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1. Secondary scintillation yield of xenon with sub-percent levels of CO2 additive for rare-event detection

Author

C.A.O. Henriques, E.D.C. Freitas, C.D.R. Azevedo, D. González-Díaz, R.D.P. Mano, M.R. Jorge, L.M.P. Fernandes, C.M.B. Monteiro, J.J. Gómez-Cadenas, V. Álvarez, J.M. Benlloch-Rodríguez, F.I.G.M. Borges, A. Botas, S. Cárcel, J.V. Carríon, S. Cebrían, C.A.N. Conde, J. Díaz, M. Diesburg, R. Esteve, R. Felkai, P. Ferrario, A.L. Ferreira, A. Goldschmidt, R.M. Gutiérrez, J. Hauptman, A.I. Hernandez, J.A. Hernando Morata, V. Herrero, B.J.P. Jones, L. Labarga, A. Laing, P. Lebrun, I. Liubarsky, N. López-March, M. Losada, J. Martín-Albo, G. Martínez-Lema, A. Martínez, A.D. McDonald, F. Monrabal, F.J. Mora, L.M. Moutinho, J. Muñoz Vidal, M. Musti, M. Nebot-Guinot, P. Novella, D.R. Nygren, B. Palmeiro, A. Para, J. Pérez, M. Querol, J. Renner, L. Ripoll, J. Rodríguez, L. Rogers, F.P. Santos, J.M.F. dos Santos, A. Simón, C. Sofka, M. Sorel, T. Stiegler, J.F. Toledo, J. Torrent, Z. Tsamalaidze, J.F.C.A. Veloso, R. Webb, J.T. White, and N. Yahlali

Subjects
Physics, QC1-999
Abstract

Xe–CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications in the important field of rare event detection such as directional dark matter, double electron capture and double beta decay detection. The addition of CO2 to pure xenon at the level of 0.05–0.1% can reduce significantly the scale of electron diffusion from 10 mm/m to 2.5 mm/m, with high impact on the discrimination efficiency of the events through pattern recognition of the topology of primary ionization trails. We have measured the electroluminescence (EL) yield of Xe–CO2 mixtures, with sub-percent CO2 concentrations. We demonstrate that the EL production is still high in these mixtures, 70% and 35% relative to that produced in pure xenon, for CO2 concentrations around 0.05% and 0.1%, respectively. The contribution of the statistical fluctuations in EL production to the energy resolution increases with increasing CO2 concentration, being smaller than the contribution of the Fano factor for concentrations below 0.1% CO2. Keywords: Double beta decay, Neutrino, Rare event detection, Electroluminescence, Secondary scintillation, Xenon

Published
2017
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2. Sensitivity of a tonne-scale NEXT detector for neutrinoless double-beta decay searches

Author

R. Guenette, L. Ripoll, J.F. Toledo, S. Cárcel, B. J. P. Jones, P. Lebrun, A. Laing, C. Adams, N. Byrnes, A. Martínez, L.M.P. Fernandes, Javier Pérez, Iván Rivilla, F. Monrabal, I. J. Arnquist, N. López-March, J.M.R. Teixeira, Javier Rodríguez, F.I.G.M. Borges, M. Kekic, T. Contreras, A.D. McDonald, Celia Rogero, M. Losada, S. Cebrián, C. Newhouse, A.A. Denisenko, C.A.N. Conde, R.D.P. Mano, B. Palmeiro, J.A. Hernando Morata, L. Rogers, C. Romo-Luque, G. Díaz, A. Simón, Z. E. Meziani, R. Felkai, Zoraida Freixa, A. Goldschmidt, A. Usón, L. Labarga, E. Church, J. Hauptman, J.M.F. dos Santos, Kevin Bailey, C.M.B. Monteiro, J. Torrent, F.P. Santos, J.F.C.A. Veloso, E.D.C. Freitas, P. Herrero, R. Weiss-Babai, Diego González-Díaz, Y. Rodriguez Garcia, D.R. Nygren, Paola Ferrario, J. Ho, J. Renner, T.T. Vuong, Víctor H. Alvarez, J.T. White, A. Redwine, F.J. Mora, Y. Ifergan, Lior Arazi, V. Herrero, C.A.O. Henriques, E. Oblak, N. Yahlali, G. Martínez-Lema, K. Hafidi, M. Querol, A. Para, R. González, Romain Esteve, Roberto Gutiérrez, M. Sorel, C. Stanford, J. Escada, J. Haefner, A.L. Ferreira, J.V. Carrión, B. Romeo, F. Ballester, Frank W. Foss, C.D.R. Azevedo, S. Gosh, P. Thapa, R. C. Webb, J. M. Benlloch-Rodríguez, J. Muñoz Vidal, J. S. Díaz, M. Martínez-Vara, K. Woodruff, P. Novella, J. Martín-Albo, J.J. Gómez-Cadenas, J. Generowicz, European Commission, European Research Council, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat Valenciana, Fundação para a Ciência e a Tecnologia (Portugal), Fundación 'la Caixa', and Department of Energy (US)

Subjects
Nuclear and High Energy Physics, chemistry.chemical_element, QC770-798, Parameter space, 01 natural sciences, 7. Clean energy, Atomic, Nuclear physics, Xenon, Particle and Plasma Physics, Double beta decay, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), Nuclear, Sensitivity (control systems), 010306 general physics, Mathematical Physics, Physics, Quantum Physics, 010308 nuclear & particles physics, Raigs beta -- Desintegració, Detector, Molecular, Detectors, Nuclear & Particles Physics, chemistry, Beta rays -- Decay, Neutrino, Tonne, Order of magnitude
Abstract

The NEXT collaboration: et al., The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta (0νββ) decay of 136Xe using high-pressure xenon gas TPCs with electroluminescent amplification. A scaled-up version of this technology with about 1 tonne of enriched xenon could reach in less than 5 years of operation a sensitivity to the half-life of 0νββ decay better than 1027 years, improving the current limits by at least one order of magnitude. This prediction is based on a well-understood background model dominated by radiogenic sources. The detector concept presented here represents a first step on a compelling path towards sensitivity to the parameter space defined by the inverted ordering of neutrino masses, and beyond., 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 y Competitividad and the Ministerio de Ciencia, Innovación y 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 MDM2016-0692; 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), DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M) and DE-SC0019223 / DE-SC0019054 (University of Texas at Arlington); and the University of Texas at Arlington. 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.

Published
2021

3. Demonstration of background rejection using deep convolutional neural networks in the NEXT experiment

Author

T. Contreras, Z. E. Meziani, R. Weiss-Babai, I. J. Arnquist, J.V. Carrión, J. Renner, N. López-March, L. Rogers, F.J. Mora, J. Generowicz, T.M. Stiegler, Vicente Herrero, F.P. Santos, G. Martínez-Lema, C.M.B. Monteiro, R.D.P. Mano, L.M.P. Fernandes, J.M. Benlloch-Rodríguez, P. Herrero, C. Adams, N. Byrnes, B. Palmeiro, J.A. Hernando Morata, N. Yahlali, D. González-Díaz, Y. Rodriguez Garcia, J. S. Díaz, M. Martínez-Vara, P. Novella, F.I.G.M. Borges, Romain Esteve, J.F.C.A. Veloso, E.D.C. Freitas, J. Martin-Albo, M. Del Tutto, A. Usón, R. Guenette, F. Monrabal, Roberto Gutiérrez, A.D. McDonald, C.D.R. Azevedo, J.T. White, J.F. Toledo, S. Cárcel, P. Lebrun, A. Martínez, M. Diesburg, E. Church, A. Laing, Kevin Bailey, J. Rodríguez, M. Kekic, A.B. Redwine, C.A.O. Henriques, J. Escada, L. Ripoll, J. Torrent, Lior Arazi, B. J. P. Jones, Víctor H. Alvarez, J. Haefner, B. Romeo, R. Felkai, M. Losada, A. Goldschmidt, J. Hauptman, K. Woodruff, L. Labarga, Y. Ifergan, J.M.F. dos Santos, C. Romo-Luque, Javier Pérez, S. Cebrián, Sudip Ghosh, R. C. Webb, G. Díaz, F. Ballester, Paola Ferrario, D.R. Nygren, A.F.M. Fernandes, M. Querol, C. Sofka, A. Para, M. Sorel, A.L. Ferreira, K. Hafidi, C.A.N. Conde, A. Simón, J.J. Gómez-Cadenas, J. Muñoz Vidal, and UAM. Departamento de Física Teórica

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Calibration (statistics), Computer Science::Neural and Evolutionary Computation, Nuclear physics, FOS: Physical sciences, Topology (electrical circuits), 01 natural sciences, Convolutional neural network, Atomic, Partícules (Física nuclear), High Energy Physics - Experiment, Interaccions electró-positró, TECNOLOGIA ELECTRONICA, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, Double beta decay, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), Nuclear, Nuclear Matrix, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Electron-positron interactions, Mathematical Physics, Particles (Nuclear physics), Physics, Quantum Physics, 010308 nuclear & particles physics, business.industry, Event (computing), Network on, SIGNAL (programming language), Molecular, Física, Pattern recognition, Detector, Instrumentation and Detectors (physics.ins-det), Beta Decay, Nuclear & Particles Physics, Doble desintegració beta, Identification (information), lcsh:QC770-798, Física nuclear, Artificial intelligence, business
Abstract

[EN] Convolutional neural networks (CNNs) are widely used state-of-the-art computer vision tools that are becoming increasingly popular in high-energy physics. In this paper, we attempt to understand the potential of CNNs for event classification in the NEXT experiment, which will search for neutrinoless double-beta decay in Xe-136. To do so, we demonstrate the usage of CNNs for the identification of electron-positron pair production events, which exhibit a topology similar to that of a neutrinoless double-beta decay event. These events were produced in the NEXT-White high-pressure xenon TPC using 2.6 MeV gamma rays from a Th-228 calibration source. We train a network on Monte Carlo-simulated events and show that, by applying on-the-fly data augmentation, the network can be made robust against differences between simulation and data. The use of CNNs offers significant improvement in signal efficiency and background rejection when compared to previous non-CNN-based analyses, This study used computing resources from Artemisa, co-funded by the European Union through the 2014-2020 FEDER Operative Programme of the Comunitat Valenciana, project DIFEDER/2018/048. This research used resources of the Argonne Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract DE-AC02-06CH11357. The NEXT collaboration acknowledges support from the following agencies and institutions: Xunta de Galicia (Centro singularde investigacion de Galicia accreditation 2019-2022), by European Union ERDF, and by the "Maria de Maeztu" Units of Excellence program MDM-2016-0692 and the Spanish Research State Agency"; 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 Economia y Competitividad and the Ministerio de Ciencia, Innovacion y Universidades of Spain under grants FIS2014-53371-C04, RTI2018-095979, the Severo Ochoa Program grants SEV-20140398 and CEX2018-000867-S; the GVA 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 U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M) and DE-SC0019223/DE SC0019054 (University of Texas at Arlington); and the University of Texas at Arlington. DGD acknowledges Ramon y Cajal program (Spain) under contract number RYC-2015 18820. JMA acknowledges support from Fundacion Bancaria "la Caixa" (ID 100010434), grant code LCF/BQ/PI19/11690012. We also warmly acknowledge the Laboratori Nazionali del Gran Sasso (LNGS) and the Dark Side collaboration for their help with TPB coating of various parts of the NEXT-White TPC. Finally, we are grateful to the Laboratorio Subterraneo de Canfranc for hosting and supporting the NEXT experiment.

Published
2021

4. Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Author

Javier Pérez, Javier Rodríguez, T. Contreras, C. Newhouse, Marta Losada, T.T. Vuong, L. Rogers, A.A. Denisenko, K. Woodruff, S. Cebrián, N. López-March, K. Hafidi, R. C. Webb, J.V. Carrión, J. Torrent, J. M. Benlloch-Rodríguez, L. Ripoll, J.T. White, P. Lebrun, B. J. P. Jones, J. Muñoz Vidal, R.D.P. Mano, Iván Rivilla, F. Monrabal, B. Aparicio, A.B. Redwine, Y. Ifergan, C.A.O. Henriques, F.P. Cossío, I.J. Arnquist, J. Ho, R. Guenette, Z.-E. Meziani, J.F. Toledo, B. Palmeiro, Kevin Bailey, C. Adams, A.D. McDonald, N. Byrnes, S. Cárcel, R. Felkai, A.I. Aranburu, J.A. Hernando Morata, J. S. Díaz, M. Martínez-Vara, P. Novella, L.M.P. Fernandes, J.M.R. Teixeira, J. Martín-Albo, J.J. Gómez-Cadenas, C. Stanford, J. Escada, F.P. Santos, C.D.R. Azevedo, F.I.G.M. Borges, E. Oblak, A. Para, A. Usón, R. González, M. Querol, P. Herrero, M. Sorel, J.F.C.A. Veloso, E.D.C. Freitas, C.A.N. Conde, Luis Labarga, C.M.B. Monteiro, A.L. Ferreira, H. Almazán, Zoraida Freixa, A. Goldschmidt, J. Hauptman, Ana Martínez, Diego González-Díaz, Y. Rodriguez Garcia, J.M.F. dos Santos, J. Haefner, Víctor H. Alvarez, Lior Arazi, Frank W. Foss, Roberto Gutiérrez, V. Herrero, E. Church, N. Yahlali, C. Romo-Luque, Romain Esteve, F. Ballester, S. Gosh, Paola Ferrario, D. R. Nygren, M. Kekic, A. Laing, M. Odriozola-Gimeno, P. Thapa, J. Generowicz, R. Weiss-Babai, J. Renner, G. Díaz, G. Martínez-Lema, B. Romeo, F.J. Mora, Celia Rogero, A. Simón, and European Commission

Subjects
Nuclear and High Energy Physics, Ionization, Physics - Instrumentation and Detectors, Ionització, FOS: Physical sciences, double beta decay, Richardson–Lucy deconvolution, Bragg peak, Electron, QC770-798, 01 natural sciences, Signal, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Double beta decay, Nuclear and particle physics. Atomic energy. Radioactivity, gas, 0103 physical sciences, 010306 general physics, Physics, 010308 nuclear & particles physics, Raigs beta -- Desintegració, Instrumentation and Detectors (physics.ins-det), Computational physics, dark matter and double beta decay (experiments), Beta rays -- Decay, Deconvolution, Energy (signal processing)
Abstract

The NEXT collaboration: et al., Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ∼ 1027 yr, requiring suppressing backgrounds to < 1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ∼ 5 when reconstructing electron-positron pairs in the 208Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterráneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ∼ 10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV e−e+ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency.

Published
2021

5. Sensitivity of the NEXT experiment to Xe-124 double electron capture

Author

C.M.B. Monteiro, J.F.C.A. Veloso, G. Díaz, E.D.C. Freitas, B. Palmeiro, Y. Rodriguez Garcia, R. Weiss-Babai, J. Muñoz Vidal, F.P. Santos, Saunab Ghosh, Sandra K. Johnston, J.T. White, F. Ballester, J. Renner, Lior Arazi, J. Generowicz, A.B. Redwine, P. Herrero, V. Herrero, G. Martínez-Lema, J.M. Benlloch-Rodríguez, Paola Ferrario, A. Goldschmidt, J. Hauptman, L. Ripoll, B. J. P. Jones, J. S. Díaz, M. Martínez-Vara, P. Novella, F. Monrabal, J. Martín-Albo, J.J. Gómez-Cadenas, I.J. Arnquist, N. López-March, C.D.R. Azevedo, Kevin Bailey, A.D. McDonald, C. Adams, N. Byrnes, J. Torrent, Jose Repond, M. Kekic, S. Riordan, E. Church, R.D.P. Mano, T. Contreras, M. Querol, Javier Pérez, J.V. Carrión, C. Romo-Luque, L.M.P. Fernandes, B. Romeo, C. Sofka, C.A.O. Henriques, F.J. Mora, J.A. Hernando Morata, K. Woodruff, Jose A. Rodriguez, D. González-Díaz, L. Rogers, A. Usón, Marta Losada, C.A.N. Conde, Luis Labarga, T.M. Stiegler, A. Para, Víctor H. Alvarez, D. R. Nygren, F.I.G.M. Borges, A. Laing, J. Haefner, A. Simón, N. Yahlali, M. Sorel, A.F.M. Fernandes, P. Lebrun, S. Cebrián, Ana Martínez, A.L. Ferreira, Romain Esteve, R. C. Webb, M. Diesburg, R. Guenette, J. Escada, J.F. Toledo, S. Cárcel, K. Hafidi, J.M.F. dos Santos, Y. Ifergan, R. Felkai, Roberto Gutiérrez, and UAM. Departamento de Física Teórica

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Electron capture, Dark Matter and Double Beta Decay, Extrapolation, FOS: Physical sciences, chemistry.chemical_element, Electrons, Electron, 01 natural sciences, 7. Clean energy, Atomic, High Energy Physics - Experiment, TECNOLOGIA ELECTRONICA, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, Particle and Plasma Physics, Double beta decay, 0103 physical sciences, Nuclear Matrix, Nuclear, Sensitivity (control systems), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Mathematical Physics, Physics, Quantum Physics, Isotope, 010308 nuclear & particles physics, Raigs beta -- Desintegració, Detector, Física, Molecular, Detectors, Instrumentation and Detectors (physics.ins-det), Beta Decay, Nuclear & Particles Physics, chemistry, 13. Climate action, Beta rays -- Decay
Abstract

[EN] Double electron capture by proton-rich nuclei is a second-order nuclear process analogous to double beta decay. Despite their similarities, the decay signature is quite di erent, potentially providing a new channel to measure the hypothesized neutrinoless mode of these decays. The Standard-Model-allowed two-neutrino double electron capture has been predicted for a number of isotopes, but only observed in 78Kr, 130Ba and, recently, 124Xe. The sensitivity to this decay establishes a benchmark for the ultimate experimental goal, namely the potential to discover also the lepton-number-violating neutrinoless version of this process. Here we report on the current sensitivity of the NEXT-White detector to 124Xe 2 ECEC and on the extrapolation to NEXT-100. Using simulated data for the 2 ECEC signal and real data from NEXT-White operated with 124Xe-depleted gas as background, we de ne an optimal event selection that maximizes the NEXT-White sensitivity. We estimate that, for NEXT-100 operated with xenon gas isotopically enriched with 1 kg of 124Xe and for a 5-year run, a sensitivity to the two-neutroni double electron capture half-life of 6x10exp22 years (at 90% con dence level) or better can be reached., 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 Marie Sklodowska-Curie Grant Agreements No. 674896, 690575 and 740055; the Ministerio de Economia y Competitividad and the Ministerio de Ciencia, Innovacion y Universidades of Spain under grants FIS2014-53371-C04, RTI2018-095979, the Severo Ochoa Program grants SEV-2014-0398 and CEX2018-000867-S, and the Maria de Maeztu Program MDM-2016-0692; the GVA of Spain under grants PROMETEO/2016/120 and SEJI/2017/011; the Portuguese FCT under project PTDC/FIS-NUC/2525/2014, under project UID/FIS/04559/2013 to fund the activities of LIBPhys, and under grants PD/BD/105921/2014, SFRH/BPD/109180/2015 and SFRH/BPD/76842/2011; the U.S. Department of Energy under contracts number DE-AC02-06CH11357 (Argonne National Laboratory), DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M) and DE-SC0019223/DE-SC0019054 (University of Texas at Arlington); and the University of Texas at Arlington. DGD acknowledges Ramon y Cajal program (Spain) under contract number RYC-2015-18820. We also warmly acknowledge the Laboratori Nazionali del Gran Sasso (LNGS) and the Dark Side collaboration for their help with TPB coating of various parts of the NEXT-White TPC. Finally, we are grateful to the Laboratorio Subterraneo de Canfranc for hosting and supporting the NEXT experiment

Published
2021

6. Helium–Xenon mixtures to improve the topological signature in high pressure gas xenon TPCs

Author

F.J. Mora, T.M. Stiegler, S. Riordan, A. Laing, F.I.G.M. Borges, R. Felkai, G. Martínez-Lema, J. Renner, A.D. McDonald, J.F.C.A. Veloso, E.D.C. Freitas, J. Muñoz Vidal, A. Goldschmidt, J. Hauptman, L.M. Moutinho, J. Torrent, Javier Rodríguez, L.M.P. Fernandes, F. Monrabal, Jose Repond, Víctor H. Alvarez, B. Palmeiro, J.V. Carrión, C.A.N. Conde, Paola Ferrario, A. Simón, S. Cebrián, M. Musti, L. Rogers, J. S. Díaz, P. Novella, J. Martín-Albo, Lior Arazi, A. Para, J.J. Gómez-Cadenas, M. Losada, R. C. Webb, N. López-March, M. Sorel, C. Romo-Luque, K. Hafidi, C.D.R. Azevedo, C. Adams, V. Herrero, D.R. Nygren, A.L. Ferreira, A. Botas, Roberto Gutiérrez, N. Yahlali, J.A. Hernando Morata, A.I. Hernandez, Z. Tsamalaidze, M. Nebot-Guinot, Romain Esteve, L. Labarga, F.P. Santos, C.A.O. Henriques, J.F. Toledo, C. Sofka, S. Cárcel, P. Lebrun, A. Martínez, M. Diesburg, J. Escada, M. Querol, Sandra K. Johnston, J.T. White, C.M.B. Monteiro, Diego González-Díaz, J.M. Benlloch-Rodríguez, J.M.F. dos Santos, Javier Pérez, L. Ripoll, B. J. P. Jones, and R. Guenette

Subjects
Enginyeria -- Instruments, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Electron, Electroluminescence, 7. Clean energy, 01 natural sciences, Engineering instruments, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Xenon, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), Diffusion (business), 010306 general physics, Nuclear Experiment, Instrumentation, Detectors de radiació, Helium, Physics, Time projection chamber, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), 3. Good health, chemistry, Nuclear counters, Electroluminescència, Atomic physics
Abstract

Within the framework of xenon-based double beta decay experiments, we propose the possibility to improve the background rejection of an electroluminescent Time Projection Chamber (EL TPC) by reducing the diffusion of the drifting electrons while keeping nearly intact the energy resolution of a pure xenon EL TPC. Based on state-of-the-art microscopic simulations, a substantial addition of helium, around 10 or 15~\%, may reduce drastically the transverse diffusion down to 2.5~mm/$\sqrt{\mathrm{m}}$ from the 10.5~mm/$\sqrt{\mathrm{m}}$ of pure xenon. The longitudinal diffusion remains around 4~mm/$\sqrt{\mathrm{m}}$. Light production studies have been performed as well. They show that the relative variation in energy resolution introduced by such a change does not exceed a few percent, which leaves the energy resolution practically unchanged. The technical caveats of using photomultipliers close to an helium atmosphere are also discussed in detail., 8 pages, 7 figures

Published
2018

7. Electroluminescence TPCs at the thermal diffusion limit

Author

A. Laing, M. Losada, C. Romo-Luque, F. Ballester, Paola Ferrario, Javier Rodríguez, N. López-March, J.M.F. dos Santos, D. González-Díaz, L. Rogers, Sandra K. Johnston, L. Ripoll, B. J. P. Jones, R.D.P. Mano, A. Para, R. Felkai, Jose Repond, J.A. Hernando Morata, M. Sorel, J.V. Carrión, D.R. Nygren, F.I.G.M. Borges, J.F.C.A. Veloso, E.D.C. Freitas, A.L. Ferreira, J.T. White, Roberto Gutiérrez, G. Martínez-Lema, M. Nebot-Guinot, S. Cebrián, J. S. Díaz, P. Novella, J. Martín-Albo, J.J. Gómez-Cadenas, Víctor H. Alvarez, R. C. Webb, Lior Arazi, J. Generowicz, Javier Pérez, R. Guenette, J.F. Toledo, S. Cárcel, C.M.B. Monteiro, P. Lebrun, A. Martínez, J. Muñoz Vidal, L. Labarga, A. Botas, F.P. Santos, M. R. Jorge, M. Diesburg, J. Escada, C. Adams, C. Sofka, J. Torrent, A.F.M. Fernandes, J.M. Benlloch-Rodríguez, F. Monrabal, M. Querol, C.D.R. Azevedo, C.A.N. Conde, A. Simón, M. Musti, S. Riordan, K. Hafidi, C.A.O. Henriques, A. Goldschmidt, J. Hauptman, Kevin Bailey, A.D. McDonald, F.J. Mora, T.M. Stiegler, L.M.P. Fernandes, F. Psihas, A.I. Hernandez, J. Renner, M. Kekic, N. Yahlali, Romain Esteve, B. Palmeiro, V. Herrero, UAM. Departamento de Física Teórica, European Commission, and Ministerio de Economía y Competitividad (España)

Subjects
Electroluminiscència, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Dark Matter and Double Beta Decay, FOS: Physical sciences, chemistry.chemical_element, Electron, Atomic, 01 natural sciences, 7. Clean energy, Mathematical Sciences, High Energy Physics - Experiment, TECNOLOGIA ELECTRONICA, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, Xenon, Ionization, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), Nuclear, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Diffusion (business), 010306 general physics, Mathematical Physics, Physics, Quantum Physics, 010308 nuclear & particles physics, Resolution (electron density), Molecular, Física, Nuclear energy, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Particle correlations and fluctuations, 85-05, Electroluminescence, chemistry, Rare decay, Yield (chemistry), Photon production, Physical Sciences, Scintillation counter, Energia nuclear, lcsh:QC770-798, Atomic physics, Energy (signal processing)
Abstract

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, The NEXT experiment aims at searching for the hypothetical neutrinoless double-beta decay from the 136Xe isotope using a high-purity xenon TPC. Efficient discrimination of the events through pattern recognition of the topology of primary ionisation tracks is a major requirement for the experiment. However, it is limited by the diffusion of electrons. It is known that the addition of a small fraction of a molecular gas to xenon reduces electron diffusion. On the other hand, the electroluminescence (EL) yield drops and the achievable energy resolution may be compromised. We have studied the effect of adding several molecular gases to xenon (CO2, CH4 and CF4) on the EL yield and energy resolution obtained in a small prototype of driftless gas proportional scintillation counter. We have compared our results on the scintillation characteristics (EL yield and energy resolution) with a microscopic simulation, obtaining the diffusion coefficients in those conditions as well. Accordingly, electron diffusion may be reduced from about 10 mm/m for pure xenon down to 2.5 mm/m using additive concentrations of about 0.05%, 0.2% and 0.02% for CO2, CH4 and CF4, respectively. Our results show that CF4 admixtures present the highest EL yield in those conditions, but very poor energy resolution as a result of huge fluctuations observed in the EL formation. CH4 presents the best energy resolution despite the EL yield being the lowest. The results obtained with xenon admixtures are extrapolated to the operational conditions of the NEXT-100 TPC. CO2 and CH4 show potential as molecular additives in a large xenon TPC. While CO2 has some operational constraints, making it difficult to be used in a large TPC, CH4 shows the best performance and stability as molecular additive to be used in the NEXT-100 TPC, with an extrapolated energy resolution of 0.4% at 2.45 MeV for concentrations below 0.4%, which is only slightly worse than the one obtained for pure xenon. We demonstrate the possibility to have an electroluminescence TPC operating very close to the thermal diffusion limit without jeopardizing the TPC performance, if CO2 or CH4 are chosen as additives.[Figure not available: see fulltext.], 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 Marie Skłodowska-Curie Grant Agreements No.674896, 690575 and 740055; the Ministerio de Economía y Competitividad of Spain under grants FIS2014-53371-C04, the Severo Ochoa Program SEV-2014-0398 and the María de Maetzu Program MDM-2016-0692;the GVA of Spain under grants PROMETEO/2016/120 and SEJI/2017/011; the Portuguese FCT under project PTDC/FIS-NUC/2525/2014, under project UID/FIS/04559/2013 to fund the activities of LIBPhys, and under grants PD/BD/105921/2014, SFRH/BPD/109180/2015 and SFRH/BPD/76842/2011; the U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020(Texas A&M) and DE-SC0017721 (University of Texas at Arlington); and the University of Texas at Arlington. DGD acknowledges Ramon y Cajal program (Spain) under contract number RYC-2015-18820. We also warmly acknowledge the Laboratori Nazionalidel Gran Sasso (LNGS) and the Dark Side collaboration for their help with TPB coatingof various parts of the NEXT-White TPC.

Published
2019

8. Initial results on energy resolution of the NEXT-White detector

Author

L. Labarga, J. S. Díaz, P. Novella, N. Yahlali, J. Martín-Albo, J.J. Gómez-Cadenas, F. Ballester, G. Martínez-Lema, Romain Esteve, S. Cebrián, Jose Repond, R. C. Webb, Sandra K. Johnston, Paola Ferrario, L. Rogers, J.V. Carrión, R. Guenette, N. López-March, M. Losada, J.F. Toledo, S. Cárcel, C. Sofka, P. Lebrun, R.D.P. Mano, A. Martínez, F.P. Santos, Jose A. Rodriguez, Kevin Bailey, A.D. McDonald, J.M. Benlloch-Rodríguez, M. Kekic, J.A. Hernando Morata, C. Romo-Luque, C.M.B. Monteiro, J.F.C.A. Veloso, E.D.C. Freitas, J. Muñoz Vidal, Víctor H. Alvarez, A.I. Hernandez, F. Psihas, Diego González-Díaz, A. Laing, F.J. Mora, T.M. Stiegler, B. Palmeiro, Lior Arazi, C.A.O. Henriques, R. Felkai, C.D.R. Azevedo, M. Diesburg, F.I.G.M. Borges, A. Botas, S. Riordan, A. Para, J. Escada, M. Sorel, L.M.P. Fernandes, F. Monrabal, D.R. Nygren, A.L. Ferreira, K. Hafidi, V. Herrero, M. Nebot-Guinot, A. Goldschmidt, J. Hauptman, J.M.F. dos Santos, C.A.N. Conde, Javier Pérez, A. Simón, J. Renner, M. Musti, L. Ripoll, B. J. P. Jones, J. Torrent, J. Generowicz, Roberto Gutiérrez, M. Querol, C. Adams, A.F.M. Fernandes, and J.T. White

Subjects
High energy, Physics - Instrumentation and Detectors, Time projection chambers, chemistry.chemical_element, FOS: Physical sciences, 01 natural sciences, Xenon, Optics, Engineering, Affordable and Clean Energy, 0103 physical sciences, 010306 general physics, Instrumentation, Mathematical Physics, Large detector-systems performance, Physics, 010308 nuclear & particles physics, business.industry, Detector, Resolution (electron density), Linearity, Instrumentation and Detectors (physics.ins-det), Double-beta decay detectors, Nuclear & Particles Physics, Other Physical Sciences, Full width at half maximum, chemistry, High pressure, Physical Sciences, Analysis and statistical methods, business, Energy (signal processing)
Abstract

One of the major goals of the NEXT-White (NEW) detector is to demonstrate the energy resolution that an electroluminescent high pressure xenon TPC can achieve for high energy tracks. For this purpose, energy calibrations with 137Cs and 232Th sources have been carried out as a part of the long run taken with the detector during most of 2017. This paper describes the initial results obtained with those calibrations, showing excellent linearity and an energy resolution that extrapolates to approximately 1% FWHM at Q$_{\beta\beta}$., Comment: 14 pages, 8 figures, Accepted for publication in JINST

Published
2018

9. Measurement of radon-induced backgrounds in the NEXT double beta decay experiment

Author

G. Martínez-Lema, Javier Pérez, R. Guenette, J.F. Toledo, F. Monrabal, M. Diesburg, S. Cárcel, P. Lebrun, J. Escada, A. Para, M. Sorel, A.L. Ferreira, A. Martínez, M. Nebot-Guinot, C.D.R. Azevedo, L. Labarga, F. Ballester, Paola Ferrario, M. Losada, Sandra K. Johnston, J.M. Benlloch-Rodríguez, N. López-March, J. Torrent, F.P. Santos, C. Romo-Luque, J.M.F. dos Santos, K. Bailey, S. Riordan, F.I.G.M. Borges, R.D.P. Mano, A.D. McDonald, D.R. Nygren, J.A. Hernando Morata, J.T. White, Vicente Herrero, A. Goldschmidt, J. Hauptman, A. Botas, A. Laing, J. Generowicz, F. Psihas, C. Sofka, J. Martíın-Albo, C.A.N. Conde, L. Ripoll, C. Adams, B. J. P. Jones, A. Simón, J.F.C.A. Veloso, E.D.C. Freitas, F.J. Mora, A.F.M. Fernandes, M. Musti, Víctor H. Alvarez, T.M. Stiegler, D. González-Díaz, J. S. Díaz, P. Novella, C.M.B. Monteiro, Lior Arazi, Roberto Gutiérrez, J.J. Gómez-Cadenas, Javier Rodríguez, L.M.P. Fernandes, C.A.O. Henriques, R. Felkai, K. Hafidi, Jose Repond, L. Rogers, J.V. Carrión, M. Querol, J. Muñoz Vidal, S. Cebrián, R. C. Webb, M. Kekic, N. Yahlali, Romain Esteve, B. Palmeiro, A.I. Hernandez, J. Renner, G. Zuzel, Universidade de Santiago de Compostela. Departamento de Física de Partículas, and Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Nuclear physics, FOS: Physical sciences, chemistry.chemical_element, Radon, Electron, 01 natural sciences, Atomic, Mathematical Sciences, High Energy Physics - Experiment, law.invention, Ion, High Energy Physics - Experiment (hep-ex), Xenon, Particle and Plasma Physics, law, Double beta decay, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Mathematical Physics, Physics, Quantum Physics, Time projection chamber, 010308 nuclear & particles physics, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Cathode, Doble desintegració beta, chemistry, Physical Sciences, lcsh:QC770-798, Física nuclear
Abstract

The measurement of the internal $^{222}$Rn activity in the NEXT-White detector during the so-called Run-II period with $^{136}$Xe-depleted xenon is discussed in detail, together with its implications for double beta decay searches in NEXT. The activity is measured through the alpha production rate induced in the fiducial volume by $^{222}$Rn and its alpha-emitting progeny. The specific activity is measured to be $(38.1\pm 2.2~\mathrm{(stat.)}\pm 5.9~\mathrm{(syst.)})$~mBq/m$^3$. Radon-induced electrons have also been characterized from the decay of the $^{214}$Bi daughter ions plating out on the cathode of the time projection chamber. From our studies, we conclude that radon-induced backgrounds are sufficiently low to enable a successful NEXT-100 physics program, as the projected rate contribution should not exceed 0.1~counts/yr in the neutrinoless double beta decay sample., Comment: 28 pages, 10 figures, 6 tables. Version accepted for publication in JHEP

Published
2018

10. Calibration of the NEXT-White detector using 83m Kr decays

Author

N. Yahlali, R. Felkai, C.D.R. Azevedo, Sandra K. Johnston, J. Renner, D. González-Díaz, Romain Esteve, A. Botas, C. Adams, A.F.M. Fernandes, J.T. White, J. Generowicz, M. Querol, S. Riordan, R. Guenette, J.F. Toledo, S. Cárcel, J. Torrent, Roberto Gutiérrez, P. Lebrun, A.D. McDonald, A. Martínez, C. Sofka, C.A.N. Conde, C.M.B. Monteiro, L.M.P. Fernandes, A. Simón, K. Bailey, A. Goldschmidt, J. Muñoz Vidal, J. Rodríguez, A. Para, J. Hauptman, Víctor H. Alvarez, C. Romo-Luque, M. Sorel, V. Herrero, F.P. Santos, A.L. Ferreira, B. Palmeiro, D.R. Nygren, M. Kekic, F.J. Mora, M. Diesburg, F. Monrabal, F.I.G.M. Borges, T.M. Stiegler, J. Escada, G. Martínez-Lema, J. Pérez, C.A.O. Henriques, J. V. Carrión, L. Rogers, S. Cebrián, R. C. Webb, J.M. Benlloch-Rodríguez, K. Hafidi, M. Nebot-Guinot, Jose Repond, F. Ballester, M. Musti, J. S. Díaz, P. Novella, J. Martín-Albo, J.J. Gómez-Cadenas, J.M.F. dos Santos, L. Ripoll, B. J. P. Jones, L. Labarga, M. Losada, N. López-March, R.D.P. Mano, J.A. Hernando Morata, J.F.C.A. Veloso, E.D.C. Freitas, A. Laing, Lior Arazi, Paola Ferrario, and A.I. Hernandez

Subjects
Physics, Time projection chamber, 010308 nuclear & particles physics, Krypton, Detector, Solid angle, chemistry.chemical_element, 01 natural sciences, Nuclear physics, Full width at half maximum, Xenon, chemistry, Double beta decay, 0103 physical sciences, Calibration, 010306 general physics, Instrumentation, Mathematical Physics
Abstract

The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. It has been operating at Laboratorio Subterr'aneo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed using 83mKr decays during a long run taken from March to November 2017 (Run II). Krypton calibrations are used to correct for the finite drift-electron lifetime as well as for the dependence of the measured energy on the event transverse position which is caused by variations in solid angle coverage both for direct and reflected light and edge effects. After producing calibration maps to correct for both effects we measure an excellent energy resolution for 41.5 keV point-like deposits of (4.553 ± 0.010 (stat) ± 0.324 (sys))% FWHM in the full chamber and (3.804 ± 0.013 (stat) ± 0.112 (sys))% FWHM in a restricted fiducial volume. Using naive 1/E scaling, these values translate into resolutions of (0.5916 ± 0.0014 (stat) ± 0.0421 (sys))% FWHM and (0.4943 ± 0.0017 (stat) ± 0.0146 (sys))% FWHM at the Qββ energy of xenon double beta decay (2458 keV), well within range of our target value of 1%.

Published
2018
Full Text
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11. Radiopurity assessment of the energy readout for the NEXT double beta decay experiment

Author

J. Martin-Albo, F. Monrabal, B. Palmeiro, D. González-Díaz, J. S. Díaz, P. Novella, L.M.P. Fernandes, J.J. Gómez-Cadenas, I. C. Bandac, C.A.O. Henriques, C.A.N. Conde, A. Simón, M. Musti, A. Botas, A.D. McDonald, J.F.C.A. Veloso, A. Goldschmidt, J. Hauptman, R. Felkai, E.D.C. Freitas, L.M. Moutinho, J. Torrent, N. Yahlali, A.I. Hernandez, J.M.F. dos Santos, S. Cebrián, F.I.G.M. Borges, M. Querol, Javier Pérez, A. Para, R. C. Webb, Romain Esteve, J. Muñoz Vidal, M. Sorel, A.L. Ferreira, Z. Tsamalaidze, A. Laing, F.J. Mora, T.M. Stiegler, M. Nebot-Guinot, D.R. Nygren, Roberto Gutiérrez, S. Cárcel, I. Liubarsky, P. Lebrun, p J. F. Toledo, A. Martínez, G. Martínez-Lema, J. Renner, C. Sofka, F.P. Santos, Paola Ferrario, o J. Rodríguez, M. Losada, J.M. Benlloch-Rodríguez, N. López-March, L. Rogers, Vicente Herrero, C.M.B. Monteiro, J.A. Hernando Morata, L. Ripoll, L. Labarga, B. J. P. Jones, M. Diesburg, J. Escada, J.T. White, C.D.R. Azevedo, José Villar, J.V. Carrión, and Víctor H. Alvarez

Subjects
Photomultiplier, Physics - Instrumentation and Detectors, Time projection chambers, chemistry.chemical_element, FOS: Physical sciences, Tracking (particle physics), 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, TECNOLOGIA ELECTRONICA, High Energy Physics - Experiment (hep-ex), Xenon, Double beta decay, 0103 physical sciences, Sensitivity (control systems), Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Mathematical Physics, Physics, 010308 nuclear & particles physics, Detector, Gamma detectors (scintillators, CZT, HPG, HgI etc), Instrumentation and Detectors (physics.ins-det), Double-beta decay detectors, chemistry, Search for radioactive and fissile materials, Neutrino, Energy (signal processing)
Abstract

[EN] The "Neutrino Experiment with a Xenon Time-Projection Chamber" (NEXT) experiment intends to investigate the neutrinoless double beta decay of 136Xe, and therefore requires a severe suppression of potential backgrounds. An extensive material screening and selection process was undertaken to quantify the radioactivity of the materials used in the experiment. Separate energy and tracking readout planes using different sensors allow us to combine the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. The design of radiopure readout planes, in direct contact with the gas detector medium, was especially challenging since the required components typically have activities too large for experiments demanding ultra-low background conditions. After studying the tracking plane, here the radiopurity control of the energy plane is presented, mainly based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterráneo de Canfranc (Spain). All the available units of the selected model of photomultiplier have been screened together with most of the components for the bases, enclosures and windows. According to these results for the activity of the relevant radioisotopes, the selected components of the energy plane would give a contribution to the overall background level in the region of interest of at most 2.4 × 10¿4 counts per keV, kg and year, satisfying the sensitivity requirements of the NEXT experiment., Special thanks are due to LSC directorate and staff for their strong support for performing the measurements at the LSC Radiopurity Service. We are really grateful to Grzegorz Zuzel for the radon emanation measurements. The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the Ministerio de Economia y Competitividad of Spain under grants FIS2014-53371-C04 and the Severo Ochoa Program SEV-2014-0398; the GVA of Spain under grant PROMETEO/2016/120; the Portuguese FCT and FEDER through the program COMPETE, project PTDC/FIS/103860/2008; the U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory) and DE-FG02-13ER42020 (Texas A & and the University of Texas at Arlington.

Published
2017

12. Microscopic simulation of xenon-based optical TPCs in the presence of molecular additives

Author

J. Muñoz Vidal, Roberto Gutiérrez, I. Liubarsky, L.M.P. Fernandes, N. Yahlali, J.V. Carrión, J.F.C.A. Veloso, E.D.C. Freitas, L. Ripoll, A. Para, M. Sorel, A.L. Ferreira, B. J. P. Jones, A. Goldschmidt, Romain Esteve, J. Martin-Albo, J. Hauptman, M. Nebot-Guinot, C.D.R. Azevedo, A.D. McDonald, S. Biagi, Javier Rodríguez, F. Monrabal, D. Shuman, L.M. Moutinho, Luis M. Serra, J. Torrent, Carlos R. Oliveira, B. Palmeiro, J Pérez, N. López-March, L. Rogers, C. Sofka, C.M.B. Monteiro, Diego González-Díaz, J.A. Hernando Morata, J.M. Benlloch-Rodríguez, C.A.O. Henriques, A.I. Hernandez, J.M.F. dos Santos, J.T. White, F.P. Santos, V. Herrero, J. S. Díaz, L. Labarga, S. Cebrián, R. Felkai, P. Novella, R. C. Webb, J.J. Gómez-Cadenas, J. Renner, F.I.G.M. Borges, F.J. Mora, Víctor H. Alvarez, T.M. Stiegler, J.F. Toledo, S. Cárcel, P. Lebrun, A. Martínez, A. Botas, M. Diesburg, J. Escada, A. Laing, Paola Ferrario, M. Losada, D.R. Nygren, G. Martínez-Lema, Z. Tsamalaidze, M. Querol, C.A.N. Conde, A. Simón, M. Musti, Uludağ Üniversitesi/Fen - Edebiyat Fakültesi/Fizik Bölümü., and Biagi, Stephen F.

Subjects
Xenon, Physics - Instrumentation and Detectors, Nuclear science & technology, Physics::Instrumentation and Detectors, Electron cooling, Electron, Microscopic simulation, Rate constans, 01 natural sciences, Optical TPCs, Molecular additives, Radiative transfer, Physics, nuclear, Detectors and Experimental Techniques, Instrumentation, physics.ins-det, Xenon scintillation, Scintillation, Detectors de radiació, Physics, Quenching, Range (particle radiation), Gaseous electronics, Instrumentation and Detectors (physics.ins-det), Nuclear physics -- Instruments, Cascade, Nuclear counters, Gas, Excited state, Collisional deactivation, Physics, particles & fields, Atomic physics, Instruments & instrumentation, Secondary scintillation yield, Electronic cooling, Nuclear and High Energy Physics, Atoms, Reaction rates, FOS: Physical sciences, chemistry.chemical_element, Física nuclear -- Instruments, Electrons, Molecular quenchers, Energy-transfer, TECNOLOGIA ELECTRONICA, Emission, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Resonance radiation, Argon, 010306 general physics, High-pressure xenon, 010308 nuclear & particles physics, Beta Decay, Molecules, High pressure, chemistry, Electroluminescence
Abstract

[EN] We introduce a simulation framework for the transport of high and low energy electrons in xenon-based optical time projection chambers (OTPCs). The simulation relies on elementary cross sections (electron-atom and electron-molecule) and incorporates, in order to compute the gas scintillation, the reaction/quenching rates (atom-atom and atom-molecule) of the first 41 excited states of xenon and the relevant associated excimers, together with their radiative cascade. The results compare positively with observations made in pure xenon and its mixtures with CO2 and CF4 in a range of pressures from 0.1 to 10 bar. This work sheds some light on the elementary processes responsible for the primary and secondary xenon-scintillation mechanisms in the presence of additives, that are of interest to the OTPC technology., DGD is supported by the Ramon y Cajal program (Spain) under contract number RYC-2015-18820. The authors want to acknowledge the RD51 collaboration for encouragement and support during the elaboration of this work, and in particular discussions with F. Resnati, A. Milov, V. Peskov, M. Suzuki and A. F. Borghesani. The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the Ministerio de Economia y Competitividad of Spain under grants FIS2014-53371-C04 and the Severo Ochoa Program SEV-2014-0398; the GVA of Spain under grant PROM-ETEO/2016/120; the Portuguese FCT and FEDER through the program COMPETE, project PTDC/FIS-NUC/2525/2014 and UID/FIS/04559/2013; the U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory) and DE-FG02-13ER42020 (Texas A& and the University of Texas at Arlington.

Published
2017

13. Secondary scintillation yield of xenon with sub-percent levels of CO2 additive for rare-event detection

Author

A. Goldschmidt, J. Hauptman, J.T. White, F.P. Santos, M. Querol, C.A.N. Conde, A. Simón, C.M.B. Monteiro, Diego González-Díaz, D.R. Nygren, M. Musti, J. S. Díaz, P. Novella, J. Martín-Albo, N. Yahlali, F.I.G.M. Borges, J.J. Gómez-Cadenas, Javier Rodríguez, C.A.O. Henriques, Romain Esteve, G. Martínez-Lema, A. Para, N. López-March, R. Felkai, L. Rogers, L. Ripoll, Javier Pérez, B. J. P. Jones, B. Palmeiro, M. R. Jorge, J.V. Carrión, A. Botas, F. Monrabal, M. Sorel, A.L. Ferreira, A.D. McDonald, V. Herrero, M. Nebot-Guinot, R.D.P. Mano, J. Muñoz Vidal, Roberto Gutiérrez, C.D.R. Azevedo, I. Liubarsky, L.M. Moutinho, J. Torrent, J.A. Hernando Morata, F.J. Mora, J.M.F. dos Santos, J.F. Toledo, T.M. Stiegler, S. Cárcel, J.F.C.A. Veloso, E.D.C. Freitas, P. Lebrun, A. Martínez, C. Sofka, A.I. Hernandez, J.M. Benlloch-Rodríguez, S. Cebrián, R. C. Webb, M. Diesburg, L. Labarga, Víctor H. Alvarez, A. Laing, M. Losada, J. Renner, Paola Ferrario, Z. Tsamalaidze, and L.M.P. Fernandes

Subjects
Nuclear and High Energy Physics, Fano factor, Ionization, Xenon, Ionització, Electron capture, Analytical chemistry, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Atomic, Particle detector, Nuclear physics, TECNOLOGIA ELECTRONICA, Secondary scintillation, Particle and Plasma Physics, 0103 physical sciences, Neutrino, Nuclear, 010306 general physics, Mathematical Physics, Physics, Scintillation, 010308 nuclear & particles physics, Rare event detection, Molecular, Double beta decay, Nuclear & Particles Physics, lcsh:QC1-999, chemistry, Electroluminescence, Yield (chemistry), Radioactive decay, Astronomical and Space Sciences, lcsh:Physics
Abstract

[EN] Xe-CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications in the important field of rare event detection such as directional dark matter, double electron capture and double beta decay detection. The addition of CO2 to pure xenon at the level of 0.05-0.1% can reduce significantly the scale of electron diffusion from 10 mm/root m to 2.5 mm/root m, with high impact on the discrimination of the events through pattern recognition of the topology of primary ionization trails. We have measured the electroluminescence (EL) yield of Xe-CO2 mixtures, with sub-percent CO2 concentrations. We demonstrate that the EL production is still high in these mixtures, 70% and 35% relative to that produced in pure xenon, for CO2 concentrations around 0.05% and 0.1%, respectively. The contribution of the statistical fluctuations in EL production to the energy resolution increases with increasing CO2 concentration, being smaller than the contribution of the Fano factor for concentrations below 0.1% CO2. (C) 2017 The Author. Published by Elsevier B.V., The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the Ministerio de Economia y Competitividad of Spain under grants FIS2014-53371-C04 and the Severo Ochoa Program SEV-2014-0398; the GVA of Spain under grant PROMETEO/2016/120; the Portuguese FCT under project PTDC/FIS-NUC/2525/2014; the U.S. Department of Energy under contracts number DE-AC02-07CH11359 (Fermi National Accelerator Laboratory) and DE-FG02-13ER42020 (Texas A & the University of Texas at Arlington. C.A.O.H., E.D.C.F., C.M.B.M. and C.D.R.A. acknowledge FCT under grants PD/BD/105921/2014, SFRH/BPD/109180/2015, SFRH/BPD/76842/2011 and SFRH/BPD/79163/2011, respectively.

Published
2017

14. Differential cross section for w boson production as a function of transverse momentum in p p̄ collisions at √s = 1.8 TeV

Author

V.M Abazov, B Abbott, A Abdesselam, M Abolins, V Abramov, B.S Acharya, D.L Adams, M Adams, S.N Ahmed, G.D Alexeev, G.A Alves, N Amos, E.W Anderson, M.M Baarmand, V.V Babintsev, L Babukhadia, T.C Bacon, A Baden, B Baldin, P.W Balm, S Banerjee, E Barberis, P Baringer, J Barreto, J.F Bartlett, U Bassler, D Bauer, A Bean, M Begel, A Belyaev, S.B Beri, G Bernardi, I Bertram, A Besson, R Beuselinck, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, N.I Bojko, F Borcherding, K Bos, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, M Buehler, V Buescher, V.S Burtovoi, J.M Butler, F Canelli, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, K.M Chan, S.V Chekulaev, D.K Cho, S Choi, S Chopra, J.H Christenson, M Chung, D Claes, A.R Clark, J Cochran, L Coney, B Connolly, W.E Cooper, D Coppage, M.A.C Cummings, D Cutts, G.A Davis, K Davis, K De, S.J de Jong, K Del Signore, M Demarteau, R Demina, P Demine, D Denisov, S.P Denisov, S Desai, H.T Diehl, M Diesburg, G Di Loreto, S Doulas, P Draper, Y Ducros, L.V Dudko, S Duensing, L Duflot, S.R Dugad, A Dyshkant, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, J Estrada, H Evans, V.N Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, F Filthaut, H.E Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, K.C Frame, S Fuess, E Gallas, A.N Galyaev, M Gao, V Gavrilov, R.J Genik II, K Genser, C.E Gerber, Y Gershtein, R Gilmartin, G Ginther, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, G Graham, P.D Grannis, J.A Green, H Greenlee, S Grinstein, L Groer, S Grünendahl, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, C Hays, C Hebert, D Hedin, A.P Heinson, U Heintz, T Heuring, M.D Hildreth, R Hirosky, J.D Hobbs, B Hoeneisen, Y Huang, R Illingworth, A.S Ito, M Jaffré, S Jain, R Jesik, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, A Juste, S Kahn, E Kajfasz, A.M Kalinin, D Karmanov, D Karmgard, R Kehoe, A Kharchilava, S.K Kim, B Klima, B Knuteson, W Ko, J.M Kohli, A.V Kostritskiy, J Kotcher, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, P Krivkova, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, A Kupco, V.E Kuznetsov, G Landsberg, A Leflat, C Leggett, F Lehner, J Li, Q.Z Li, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, A Lucotte, L Lueking, C Lundstedt, C Luo, A.K.A Maciel, R.J Madaras, V.L Malyshev, V Manankov, H.S Mao, T Marshall, M.I Martin, R.D Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, J McDonald, T McMahon, H.L Melanson, M Merkin, K.W Merritt, C Miao, H Miettinen, D Mihalcea, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, R.W Moore, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, V.S Narasimham, H.A Neal, J.P Negret, S Negroni, T Nunnemann, D O'Neil, V Oguri, B Olivier, N Oshima, P Padley, L.J Pan, K Papageorgiou, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, M Peters, O Peters, P Pétroff, R Piegaia, H Piekarz, B.G Pope, E Popkov, H.B Prosper, S Protopopescu, J Qian, R Raja, S Rajagopalan, E Ramberg, P.A Rapidis, N.W Reay, S Reucroft, J Rha, M Ridel, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, B.M Sabirov, A Santoro, L Sawyer, R.D Schamberger, H Schellman, A Schwartzman, N Sen, E Shabalina, R.K Shivpuri, D Shpakov, M Shupe, R.A Sidwell, V Simak, H Singh, J.B Singh, V Sirotenko, P Slattery, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, V Sorı́n, M Sosebee, N Sotnikova, K Soustruznik, M Souza, N.R Stanton, G Steinbrück, R.W Stephens, F Stichelbaut, D Stoker, V Stolin, D.A Stoyanova, M Strauss, M Strovink, L Stutte, A Sznajder, W Taylor, S Tentindo-Repond, S.M Tripathi, T.G Trippe, A.S Turcot, P.M Tuts, P van Gemmeren, V Vaniev, R Van Kooten, N Varelas, L.S Vertogradov, A.A Volkov, A.P Vorobiev, H.D Wahl, H Wang, Z.-M Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, D Whiteson, J.A Wightman, D.A Wijngaarden, S Willis, S.J Wimpenny, J Womersley, D.R Wood, R Yamada, P Yamin, T Yasuda, Y.A Yatsunenko, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, H Zheng, Z Zhou, M Zielinski, D Zieminska, A Zieminski, V Zutshi, E.G Zverev, and A Zylberstejn

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Proton, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Tevatron, D0 experiment, 7. Clean energy, 01 natural sciences, law.invention, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, 010306 general physics, Collider
Abstract

We report a measurement of the differential cross section for W boson production as a function of its transverse momentum in proton-antiproton collisions at √s = 1.8 TeV. The data were collected by the DØ experiment at the Fermilab Tevatron Collider during 1994-1995 and correspond to an integrated luminosity of 85 pb-1. The results are in good agreement with quantum chromodynamics over the entire range of transverse momentum. © 2001 Elsevier Science B.V.

Published
2016

15. Probing hard color-singlet exchange in pp̄ collisions at √s = 630 GeV and 1800 GeV

Author

B Abbott, M Abolins, V Abramov, B.S Acharya, I Adam, D.L Adams, M Adams, S Ahn, H Aihara, G.A Alves, N Amos, E.W Anderson, R Astur, M.M Baarmand, V.V Babintsev, L Babukhadia, A Baden, B Baldin, S Banerjee, J Bantly, E Barberis, P Baringer, J.F Bartlett, A Belyaev, S.B Beri, I Bertram, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, N.I Bojko, F Borcherding, C Boswell, A Brandt, R Breedon, R Brock, A Bross, D Buchholz, V.S Burtovoi, J.M Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, S.-M Chang, S.V Chekulaev, W Chen, S Choi, S Chopra, B.C Choudhary, J.H Christenson, M Chung, D Claes, A.R Clark, W.G Cobau, J Cochran, L Coney, W.E Cooper, C Cretsinger, D Cullen-Vidal, M.A.C Cummings, D Cutts, O.I Dahl, K Davis, K De, K Del Signore, M Demarteau, D Denisov, S.P Denisov, H.T Diehl, M Diesburg, G Di Loreto, P Draper, Y Ducros, L.V Dudko, S.R Dugad, A Dyshkant, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, V.N Evdokimov, T Fahland, M.K Fatyga, S Feher, D Fein, T Ferbel, G Finocchiaro, H.E Fisk, Y Fisyak, E Flattum, G.E Forden, M Fortner, K.C Frame, S Fuess, E Gallas, A.N Galyaev, P Gartung, V Gavrilov, T.L Geld, R.J Genik II, K Genser, C.E Gerber, Y Gershtein, B Gibbard, B Gobbi, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, P.D Grannis, D.R Green, H Greenlee, S Grinstein, P Grudberg, S Grünendahl, G Guglielmo, J.A Guida, J.M Guida, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, K.S Hahn, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, D Hedin, A.P Heinson, U Heintz, R Hernández-Montoya, T Heuring, R Hirosky, J.D Hobbs, B Hoeneisen, J.S Hoftun, F Hsieh, Ting Hu, Tong Hu, A.S Ito, E James, J Jaques, S.A Jerger, R Jesik, T Joffe-Minor, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, S.Y Jun, C.K Jung, S Kahn, G Kalbfleisch, D Karmanov, D Karmgard, R Kehoe, M.L Kelly, S.K Kim, B Klima, C Klopfenstein, W Ko, J.M Kohli, D Koltick, A.V Kostritskiy, J Kotcher, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, S Krzywdzinski, S Kuleshov, Y Kulik, S Kunori, F Landry, G Landsberg, B Lauer, A Leflat, J Li, Q.Z Li-Demarteau, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, F Lobkowicz, S.C Loken, A Lucotte, L Lueking, A.L Lyon, A.K.A Maciel, R.J Madaras, R Madden, L Magaña-Mendoza, V Manankov, S Mani, H.S Mao, R Markeloff, T Marshall, M.I Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, J McDonald, T McKibben, J McKinley, T McMahon, H.L Melanson, M Merkin, K.W Merritt, C Miao, H Miettinen, A Mincer, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, P Mooney, M Mostafa, H da Motta, C Murphy, F Nang, M Narain, V.S Narasimham, A Narayanan, H.A Neal, J.P Negret, P Nemethy, D Norman, L Oesch, V Oguri, E Oliveira, E Oltman, N Oshima, D Owen, P Padley, A Para, Y.M Park, R Partridge, N Parua, M Paterno, B Pawlik, J Perkins, M Peters, R Piegaia, H Piekarz, Y Pischalnikov, B.G Pope, H.B Prosper, S Protopopescu, J Qian, P.Z Quintas, R Raja, S Rajagopalan, O Ramirez, S Reucroft, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, A Sánchez-Hernández, A Santoro, L Sawyer, R.D Schamberger, H Schellman, J Sculli, E Shabalina, C Shaffer, H.C Shankar, R.K Shivpuri, D Shpakov, M Shupe, H Singh, J.B Singh, V Sirotenko, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, M Sosebee, N Sotnikova, M Souza, G Steinbrück, R.W Stephens, M.L Stevenson, D Stewart, F Stichelbaut, D Stoker, V Stolin, D.A Stoyanova, M Strauss, K Streets, M Strovink, A Sznajder, P Tamburello, J Tarazi, M Tartaglia, T.L.T Thomas, J Thompson, T.G Trippe, P.M Tuts, V Vaniev, N Varelas, E.W Varnes, D Vititoe, A.A Volkov, A.P Vorobiev, H.D Wahl, G Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, J.A Wightman, S Willis, S.J Wimpenny, J.V.D Wirjawan, J Womersley, E Won, D.R Wood, Z Wu, R Yamada, P Yamin, T Yasuda, P Yepes, K Yip, C Yoshikawa, S Youssef, J Yu, Y Yu, B Zhang, Y Zhou, Z Zhou, Z.H Zhu, M Zielinski, D Zieminska, A Zieminski, E.G Zverev, and A Zylberstejn

Subjects
Physics, Nuclear and High Energy Physics, Transverse plane, Particle physics, Pseudorapidity, High Energy Physics::Phenomenology, Detector, High Energy Physics::Experiment, Singlet state, Jet (particle physics), Nuclear Experiment
Abstract

We present results on dijet production via hard color-singlet exchange in proton-antiproton collisions at √s = 630 GeV and 1800 GeV using the DØ detector. The fraction of dijet events produced via color-singlet exchange is measured as a function of jet transverse energy, separation in pseudorapidity between the two highest transverse energy jets, and proton-antiproton center-of-mass energy. The results are consistent with a color-singlet fraction that increases with an increasing fraction of quark-initiated processes and inconsistent with two-gluon models for the hard color-singlet. © 1998 Published by Elsevier Science B.V. All rights reserved.

Published
2016

16. Determination of the absolute jet energy scale in the DO calorimeters

Author

B Abbott, M Abolins, B.S Acharya, I Adam, D.L Adams, M Adams, S Ahn, H Aihara, G.A Alves, N Amos, E.W Anderson, R Astur, M.M Baarmand, L Babukhadia, A Baden, V Balamurali, J Balderston, B Baldin, S Banerjee, J Bantly, E Barberis, J.F Bartlett, A Belyaev, S.B Beri, I Bertram, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, N.I Bojko, F Borcherding, C Boswell, A Brandt, R Brock, A Bross, D Buchholz, V.S Burtovoi, J.M Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, S.-M Chang, S.V Chekulaev, L.-P Chen, W Chen, S Choi, S Chopra, B.C Choudhary, J.H Christenson, M Chung, D Claes, A.R Clark, W.G Cobau, J Cochran, L Coney, W.E Cooper, C Cretsinger, D Cullen-Vidal, M.A.C Cummings, D Cutts, O.I Dahl, K Davis, K De, K.Del Signore, M Demarteau, D Denisov, S.P Denisov, H.T Diehl, M Diesburg, G.Di Loreto, P Draper, Y Ducros, L.V Dudko, S.R Dugad, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, V.N Evdokimov, T Fahland, M.K Fatyga, S Feher, D Fein, T Ferbel, G Finocchiaro, H.E Fisk, Y Fisyak, E Flattum, G.E Forden, M Fortner, K.C Frame, S Fuess, E Gallas, A.N Galyaev, P Gartung, V Gavrilov, T.L Geld, R.J.Genik II, K Genser, C.E Gerber, Y Gershtein, B Gibbard, S Glenn, B Gobbi, A Goldschmidt, B Gómez, G Gómez, P.I Goncharov, J.L GonzálezSolı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, P.D Grannis, D.R Green, H Greenlee, S Grinstein, P Grudberg, S Grünendahl, G Guglielmo, J.A Guida, J.M Guida, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, K.S Hahn, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, D Hedin, A.P Heinson, U Heintz, R Hernández-Montoya, T Heuring, R Hirosky, J.D Hobbs, B Hoeneisen, J.S Hoftun, F Hsieh, Ting Hu, Tong Hu, T Huehn, A.S Ito, E James, J Jaques, S.A Jerger, R Jesik, J.Z.-Y Jiang, T Joffe-Minor, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, S.Y Jun, C.K Jung, S Kahn, G Kalbfleisch, J.S Kang, D Karmanov, D Karmgard, R Kehoe, M.L Kelly, C.L Kim, S.K Kim, B Klima, C Klopfenstein, J.M Kohli, D Koltick, A.V Kostritskiy, J Kotcher, A.V Kotwal, J Kourlas, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, S Krzywdzinski, S Kuleshov, S Kunori, F Landry, G Landsberg, B Lauer, A Leflat, H Li, J Li, Q.Z Li-Demarteau, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, Y.C Liu, F Lobkowicz, S.C Loken, S Lökös, L Lueking, A.L Lyon, A.K.A Maciel, R.J Madaras, R Madden, L Magaña-Mendoza, V Manankov, S Mani, H.S Mao, R Markeloff, T Marshall, M.I Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, J McDonald, T McKibben, J McKinley, T McMahon, H.L Melanson, M Merkin, K.W Merritt, H Miettinen, A Mincer, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, P Mooney, H da Motta, C Murphy, F Nang, M Narain, V.S Narasimham, A Narayanan, H.A Neal, J.P Negret, P Nemethy, D Norman, L Oesch, V Oguri, E Oliveira, E Oltman, N Oshima, D Owen, P Padley, A Para, Y.M Park, R Partridge, N Parua, M Paterno, B Pawlik, J Perkins, M Peters, R Piegaia, H Piekarz, Y Pischalnikov, B.G Pope, H.B Prosper, S Protopopescu, J Qian, P.Z Quintas, R Raja, S Rajagopalan, O Ramirez, L Rasmussen, S Reucroft, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, A Sánchez-Hernández, A Santoro, L Sawyer, R.D Schamberger, H Schellman, J Sculli, E Shabalina, C Shaffer, H.C Shankar, R.K Shivpuri, M Shupe, H Singh, J.B Singh, V Sirotenko, W Smart, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, M Sosebee, N Sotnikova, M Souza, A.L Spadafora, G Steinbrück, R.W Stephens, M.L Stevenson, D Stewart, F Stichelbaut, D Stoker, V Stolin, D.A Stoyanova, M Strauss, K Streets, M Strovink, A Sznajder, P Tamburello, J Tarazi, M Tartaglia, T.L.T Thomas, J Thompson, T.G Trippe, P.M Tuts, N Varelas, E.W Varnes, D Vititoe, A.A Volkov, A.P Vorobiev, H.D Wahl, G Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, J.A Wightman, S Willis, S.J Wimpenny, J.V.D Wirjawan, J Womersley, E Won, D.R Wood, H Xu, R Yamada, P Yamin, J Yang, T Yasuda, P Yepes, C Yoshikawa, S Youssef, J Yu, Y Yu, Z Zhou, Z.H Zhu, D Zieminska, A Zieminski, E.G Zverev, and A Zylberstejn

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Physics::Instrumentation and Detectors, Detector, Tevatron, FOS: Physical sciences, Jet (particle physics), High Energy Physics - Experiment, Calorimeter, High Energy Physics - Experiment (hep-ex), Pseudorapidity, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Instrumentation
Abstract

The DZERO detector is used to study proton-antiproton collisions at the 1800 GeV and 630 GeV center-of-mass energies available at the Fermilab Tevatron. To measure jets, the detector uses a sampling calorimeter composed of uranium and liquid argon as the passive and active media respectively. Understanding the jet energy calibration is not only crucial for precision tests of QCD, but also for the measurement of particle masses and the determination of physics backgrounds associated with new phenomena. This paper describes the energy calibration of jets observed with the DZERO detector at the two proton-antiproton center-of-mass energies in the transverse energy and pseudorapidity range ET>8 GeV and pseudorapidity, 94 pages with 52 figures (included in the 94 pages)

Published
2016

17. SIGN – A Gaseous-Neon-Based Underground Physics Detector

Author

G. Salinas, J.T. White, J. Gao, and H. Wang

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Physics::Instrumentation and Detectors, Scattering, Solar neutrino, Dark matter, Detector, chemistry.chemical_element, Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear physics, Neon, chemistry, Ionization, Astrophysics::Solar and Stellar Astrophysics, Physics::Atomic Physics, Neutrino
Abstract

Recent progress on the development of a room-temperature, nuclear-recoil-discriminating detector based on Scintillation and Ionization in Gaseous Neon (SIGN) will be discussed. Preliminary studies show that pure neon and neon + X mixtures (X = Ar, Xe, CH4 etc.) at pressure of > = 100 atmospheres can be used to detect radiation at low energies with excellent resolution in the range useful for a dark matter search. This also allows for the detection of coherent neutrino-nucleus scattering for neutrino energies greater than ∼ 10 MeV , thus making a large mass detector sensitive to supernovae and high energy solar neutrinos.

Published
2007

18. Status of the ZEPLIN II experiment

Author

J.V. Dawson, A. Bewick, Daniel Tovey, M. Atac, J. J. Quenby, R. Luscher, A.S. Murphy, T. Ferbel, J. Toke, V. Lebedenko, J.E. McMillan, N. J. T. Smith, E. J. Daw, V. A. Kudryavtsev, I. Liubarsky, S.M. Paling, B. Morgan, J.D. Lewin, Yi Chen, T. J. Sumner, J. Davis, M. J. Carson, W. Skulski, F. Wolfs, N. J. C. Spooner, D.B. Cline, M.K. Joshi, R.M. Preece, A.S. Howard, X. Yang, U. Schroeder, T.J. Durkin, Haiyan Wang, D. Davidge, T. B. Lawson, P.F. Smith, F. Sergiampietri, M. Robinson, P. K. Lightfoot, P. Smith, T. Gamble, B. Camanzi, C. Ghag, C. Bungau, J. Gao, W. G. Jones, J.T. White, R. Walker, and G.J. Alner

Subjects
Nuclear physics, Physics, Cold dark matter, WIMP, Space and Planetary Science, Dark matter, Detector, Astronomy, Astronomy and Astrophysics, Astrophysics
Abstract

ZEPLIN II is a 30-kg two-phase xenon detector designed for direct detection of cold dark matter in the form of WIMPs. Currently in the commissioning phase, it will begin operation in the Boulby Mine, UK later this year. ZEPLIN II is capable of discriminating between nuclear recoils and background events and has a design reach up to two orders of magnitude beyond current limits. It will also serve as a step in the development program for a next-generation ton-scale detector.

Published
2005

19. ZEPLIN IV: A future large-scale liquid xenon dark matter detector

Author

U. Schroeder, W. Skulski, Hui Wang, Y. Chen, J. Gao, F. Sergiampietri, X. Yang, T. Ferbel, M. Atac, J.T. White, David B. Cline, P.F. Smith, Jan Toke, and F. L. H. Wolfs

Subjects
Physics, Large Underground Xenon experiment, Physics::Instrumentation and Detectors, Dark matter, Detector, chemistry.chemical_element, Astronomy and Astrophysics, Supersymmetry, Electron, Photocathode, Nuclear physics, Xenon, chemistry, Space and Planetary Science, Luminescence
Abstract

We present a possible design of future large-scale dark matter detector using liquid xenon. A low energy threshold is achieved by using a large CsI-coated internal photocathode for primary light collection. A focusing field, in the active volume and an electron focusing structure at the liquid surface, are used to transport free-electrons to the luminescence field. A 3D reconstruction of the events can be achieved by timing and location of the luminescent signal. A liquid xenon Compton veto and self-shield are integrated in the compact design. This detector could be used to probe most of the SUSY predicted dark matter. ZEPLIN IV can be initially tested at Boulby and then be moved to the USA to operate at a US deep underground science and engineering laboratory.

Published
2005

20. The inclusive jet cross section in p collisions at =1.8 TeV using the k⊥ algorithm

Author

V.M Abazov, B Abbott, A Abdesselam, M Abolins, V Abramov, B.S Acharya, D.L Adams, M Adams, S.N Ahmed, G.D Alexeev, A Alton, G.A Alves, N Amos, E.W Anderson, Y Arnoud, C Avila, M.M Baarmand, V.V Babintsev, L Babukhadia, T.C Bacon, A Baden, B Baldin, P.W Balm, S Banerjee, E Barberis, P Baringer, J Barreto, J.F Bartlett, U Bassler, D Bauer, A Bean, F Beaudette, M Begel, A Belyaev, S.B Beri, G Bernardi, I Bertram, A Besson, R Beuselinck, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, F Blekman, S Blessing, A Boehnlein, N.I Bojko, F Borcherding, K Bos, T Bose, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, M Buehler, V Buescher, V.S Burtovoi, J.M Butler, F Canelli, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, K.M Chan, S.V Chekulaev, D.K Cho, S Choi, S Chopra, J.H Christenson, M Chung, D Claes, A.R Clark, L Coney, B Connolly, W.E Cooper, D Coppage, S Crépé-Renaudin, M.A.C Cummings, D Cutts, G.A Davis, K Davis, K De, S.J de Jong, K Del Signore, M Demarteau, R Demina, P Demine, D Denisov, S.P Denisov, S Desai, H.T Diehl, M Diesburg, S Doulas, Y Ducros, L.V Dudko, S Duensing, L Duflot, S.R Dugad, A Duperrin, A Dyshkant, D Edmunds, J Ellison, J.T Eltzroth, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, J Estrada, H Evans, V.N Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, F Filthaut, H.E Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, H Fox, K.C Frame, S Fu, S Fuess, E Gallas, A.N Galyaev, M Gao, V Gavrilov, R.J Genik, K Genser, C.E Gerber, Y Gershtein, R Gilmartin, G Ginther, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, G Graham, P.D Grannis, J.A Green, H Greenlee, Z.D Greenwood, S Grinstein, L Groer, S Grünendahl, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, C Hays, C Hebert, D Hedin, J.M Heinmiller, A.P Heinson, U Heintz, M.D Hildreth, R Hirosky, J.D Hobbs, B Hoeneisen, Y Huang, I Iashvili, R Illingworth, A.S Ito, M Jaffré, S Jain, R Jesik, K Johns, M Johnson, A Jonckheere, H Jöstlein, A Juste, W Kahl, S Kahn, E Kajfasz, A.M Kalinin, D Karmanov, D Karmgard, R Kehoe, A Khanov, A Kharchilava, S.K Kim, B Klima, B Knuteson, W Ko, J.M Kohli, A.V Kostritskiy, J Kotcher, B Kothari, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, P Krivkova, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, A Kupco, V.E Kuznetsov, G Landsberg, W.M Lee, A Leflat, C Leggett, F Lehner, C Leonidopoulos, J Li, Q.Z Li, X Li, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, A Lucotte, L Lueking, C Lundstedt, C Luo, A.K.A Maciel, R.J Madaras, V.L Malyshev, V Manankov, H.S Mao, T Marshall, M.I Martin, K.M Mauritz, A.A Mayorov, R McCarthy, T McMahon, H.L Melanson, M Merkin, K.W Merritt, C Miao, H Miettinen, D Mihalcea, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, R.W Moore, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, V.S Narasimham, N.A Naumann, H.A Neal, J.P Negret, S Negroni, T Nunnemann, D O'Neil, V Oguri, B Olivier, N Oshima, P Padley, L.J Pan, K Papageorgiou, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, O Peters, P Pétroff, R Piegaia, B.G Pope, E Popkov, H.B Prosper, S Protopopescu, M.B Przybycien, J Qian, R Raja, S Rajagopalan, E Ramberg, P.A Rapidis, N.W Reay, S Reucroft, M Ridel, M Rijssenbeek, F Rizatdinova, T Rockwell, M Roco, C Royon, P Rubinov, R Ruchti, J Rutherfoord, B.M Sabirov, G Sajot, A Santoro, L Sawyer, R.D Schamberger, H Schellman, A Schwartzman, N Sen, E Shabalina, R.K Shivpuri, D Shpakov, M Shupe, R.A Sidwell, V Simak, H Singh, J.B Singh, V Sirotenko, P Slattery, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, Y Song, V Sorı́n, M Sosebee, N Sotnikova, K Soustruznik, M Souza, N.R Stanton, G Steinbrück, R.W Stephens, F Stichelbaut, D Stoker, V Stolin, A Stone, D.A Stoyanova, M.A Strang, M Strauss, M Strovink, L Stutte, A Sznajder, M Talby, W Taylor, S Tentindo-Repond, S.M Tripathi, T.G Trippe, A.S Turcot, P.M Tuts, V Vaniev, R Van Kooten, N Varelas, L.S Vertogradov, F Villeneuve-Seguier, A.A Volkov, A.P Vorobiev, H.D Wahl, H Wang, Z.-M Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, D Whiteson, D.A Wijngaarden, S Willis, S.J Wimpenny, J Womersley, D.R Wood, Q Xu, R Yamada, P Yamin, T Yasuda, Y.A Yatsunenko, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, X Zhang, H Zheng, B Zhou, Z Zhou, M Zielinski, D Zieminska, A Zieminski, V Zutshi, E.G Zverev, and A Zylberstejn

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Tevatron, Jet (particle physics), 7. Clean energy, 01 natural sciences, law.invention, Cross section (physics), law, Pseudorapidity, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Fermilab, 010306 general physics, Collider, Algorithm
Abstract

The central inclusive jet cross section has been measured using a successive-combination algorithm for reconstruction of jets. The measurement uses 87.3 pb^{-1} of data collected with the D0 detector at the Fermilab Tevatron ppbar Collider during 1994-1995. The cross section, reported as a function of transverse momentum (pT>60 GeV) in the central region of pseudorapidity (|\eta

Published
2002

21. Measurement of the ratio of differential cross sections for W and Z boson production as a function of transverse momentum in p collisions at =1.8 TeV

Author

V.M Abazov, B Abbott, A Abdesselam, M Abolins, V Abramov, B.S Acharya, D.L Adams, M Adams, S.N Ahmed, G.D Alexeev, G.A Alves, N Amos, E.W Anderson, Y Arnoud, M.M Baarmand, V.V Babintsev, L Babukhadia, T.C Bacon, A Baden, B Baldin, P.W Balm, S Banerjee, E Barberis, P Baringer, J Barreto, J.F Bartlett, U Bassler, D Bauer, A Bean, F Beaudette, M Begel, A Belyaev, S.B Beri, G Bernardi, I Bertram, A Besson, R Beuselinck, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, N.I Bojko, F Borcherding, K Bos, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, M Buehler, V Buescher, V.S Burtovoi, J.M Butler, F Canelli, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, K.M Chan, S.V Chekulaev, D.K Cho, S Choi, S Chopra, J.H Christenson, M Chung, D Claes, A.R Clark, J Cochran, L Coney, B Connolly, W.E Cooper, D Coppage, S Crépé-Renaudin, M.A.C Cummings, D Cutts, G.A Davis, K Davis, K De, S.J de Jong, K Del Signore, M Demarteau, R Demina, P Demine, D Denisov, S.P Denisov, S Desai, H.T Diehl, M Diesburg, S Doulas, Y Ducros, L.V Dudko, S Duensing, L Duflot, S.R Dugad, A Duperrin, A Dyshkant, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, J Estrada, H Evans, V.N Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, F Filthaut, H.E Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, H Fox, K.C Frame, S Fu, S Fuess, E Gallas, A.N Galyaev, M Gao, V Gavrilov, R.J Genik, K Genser, C.E Gerber, Y Gershtein, R Gilmartin, G Ginther, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, G Graham, P.D Grannis, J.A Green, H Greenlee, Z.D Greenwood, S Grinstein, L Groer, S Grünendahl, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, C Hays, C Hebert, D Hedin, J.M Heinmiller, A.P Heinson, U Heintz, T Heuring, M.D Hildreth, R Hirosky, J.D Hobbs, B Hoeneisen, Y Huang, R Illingworth, A.S Ito, M Jaffré, S Jain, R Jesik, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, A Juste, W Kahl, S Kahn, E Kajfasz, A.M Kalinin, D Karmanov, D Karmgard, Z Ke, R Kehoe, A Khanov, A Kharchilava, S.K Kim, B Klima, B Knuteson, W Ko, J.M Kohli, A.V Kostritskiy, J Kotcher, B Kothari, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, P Krivkova, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, A Kupco, V.E Kuznetsov, G Landsberg, W.M Lee, A Leflat, C Leggett, F Lehner, J Li, Q.Z Li, X Li, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, A Lucotte, L Lueking, C Lundstedt, C Luo, A.K.A Maciel, R.J Madaras, V.L Malyshev, V Manankov, H.S Mao, T Marshall, M.I Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, T McMahon, H.L Melanson, M Merkin, K.W Merritt, C Miao, H Miettinen, D Mihalcea, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, R.W Moore, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, V.S Narasimham, H.A Neal, J.P Negret, S Negroni, T Nunnemann, D O'Neil, V Oguri, B Olivier, N Oshima, P Padley, L.J Pan, K Papageorgiou, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, M Peters, O Peters, P Pétroff, R Piegaia, B.G Pope, E Popkov, H.B Prosper, S Protopopescu, J Qian, R Raja, S Rajagopalan, E Ramberg, P.A Rapidis, N.W Reay, S Reucroft, M Ridel, M Rijssenbeek, F Rizatdinova, T Rockwell, M Roco, C Royon, P Rubinov, R Ruchti, J Rutherfoord, B.M Sabirov, G Sajot, A Santoro, L Sawyer, R.D Schamberger, H Schellman, A Schwartzman, N Sen, E Shabalina, R.K Shivpuri, D Shpakov, M Shupe, R.A Sidwell, V Simak, H Singh, J.B Singh, V Sirotenko, P Slattery, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, V Sorı́n, M Sosebee, N Sotnikova, K Soustruznik, M Souza, N.R Stanton, G Steinbrück, R.W Stephens, F Stichelbaut, D Stoker, V Stolin, A Stone, D.A Stoyanova, M Strauss, M Strovink, L Stutte, A Sznajder, M Talby, W Taylor, S Tentindo-Repond, S.M Tripathi, T.G Trippe, A.S Turcot, P.M Tuts, V Vaniev, R Van Kooten, N Varelas, L.S Vertogradov, F Villeneuve-Seguier, A.A Volkov, A.P Vorobiev, H.D Wahl, H Wang, Z.-M Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, D Whiteson, J.A Wightman, D.A Wijngaarden, S Willis, S.J Wimpenny, J Womersley, D.R Wood, Q Xu, R Yamada, P Yamin, T Yasuda, Y.A Yatsunenko, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, X Zhang, H Zheng, B Zhou, Z Zhou, M Zielinski, D Zieminska, A Zieminski, V Zutshi, E.G Zverev, A Zylberstejn, Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), D0, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, FOS: Physical sciences, Perturbative QCD, Observable, Function (mathematics), 16. Peace & justice, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Differential (mathematics)
Abstract

We report on a measurement of the ratio of the differential cross sections for W and Z boson production as a function of transverse momentum in proton-antiproton collisions at sqrt(s) = 1.8 TeV. This measurement uses data recorded by the D0 detector at the Fermilab Tevatron in 1994-1995. It represents the first investigation of a proposal that ratios between W and Z observables can be calculated reliably using perturbative QCD, even when the individual observables are not. Using the ratio of differential cross sections reduces both experimental and theoretical uncertainties, and can therefore provide smaller overall uncertainties in the measured mass and width of the W boson than current methods used at hadron colliders., Comment: 10 pages, 2 figures, to be published in Physics Letters B

Published
2001

22. The b production cross section and angular correlations in p collisions at =

Author

B Abbott, M Abolins, V Abramov, B.S Acharya, D.L Adams, M Adams, V Akimov, G.A Alves, N Amos, E.W Anderson, M.M Baarmand, V.V Babintsev, L Babukhadia, A Baden, B Baldin, S Banerjee, J Bantly, E Barberis, P Baringer, J.F Bartlett, U Bassler, A Bean, A Belyaev, S.B Beri, G Bernardi, I Bertram, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, N.I Bojko, F Borcherding, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, M Buehler, V Buescher, V.S Burtovoi, J.M Butler, F Canelli, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, K.M Chan, S.V Chekulaev, D.K Cho, S Choi, S Chopra, B.C Choudhary, J.H Christenson, M Chung, D Claes, A.R Clark, J Cochran, L Coney, B Connolly, W.E Cooper, D Coppage, D Cullen-Vidal, M.A.C Cummings, D Cutts, O.I Dahl, K Davis, K De, K Del Signore, M Demarteau, D Denisov, S.P Denisov, H.T Diehl, M Diesburg, G Di Loreto, S Doulas, P Draper, Y Ducros, L.V Dudko, S.R Dugad, A Dyshkant, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, J Estrada, H Evans, V.N Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, H.E Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, K.C Frame, S Fuess, E Gallas, A.N Galyaev, P Gartung, V Gavrilov, R.J Genik II, K Genser, C.E Gerber, Y Gershtein, B Gibbard, R Gilmartin, G Ginther, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, P.D Grannis, J.A Green, H Greenlee, S Grinstein, P Grudberg, S Grünendahl, G Guglielmo, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, K.S Hahn, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, C Hays, C Hebert, D Hedin, A.P Heinson, U Heintz, T Heuring, R Hirosky, J.D Hobbs, B Hoeneisen, J.S Hoftun, A.S Ito, S.A Jerger, R Jesik, T Joffe-Minor, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, A Juste, S Kahn, E Kajfasz, D Karmanov, D Karmgard, R Kehoe, S.K Kim, B Klima, C Klopfenstein, B Knuteson, W Ko, J.M Kohli, A.V Kostritskiy, J Kotcher, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, G Landsberg, A Leflat, F Lehner, J Li, Q.Z Li, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, J.G Lu, A Lucotte, L Lueking, C Lundstedt, A.K.A Maciel, R.J Madaras, V Manankov, S Mani, H.S Mao, T Marshall, M.I Martin, R.D Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, J McDonald, T McMahon, H.L Melanson, X.C Meng, M Merkin, K.W Merritt, C Miao, H Miettinen, D Mihalcea, A Mincer, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, V.S Narasimham, H.A Neal, J.P Negret, S Negroni, D Norman, L Oesch, V Oguri, B Olivier, N Oshima, P Padley, L.J Pan, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, M Peters, R Piegaia, H Piekarz, B.G Pope, E Popkov, H.B Prosper, S Protopopescu, J Qian, P.Z Quintas, R Raja, S Rajagopalan, N.W Reay, S Reucroft, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, A Santoro, L Sawyer, R.D Schamberger, H Schellman, A Schwartzman, J Sculli, N Sen, E Shabalina, H.C Shankar, R.K Shivpuri, D Shpakov, M Shupe, R.A Sidwell, V Simak, H Singh, J.B Singh, V Sirotenko, P Slattery, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, X.F Song, V Sorı́n, M Sosebee, N Sotnikova, K Soustruznik, M Souza, N.R Stanton, G Steinbrück, R.W Stephens, M.L Stevenson, F Stichelbaut, D Stoker, V Stolin, D.A Stoyanova, M Strauss, K Streets, M Strovink, L Stutte, A Sznajder, W Taylor, S Tentindo-Repond, T.L.T Thomas, J Thompson, D Toback, T.G Trippe, A.S Turcot, P.M Tuts, P van Gemmeren, V Vaniev, R Van Kooten, N Varelas, A.A Volkov, A.P Vorobiev, H.D Wahl, H Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, D Whiteson, J.A Wightman, S Willis, S.J Wimpenny, J.V.D Wirjawan, J Womersley, D.R Wood, R Yamada, P Yamin, T Yasuda, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, H Zheng, Z Zhou, Z.H Zhu, M Zielinski, D Zieminska, A Zieminski, V Zutshi, E.G Zverev, and A Zylberstejn

Subjects
Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Tevatron, 01 natural sciences, 7. Clean energy, Bottom quark, law.invention, Cross section (physics), law, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, 010306 general physics, Collider
Abstract

We present measurements of the b-bbar production cross section and angular correlations using the D0 detector at the Fermilab Tevatron p-pbar Collider operating at sqrt(s) = 1.8 TeV. The b quark production cross section for |y(b)| 6 GeV/c is extracted from single muon and dimuon data samples. The results agree in shape with the next-to-leading order QCD calculation of heavy flavor production but are greater than the central values of these predictions. The angular correlations between b and bbar quarks, measured from the azimuthal opening angle between their decay muons, also agree in shape with the next-to-leading order QCD prediction.

Published
2000

23. Search for the decay b→Xμ+μ−

Author

B. Abbott, M. Abolins, B.S. Acharya, I. Adam, D.L. Adams, M. Adams, S. Ahn, H. Aihara, G.A. Alves, N. Amos, E.W. Anderson, R. Astur, M.M. Baarmand, A. Baden, V. Balamurali, J. Balderston, B. Baldin, S. Banerjee, J. Bantly, E. Barberis, J.F. Bartlett, K. Bazizi, A. Belyaev, S.B. Beri, I. Bertram, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Bhattacharjee, N. Biswas, G. Blazey, S. Blessing, P. Bloom, A. Boehnlein, N.I. Bojko, F. Borcherding, C. Boswell, A. Brandt, R. Brock, A. Bross, D. Buchholz, V.S. Burtovoi, J.M. Butler, W. Carvalho, D. Casey, Z. Casilum, H. Castilla-Valdez, D. Chakraborty, S.-M. Chang, S.V. Chekulaev, L.-P. Chen, W. Chen, S. Choi, S. Chopra, B.C. Choudhary, J.H. Christenson, M. Chung, D. Claes, A.R. Clark, W.G. Cobau, J. Cochran, L. Coney, W.E. Cooper, C. Cretsinger, D. Cullen-Vidal, M.A.C. Cummings, D. Cutts, O.I. Dahl, K. Davis, K. De, K. Del Signore, M. Demarteau, D. Denisov, S.P. Denisov, H.T. Diehl, M. Diesburg, G. Di Loreto, P. Draper, Y. Ducros, L.V. Dudko, S.R. Dugad, D. Edmunds, J. Ellison, V.D. Elvira, R. Engelmann, S. Eno, G. Eppley, P. Ermolov, O.V. Eroshin, V.N. Evdokimov, T. Fahland, M.K. Fatyga, S. Feher, D. Fein, T. Ferbel, G. Finocchiaro, H.E. Fisk, Y. Fisyak, E. Flattum, G.E. Forden, M. Fortner, K.C. Frame, S. Fuess, E. Gallas, A.N. Galyaev, P. Gartung, T.L. Geld, R.J. Genik II, K. Genser, C.E. Gerber, B. Gibbard, S. Glenn, B. Gobbi, A. Goldschmidt, B. Gómez, G. Gómez, P.I. Goncharov, J.L. González Solı́s, H. Gordon, L.T. Goss, K. Gounder, A. Goussiou, N. Graf, P.D. Grannis, D.R. Green, H. Greenlee, G. Grim, S. Grinstein, N. Grossman, P. Grudberg, S. Grünendahl, G. Guglielmo, J.A. Guida, J.M. Guida, A. Gupta, S.N. Gurzhiev, P. Gutierrez, Y.E. Gutnikov, N.J. Hadley, H. Haggerty, S. Hagopian, V. Hagopian, K.S. Hahn, R.E. Hall, P. Hanlet, S. Hansen, J.M. Hauptman, D. Hedin, A.P. Heinson, U. Heintz, R. Hernández-Montoya, T. Heuring, R. Hirosky, J.D. Hobbs, B. Hoeneisen, J.S. Hoftun, F. Hsieh, Ting Hu, Tong Hu, T. Huehn, A.S. Ito, E. James, J. Jaques, S.A. Jerger, R. Jesik, J.Z.-Y. Jiang, T. Joffe-Minor, K. Johns, M. Johnson, A. Jonckheere, M. Jones, H. Jöstlein, S.Y. Jun, C.K. Jung, S. Kahn, G. Kalbfleisch, J.S. Kang, D. Karmanov, D. Karmgard, R. Kehoe, M.L. Kelly, C.L. Kim, S.K. Kim, A. Klatchko, B. Klima, C. Klopfenstein, V.I. Klyukhin, V.I. Kochetkov, J.M. Kohli, D. Koltick, A.V. Kostritskiy, J. Kotcher, A.V. Kotwal, J. Kourlas, A.V. Kozelov, E.A. Kozlovski, J. Krane, M.R. Krishnaswamy, S. Krzywdzinski, S. Kunori, S. Lami, R. Lander, F. Landry, G. Landsberg, B. Lauer, A. Leflat, H. Li, J. Li, Q.Z. Li-Demarteau, J.G.R. Lima, D. Lincoln, S.L. Linn, J. Linnemann, R. Lipton, Y.C. Liu, F. Lobkowicz, S.C. Loken, S. Lökös, L. Lueking, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, R. Madden, L. Magaña-Mendoza, V. Manankov, S. Mani, H.S. Mao, R. Markeloff, T. Marshall, M.I. Martin, K.M. Mauritz, B. May, A.A. Mayorov, R. McCarthy, J. McDonald, T. McKibben, J. McKinley, T. McMahon, H.L. Melanson, M. Merkin, K.W. Merritt, H. Miettinen, A. Mincer, C.S. Mishra, N. Mokhov, N.K. Mondal, H.E. Montgomery, P. Mooney, H. da Motta, C. Murphy, F. Nang, M. Narain, V.S. Narasimham, A. Narayanan, H.A. Neal, J.P. Negret, P. Nemethy, D. Norman, L. Oesch, V. Oguri, E. Oliveira, E. Oltman, N. Oshima, D. Owen, P. Padley, A. Para, Y.M. Park, R. Partridge, N. Parua, M. Paterno, B. Pawlik, J. Perkins, M. Peters, R. Piegaia, H. Piekarz, Y. Pischalnikov, V.M. Podstavkov, B.G. Pope, H.B. Prosper, S. Protopopescu, J. Qian, P.Z. Quintas, R. Raja, S. Rajagopalan, O. Ramirez, L. Rasmussen, S. Reucroft, M. Rijssenbeek, T. Rockwell, M. Roco, N.A. Roe, P. Rubinov, R. Ruchti, J. Rutherfoord, A. Sánchez-Hernández, A. Santoro, L. Sawyer, R.D. Schamberger, H. Schellman, J. Sculli, E. Shabalina, C. Shaffer, H.C. Shankar, R.K. Shivpuri, M. Shupe, H. Singh, J.B. Singh, V. Sirotenko, W. Smart, E. Smith, R.P. Smith, R. Snihur, G.R. Snow, J. Snow, S. Snyder, J. Solomon, P.M. Sood, M. Sosebee, N. Sotnikova, M. Souza, A.L. Spadafora, G. Steinbrück, R.W. Stephens, M.L. Stevenson, D. Stewart, F. Stichelbaut, D.A. Stoianova, D. Stoker, M. Strauss, K. Streets, M. Strovink, A. Sznajder, P. Tamburello, J. Tarazi, M. Tartaglia, T.L.T. Thomas, J. Thompson, T.G. Trippe, P.M. Tuts, N. Varelas, E.W. Varnes, D. Vititoe, A.A. Volkov, A.P. Vorobiev, H.D. Wahl, G. Wang, J. Warchol, G. Watts, M. Wayne, H. Weerts, A. White, J.T. White, J.A. Wightman, S. Willis, S.J. Wimpenny, J.V.D. Wirjawan, J. Womersley, E. Won, D.R. Wood, H. Xu, R. Yamada, P. Yamin, J. Yang, T. Yasuda, P. Yepes, C. Yoshikawa, S. Youssef, J. Yu, Y. Yu, Z.H. Zhu, D. Zieminska, A. Zieminski, E.G. Zverev, and A. Zylberstejn

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Branching fraction, Detector, High Energy Physics::Experiment, Fermilab, Limit (mathematics)
Abstract

We have searched for the flavor-changing neutral current decay b -> s mu+ mu- in p pbar collisions at sqrt(s) = 1.8 TeV with the DO detector at Fermilab. We determine the 90% confidence level limit for the branching fraction to be B(b -> X_s mu+ mu-) < 3.2 x 10^{-4}. We argue that this limit is more stringent than the best published limit on this decay rate.

Published
1998

24. Collider Physics: SDC/SSC liquified fiber calorimetry. Progress report, 1992

Author

F.R. Huson and J.T. White

Subjects
Nuclear physics, Physics, Quark, Particle physics, Data acquisition, Physics::Instrumentation and Detectors, Detector, Attenuation length, Supersymmetry, Fiber, Fermilab, Calorimetry
Abstract

Most effort was directed toward the D-Zero experiment at Fermilab. Over 3 pb{sup {minus}1} of high-quality physics data have been obtained. Analysis of the results (wino-zino physics, squark physics), D-zero data acquisition systems efforts, and level-1 and level-2 trigger work are described. Other work concerned detector development for use at the SSC. This technology consists of using liquid scintillator-filled tubes as scintillating fibers for a ``calorimeter.`` The key issues were to demonstrate that the liquid fibers were sufficiently rad-hard and to demonstrate that fibers with sufficiently long attenuation length could be found to satisfy the resolution requirements; both constraints could be satisfied.

Published
1992

25. Collider Physics: SDC/SSC liquified fiber calorimetry. [Physics Dept. , Texas A M Univ]

Author

J.T. White and F.R. Huson

Subjects
Physics, Nuclear physics, Particle physics, Data acquisition, Physics::Instrumentation and Detectors, Detector, Scintillation counter, Attenuation length, Measuring instrument, Fiber, Fermilab, Particle detector
Abstract

Most effort was directed toward the D-Zero experiment at Fermilab. Over 3 pb[sup [minus]1] of high-quality physics data have been obtained. Analysis of the results (wino-zino physics, squark physics), D-zero data acquisition systems efforts, and level-1 and level-2 trigger work are described. Other work concerned detector development for use at the SSC. This technology consists of using liquid scintillator-filled tubes as scintillating fibers for a calorimeter.'' The key issues were to demonstrate that the liquid fibers were sufficiently rad-hard and to demonstrate that fibers with sufficiently long attenuation length could be found to satisfy the resolution requirements; both constraints could be satisfied.

Published
1992

26. Results of the material screening program of the NEXT experiment

Author

G. Martínez-Lema, F.J. Iguaz, Luis M. Serra, D. Lorca, L.M.P. Fernandes, F.I.G.M. Borges, C.M.B. Monteiro, F.J. Mora, N. Yahlali, A. Simón, V. M. Gehman, J.A. Villar, Diego González-Díaz, T. Dafni, V. Álvarez, J. S. Díaz, H. Gómez, J. Martín-Albo, J.J. Gómez-Cadenas, J.M.F. dos Santos, T. Miller, Alessandro Bettini, A Rodríguez, C.A.N. Conde, Luis Labarga, J.T. White, A. Goldschmidt, J. Hauptman, L.M. Moutinho, J. Torrent, M. Sorel, F. Monrabal, L. Ripoll, Marta Losada, A.L. Ferreira, F.P. Santos, M. Nebot-Guinot, Roberto Gutiérrez, I. Liubarsky, J. A. Hernando Morata, D.C. Herrera, A. Marí, I. C. Bandac, J.F. Toledo, S. Cárcel, C. Sofka, A. Martínez, Javier Rodríguez, Manuel Camargo, M. Monserrate, J. Muñoz Vidal, A. Cervera, D. Shuman, Marcos Fernandez, S. Cebrián, R. C. Webb, Romain Esteve, Javier Pérez, J.F.C.A. Veloso, E.D.C. Freitas, G. Luzón, L. Segui, I. G. Irastorza, Paola Ferrario, D. R. Nygren, A. Laing, Zviad Tsamalaidze, J. Renner, J.L. Pérez Aparicio, and C. A. B. Oliveira

Subjects
MECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURAS, Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, Nuclear engineering, FOS: Physical sciences, chemistry.chemical_element, Radiopurity, 01 natural sciences, High Energy Physics - Experiment, TECNOLOGIA ELECTRONICA, High Energy Physics - Experiment (hep-ex), Xenon, Double beta decay, 0103 physical sciences, Germanium gamma spectrometry, Nuclear Experiment (nucl-ex), Gamma ray spectrometry, 010306 general physics, Nuclear Experiment, Physics, Measurement method, 010308 nuclear & particles physics, Gamma ray spectrometer, Canfranc Underground Laboratory, Espectrometria de raigs gamma, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, chemistry, Neutrino
Abstract

The 'Neutrino Experiment with a Xenon TPC (NEXT)', intended to investigate neutrinoless double beta decay, requires extremely low background levels. An extensive material screening and selection process to assess the radioactivity of components is underway combining several techniques, including germanium gamma-ray spectrometry performed at the Canfranc Underground Laboratory; recent results of this material screening program are presented here., Proceedings for a poster contribution at ICHEP 2014, Valencia, Spain

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27. Color coherent radiation in multijet events from pp- collisions at √s = 1.8 TeV

Author

B. Abbott, M. Abolins, B.S. Acharya, I. Adam, D.L. Adams, M. Adams, S. Ahn, H. Aihara, G.A. Alves, E. Amidi, N. Amos, E.W. Anderson, R. Astur, M.M. Baarmand, A. Baden, V. Balamurali, J. Balderston, B. Baldin, S. Banerjee, J. Bantly, J.F Bartlett, K. Bazizi, A. Belyaev, S.B. Beri, I. Bertram, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Bhattacharjee, N. Biswas, G. Blazey, S. Blessing, P. Bloom, A. Boehnlein, N.I. Bojko, F. Borcherding, C. Boswell, A. Brandt, R. Brock, A. Bross, D. Buchholz, V.S. Burtovoi, J.M. Butler, W. Carvalho, D. Casey, Z. Casilum, H. Castilla-Valdez, D. Chakraborty, S.-M. Chang, S.V. Chekulaev, L.-P. Chen, W. Chen, S. Choi, S. Chopra, B.C. Choudhary, J.H. Christenson, M. Chung, D. Claes, A.R. Clark, W.G. Cobau, J. Cochran, W.E. Cooper, C. Cretsinger, D. Cullen-Vidal, M.A.C. Cummings, D. Cutts, O.I. Dahl, K. Davis, K. De, K. Del Signore, M. Demarteau, D. Denisov, S.P. Denisov, H.T. Diehl, M. Diesburg, G. Di Loreto, P. Draper, Y. Ducros, L.V. Dudko, S.R. Dugad, D. Edmunds, J. Ellison, V.D. Elvira, R. Engelmann, S. Eno, G. Eppley, P. Ermolov, O.V. Eroshin, V.N. Evdokimov, T. Fahland, M. Fatyga, M.K. Fatyga, S. Feher, D. Fein, T. Ferbel, G. Finocchiaro, H.E. Fisk, Y. Fisyak, E. Flattum, G.E. Forden, M. Fortner, K.C. Frame, S. Fuess, E. Gallas, A.N. Galyaev, P. Gartung, T.L. Geld, R.J. Genik, K. Genser, C.E. Gerber, B. Gibbard, S. Glenn, B. Gobbi, M. Goforth, A. Goldschmidt, B. Gómez, G. Gómez, P.I. Goncharov, J.L. González Solís, H. Gordon, L.T. Goss, K. Gounder, A. Goussiou, N. Graf, P.D. Grannis, D.R. Green, J. Green, H. Greenlee, G. Grim, S. Grinstein, N. Grossman, P. Grudberg, S. Grünendahl, G. Guglielmo, J.A. Guida, J.M. Guida, A. Gupta, S.N. Gurzhiev, P. Gutierrez, Y.E. Gutnikov, N.J. Hadley, H. Haggerty, S. Hagopian, V. Hagopian, K.S. Hahn, R.E. Hall, P. Hanlet, S. Hansen, J.M. Hauptman, D. Hedin, A.P. Heinson, U. Heintz, R. Hernández-Montoya, T. Heuring, R. Hirosky, J.D. Hobbs, B. Hoeneisen, J.S. Hoftun, F. Hsieh, Ting Hu, Tong Hu, T. Huehn, A.S. Ito, E. James, J. Jaques, S.A. Jerger, R. Jesik, J.Z.-Y. Jiang, T. Joffe-Minor, K. Johns, M. Johnson, A. Jonckheere, M. Jones, H. Jöstlein, S.Y. Jun, C.K. Jung, S. Kahn, G. Kalbfleisch, J.S. Kang, D. Karmgard, R. Kehoe, M.L. Kelly, C.L. Kim, S.K. Kim, A. Klatchko, B. Klima, C. Klopfenstein, V.I. Klyukhin, V.I. Kochetkov, J.M. Kohli, D. Koltick, A.V. Kostritskiy, J. Kotcher, A.V. Kotwal, J. Kourlas, A.V. Kozelov, E.A. Kozlovski, J. Krane, M.R. Krishnaswamy, S. Krzywdzinski, S. Kunori, S. Lami, H. Lan, R. Lander, F. Landry, G. Landsberg, B. Lauer, A. Leflat, H. Li, J. Li, Q.Z. Li-Demarteau, J.G.R. Lima, D. Lincoln, S.L. Linn, J. Linnemann, R. Lipton, Y.C. Liu, F. Lobkowicz, S.C. Loken, S. Lökös, L. Lueking, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, R. Madden, L. Magaña-Mendoza, S. Mani, H.S. Mao, R. Markeloff, T. Marshall, M.I. Martin, K.M. Mauritz, B. May, A.A. Mayorov, R. McCarthy, J. McDonald, T. McKibben, J. McKinley, T. McMahon, H.L. Melanson, M. Merkin, K.W. Merritt, H. Miettinen, A. Mincer, C.S. Mishra, N. Mokhov, N.K. Mondal, H.E. Montgomery, P. Mooney, H. da Motta, C. Murphy, F. Nang, M. Narain, V.S. Narasimham, A. Narayanan, H.A. Neal, J.P. Negret, P. Nemethy, M. Nicola, D. Norman, L. Oesch, V. Oguri, E. Oltman, N. Oshima, D. Owen, P. Padley, M. Pang, A. Para, Y.M. Park, R. Partridge, N. Parua, M. Paterno, J. Perkins, M. Peters, R. Piegaia, H. Piekarz, Y. Pischalnikov, V.M. Podstavkov, B.G. Pope, H.B. Prosper, S. Protopopescu, J. Qian, P.Z. Quintas, R. Raja, S. Rajagopalan, O. Ramirez, L. Rasmussen, S. Reucroft, M. Rijssenbeek, T. Rockwell, N.A. Roe, P. Rubinov, R. Ruchti, J. Rutherfoord, A. Sánchez-Hernández, A. Santoro, L. Sawyer, R.D. Schamberger, H. Schellman, J. Sculli, E. Shabalina, C. Shaffer, H.C. Shankar, R.K. Shivpuri, M. Shupe, H. Singh, J.B. Singh, V. Sirotenko, W. Smart, R.P. Smith, R. Snihur, G.R. Snow, J. Snow, S. Snyder, J. Solomon, P.M. Sood, M. Sosebee, N. Sotnikova, M. Souza, A.L. Spadafora, R.W. Stephens, M.L. Stevenson, D. Stewart, F. Stichelbaut, D.A. Stoianova, D. Stoker, M. Strauss, K. Streets, M. Strovink, A. Sznajder, P. Tamburello, J. Tarazi, M. Tartaglia, T.L.T. Thomas, J. Thompson, T.G. Trippe, P.M. Tuts, N. Varelas, E.W. Varnes, D. Vititoe, A.A. Volkov, A.P. Vorobiev, H.D. Wahl, G. Wang, J. Warchol, G. Watts, M. Wayne, H. Weerts, A. White, J.T. White, J.A. Wightman, S. Willis, S.J. Wimpenny, J.V.D. Wirjawan, J. Womersley, E. Won, D.R. Wood, H. Xu, R. Yamada, P. Yamin, J. Yang, T. Yasuda, P. Yepes, C. Yoshikawa, S. Youssef, J. Yu, Y. Yu, Z.H. Zhu, D. Zieminska, A. Zieminski, E.G. Zverev, and A. Zylberstejn

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Pseudorapidity, High Energy Physics::Phenomenology, Detector, Monte Carlo method, Tevatron, High Energy Physics::Experiment, Fermilab, Radiation, Coherence (physics)
Abstract

We report on a study of color coherence effects in pp- collisions at a center of mass energy √s = 1.8 TeV. The data were collected with the DØ detector during the 1992-1993 run of the Fermilab Tevatron Collider. We observe the presence of initial-to-final state color interference with the spatial correlations between soft and hard jets in multijet events in the central and in forward pseudorapidity regions. The results are compared to Monte Carlo simulations with different color coherence implementations and to the predictions of script O sign(α3s) QCD calculations. © 1997 Elsevier Science B.V.

28. First proof of topological signature in the high pressure xenon gas TPC with electroluminescence amplification for the NEXT experiment

Author

J.F.C.A. Veloso, E.D.C. Freitas, A. Goldschmidt, J. Hauptman, J.F. Toledo, S. Cárcel, P. Lebrun, N. Yahlali, D. Shuman, Romain Esteve, C.D.R. Azevedo, S. Cebrián, R. C. Webb, J.A. Villar, A. Martínez, D. R. Nygren, F.J. Mora, T. Dafni, A. Laing, M. Diesburg, Jorge Luis Rodriguez, A. Simón, I. G. Irastorza, Zviad Tsamalaidze, D. Lorca, M. Monserrate, Marta Losada, J.M.F. dos Santos, J. Muñoz Vidal, T. Miller, N. López-March, Javier Pérez, F.P. Santos, C.A.O. Henriques, Roberto Gutiérrez, J. S. Díaz, P. Novella, I. Liubarsky, J. Martín-Albo, J.J. Gómez-Cadenas, F. Monrabal, F.I.G.M. Borges, J.A. Hernando Morata, L.M. Moutinho, J. Torrent, Paola Ferrario, D. González-Díaz, V. M. Gehman, L. Ripoll, G. Luzón, C. Sofka, A. Para, M. Sorel, A.L. Ferreira, M. Nebot-Guinot, G. Martínez-Lema, J.T. White, L.M.P. Fernandes, A. Marí, M. Querol, A. Cervera, Luis M. Serra, C.M.B. Monteiro, Víctor H. Alvarez, H. Yepes-Ramírez, J. Renner, J.L. Pérez Aparicio, C.A.N. Conde, and Luis Labarga

Subjects
MECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURAS, Nuclear and High Energy Physics, chemistry.chemical_element, Topology (electrical circuits), Electron, Topology, 01 natural sciences, 7. Clean energy, Signal, Atomic, Mathematical Sciences, TECNOLOGIA ELECTRONICA, Nuclear physics, Xenon, Particle and Plasma Physics, Ionization, Double beta decay, 0103 physical sciences, Dark Matter, Nuclear, 010306 general physics, Double Beta Decay, Mathematical Physics, Physics, Quantum Physics, 010308 nuclear & particles physics, Molecular, Beta Decay, Nuclear & Particles Physics, Desintegració beta, chemistry, Dark matter (Astronomy), Physical Sciences, Decay chain, Matèria fosca (Astronomia), Energy (signal processing)
Abstract

[EN] The NEXT experiment aims to observe the neutrinoless double beta decay of 136Xe in a high-pressure xenon gas TPC using electroluminescence (EL) to amplify the signal from ionization. One of the main advantages of this technology is the possibility to reconstruct the topology of events with energies close to Qββ . This paper presents the first demonstration that the topology provides extra handles to reject background events using data obtained with the NEXT-DEMO prototype. Single electrons resulting from the interactions of 22Na 1275 keV gammas and electron-positron pairs produced by conversions of gammas from the 228Th decay chain were used to represent the background and the signal in a double beta decay. These data were used to develop algorithms for the reconstruction of tracks and the identification of the energy deposited at the end-points, providing an extra background rejection factor of 24.3 ± 1.4 (stat.)%, while maintaining an efficiency of 66.7 ± 1.% for signal events., This work was supported by the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the Ministerio de Economia y Competitividad of Spain under grants CONSOLIDER-Ingenio 2010 CSD2008-0037 (CUP), FPA2009-13697-C04 and FIS2012-37947-C04; the Portuguese FCT and FEDER through the program COMPETE, project PTDC/FIS/103860/2008; and the Fermi National Accelerator Laboratory under U.S. Department of Energy Contract No. DE-AC02-07CH11359

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29. Evidence of color coherence effects in W + jets events from pp collisions at √s = 1.8 TeV

Author

B. Abbott, M. Abolins, V. Abramov, B.S. Acharya, I. Adam, D.L. Adams, M. Adams, S. Ahn, V. Akimov, G.A. Alves, N. Amos, E.W. Anderson, M.M. Baarmand, V.V. Babintsev, L. Babukhadia, A. Baden, B. Baldin, S. Banerjee, J. Bantly, E. Barberis, P. Baringer, J.F. Bartlett, A. Belyaev, S.B. Beri, I. Bertram, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Bhattacharjee, G. Blazey, S. Blessing, P. Bloom, A. Boehnlein, N.I. Bojko, F. Borcherding, C. Boswell, A. Brandt, R. Breedon, G. Briskin, R. Brock, A. Bross, D. Buchholz, V.S. Burtovoi, J.M. Butler, W. Carvalho, D. Casey, Z. Casilum, H. Castilla-Valdez, D. Chakraborty, K.M. Chan, S.V. Chekulaev, W. Chen, D.K. Cho, S. Choi, S. Chopra, B.C. Choudhary, J.H. Christenson, M. Chung, D. Claes, A.R. Clark, W.G. Cobau, J. Cochran, L. Coney, W.E. Cooper, D. Coppage, C. Cretsinger, D. Cullen-Vidal, M.A.C. Cummings, D. Cutts, O.I. Dahl, K. Davis, K. De, K. Del Signore, M. Demarteau, D. Denisov, S.P. Denisov, H.T. Diehl, M. Diesburg, G. Di Loreto, P. Draper, Y. Ducros, L.V. Dudko, S.R. Dugad, A. Dyshkant, D. Edmunds, J. Ellison, V.D. Elvira, R. Engelmann, S. Eno, G. Eppley, P. Ermolov, O.V. Eroshin, J. Estrada, H. Evans, V.N. Evdokimov, T. Fahland, M.K. Fatyga, S. Feher, D. Fein, T. Ferbel, H.E. Fisk, Y. Fisyak, E. Flattum, G.E. Forden, M. Fortner, K.C. Frame, S. Fuess, E. Gallas, A.N. Galyaev, P. Gartung, V. Gavrilov, T.L. Geld, R.J. Genik II, K. Genser, C.E. Gerber, Y. Gershtein, B. Gibbard, G. Ginther, B. Gobbi, B. Gómez, G. Gómez, P.I. Goncharov, J.L. González Solı́s, H. Gordon, L.T. Goss, K. Gounder, A. Goussiou, N. Graf, P.D. Grannis, D.R. Green, J.A. Green, H. Greenlee, S. Grinstein, P. Grudberg, S. Grünendahl, G. Guglielmo, J.A. Guida, J.M. Guida, A. Gupta, S.N. Gurzhiev, G. Gutierrez, P. Gutierrez, N.J. Hadley, H. Haggerty, S. Hagopian, V. Hagopian, K.S. Hahn, R.E. Hall, P. Hanlet, S. Hansen, J.M. Hauptman, C. Hays, C. Hebert, D. Hedin, A.P. Heinson, U. Heintz, R. Hernández-Montoya, T. Heuring, R. Hirosky, J.D. Hobbs, B. Hoeneisen, J.S. Hoftun, F. Hsieh, Tong Hu, A.S. Ito, J. Jaques, S.A. Jerger, R. Jesik, T. Joffe-Minor, K. Johns, M. Johnson, A. Jonckheere, M. Jones, H. Jöstlein, S.Y. Jun, S. Kahn, D. Karmanov, D. Karmgard, R. Kehoe, S.K. Kim, B. Klima, C. Klopfenstein, B. Knuteson, W. Ko, J.M. Kohli, D. Koltick, A.V. Kostritskiy, J. Kotcher, A.V. Kotwal, A.V. Kozelov, E.A. Kozlovsky, J. Krane, M.R. Krishnaswamy, S. Krzywdzinski, M. Kubantsev, S. Kuleshov, Y. Kulik, S. Kunori, F. Landry, G. Landsberg, A. Leflat, J. Li, Q.Z. Li, J.G.R. Lima, D. Lincoln, S.L. Linn, J. Linnemann, R. Lipton, J.G. Lu, A. Lucotte, L. Lueking, A.K.A. Maciel, R.J. Madaras, R. Madden, L. Magaña-Mendoza, V. Manankov, S. Mani, H.S. Mao, R. Markeloff, T. Marshall, M.I. Martin, R.D. Martin, K.M. Mauritz, B. May, A.A. Mayorov, R. McCarthy, J. McDonald, T. McKibben, J. McKinley, T. McMahon, H.L. Melanson, M. Merkin, K.W. Merritt, C. Miao, H. Miettinen, A. Mincer, C.S. Mishra, N. Mokhov, N.K. Mondal, H.E. Montgomery, M. Mostafa, H. da Motta, F. Nang, M. Narain, V.S. Narasimham, A. Narayanan, H.A. Neal, J.P. Negret, P. Nemethy, D. Norman, L. Oesch, V. Oguri, N. Oshima, D. Owen, P. Padley, A. Para, N. Parashar, Y.M. Park, R. Partridge, N. Parua, M. Paterno, B. Pawlik, J. Perkins, M. Peters, R. Piegaia, H. Piekarz, Y. Pischalnikov, B.G. Pope, H.B. Prosper, S. Protopopescu, J. Qian, P.Z. Quintas, R. Raja, S. Rajagopalan, O. Ramirez, N.W. Reay, S. Reucroft, M. Rijssenbeek, T. Rockwell, M. Roco, P. Rubinov, R. Ruchti, J. Rutherfoord, A. Sánchez-Hernández, A. Santoro, L. Sawyer, R.D. Schamberger, H. Schellman, J. Sculli, E. Shabalina, C. Shaffer, H.C. Shankar, R.K. Shivpuri, D. Shpakov, M. Shupe, R.A. Sidwell, H. Singh, J.B. Singh, V. Sirotenko, P. Slattery, E. Smith, R.P. Smith, R. Snihur, G.R. Snow, J. Snow, S. Snyder, J. Solomon, X.F. Song, M. Sosebee, N. Sotnikova, M. Souza, N.R. Stanton, G. Steinbrück, R.W. Stephens, M.L. Stevenson, F. Stichelbaut, D. Stoker, V. Stolin, D.A. Stoyanova, M. Strauss, K. Streets, M. Strovink, A. Sznajder, P. Tamburello, J. Tarazi, M. Tartaglia, T.L.T. Thomas, J. Thompson, D. Toback, T.G. Trippe, P.M. Tuts, V. Vaniev, N. Varelas, E.W. Varnes, A.A. Volkov, A.P. Vorobiev, H.D. Wahl, J. Warchol, G. Watts, M. Wayne, H. Weerts, A. White, J.T. White, J.A. Wightman, S. Willis, S.J. Wimpenny, J.V.D. Wirjawan, J. Womersley, D.R. Wood, R. Yamada, P. Yamin, T. Yasuda, P. Yepes, K. Yip, C. Yoshikawa, S. Youssef, J. Yu, Y. Yu, M. Zanabria, Z. Zhou, Z.H. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi, E.G. Zverev, and A. Zylberstejn

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Monte Carlo method, Detector, Tevatron, High Energy Physics::Experiment, Fermilab, Coherence (physics)
Abstract

We report the results of a study of color coherence effects in pp collisions based on data collected by the DØ detector during the 1994-1995 run of the Fermilab Tevatron Collider, at a center of mass energy √s = 1.8 TeV. Initial-to-final state color interference effects are observed by examining particle distribution patterns in events with a W boson and at least one jet. The data are compared to Monte Carlo simulations with different color coherence implementations and to an analytic modified-leading-logarithm perturbative calculation based on the local parton-hadron duality hypothesis. © 1999 Published by Elsevier Science B.V. All rights reserved.

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