electrical Engineering Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

Cochlea implants help regain the auditory sense in cases where the cochlea has lost its ability to transform incoming sound signals into electrical stimulation for the auditory cortex. A cochlea implant requires a first calibration process, which is often based on the well-known stapedius reflex. This paper proposes a system, called the stapedius reflex detector (SRD), that aims to provide a step towards the automatic in-situ exploitation of this reflex. A first prototype has been implemented on a field-programmable gate array. The first validation experiments indicate that the system is properly working and ready for further development that aims to integrate this system into the clinical process.

关键词： Implants Ear Hair Muscles Hardware Electrodes Auditory system

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Study of decays with first observation of and

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Journal of High Energy Physics 2013年第10期2013卷 1-22页

作者： Aaij, R. Adeva, B. Adinolfi, M. Adrover, C. Affolder, A. Ajaltouni, Z. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A. A. Amato, S. Amerio, S. Amhis, Y. Anderlini, L. Anderson, J. Andreassen, R. Andrews, J. E. Appleby, R. B. Aquines Gutierrez, O. Archilli, F. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Bachmann, S. Back, J. J. Baesso, C. Balagura, V. Baldini, W. Barlow, R. J. Barschel, C. Barsuk, S. Barter, W. Bauer, Th. Bay, A. Beddow, J. Bedeschi, F. Bediaga, I. Belogurov, S. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Benton, J. Berezhnoy, A. Bernet, R. Bettler, M.-O. van Beuzekom, M. Bien, A. Bifani, S. Bird, T. Bizzeti, A. Bjørnstad, P. M. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Bondar, A. Bondar, N. Bonivento, W. Borghi, S. Borgia, A. Bowcock, T. J. V. Bowen, E. Bozzi, C. Brambach, T. van den Brand, J. Bressieux, J. Brett, D. Britsch, M. Britton, T. Brook, N. H. Brown, H. Burducea, I. Bursche, A. Busetto, G. Buytaert, J. Cadeddu, S. Callot, O. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carranza-Mejia, H. Carson, L. Carvalho Akiba, K. Casse, G. Castillo Garcia, L. Cattaneo, M. Cauet, Ch. Cenci, R. Charles, M. Charpentier, Ph. Chen, P. Chiapolini, N. Chrzaszcz, M. Ciba, K. Cid Vidal, X. Ciezarek, G. Clarke, P. E. L. Clemencic, M. Cliff, H. V. Closier, J. Coca, C. Coco, V. Cogan, J. Cogneras, E. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombes, M. Coquereau, S. Corti, G. Couturier, B. Cowan, G. A. Cowie, E. Craik, D. C. Cunliffe, S. Currie, R. D’Ambrosio, C. David, P. David, P. N. Y. Davis, A. De Bonis, I. De Bruyn, K. De Capua, S. De Cian, M. De Miranda, J. M. De Paula, L. De Silva, W. De Simone, P. Decamp, D. Deckenhoff, M. Del Buono, L. Déléage, N. Derkach, D. Deschamps, O. Dettori, F. Di Canto, A. Dijkstra, H. Dogaru, M. Donleavy, S. Dordei, F. Dosil Suárez, A. Dossett, D. Dovbnya, A. Dupertuis, F. Durante, P. Dzhelyadin, R. Dziurd Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol U.K. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool U.K. Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow U.K. Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Università di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati U.S.A. University of Maryland College Park U.S.A. School of Physics and Astronomy University of Manchester Manchester U.K. Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse U.S.A. Università della Basilicata Potenza Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry U.K. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil associated to 2 Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge U.K. Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF)

A search for charmless three-body decays of B 0 and $ B_s^0 $ mesons with a $ K_{\mathrm{S}}^0 $ meson in the final state is performed using the pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected at a centre-of-mass energy of 7 TeV recorded by the LHCb experiment. Branching fractions of the $ B_{(s)}^0\to K_{\mathrm{S}}^0{h^{+}}{h^{{\prime -}}} $ decay modes (h (′) = π, K), relative to the well measured $ {B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}} $ decay, are obtained. First observation of the decay modes $ B_s^0\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }} $ and $ B_s^0\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}} $ and confirmation of the decay $ {B^0}\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }} $ are reported. The following relative branching fraction measurements or limits are obtained $ \begin{array}{*{20}{c}} {\frac{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.128\pm 0.017\left( {\mathrm{stat}.} \right)\pm 0.009\left( {\mathrm{syst}.} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{K^{+}}{K^{-}}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.385\pm 0.031\left( {\mathrm{stat}.} \right)\pm 0.023\left( {\mathrm{syst}.} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {B_s^0\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.29\pm 0.06\left( {\mathrm{stat}.} \right)\pm 0.03\left( {\mathrm{syst}.} \right)\pm 0.02\left( {{{{{f_s}}} \left/ {{{f_d}}} \right.}} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {B_s^0\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=1.48\pm 0.12\left( {\mathrm{stat}.} \right)\pm 0.08\left( {\mathrm{syst}.} \right)\pm 0.12\left( {{{{{f_s}}} \left/ {{{f_d}}} \right.}} \right)} \hfill \\ {\frac{{\ma

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First observation of B¯0→J/ψK+K− and search for B¯0→J/ψϕ decays

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Physical Review D 2013年第7期88卷 072005-072005页

作者： R. Aaij B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier P. Chen S.-F. Cheung N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Falab Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio United States University of Maryland College Park Maryland United States School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York United States Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausann

The first observation of the B¯0→J/ψK+K− decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B¯0→J/ψK+K−)=(2.53±0.31±0.19)×10−6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B¯0→J/ψK+K− decay is performed to separate resonant and nonresonant contributions in the K+K− spectrum. Evidence of the a0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B¯0→J/ψa0(980),a0(980)→K+K−)=(4.70±3.31±0.72)×10−7, yielding an upper limit of B(B¯0→J/ψa0(980),a0(980)→K+K−)<9.0×10−7 at 90% confidence level. No evidence of the resonant decay B¯0→J/ψϕ is found, and an upper limit on its branching fraction is set to be B(B¯0→J/ψϕ)<1.9×10−7 at 90% confidence level.

关键词： BRANCHING ratios (Nuclear physics) RADIOACTIVE decay CENTER of mass LUMINOSITY LARGE Hadron Collider (France & Switzerland) STANDARD deviations SPECTRUM analysis

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Studies of the decays B+→pp¯h+ and observation of B+→Λ¯(1520)p

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Physical Review D 2013年第5期88卷 052015-052015页

作者： R. Aaij B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Falabella C. Färb Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil associated to Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pis

Dynamics and direct CP violation in three-body charmless decays of charged B mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the pp¯ rest frame is measured. No significant CP asymmetry in B+→pp¯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ¯(1520)(→K+p¯)p near the K+p¯ threshold and measure B(B+→Λ¯(1520)p)=(3.9−0.9+1.0(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

关键词： MESONS PROTON decay SPECIAL relativity (Physics) VERTEX detectors DIPOLE moments MOMENTUM distributions DECAY

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