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4. Search for WIMP-129Xe inelastic scattering with particle identification in XMASS-I

Author

Kimiaki Masuda, Yong Hamb Kim, Y. Takeuchi, Y. D. Kim, Katsuhiko Sato, Kentaro Miuchi, K.B. Lee, Masaki Yamashita, K. Martens, N. Oka, Nam Young Kim, Hiroshi Ogawa, T. Suzuki, K. Kobayashi, Yoshitaka Itow, Yoshihiro Suzuki, K. Kanzawa, Lee Min-Kie, Masayuki Nakahata, Shogo Nakamura, B. D. Xu, Hiroyuki Sekiya, Atsushi Takeda, Y. Fukuda, Shigetaka Moriyama, Katsuki Hiraide, Ken-Ichi Fushimi, G. Kanzaki, Motoki Kobayashi, Shigeki Tasaka, M. Miyasaka, Yasuhiro Kishimoto, Ko Abe, K. Nishijima, B. S. Yang, and Koichi Ichimura

Subjects
Physics, Scintillation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, Inelastic scattering, 01 natural sciences, Particle identification, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), WIMP, Weakly interacting massive particles, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010303 astronomy & astrophysics, Event (particle physics), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

A search for Weakly Interacting Massive Particles (WIMPs) was conducted with the single-phase liquid-xenon detector XMASS through inelastic scattering in which $^{129}$Xe nuclei were excited, using an exposure ($\rm 327\; kg \times 800.0 \; days$) 48 times larger than that of our previous study. The inelastic excitation sensitivity was improved by detailed evaluation of background, event classification based on scintillation timing that distinguished $\gamma$-rays and $\beta$-rays, and simultaneous fitting of the energy spectra of $\gamma$-like and $\beta$-like samples. No evidence of a WIMP signal was found. Thus, we set the upper limits of the inelastic channel cross section at 90\% confidence level, for example, $4.1\times 10^{-39} \;{\rm cm^2}$ for a $200\; {\rm GeV}/c^2$ WIMP. This result provides the most stringent limits on the SD WIMP-neutron interaction and is better by a factor of 7.7 at $200\;{\rm GeV}/c^2$ than the existing experimental limit., Comment: 8 pages, 10 figures

Published
2019

5. Development of low radioactivity photomultiplier tubes for the XMASS-I detector

Author

Ko Abe, M. Kobayashi, N. Oka, Yong Hamb Kim, Hiroshi Ogawa, K. Martens, Hiroyuki Sekiya, Y. Fukuda, Yasuhiro Kishimoto, K. Kanzawa, Nam Young Kim, M. Miyasaka, T. Norita, K. Nishijima, Shigetaka Moriyama, Katsuki Hiraide, Shogo Nakamura, Y. Takeuchi, K.B. Lee, Yoshihiro Suzuki, Kentaro Miuchi, Koichi Ichimura, Lee Min-Kie, Kimiaki Masuda, G. Kanzaki, R. Fujita, Masayuki Nakahata, H. Takiya, Yoshitaka Itow, O. Takachio, Y. D. Kim, Masaki Yamashita, R. Kegasa, K. Kobayashi, Katsuhiko Sato, B. D. Xu, B. S. Yang, K. Hosokawa, Atsushi Takeda, Ken-Ichi Fushimi, and Shigeki Tasaka

Subjects
Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Xenon, 0103 physical sciences, Screening method, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Hexagonal crystal system, business.industry, Detector, Dynode, Instrumentation and Detectors (physics.ins-det), chemistry, Photonics, business, Kovar, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

XMASS-I is a single-phase liquid xenon detector whose purpose is direct detection of dark matter. To achieve the low background requirements necessary in the detector, a new model of photomultiplier tubes (PMTs), R10789, with a hexagonal window was developed based on the R8778 PMT used in the XMASS prototype detector. We screened the numerous component materials for their radioactivity. During development, the largest contributions to the reduction of radioactivity came from the stem and the dynode support. The glass stem was exchanged to the Kovar alloy one and the ceramic support were changed to the quartz one. R10789 is the first model of Hamamatsu Photonics K. K. that adopted these materials for low background purposes and provided a groundbreaking step for further reductions of radioactivity in PMTs. Measurements with germanium detectors showed 1.2$\pm$0.3 mBq/PMT of $^{226}$Ra, less than 0.78 mBq/PMT of $^{228}$Ra, 9.1$\pm$2.2 mBq/PMT of $^{40}$K, and 2.8$\pm$0.2 mBq/PMT of $^{60}$Co. In this paper, the radioactive details of the developed R10789 are described together with our screening methods and the components of the PMT., Comment: 7 pages, 3 figures

Published
2019

9. Search for dark matter in the form of hidden photons and axion-like particles in the XMASS detector

Author

Katsuki Hiraide, Y. D. Kim, Kentaro Miuchi, Shigeki Tasaka, K. Kobayashi, Hiroshi Ogawa, K. Nishijima, Shigetaka Moriyama, Y. Takeuchi, Takatoshi Suzuki, Masayuki Nakahata, K.B. Lee, Yong Hamb Kim, Nam Young Kim, B. S. Yang, M. Kobayashi, Yasuhiro Kishimoto, Masaki Yamashita, B. D. Xu, Kimiaki Masuda, Lee Min-Kie, Yoshitaka Itow, Atsushi Takeda, Hiroyuki Sekiya, Y. Fukuda, O. Takachio, K. Martens, G. Kanzaki, Ken-Ichi Fushimi, Yoshihiro Suzuki, Ko Abe, Koichi Ichimura, K. Kanzawa, M. Miyasaka, Katsuhiko Sato, N. Oka, and Shogo Nakamura

Subjects
Nuclear and High Energy Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics - Instrumentation and Detectors, Cold dark matter, Photon, Physics::Instrumentation and Detectors, media_common.quotation_subject, Dark matter, FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, 0103 physical sciences, Axion-like particle, 010306 general physics, Axion, Low background, media_common, Boson, Physics, Range (particle radiation), 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), lcsh:QC1-999, Universe, chemistry, Hidden photon, Liquid xenon, lcsh:Physics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Hidden photons and axion-like particles are candidates for cold dark matter if they were produced non-thermally in the early universe. We conducted a search for both of these bosons using 800 live-days of data from the XMASS detector with 327 kg of liquid xenon in the fiducial volume. No significant signal was observed, and thus we set constraints on the $\alpha' / \alpha$ parameter related to kinetic mixing of hidden photons and the coupling constant $g_{Ae}$ of axion-like particles in the mass range from 40 to 120 keV/$c^2$, resulting in $\alpha' / \alpha < 6 \times 10^{-26}$ and $g_{Ae} < 4 \times 10^{-13}$. These limits are the most stringent derived from both direct and indirect searches to date., Comment: 18 pages, 5 figures

Published
2018

10. Formation of multishell Au@Ag@Pt nanoparticles by coreduction method: a microscopic study

Author

R. Teranishi, Y. Takeuchi, Kenji Kaneko, Hitoshi Kasai, Anh Thi Ngoc Dao, and H. J. Lee

Subjects
Materials science, Nanostructure, Polymers and Plastics, chemistry.chemical_element, Redox, Catalysis, Electronic, Optical and Magnetic Materials, Biomaterials, Colloid and Surface Chemistry, Chemical engineering, chemistry, Materials Chemistry, Galvanic replacement reaction, Pt nanoparticles, Metal nanoparticles, Platinum
Abstract

Metallic nanoparticles of Ag–Pt double-shell on Au-core (Au@Ag@Pt core@multishell NPs) with a hollow-granular shell structure were synthesized by coreduction method, a combination of galvanic replacement reaction with a coreducing agent. Their nanostructures were examined in detail at different reduction reaction periods to gain insights into the mechanism of Ag–Pt double-shell formation on Au-core, as well as the competitive role of each reduction reaction. The multishell NPs were found to contain a degree of hollows with the inner surface composed of both Ag and Pt, while the outer surface composed of granular Pt. The coreduction method contributed to the success of increasing Pt surface area that will further benefit catalytic applications of the NPs.

Published
2021

12. Search for event bursts in XMASS-I associated with gravitational-wave events

Author

K. Martens, Kentaro Miuchi, Motoki Kobayashi, Y. Takeuchi, Masayuki Nakahata, Shogo Nakamura, Masaki Yamashita, B. D. Xu, Nam Young Kim, H. Ogawa, K.B. Lee, K. Kanzawa, B. S. Yang, Atsushi Takeda, Kimiaki Masuda, N. Oka, Shigeki Tasaka, G. Kanzaki, Ken-Ichi Fushimi, Hiroyuki Sekiya, Y. Fukuda, Katsuki Hiraide, T. Suzuki, K. Abe, M. Miyasaka, Yeongduk Kim, Yoshihiro Suzuki, Shigetaka Moriyama, Ken-ichiro Kobayashi, Yoshitaka Itow, Yong Hamb Kim, Yasuhiro Kishimoto, K. Nishijima, Katsuhiko Sato, Lee Min-Kie, and Koichi Ichimura

Subjects
Physics, 010308 nuclear & particles physics, Scattering, Gravitational wave, Astrophysics::High Energy Astrophysical Phenomena, Event (relativity), Detector, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, LIGO, Neutron star, Binary black hole, 0103 physical sciences, Neutrino, 010303 astronomy & astrophysics
Abstract

We performed a search for event bursts in the XMASS-I detector associated with 11 gravitational-wave events detected during LIGO/Virgo’s O1 and O2 periods. Simple and loose cuts were applied to the data collected in the full 832 kg xenon volume around the detection time of each gravitational-wave event. The data were divided into four energy regions ranging from keV to MeV. Without assuming any particular burst models, we looked for event bursts in sliding windows with various time width from 0.02 to 10 s. The search was conducted in a time window between − 400 and + 10 , 000 s from each gravitational-wave event. For the binary neutron star merger GW170817, no significant event burst was observed in the XMASS-I detector and we set 90% confidence level upper limits on neutrino fluence for the sum of all the neutrino flavors via coherent elastic neutrino-nucleus scattering. The obtained upper limit was (1.3–2.1) × 10 11 cm − 2 under the assumption of a Fermi-Dirac spectrum with average neutrino energy of 20 MeV. The neutrino fluence limits for mono-energetic neutrinos in the energy range between 14 and 100 MeV were also calculated. Among the other 10 gravitational wave events detected as the binary black hole mergers, a burst candidate with a 3.0 σ significance was found at 1801.95–1803.95 s in the analysis for GW151012. However, no significant deviation from the background in the reconstructed energy and position distributions was found. Considering the additional look-elsewhere effect of analyzing the 11 GW events, the significance of finding such a burst candidate associated with any of them is 2.1 σ .

Published
2021

13. Measurement of radon concentration in super-Kamiokande’s buffer gas

Author

Shigeki Tasaka, Y. Takeuchi, Masayuki Nakahata, Hiroyuki Sekiya, Yuuki Nakano, M. Matsubara, and R. A. Wendell

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Buffer gas, Detector, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Radon, Instrumentation and Detectors (physics.ins-det), Contamination, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry, Activated charcoal, 0103 physical sciences, Calibration, 010306 general physics, Super-Kamiokande, Instrumentation, Carbon
Abstract

To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as 0.33$\pm$0.07 mBq/m$^{3}$. In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the buffer gas layer above Super-Kamiokande. In March 2013, the chilled activated charcoal system used to remove radon in the input buffer gas was upgraded. After this improvement, a dramatic reduction in the radon concentration of the supply gas down to 0.08 $\pm$ 0.07 mBq/m$^{3}$. Additionally, the Rn concentration of the in-situ buffer gas has been measured 28.8$\pm$1.7 mBq/m$^{3}$ using the new radon detector. Based on these measurements we have determined that the dominant source of Rn in the buffer gas arises from contamination from the Super-Kamiokande tank itself., Comment: 15 pages, 9 figures (accepted for publication in Nuclear Inst. and Methods in Physics Research, A)

Published
2017

14. Investigations of charge-changing processes for light proton-rich nuclei on carbon and solid-hydrogen targets

Author

K. Sawahata, Yukina Ichikawa, Susumu Okada, S. Sato, Shinji Suzuki, Takayuki Yamaguchi, Toshio Suzuki, S. Matsunaga, Akira Ozawa, N. Inaba, D. Nagae, Atsushi Kitagawa, Y. Saito, Tetsuaki Moriguchi, Yoko Ishibashi, Juzo Zenihiro, Yasushi Abe, and Y. Takeuchi

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, Proton, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, Charge (physics), Radius, 01 natural sciences, Zigzag, chemistry, Solid hydrogen, 0103 physical sciences, sense organs, Atomic physics, skin and connective tissue diseases, Nuclear Experiment, 010306 general physics, Carbon
Abstract

We investigated charge-changing processes (total charge-changing cross sections and partial charge-changing cross sections) for light proton-rich nuclei (34–36Ar, 33Cl, 25–28Si) at around 300A MeV on carbon and solid-hydrogen targets. We estimated the nuclear proton point radii of 33Cl and 25,26,27Si from the observed total charge-changing cross sections by using Glauber-model calculations with a phenomenological correction factor. Furthermore, we estimated the proton skin thickness for 33Cl coupled with its previously observed matter radius. From investigations of the partial charge-changing cross sections, clear zigzag pattern was observed for all isotopes. The present studies suggest that the pattern may be common in the proton-rich side, and depends on the odd–even nature of the fragment charge.

Published
2017

15. Detectability of galactic supernova neutrinos coherently scattered on xenon nuclei in XMASS

Author

Y. Takeuchi, K.B. Lee, Shogo Nakamura, N. Oka, R. Fujita, Hiroyuki Sekiya, Y. Fukuda, Shigeki Tasaka, Nam Young Kim, Kazuhiko Nakagawa, K. Martens, Masayuki Nakahata, Masaki Yamashita, Kentaro Miuchi, Y. Onishi, Koichi Ichimura, Hiroshi Ogawa, Ko Abe, K. Hosokawa, Y. D. Kim, I. Murayama, B.S. Yang, Yoshihiro Suzuki, Katsuki Hiraide, Atsushi Takeda, Yasuhiro Kishimoto, K. Fujii, Jing Liu, Jong-Man Lee, K. Kobayashi, Lee Min-Kie, T. Norita, Kimiaki Masuda, K. Nishijima, Shigetaka Moriyama, M. Kobayashi, H. Takiya, Yoshitaka Itow, Yong Hamb Kim, R. Kegasa, O. Takachio, and H. Uchida

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM), Stellar evolution, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Betelgeuse, Astroparticle physics, Physics, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Solar neutrino problem, Supernova, Neutrino detector, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The coherent elastic neutrino-nucleus scattering (CEvNS) plays a crucial role at the final evolution of stars. The detection of it would be of importance in astroparticle physics. Among all available neutrino sources, galactic supernovae give the highest neutrino flux in the MeV range. Among all liquid xenon dark matter experiments, XMASS has the largest sensitive volume and light yield. The possibility to detect galactic supernova via the CEvNS-process on xenon nuclei in the current XMASS detector was investigated. The total number of events integrated in about 18 seconds after the explosion of a supernova 10~kpc away from the Earth was expected to be from 3.5 to 21.1, depending on the supernova model used to predict the neutrino flux, while the number of background events in the same time window was measured to be negligible. All lead to very high possibility to detect CEvNS experimentally for the first time utilizing the combination of galactic supernovae and the XMASS detector. In case of a supernova explosion as close as Betelgeuse, the total observable events can be more than ten thousand, making it possible to distinguish different supernova models by examining the evolution of neutrino event rate in XMASS., Comment: 6 pages, 5 figures

Published
2017

16. J-PARC-HI Collaboration

Author

J.K. Ahn, Y. Akamatsu, M. Asakawa, S. Ashikaga, O. Busch, E. Chishiro, M. Chiu, T. Chujo, P. Cirkovic, T. Csörgő, G. David, D. Devetak, M. Djordjevic, S. Esumi, H. Fujii, K. Fukushima, P. Garg, T. Gunji, T. Hachiya, H. Hamagaki, H. Harada, M. Harada, S. Hasegawa, Y. Hashimoto, T. Hatsuda, N. Hayashi, K. Hirano, T. Hirano, B.S. Hong, H. Hotchi, S.H. Hwang, Y. Ichikawa, T. Ichisawa, K. Imai, M. Inaba, K. Ishii, K. Itakura, T. Ito, J. Kamiya, M. Kaneta, H. Kato, S. Kato, N. Kikuzawa, B.C. Kim, E.J. Kim, T. Kimura, M. Kinsho, R. Kitamura, M. Kitazawa, Y. Kondo, A. Kovalenko, H. Kuboki, Y. Kurimoto, Y. Liu, X. Luo, T. Maruyama, S. Meigo, Y. Miake, A. Miura, T. Miyao, J. Milosevic, D. Mishra, T. Morishita, K. Morita, Y. Morita, K. Moriya, K. Murase, R. Muto, L. Nadjdjerdj, S. Nagamiya, A. Nakamura, T. Nakamura, T. Nakanoya, Y. Nara, M. Naruki, K. Niki, K. Nishio, C. Nonaka, T. Nonaka, M. Ogino, H. Oguri, C. Ohmori, A. Ohnishi, M. Oka, A. Okabe, M. Okamura, K. Oyama, K. Ozawa, P.K. Saha, T.R. Saito, A. Sakaguchi, T. Sakaguchi, S. Sakai, H. Sako, K. Sato, S. Sato, Y. Sato, S. Sawada, T. Shibata, K. Shigaki, S. Shimansky, T. Shimokawa, M. Shimomura, K. Shindo, S. Shinozaki, M. Shirakata, Y. Shobuda, M. Stojanovic, K. Suganuma, H. Sugimura, Y. Sugiyama, H. Takahashi, T. Takayanagi, Y. Takeuchi, F. Tamura, H. Tamura, J. Tamura, K.H. Tanaka, Y. Tanaka, N. Tani, K. Tanida, M. Tomisawa, T. Toyama, Y. Watanabe, N. Xu, K. Yamamoto, M. Yamamoto, S. Yokkaichi, I.K. Yoo, M. Yoshii, and M. Yoshimoto

Subjects
Nuclear and High Energy Physics
Published
2021

17. Direct dark matter search by annual modulation in XMASS-I

Author

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, S. Tasaka, K. Fushimi, J. Liu, K. Martens, Y. Suzuki, B.D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, Y. Onishi, N. Oka, Y. Takeuchi, Y.H. Kim, J.S. Lee, K.B. Lee, M.K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Masuda, H. Takiya, K. Nishijima, and S. Nakamura

Subjects
Physics, Nuclear and High Energy Physics, SIMPLE (dark matter experiment), 010308 nuclear & particles physics, Dark matter, Massive particle, chemistry.chemical_element, Astrophysics, 01 natural sciences, lcsh:QC1-999, Amplitude, Xenon, chemistry, WIMP, DAMA/NaI, 0103 physical sciences, Liquid xenon, Annual modulation, 010306 general physics, Light dark matter, lcsh:Physics
Abstract

A search for dark matter was conducted by looking for an annual modulation signal due to the Earth's rotation around the Sun using XMASS, a single phase liquid xenon detector. The data used for this analysis was 359.2 live days times 832 kg of exposure accumulated between November 2013 and March 2015. When we assume Weakly Interacting Massive Particle (WIMP) dark matter elastically scattering on the target nuclei, the exclusion upper limit of the WIMP–nucleon cross section 4.3×10−41 cm2 at 8 GeV/c$^{2}$ was obtained and we exclude almost all the DAMA/LIBRA allowed region in the 6 to 16 GeV/c$^{2}$ range at ∼10$^{−40}$ cm$^{2}$. The result of a simple modulation analysis, without assuming any specific dark matter model but including electron/γ events, showed a slight negative amplitude. The p-values obtained with two independent analyses are 0.014 and 0.068 for null hypothesis, respectively. We obtained 90% C.L. upper bounds that can be used to test various models. This is the first extensive annual modulation search probing this region with an exposure comparable to DAMA/LIBRA.

Published
2016

18. Real-time supernova neutrino burst monitor at Super-Kamiokande

Author

A. T. Suzuki, J. F. Martin, T. Nakadaira, G. Carminati, Makoto Sakuda, K. Iyogi, J. L. Raaf, K. Sakashita, K. Kaneyuki, Takaaki Kajita, T. Sekiguchi, E. Kearns, R. A. Wendell, Masashi Yokoyama, Yasunari Suzuki, Y. Hayato, M. Ikeda, John Hill, S. B. Kim, J. Y. Kim, M. Goldhaber, S. N. Smith, Seiko Hirota, T. Kikawa, C. Yanagisawa, Yejin Zhang, T. Ishizuka, L. Marti, K. Tateishi, Tsuyoshi Nakaya, J. S. Jang, A. Himmel, Song Chen, K. Nishijima, W. R. Kropp, S. Tobayama, Takaaki Mori, Kate Scholberg, W. E. Keig, V. Takhistov, Atsushi Takeda, Shigeki Tasaka, E. Richard, J. L. Stone, L. R. Sulak, K. Ieki, Yusuke Suda, Hirokazu Ishino, K. S. Ganezer, R. J. Wilkes, S. Moriyama, R. Tacik, Masayuki Nakahata, I. Kametani, M. Miura, L. Labarga, T. Kobayashi, K. P. Lee, C. K. Jung, Yoshitaka Itow, J. Imber, Masato Shiozawa, Y. Choi, Koh Ueno, H.A. Tanaka, M. J. Wilking, Yasuhiro Kishimoto, A. Konaka, M. B. Smy, Kimihiro Okumura, T. Tomura, H. Okazawa, Y. Kuno, S. Nakayama, T. Yokozawa, T. Tsukamoto, C. Bronner, T. Akiri, B. L. Hartfiel, S. Mine, S. Berkman, J. G. Learned, J. Gustafson, S. Matsuno, T. McLachlan, Takehisa Hasegawa, J. Kameda, P. Fernandez, K. Connolly, P. Mijakowski, K. Choi, K. Huang, Kazuhiro Suzuki, A. Kibayashi, Y. Koshio, T. Ishida, M. Koshiba, H. K. Tanaka, M. R. Vagins, A. Murakami, A. Minamino, G. Mitsuka, I. T. Lim, P. de Perio, T. Yano, A. L. Renshaw, Kenzo Nakamura, Yuichi Oyama, R. Yamaguchi, K. Abe, Y. Totsuka, Susumu Takahashi, T. Wongjirad, Y. Takeuchi, T. Ishii, K. Martens, Y. Nishimura, C. W. Walter, N. Hong, Joshua Hignight, Hiroyuki Sekiya, Y. Fukuda, Yuuki Nakano, T. J. Irvine, Y. Haga, P. Weatherly, and H. W. Sobel

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics, Solar neutrino problem, 01 natural sciences, Cosmic neutrino background, Astrophysics - Solar and Stellar Astrophysics, Neutrino detector, 0103 physical sciences, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Super-Kamiokande, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

We present a real-time supernova neutrino burst monitor at Super-Kamiokande (SK). Detecting supernova explosions by neutrinos in real time is crucial for giving a clear picture of the explosion mechanism. Since the neutrinos are expected to come earlier than light, a fast broadcasting of the detection may give astronomers a chance to make electromagnetic radiation observations of the explosions right at the onset. The role of the monitor includes a fast announcement of the neutrino burst detection to the world and a determination of the supernova direction. We present the online neutrino burst detection system and studies of the direction determination accuracy based on simulations at SK., 15 pages, 8 figures, accepted for publication in Astroparticle Physics

Published
2016

19. Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector

Author

Y. D. Kim, Y. Takeuchi, Kentaro Miuchi, Ken-ichiro Kobayashi, H. Uchida, K.B. Lee, K. Martens, H. Takiya, Yoshitaka Itow, Yong Hamb Kim, Shigeki Tasaka, Koichi Ichimura, Katsuki Hiraide, R. Fujita, Kimiaki Masuda, Hiroyuki Sekiya, Y. Fukuda, K. Hosokawa, Y. Onishi, Motoki Kobayashi, Lee Min-Kie, Atsushi Takeda, S. Moriyama, Masayuki Nakahata, O. Takachio, K. Fujii, K. Nishijima, I. Murayama, R. Kegasa, B. S. Yang, Yasuhiro Kishimoto, Masaki Yamashita, Yoshihiro Suzuki, K. Abe, T. Norita, Jing Liu, Nam Young Kim, Kazuhiko Nakagawa, Jong-Man Lee, N. Oka, Shogo Nakamura, and H. Ogawa

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Electron capture, FOS: Physical sciences, chemistry.chemical_element, Electron, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, Neutrino, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Double electron capture, 010308 nuclear & particles physics, Detector, Instrumentation and Detectors (physics.ins-det), Lepton number, lcsh:QC1-999, MAJORANA, chemistry, High Energy Physics::Experiment, Liquid xenon, Atomic physics, lcsh:Physics, Radioactive decay
Abstract

Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on $^{124}$Xe is performed using 165.9 days of data collected with the XMASS-I liquid xenon detector. No significant excess above background was observed and we set a lower limit on the half-life as $4.7 \times 10^{21}$ years at 90% confidence level. The obtained limit has ruled out parts of some theoretical expectations. We obtain a lower limit on the $^{126}$Xe two-neutrino double electron capture half-life of $4.3 \times 10^{21}$ years at 90% confidence level as well., 6 pages, 3 figures, accepted for publication in Physics Letters B

Published
2016
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20. Reaching time resolution of less than 10 ps with plastic scintillation detectors

Author

A. Enomoto, Takayuki Yamaguchi, Lihua Zhu, Y. Takeuchi, Daisuke Nagae, Bao-Hua Sun, Satoru Terashima, S. Omika, Isao Tanihata, Akira Ozawa, T. Nishimura, and Jian-Wei Zhao

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Photomultiplier, 010308 nuclear & particles physics, business.industry, Detector, Resolution (electron density), Time resolution, Scintillator, 01 natural sciences, Time of flight, Optics, 0103 physical sciences, Electronics, 010306 general physics, business, Instrumentation
Abstract

Timing-pick up detectors with excellent timing resolutions are essential in many modern nuclear physics experiments. Aiming to develop a Time-Of-Flight system with precision down to about 10 ps, we have made a systematic study of the timing characteristic of TOF detectors, which consist of several combinations of plastic scintillators and photomultiplier tubes. With the conventional electronics, the best timing resolution of about 5.1 ps (σ) has been achieved for detectors with an area size of 3 × 1 cm 2 . It is found that for data digitalization a combination of TAC and ADC can achieve a better time resolution than the currently available TDC. Simultaneous measurements of both time and pulse height are very valuable for the correction of time-walk effect.

Published
2016

21. Recent results and future prospects of Super-Kamiokande

Author

Y. Takeuchi

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, T2K experiment, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Supernova, Upgrade, law, Kamioka Observatory, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, 010303 astronomy & astrophysics, Instrumentation
Abstract

Super-Kamiokande (SK) is a water Cherenkov detector located 1000 m underground in Kamioka Observatory , ICRR, University of Tokyo in Japan. It consists of a cylindrical stainless steel tank, 50,000 ton of purified water, and 11,000 of 20-inch PMTs. The fiducial volume of the SK detector is 22.5 kton. The experiment was started in April 1996, and currently phase IV (SK-IV) is running. SK has been the world largest water Cherenkov detector with purified water in underground since 1996. SK has a variety of measurement or physics targets, namely, solar neutrinos , atmospheric neutrinos , supernova neutrinos, neutrinos produced by the accelerator in J-PARC (as T2K experiment), and search for nucleon decay. In near future, we are going to move to the next phase, that is SK-Gd. In the SK-Gd phase, we are planning to add 0.1% of gadolinium to the current SK detector in order to enhance neutron tagging efficiency, and then try to achieve the first observation of supernova relic neutrinos (SRN) (or diffuse supernova neutrino background (DSNB)). The initial work in this upgrade project was started in June 2018. This paper reports a brief summary of the SK experiment, recent solar neutrino results, and recent atmospheric neutrino results. As a future plan, the purpose of SK-Gd and status of the upgrade work are reported.

Published
2020

23. J-PARC-HI Collaboration

Author

H. Fujii, S. Kato, Kenta Shigaki, I.K. Yoo, Ken Oyama, Masahiro Okamura, Chiho Nonaka, J. Kamiya, Masakiyo Kitazawa, Masayasu Harada, Prakhar Garg, Shoichi Hasegawa, K. Itakura, Tamás Csörgő, D. K. Mishra, L. Nadjdjerdj, Masanori Ogino, K. Sato, M. Naruki, K. Morita, K. Tanida, A. Okabe, E.J. Kim, M. Yoshimoto, Y. Watanabe, Tetsuo Hatsuda, H. Sako, F. Tamura, S. Sawada, T. Maruyama, K. Imai, Taku Gunji, Tatsuya Chujo, Yudai Ichikawa, Jovan Milosevic, X. Luo, M. Dordevic, Y. Takeuchi, Byung-Sik Hong, Predrag Cirkovic, T. Hachiya, Masayuki Asakawa, T. Ichisawa, Kyoichiro Ozawa, S. Esumi, M. Stojanovic, K. Fukushima, Motoi Inaba, Tetsufumi Hirano, H. Harada, Yasushi Nara, S. Yokkaichi, Susumu Sato, A. Kovalenko, M. Kinsho, J. Tamura, Y. Liu, Masashi Kaneta, M. Yamamoto, Aya Sakaguchi, S. Ashikaga, H. Tamura, T. Nonaka, Hideaki Hotchi, Hitoshi Sugimura, Y. Shobuda, N. Tani, A. Nakamura, Damir Devetak, S. Nagamiya, M. Chiu, Akira Ohnishi, S. Shimansky, B.C. Kim, S. Sakai, Yukinao Akamatsu, T. Nakamura, Katsuhisa Nishio, H. Kato, J.K. Ahn, Makoto Oka, K.H. Tanaka, Koichi Murase, T. Saito, Y. Tanaka, Oliver Busch, Yasuo Miake, Hideki Hamagaki, G. David, Takao Sakaguchi, S.H. Hwang, N. Xu, Maya Hachiya Shimomura, and Pranab Saha

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

XXVIIth International Conference on Ultrarelativistic Nucleus–Nucleus Collisions (Quark Matter 2018)

Published
2019

24. Spatial distributions of photons in plastic scintillator detected by multi-anode photomultiplier for heavy-ion position determination

Author

Akira Ozawa, T. Nishimura, S. Sato, K. Sawahata, Y. Takeuchi, S. Omika, D. Nishimura, Toshio Suzuki, Atsushi Kitagawa, S. Matsunaga, Mitsunori Fukuda, Takayuki Yamaguchi, and D. Nagae

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Scintillation, Photon, Optical fiber, Physics::Instrumentation and Detectors, business.industry, Biasing, Scintillator, Ion, law.invention, Optics, law, Atomic physics, business, Instrumentation, Beam (structure)
Abstract

The spatial distributions of scintillation photons in a plastic scintillation detector were measured using a multi-anode photomultiplier H7546A coupled with 1-mm-diameter optical fibers. A row of several tens of fibers connected to the scintillator generates one-dimensional spatial distributions of photons induced by the swift passage of heavy ions. The pulse heights from each channel change depending on the beam position. This can be utilized to determine the positions of the heavy ions. To test the performance of the proposed detection method, an experiment using a 84Kr beam with intermediate energies ranging from 40 to 85 MeV/nucleon was performed at the heavy-ion medical accelerator in Chiba (HIMAC). The photon spatial distributions were successfully observed. By optimizing the photomultiplier bias voltage and threshold in the pulse height analyses, a detection efficiency of 98% and a position resolution of 1.1 mm in σ were achieved simultaneously.

Published
2015

25. Micro-source development for XMASS experiment

Author

Y. Onishi, Y. D. Kim, K. Kobayashi, K. Ueshima, Y. Nishitani, K. Nishijima, Shigetaka Moriyama, H. Nishiie, H. Takiya, Yoshitaka Itow, K. Martens, Kazuhiko Nakagawa, Lee Min-Kie, Katsuki Hiraide, Hiroshi Ogawa, Jing Liu, Yong Hamb Kim, Yoshihiro Suzuki, Hiroyuki Sekiya, D. Umemoto, Kentaro Miuchi, Y. Fukuda, I. Murayama, B.S. Yang, Masayuki Nakahata, Ko Abe, Y. Takeuchi, Nam Young Kim, K. Hosokawa, K.B. Lee, Atsushi Takeda, Masaki Yamashita, N. Oka, Kimiaki Masuda, Shigeki Tasaka, K. Fujii, A. Shinozaki, K. Hieda, Yasuhiro Kishimoto, O. Takachio, Yoshihisa Otsuka, D. Motoki, A. Murata, Jong-Man Lee, F. Kusaba, S. Hirano, H. Uchida, and Shogo Nakamura

Subjects
Physics, Nuclear and High Energy Physics, Fabrication, Optics, business.industry, Detector, Dark matter, Source material, Calibration, Tube (container), business, Instrumentation
Abstract

XMASS is a multipurpose liquid-xenon detector that currently aims to directly detect dark matter. In this paper, we describe the fabrication and characterization of reference sources used for the energy calibration and position reconstruction of the present XMASS detector. Several gamma-ray sources were produced in the form of a sealed needle-source. A thin-wall tube with a diameter of approximately 0.2 mm was sealed at both ends, with the 241 Am or 57 Co source material contained inside. The active region of the source was observed to be 1–2 mm long, close to the tip of the needle. These sources were tested in the XMASS detector, and the results were compared with Monte-Carlo simulations.

Published
2015

26. Supernova Relic Neutrino search with neutron tagging at Super-Kamiokande-IV

Author

Y. Takeuchi, T.S. Tanaka, K. Nishikawa, C. Yanagisawa, A. T. Suzuki, K. Nishijima, L. R. Sulak, Hirokazu Ishino, Takaaki Kajita, J. F. Martin, Yuichi Oyama, R. A. Wendell, T. Nakadaira, P. dePerio, M. B. Smy, H. W. Sobel, Koh Ueno, Atsushi Takeda, A. Konaka, Yusuke Koshio, Makoto Sakuda, Y. Nishimura, Takaaki Mori, Shigeki Tasaka, J. L. Stone, Y. Hayato, S. Nakayama, J. L. Raaf, R. Tacik, R. Yamaguchi, K. Nakamura, I. Taylor, C. K. Jung, G. Carminati, K. Abe, A. Minamino, T. Tomura, A. Murakami, C. W. Walter, T. Yokozawa, H. Okazawa, K. Iyogi, John Hill, S. Moriyama, M. Ikeda, T. Yano, Masato Shiozawa, Y. Choi, Masayuki Nakahata, G. Mitsuka, A. L. Renshaw, T. Tsukamoto, K. Sakashita, K. P. Lee, Joshua Hignight, I. T. Lim, L. Labarga, T. Kobayashi, Hiroyuki Sekiya, K. Choi, Y. Totsuka, Susumu Takahashi, M. J. Wilking, Kimihiro Okumura, Y. Fukuda, K. Kaneyuki, T. Wongjirad, M. Koshiba, T. Ishida, M. Vagins, M. Goldhaber, T. Sekiguchi, W. E. Keig, S. Matsuno, Yejin Zhang, K. Bays, H. Kaji, H. Sui, Song Chen, J. Kameda, Yuuki Nakano, S. N. Smith, Yoshitaka Itow, Yasunari Suzuki, Y. Kuno, P. Mijakowski, H. Kikawa, J. G. Learned, W. R. Kropp, S. Tobayama, Zishuo Yang, Kate Scholberg, M. Dziomba, Kazuhiro Suzuki, H. Zhang, T. McLachlan, Ll. Marti, E. Kearns, S. Barkman, K. Martens, S. Mine, K. S. Ganezer, Masashi Yokoyama, S. B. Kim, J. Y. Kim, K. Huang, A. Kibayashi, K. Ieki, R. J. Wilkes, T. Ishii, T. Ishizuka, Tsuyoshi Nakaya, T. Akiri, T. Hasegawa, Yasuhiro Kishimoto, Y. Takenaga, M. Miura, J. S. Jang, K. Connolly, and J. Imber

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Photon energy, High Energy Physics - Experiment, Nuclear physics, Supernova, Neutron capture, Neutron, High Energy Physics::Experiment, Experimental methods, Neutrino, Super-Kamiokande, Nuclear Experiment, Charged current
Abstract

A search for Supernova Relic Neutrinos $\bar{\nu}_e$'s is first conducted via inverse-beta-decay by tagging neutron capture on hydrogen at Super-Kamiokande-IV. The neutron tagging efficiency is determined to be $(17.74\pm0.04_{stat.}\pm1.05_{sys.})%$, while the corresponding accidental background probability is $(1.06\pm0.01_{stat.}\pm 0.18_{sys.})$%. Using 960 days of data, we obtain 13 inverse-beta-decay candidates in the range of $E_{\bar{\nu}_e}$ between 13.3 MeV and 31.3 MeV. All of the observed candidates are attributed to background. Upper limits at 90% C.L. are calculated in the absence of a signal., Comment: 6 pages, 4 figures

Published
2015
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27. Antibiotic susceptibility and resistance of Staphylococcus aureus isolated from fresh porcine skin xenografts: Risk to recipients with thermal injury

Author

Stacey-Ann Busby, Pavel Vesely, Linda Scobie, Y Takeuchi, Sue Lang, and Andrew Robb

Subjects
Methicillin-Resistant Staphylococcus aureus, Staphylococcus aureus, Veterinary medicine, Swine, medicine.drug_class, Antibiotics, Microbial Sensitivity Tests, Tigecycline, Nose, Perineum, Critical Care and Intensive Care Medicine, medicine.disease_cause, Microbiology, Antibiotic resistance, Drug Resistance, Bacterial, medicine, Animals, Humans, Skin, Biological Dressings, business.industry, Chloramphenicol, General Medicine, biochemical phenomena, metabolism, and nutrition, bacterial infections and mycoses, Methicillin-resistant Staphylococcus aureus, Anti-Bacterial Agents, Nitrofurantoin, Streptomycin, Emergency Medicine, Vancomycin, Surgery, Burns, business, medicine.drug
Abstract

The previous use of fresh porcine xenografts at the Prague Burn Centre had raised concerns over the transmission of zoonotic pathogens. This study examines the risk of zoonotic Staphylococcus aureus colonisation of burn patients from fresh porcine skin xenografts. Samples were collected from the nares, skin and perineum of commercial pigs (n=101) and were screened for methicillin sensitive S. aureus (MSSA) and resistant S. aureus (MRSA). The efficacy of the antibiotic wash used in decontamination of the pigskin was tested against planktonic- and biofilm-grown isolates. The spa type of each isolate was also confirmed. All pig swabs were negative for MRSA but 86% positive for MSSA. All planktonic-grown isolates of MSSA were sensitive to chloramphenicol and nitrofurantoin and 44% of isolates were resistant to streptomycin. Isolates grown as biofilm exhibited higher rates of antimicrobial resistance. Sequence analysis revealed three distinct spa types of the MRSA ST398 clonal type. This finding demonstrates the existence of a MSSA reservoir containing spa types resembling those of well-known MRSA strains. These MSSA exhibit resistance to antibiotics used for decontamination of the pigskin prior to xenograft. Amended use of procurement could allow the use of fresh pigskin xenografts to be reinstated.

Published
2014

29. W-boson polarization measurement in the tt¯ dilepton channel using the CDF II detector

Author

G. Velev, D. Krop, P. Totaro, A. Barbaro-Galtieri, D. Amidei, A. T. Goshaw, P. Mastrandrea, A. Mazzacane, M. Iori, T. Kuhr, W. K. Sakumoto, V. Ramakrishnan, M. N. Mondragon, G. Manca, J. Lueck, Frank Chlebana, Y. Takeuchi, D. E. Pellett, Mario Campanelli, S. Amerio, Christoph Paus, C. Grosso-Pilcher, Paolo Maestro, S. Y. Jun, N. Goldschmidt, Giovanni Bellettini, Aidan Robson, D. P. Benjamin, S. R. Hou, S. Errede, Yasuyoshi Nagai, Francesco Crescioli, I. Oksuzian, V. Saveliev, Stephan Lammel, Lucio Cerrito, E. J. Jeon, W. Ketchum, M. E. Mattson, T. Tomura, S. Pagan Griso, Tetsuo Arisawa, C. Neu, M. I. Martínez, D. J. Cox, A. Di Canto, P. Giannetti, R. Madrak, J. Naganoma, Eva Halkiadakis, T. Miao, Antonio Limosani, D. Chokheli, Y. Kato, Virgil E Barnes, B. Jayatilaka, Kenichi Hatakeyama, Alexander Paramonov, M. Franklin, M. Jones, J. Morlock, J. Guimaraes Da Costa, D. Tonelli, D. Horn, C. Pagliarone, Robin Erbacher, M. Datta, W-M. Yao, K. Gibson, T. Wright, T. Aaltonen, Manfred Paulini, Julia Thom, Lorenzo Santi, A. Eppig, N. Moggi, Xin Wu, Paul Lujan, K. Takemasa, Justin Pilot, I. V. Gorelov, Zhenbin Wu, F. Canelli, E. Thomson, J. C. Freeman, Stanislav Tokár, M. Heck, Peter Wagner, Chuan-Ming Liu, C. M. Ginsburg, W. C. Wester, A. G. Clark, Jian Tang, P. F. Shepard, S. H. Oh, F. Vázquez, A. Ruiz, S. H. Kim, Javier Cuevas, S. Uozumi, G. Punzi, F. Wick, A. Scribano, S. Torre, Roger Moore, D. O. Litvintsev, Adrian Buzatu, P. Murat, Matteo Bauce, M. E. Convery, R. Carosi, Tara Shears, D. Goldin, M. M. Deninno, A. Hocker, G. Chlachidze, S. Leo, P. Catastini, Guido Volpi, A. Anastassov, C. S. Moon, J. C. Yun, K. Yi, Aron Soha, M. Cordelli, G. Busetto, Brian L Winer, F. Margaroli, C. Bromberg, Oliver Stelzer-Chilton, A. Mitra, Maxwell Chertok, L. Nodulman, O. González, Elliot Lipeles, Yongsun Kim, Azeddine Kasmi, J. Asaadi, Mark Kruse, Alison Lister, N. Ranjan, P. Barria, E. James, Naoki Kimura, H. S. Budd, Y. D. Oh, R. McNulty, M. Hare, S. Donati, M. Tecchio, Massimo Casarsa, G. Flanagan, W. H. Hopkins, Itsuo Nakano, Hongfang Liu, Gianluca Introzzi, Sebastian Grinstein, Amitabh Lath, Alan Garfinkel, E. Palencia, M. Corbo, B. A. Barnett, Th. Müller, Giorgio Apollinari, I. Bizjak, J. Vizán, F. D. Snider, J. Y. Han, Giorgio Chiarelli, Sally Seidel, J. Lys, R. Roser, Ivan Vila, K. Knoepfel, J. Conway, E. Lee, Viviana Cavaliere, A. Varganov, C. Calancha, P. McIntyre, K. Sliwa, A. Simonenko, A. Mukherjee, V. Papadimitriou, S. Klimenko, Jacobo Konigsberg, P. B. Renton, S. S. Yu, G. Latino, S. Wolbers, N. Hussain, L. Brigliadori, A. T. Laasanen, A. Aurisano, D. Waters, Keunchang Cho, C. P. Marino, R. Forrest, S. Moed, Teruki Kamon, Y. Zeng, Andrew Beretvas, J. S. Wilson, Markus Frank, N. Giokaris, T. Riddick, R. Culbertson, O. Norniella, Jason Nielsen, Michael Joseph Morello, Sandra Leone, S. W. Lee, S. Zucchelli, Stefano Camarda, J. S. H. Lee, A. Schmidt, G. Compostella, Maria Agnese Ciocci, P. Garosi, J. Strologas, R. F. Harr, P. Sinervo, H. Gerberich, Joe Kroll, R. St. Denis, I. Suslov, Luca Scodellaro, J. Keung, D. Torretta, A. Sukhanov, C. Mesropian, A. Semenov, S. Y. Noh, Kaori Maeshima, S. Hewamanage, Sinead Farrington, Thomas LeCompte, D. Yamato, H. S. Lee, Daniel Whiteson, J. P. Fernandez, F. Ruffini, M. Lindgren, B. Auerbach, G. P. Yeh, S. Carrillo, Koji Sato, A. Napier, C. A. Cox, F. Bedeschi, F. Sforza, Mark Neubauer, Andrea Bocci, Tommaso Dorigo, Teresa Rodrigo, R. Orava, D. Lucchesi, Bernd Stelzer, Tomoko Yoshida, S. Poprocki, M. Dorigo, Y. Sakurai, R. Vilar, M. Stancari, Kevin Lannon, J. N. Bellinger, A. Golossanov, M. dʼErrico, K. S. McFarland, P. J. Bussey, K. R. Bland, Y. Funakoshi, L. Oakes, Jane Nachtman, T. J. Phillips, K. Kondo, A. Pranko, G. Lungu, T. Yang, M. Trovato, R. D. Field, Alessandro Cerri, F. Ptohos, A. Elagin, Jay Dittmann, D. Cauz, Fumihiko Ukegawa, P. Wilson, Michele Gallinaro, J. E. Garcia, D. Hare, M. Kurata, Guillelmo Gomez-Ceballos, J. Antos, I. K. Furic, S. Kwang, J. A. Appel, L. Ortolan, D. H. Kim, M. Hurwitz, A. Boveia, S. R. Hahn, Chen Zhou, Andrew Ivanov, Peter Wittich, M. DellʼOrso, Ignacio Redondo, Hyun-Chul Kim, L. Pondrom, E. Wicklund, Kevin Burkett, G. Pauletta, A. Loginov, A. B. Wicklund, K. Tollefson, K. K. Joo, Yi Chen, P. Squillacioti, Kazuhiko Hara, J. Patrick, Daniela Bortoletto, P. E. Karchin, D. W. Jang, Erik Brücken, M. Mussini, Jochen Jens Heinrich, Y. C. Yang, Christopher Clarke, Fedor Prokoshin, G. A. Thompson, K. T. Pitts, E. E. Schmidt, N. Ershaidat, Q. Liu, S. Lami, Matteo Cavalli-Sforza, D. Stentz, D. Dagenhart, Elisabetta Pianori, A. V. Kotwal, I. Yu, T. Okusawa, I. Shreyber-Tecker, E. Rogers, Thomas Schwarz, M. Campbell, W. H. Chung, Song-Ming Wang, F. Azfar, Ricardo Eusebi, Gervasio Gomez, J. Huston, Y. S. Chung, Aurore Savoy-Navarro, K. Matera, A. Penzo, A. Artikov, Michal Kreps, G. Piacentino, P. Mehtala, F. Devoto, S. Carron, Pavol Bartos, E. Gerchtein, M. J. Kim, Duncan Carlsmith, Rainer Wallny, T. R. Junk, J. Yoh, B. Casal, G. L. Strycker, M. J. Shochet, Matthew Herndon, V. V. Glagolev, G. Giurgiu, Koji Yamamoto, A. Manousakis-Katsikakis, P. K. Teng, M. Hussein, S. Rolli, Benjamin Kilminster, W. Ashmanskas, S. Lockwitz, Sudhir Malik, Barry Blumenfeld, V. Rusu, M. Lancaster, M. Gold, Maria Rescigno, H. Wolfe, P. Movilla Fernandez, B. Di Ruzza, Chi Lin, P. Mazzanti, J. R. Smith, G. B. Yu, Shalhout Shalhout, Hao Song, S. Behari, J. Boudreau, K. Ebina, Young-Jin Kim, T. Wakisaka, N. dʼAscenzo, Maxim Goncharov, A. Hamaguchi, D. Mietlicki, Vyacheslav Krutelyov, R. L. Wagner, L. Demortier, K. Goulianos, P. N. Dong, T. Bae, S. B. Kim, P. de Barbaro, D. Toback, W. Badgett, M. Shimojima, Andreas Warburton, H. H. Williams, Andrea Castro, U. Husemann, B. Álvarez González, A. M. Zanetti, K. Potamianos, Sergo Jindariani, J. Budagov, R. L. Lander, D. J. Kong, B. Carls, V. Sorin, P. Lukens, Franco Rimondi, Y. Sudo, Chris Hays, M. Kirby, Marcelo Vogel, C. Plager, J. Nett, Stefano Giagu, Alexei Safonov, J. D. Lewis, Alberto Annovi, V. Khotilovich, Y. Seiya, J. E. Kim, R. E. Hughes, T. Rodriguez, Fabrizio Scuri, V. A. Giakoumopoulou, A. Rahaman, Luciano Ristori, Tiehui Liu, U. K. Yang, H. Miyake, F. Happacher, Dario Bisello, A. Bhatti, Ankita Mehta, Roman Lysak, M. Vidal, S. Wilbur, Aristotle Calamba, C. Vellidis, P. Giromini, Arie Bodek, M. Feindt, P. Schlabach, James Russ, Kohei Yorita, D. Glenzinski, J. Thome, and M. DʼOnofrio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Detector, Tevatron, Astrophysics::Cosmology and Extragalactic Astrophysics, Polarization (waves), 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, 010306 general physics, Boson, Lepton
Abstract

We present a measurement of W boson polarization in top-quark decays in t{bar t} events with decays to dilepton final states using 5.1 fb{sup -1} integrated luminosity in p{bar p} collisions collected by the CDF II detector at the Tevatron. A simultaneous measurement of the fractions of longitudinal (f{sub 0}) and right-handed (f{sub +}) W bosons yields the results f{sub 0} = 0.71{sub -0.17}{sup +0.18}(stat) {+-} 0.06(syst) and f{sub +} = -0.07 {+-} 0.09(stat) {+-} 0.03(syst). Combining this measurement with our previous result based on single lepton final states, we obtain f{sub 0} = 0.84 {+-} 0.09(stat) {+-} 0.05(syst) and f{sub +} = -0.16 {+-} 0.05(stat) {+-} 0.04(syst). The results are consistent with standard model expectation.

Published
2013

30. Search for a Higgs boson in the diphoton final state using the full CDF data set from pp¯ collisions at s=1.96 TeV

Author

Andrea Castro, U. Husemann, B. Álvarez González, A. M. Zanetti, W. Badgett, M. Shimojima, Andreas Warburton, Shalhout Shalhout, S. Behari, J. Boudreau, K. Takemasa, G. Velev, M. Cordelli, G. Busetto, Brian L Winer, P. Totaro, Maxim Goncharov, F. Vázquez, N. Moggi, Chuan-Ming Liu, Rainer Wallny, N. Ranjan, T. Kuhr, G. P. Yeh, A. Napier, B. Casal, Giovanni Bellettini, Ivan-Kresimir Furic, Y. D. Oh, Teresa Rodrigo, G. Punzi, K. Kondo, Hongfang Liu, DongHee Kim, J. A. Appel, Mario Campanelli, G. Pauletta, S. Amerio, Y. Funakoshi, T. J. Phillips, Christoph Paus, M. Trovato, Azeddine Kasmi, D. W. Jang, J. D. Lewis, H. S. Budd, G. Giurgiu, A. Simonenko, S. Zucchelli, Alberto Annovi, F. Rimondi, D. J. Cox, A. Di Canto, S. Y. Jun, D. Hare, J. Morlock, Peter Wagner, W. H. Chung, V. Papadimitriou, V. Khotilovich, V. Rusu, A. Mukherjee, M. Lancaster, Y. Seiya, H. Wolfe, B. Jayatilaka, M. M. Deninno, Andrew Beretvas, Michael Joseph Morello, Sandra Leone, Andrea Bocci, Tommaso Dorigo, M. Campbell, Y. S. Chung, I. Yu, Y. Takeuchi, Antonio Limosani, R. E. Hughes, T. Rodriguez, R. McNulty, M. Hare, R. Vilar, Fabrizio Scuri, M. Tecchio, K. Knoepfel, K. Cho, A. Varganov, Robin Erbacher, M. Datta, W-M. Yao, M. Heck, Taegil Bae, A. Scribano, Hao Song, I. Oksuzian, J. Lys, R. Roser, Ivan Vila, O. Stelzer-Chilton, V. Saveliev, M. Lindgren, V. A. Giakoumopoulou, S. Torre, Tomoko Yoshida, W. Ketchum, P. Mastrandrea, A. Mitra, D. Waters, Yang Yang, Chris Hays, M. Kirby, Jason Nielsen, Maxwell Chertok, S. W. Lee, M. Iori, D. Mietlicki, M. DellʼOrso, Marcelo Vogel, R. St. Denis, G. Flanagan, I. Bizjak, J. Vizán, J. Conway, E. Lee, Viviana Cavaliere, K. Ebina, K. Tollefson, S. Lami, W. C. Wester, B. Auerbach, S. Carrillo, C. Plager, L. Demortier, P. N. Dong, J. Nett, Thomas LeCompte, Stefano Giagu, Luca Scodellaro, C. P. Marino, S. Moed, T. Wakisaka, Elisabetta Pianori, A. V. Kotwal, J. P. Fernandez, I. Shreyber-Tecker, Roger Moore, D. O. Litvintsev, N. dʼAscenzo, A. Hamaguchi, Thomas Schwarz, J. Strologas, P. Sinervo, Stephan Lammel, Koji Sato, Lucio Cerrito, A. Mazzacane, P. B. Renton, S. S. Yu, P. Murat, M. Dorigo, L. Pondrom, E. Wicklund, M. N. Mondragon, Alexei Safonov, J. Lueck, L. Nodulman, Y. Zeng, Fumihiko Ukegawa, D. E. Pellett, M. E. Mattson, L. Oakes, B. Carls, V. Sorin, P. Lukens, Jane Nachtman, V. Ramakrishnan, T. Tomura, S. Pagan Griso, A. Loginov, A. B. Wicklund, S. Donati, F. D. Snider, A. Pranko, Erik Brücken, Kenichi Hatakeyama, Alexander Paramonov, M. Franklin, J. Patrick, Virgil E Barnes, J. Y. Han, E. E. Schmidt, Aidan Robson, D. P. Benjamin, F. Sforza, D. Stentz, D. Dagenhart, S. Wolbers, M. Gold, Lorenzo Santi, Maria Rescigno, A. Eppig, M. Martinez, P. Movilla Fernandez, J. Keung, Y. Sudo, J. C. Freeman, A. Ruiz, C.S. Moon, D. Torretta, A. Sukhanov, Y. Sakurai, G. L. Strycker, Ignacio Redondo, Hyun-Chul Kim, Giuseppe Latino, Y. Kato, B. Di Ruzza, M. J. Shochet, K. Matera, T. Wright, C. Mesropian, J. Guimaraes Da Costa, D. Tonelli, K. Yi, Chi Lin, K. T. Pitts, A. Semenov, H. H. Williams, A. T. Laasanen, I. V. Gorelov, Zhenbin Wu, Seo-Young Noh, P. Mazzanti, J. R. Smith, G. B. Yu, N. Ershaidat, Q. Liu, T. Aaltonen, Young-Jin Kim, Jochen Jens Heinrich, M. E. Convery, K. Potamianos, Michal Kreps, Sergo Jindariani, J. Budagov, Gianluca Introzzi, Roman Lysak, Tetsuo Arisawa, C. Neu, G. A. Thompson, R. L. Lander, M. Jones, Jieun Kim, Jacobo Konigsberg, Aron Soha, M. Vidal, E. Rogers, S. Wilbur, F. Devoto, Song-Ming Wang, S. Carron, M. J. Kim, Duncan Carlsmith, Vyacheslav Krutelyov, Julia Thom, Stefano Camarda, Aristotle Calamba, Sally Seidel, F. Azfar, Koji Yamamoto, A. Manousakis-Katsikakis, P. K. Teng, C. Vellidis, Aurore Savoy-Navarro, P. Giromini, Daniel Whiteson, F. Ruffini, Kevin Lannon, R. F. Harr, M. Feindt, P. Schlabach, W. Ashmanskas, S. Lockwitz, Sudhir Malik, Guillelmo Gomez-Ceballos, J. Antos, L. Ortolan, Manfred Paulini, P. Garosi, M. Mussini, James Russ, A. Boveia, Kohei Yorita, D. Glenzinski, Christopher Clarke, J. Thome, A. Rahaman, M. Kurata, Andrew Ivanov, P. J. Bussey, Luciano Ristori, Tiehui Liu, U. K. Yang, H. Miyake, J. N. Bellinger, M. dʼErrico, F. Happacher, Dario Bisello, A. Bhatti, Ankita Mehta, Ricardo Eusebi, Elliot Lipeles, Daniela Bortoletto, P. E. Karchin, J. C. Yun, F. Margaroli, Kevin Burkett, Yongsun Kim, A. Aurisano, J. S. Wilson, N. Giokaris, A. Schmidt, G. Compostella, Maria Agnese Ciocci, R. L. Wagner, Satoru Uozumi, S. Kim, K. Goulianos, M. Corbo, Y. C. Chen, G. Piacentino, Giorgio Chiarelli, P. de Barbaro, D. Toback, T. Miao, D. Chokheli, D. Krop, D. Amidei, K. Gibson, A. T. Goshaw, Xin Wu, F. Canelli, E. Thomson, M. DʼOnofrio, Matteo Bauce, Tara Shears, D. J. Kong, A. Barbaro-Galtieri, N. Hussain, Kyung Kwang Joo, W. K. Sakumoto, S. R. Hou, S. Errede, Yasuyoshi Nagai, Francesco Crescioli, R. Madrak, C. Grosso-Pilcher, N. Goldschmidt, J. Naganoma, E. J. Jeon, Eva Halkiadakis, C. M. Ginsburg, D. Goldin, J. Asaadi, P. Barria, E. James, Naoki Kimura, P. F. Shepard, S. H. Oh, Guido Volpi, O. González, Itsuo Nakano, G. Manca, Alan Garfinkel, P. McIntyre, R. Forrest, Markus Frank, T. Riddick, H. Gerberich, Mark Neubauer, R. Orava, L. Brigliadori, G. Lungu, R. D. Field, Paolo Maestro, Joe Kroll, Frank Chlebana, P. Giannetti, B. Stelzer, K. S. McFarland, K. R. Bland, Paul Lujan, F. Ptohos, A. Elagin, S. Kwang, M. Hurwitz, S. R. Hahn, T. Yang, Chen Zhou, F. Wick, Jay Dittmann, D. Cauz, A. Artikov, P. Catastini, C. Bromberg, Matthew Herndon, Massimo Casarsa, W. H. Hopkins, M. Hussein, S. Rolli, Benjamin Kilminster, Jongmin Lee, C. Calancha, Barry Blumenfeld, I. Suslov, S. Hewamanage, Sinead Farrington, Michele Gallinaro, Peter Wittich, R. Culbertson, O. Norniella, S. Poprocki, A. Bodek, C. A. Cox, F. Bedeschi, M. Stancari, Justin Pilot, A. Golossanov, Alessandro Cerri, A. G. Clark, R. Carosi, A. Hocker, P. Squillacioti, Kazuhiko Hara, S. Leo, Fedor Prokoshin, Mark Kruse, Alison Lister, T. Okusawa, A. Buzatu, Sebastian Grinstein, Amitabh Lath, J. Huston, C. Pagliarone, Stanislav Tokár, D. Horn, E. Palencia, B. A. Barnett, Giorgio Apollinari, Jian Tang, Teruki Kamon, S. H. Kim, Javier Cuevas, G. Chlachidze, A. Anastassov, D. Yamato, D. Lucchesi, Kaori Maeshima, H. S. Lee, Th. Müller, K. Sliwa, S. Klimenko, P. Wilson, J. E. Garcia, Pavol Bartos, Matteo Cavalli-Sforza, V. V. Glagolev, Gervasio Gomez, A. Penzo, P. Mehtala, E. Gerchtein, T. R. Junk, and J. Yoh

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Context (language use), Fermion, 01 natural sciences, Resonance (particle physics), Standard Model, Nuclear physics, 0103 physical sciences, Higgs boson, Mass spectrum, High Energy Physics::Experiment, 010306 general physics
Abstract

A search for a narrow Higgs boson resonance in the diphoton mass spectrum is presented based on data corresponding to 10 fb − 1 of integrated luminosity collected by the CDF experiment from proton–antiproton collisions at s = 1.96 TeV . To increase the sensitivity of the search, we employ a multivariate discriminant technique for the first time in this channel at CDF. No evidence of signal is observed, and upper limits are set on the cross section times branching ratio of the resonant state as a function of the Higgs boson mass. The limits are interpreted in the context of the standard model with an expected (observed) limit on the cross section times branching ratio of 9.9 (17.0) times the standard model prediction at the 95% credibility level for a Higgs boson mass of 125 GeV / c 2 . Moreover, a Higgs boson with suppressed couplings to fermions is excluded for masses below 114 GeV / c 2 at the 95% credibility level.

Published
2012

31. Search for the standard model Higgs boson produced in association with a Z boson in 7.9 fb−1 of pp¯ collisions at s=1.96 TeV using the CDF II detector

Author

J. D. Lewis, Roger Moore, D. O. Litvintsev, C. S. Moon, M. Cordelli, P. Mastrandrea, G. Busetto, Brian L Winer, M. Iori, Alberto Annovi, Elliot Lipeles, S. Donati, V. Khotilovich, M. Feindt, P. Schlabach, Y. Seiya, Y. D. Oh, Kenichi Hatakeyama, Alexander Paramonov, M. Franklin, J. E. Kim, R. E. Hughes, A. T. Laasanen, T. Rodriguez, P. Garosi, J. N. Bellinger, M. dʼErrico, H. S. Kim, G. Flanagan, J. Conway, E. Lee, Viviana Cavaliere, Kevin Burkett, A. Eppig, A. Scribano, D. Horn, Sally Seidel, S. Torre, A. Aurisano, J. S. Wilson, N. Giokaris, Jochen Jens Heinrich, Fabrizio Scuri, S. Moed, J. C. Freeman, A. Ruiz, A. Mitra, G. Giurgiu, N. Moggi, P. Movilla Fernandez, A. Schmidt, G. Compostella, C. M. Ginsburg, L. Oakes, Jian Tang, S. H. Kim, Javier Cuevas, S. Zucchelli, F. Rimondi, V. Ramakrishnan, Maria Agnese Ciocci, Chuan-Ming Liu, Y. Takeuchi, Virgil E Barnes, M. Kurata, Andrew Ivanov, B. Di Ruzza, G. Punzi, V. A. Giakoumopoulou, G. A. Thompson, E. Rogers, Aurore Savoy-Navarro, James Russ, Kohei Yorita, D. Glenzinski, J. Thome, Jane Nachtman, G. Chlachidze, A. Anastassov, K. Matera, Maxwell Chertok, Giuseppe Latino, K. Kondo, K. Yi, Aidan Robson, P. Murat, A. Boveia, D. P. Benjamin, I. Oksuzian, A. Pranko, Joe Kroll, Daniela Bortoletto, P. E. Karchin, T. Wright, Roman Lysak, M. Vidal, S. Wilbur, J. A. Appel, T. Aaltonen, Th. Müller, Chris Hays, M. E. Convery, Ignacio Redondo, Azeddine Kasmi, I. Bizjak, D. Hare, J. Vizán, Chi Lin, G. Pauletta, D. W. Jang, M. Kirby, Marcelo Vogel, Y. Kato, J. Guimaraes Da Costa, K. Sliwa, S. Klimenko, P. Mazzanti, J. R. Smith, G. B. Yu, Aron Soha, P. F. Shepard, S. H. Oh, G. Velev, P. Totaro, I. Yu, W. H. Chung, D. Mietlicki, D. Tonelli, Christopher Clarke, V. Saveliev, W. Ketchum, J. Lys, P. Squillacioti, Kazuhiko Hara, L. Demortier, C. P. Marino, Aristotle Calamba, P. Giromini, S. Y. Jun, M. Campbell, K. S. McFarland, K. R. Bland, T. Yang, P. N. Dong, V. Rusu, M. Lancaster, L. Nodulman, Michal Kreps, R. Roser, Ivan Vila, M. Gold, M. J. Morello, F. D. Snider, Kevin Lannon, Jason Nielsen, C. Plager, J. Nett, Stefano Giagu, I. V. Gorelov, Zhenbin Wu, Guillelmo Gomez-Ceballos, J. Antos, K. T. Pitts, J. Y. Han, L. Brigliadori, N. Ershaidat, Q. Liu, Pavol Bartos, L. Ortolan, Stephan Lammel, Lucio Cerrito, S. Wolbers, Antonio Limosani, H. Wolfe, S. W. Lee, Y. S. Chung, J. Strologas, G. Piacentino, K. K. Joo, W. Badgett, Maria Rescigno, Fedor Prokoshin, Matteo Bauce, Tara Shears, P. Sinervo, Mario Campanelli, A. Mazzacane, Robin Erbacher, M. Datta, D. Goldin, R. St. Denis, A. Rahaman, M. Mussini, T. Kuhr, W. C. Wester, Thomas LeCompte, M. DellʼOrso, M. N. Mondragon, T. Okusawa, Song-Ming Wang, Alexei Safonov, Keunchang Cho, S. Amerio, Christoph Paus, W-M. Yao, E. J. Jeon, Guido Volpi, O. González, C. Vellidis, F. Ptohos, A. Elagin, Itsuo Nakano, M. Shimojima, Giovanni Bellettini, J. Asaadi, M. Heck, J. Lueck, Peter Wagner, F. Azfar, Ivan-Kresimir Furic, P. Barria, E. James, Naoki Kimura, J. Huston, F. Devoto, V. V. Glagolev, B. Auerbach, J. P. Fernandez, S. Carron, S. Carrillo, M. M. Deninno, D. J. Cox, A. Di Canto, M. E. Mattson, Luciano Ristori, J. Patrick, J. Keung, D. Torretta, A. Sukhanov, Tiehui Liu, M. Lindgren, M. J. Kim, Ricardo Eusebi, D. J. Kong, Duncan Carlsmith, K. Tollefson, D. E. Pellett, T. Tomura, Shalhout Shalhout, B. Carls, S. Lami, Jay Dittmann, D. Cauz, Alan Garfinkel, P. McIntyre, U. K. Yang, H. Miyake, Tomoko Yoshida, Hongfang Liu, V. Sorin, Andreas Warburton, S. Pagan Griso, P. Lukens, F. Happacher, C. Pagliarone, S. Behari, J. Boudreau, Manfred Paulini, Tetsuo Arisawa, C. Neu, Elisabetta Pianori, P. B. Renton, C. Mesropian, B. Jayatilaka, L. Pondrom, E. Wicklund, Dario Bisello, A. Bhatti, Massimo Casarsa, W. H. Hopkins, M. Jones, R. Forrest, A. V. Kotwal, J. Morlock, A. Simonenko, J. S. H. Lee, Stanislav Tokár, Adrian Buzatu, R. McNulty, M. Hare, I. Shreyber-Tecker, Michele Gallinaro, M. Tecchio, K. Knoepfel, Maxim Goncharov, S. Uozumi, Peter Wittich, S. S. Yu, V. Papadimitriou, K. Takemasa, Thomas Schwarz, Vyacheslav Krutelyov, Y. Zeng, M. Martinez, A. Varganov, I. Suslov, Julia Thom, A. Semenov, S. Y. Noh, J. C. Yun, Hao Song, F. Vázquez, C. Calancha, R. F. Harr, S. Hewamanage, Sinead Farrington, Y. Sudo, F. Margaroli, Oliver Stelzer-Chilton, D. Krop, D. Amidei, A. T. Goshaw, Andrew Beretvas, Sandra Leone, S. Poprocki, Yongsun Kim, A. Bodek, G. P. Yeh, N. Ranjan, T. Miao, D. Chokheli, R. L. Wagner, Rainer Wallny, M. Stancari, M. Corbo, Y. C. Chen, Gianluca Introzzi, A. Golossanov, Markus Frank, T. Riddick, S. R. Hou, B. Casal, K. Goulianos, A. Napier, Alessandro Cerri, F. Sforza, Teresa Rodrigo, P. J. Bussey, Giorgio Chiarelli, Y. Sakurai, D. Yamato, D. Lucchesi, Bernd Stelzer, H. Gerberich, K. Gibson, D. Waters, Y. Funakoshi, T. J. Phillips, K. Ebina, Andrew Mehta, Jacobo Konigsberg, S. Errede, Yasuyoshi Nagai, Francesco Crescioli, Fumihiko Ukegawa, Young-Jin Kim, T. Wakisaka, R. Madrak, J. Naganoma, Eva Halkiadakis, G. L. Strycker, Xin Wu, N. Hussain, N. dʼAscenzo, A. Hamaguchi, A. Loginov, M. J. Shochet, R. Culbertson, Mark Neubauer, Luca Scodellaro, P. de Barbaro, R. Orava, O. Norniella, A. B. Wicklund, Koji Sato, Erik Brücken, Stefano Camarda, Justin Pilot, M. Dorigo, F. Canelli, D. Toback, E. Thomson, Daniel Whiteson, E. E. Schmidt, T. Bae, D. Stentz, D. Dagenhart, F. Ruffini, A. G. Clark, G. Lungu, R. Carosi, A. Hocker, S. Leo, Mark Kruse, Alison Lister, R. D. Field, C. A. Cox, M. DʼOnofrio, F. Bedeschi, Paul Tipton, Sebastian Grinstein, S. B. Kim, Koji Yamamoto, A. Manousakis-Katsikakis, P. K. Teng, W. Ashmanskas, S. Lockwitz, Sudhir Malik, Marco Trovato, Paul Lujan, W. K. Sakumoto, Andrea Castro, F. Wick, C. Grosso-Pilcher, U. Husemann, N. Goldschmidt, B. Álvarez González, P. Catastini, C. Bromberg, A. M. Zanetti, A. Barbaro-Galtieri, G. Manca, Paolo Maestro, H. S. Budd, A. Mukherjee, Andrea Bocci, Tommaso Dorigo, R. Vilar, Y. C. Yang, P. Mehtala, E. Gerchtein, T. R. Junk, J. Yoh, Gervasio Gomez, H. H. Williams, K. Potamianos, Sergo Jindariani, L. Santi, Amitabh Lath, J. Budagov, A. Penzo, E. Palencia, B. A. Barnett, Giorgio Apollinari, S. Kwang, D. H. Kim, M. Hurwitz, S. R. Hahn, Teruki Kamon, Chen Zhou, R. L. Lander, Kaori Maeshima, H. S. Lee, A. Artikov, Matthew Herndon, M. Hussein, S. Rolli, Benjamin Kilminster, P. Wilson, J. E. Garcia, Barry Blumenfeld, Matteo Cavalli-Sforza, Frank Chlebana, and P. Giannetti

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Detector, 01 natural sciences, Standard Model, Nuclear physics, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Production (computer science), Sensitivity (control systems), 010306 general physics, Lepton, Boson
Abstract

We present a search for the standard model Higgs boson produced in association with a Z boson, using up to 7.9 fb{sup -1} of integrated luminosity from p{bar p} collisions collected with the CDF II detector. We utilize several novel techniques, including multivariate lepton selection, multivariate trigger parametrization, and a multi-stage signal discriminant consisting of specialized functions trained to distinguish individual backgrounds. By increasing acceptance and enhancing signal discrimination, these techniques have significantly improved the sensitivity of the analysis above what was expected from a larger dataset alone. We observe no significant evidence for a signal, and we set limits on the ZH production cross section. For a Higgs boson with mass 115 GeV/c{sup 2}, we expect (observe) a limit of 3.9 (4.8) times the standard model predicted value, at the 95% credibility level.

Published
2012

32. An additional study of multi-muon events produced in pp¯ collisions at s=1.96 TeV

Author

Y. Takeuchi, I. Oksuzian, V. Saveliev, M. Jones, Massimo Casarsa, W. Ketchum, Yang Yang, S. Donati, Kenichi Hatakeyama, W. H. Hopkins, Jongmin Lee, M. Franklin, Julia Thom, R. L. Wagner, C. Calancha, K. Goulianos, S. Tkaczyk, A. Eppig, J. C. Freeman, A. Ruiz, O. Norniella, G. A. Thompson, K. Yi, G. P. Yeh, A. N. Sissakian, A. Artikov, Fabrizio Margaroli, E. Rogers, C. A. Cox, A. Napier, G. Velev, Teresa Rodrigo, P. Totaro, W. Badgett, Matthew Herndon, Y. Funakoshi, T. J. Phillips, P. de Barbaro, M. Bucciantonio, M. K. Jha, M. Shimojima, J. Deng, M. Hussein, S. Rolli, Benjamin Kilminster, M. Trovato, Franco Bedeschi, S. S. Yu, Y. Zeng, Barry Blumenfeld, Giovanni Bellettini, Fumihiko Ukegawa, L. Brigliadori, A. Loginov, Roman Lysak, Keunchang Cho, A. B. Wicklund, Frank Chlebana, B. Auerbach, S. Carrillo, C. Cuenca Almenar, M. D'Errico, S. Wilbur, Erik Brücken, C. Vellidis, B. Brau, L. Pondrom, E. Wicklund, Virgil E Barnes, Jay Dittmann, E. E. Schmidt, M. Gold, L. Sartori, D. Stentz, D. Dagenhart, Andrea Castro, E. Pueschel, Rainer Wallny, Y. Sakurai, K. Takemasa, U. Husemann, Ivan-Kresimir Furic, T. Wright, F. Vázquez, T. Aaltonen, M. J. Kim, Mauro Dell'Orso, Michele Gallinaro, Peter Wittich, M. Giunta, J. Vizán, B. Álvarez González, S. Budd, Paul Lujan, M. Kurata, Roger Moore, Alberto Annovi, D. O. Litvintsev, Matteo Bauce, H. W. Kim, A. Menzione, C. Pagliarone, D. Krop, C. Haber, D. Amidei, A. T. Goshaw, Ashesh D. Mehta, M. E. Convery, E. Palencia, Andrew Ivanov, J. Lys, Tara Shears, A. Pronko, R. Roser, Ivan Vila, M. P. Schmidt, K. Tollefson, Daniela Bortoletto, Y. Seiya, R. St. Denis, W. Johnson, A. Simonenko, A. Savoy-Navarro, V. Papadimitriou, A. Mukherjee, Aron Soha, S. Amerio, Christoph Paus, G. Giurgiu, N. Ranjan, J. E. Kim, R. E. Hughes, Z. Gunay-Unalan, A. Rahaman, D. Beecher, C. Ferrazza, M. Rossi, K. Makhoul, Manuela Campanelli, D. J. Cox, S. Shiraishi, A. Di Canto, S. Kwang, D. H. Kim, S. R. Hou, S. De Cecco, S. Errede, Yasuyoshi Nagai, Francesco Crescioli, P. Mehtala, I. Suslov, V. Rusu, Sally Seidel, M. Dorigo, S. Hewamanage, Stanislav Tokár, M. M. Deninno, J. S. Wilson, P. Barria, Naoki Kimura, R. Madrak, Federico Sforza, Andrew Beretvas, J. Naganoma, Andrea Bocci, G. Latino, M. Hurwitz, Tommaso Dorigo, Luciano Ristori, Tiehui Liu, N. Giokaris, K. Kondo, B. Jayatilaka, S. R. Hahn, S. Uozumi, M. Lancaster, G. Compostella, Eva Halkiadakis, E. Gerchtein, Jason Nielsen, A. T. Laasanen, B. Casal, A. Apresyan, A. Bodek, H. Wolfe, P. J. Bussey, Nicola D'Ascenzo, Maria Agnese Ciocci, I. Shreyber, Rodolfo Carosi, G. Pauletta, M. Stancari, A. Anastassov, G. L. Strycker, P. Ttito-Guzmán, U. K. Yang, R. Vilar, B. Whitehouse, S. Y. Jun, H. Miyake, D. Mietlicki, J. C. Yun, J. Pursley, D. W. Jang, P. Garosi, D. Torretta, A. Boveia, R. Forrest, Christopher Clarke, A. Golossanov, Alessandro Cerri, P. Catastini, M. J. Shochet, R. McNulty, M. Hare, M. Tecchio, T. R. Junk, V. A. Giakoumopoulou, F. Happacher, Emily Nurse, Yongsun Kim, Dario Bisello, A. Bhatti, M. Corbo, Y. C. Chen, J. Yoh, M. Rescigno, Justin Pilot, I. Yu, Kevin Lannon, Jian Tang, S. H. Kim, A. Varganov, C. Mesropian, W. H. Chung, Javier Cuevas, M. Kirby, Jacobo Konigsberg, P. Schlabach, Shalhout Shalhout, Giorgio Chiarelli, A. G. Clark, J. N. Bellinger, T. Miao, D. Chokheli, G. Chlachidze, A. Hocker, Koji Yamamoto, A. Manousakis-Katsikakis, Gervasio Gomez, C. Bromberg, P. K. Teng, M. Binkley, Guillelmo Gomez-Ceballos, J. Antos, Marcelo Vogel, O. Poukhov, W. Ashmanskas, S. Lockwitz, Sudhir Malik, M. Vidal, K. Gibson, A. Semenov, S. Behari, J. Boudreau, J. Patrick, S. Leo, D. Waters, Mark Kruse, Alison Lister, Xin Wu, M. Mussini, Fabrizio Scuri, S. B. Kim, L. Demortier, A. Scribano, S. Torre, C. Plager, K. Sliwa, S. Klimenko, Kevin Burkett, H. C. Fang, F. Devoto, S. Carron, J. Linacre, Maxim Goncharov, J. P. Fernandez, J. Galyardt, Duncan Carlsmith, Antonio Limosani, P. N. Dong, A. Mitra, James Russ, Stefano Giagu, Kazuhiko Hara, Kohei Yorita, D. Glenzinski, J. Thome, Luca Scodellaro, T. A. Schwarz, Fedor Prokoshin, Monica D'Onofrio, T. Okusawa, N. Moggi, I. Bizjak, Chuan-Ming Liu, P. Giromini, Koji Sato, Anna Zanetti, Robin Erbacher, M. Datta, N. Krumnack, K. S. McFarland, A. Barbaro-Galtieri, K. R. Bland, W-M. Yao, Amitabh Lath, Anna Sfyrla, J. Huston, F. Ruffini, Paola Giannetti, B. A. Barnett, Giorgio Apollinari, T. Yang, G. Punzi, D. Lucchesi, L. Oakes, Jane Nachtman, A. Brisuda, P. Mazzanti, Francesco Rubbo, K. K. Joo, J. Strologas, D. Cauz, Kaori Maeshima, H. S. Lee, Paolo Mastrandrea, Azeddine Kasmi, V. Ramakrishnan, J. Yamaoka, M. Iori, Ignacio Redondo, Hyun-Chul Kim, H. S. Budd, D. P. Benjamin, D. Errede, J. E. Garcia, K. T. Pitts, N. Ershaidat, Q. Liu, Y. Kato, Song-Ming Wang, J. Guimaraes Da Costa, S. Lami, I. V. Gorelov, Zhenbin Wu, F. Azfar, S. Somalwar, C. S. Moon, G. Manca, C. I. Ciobanu, M. Cordelli, R. Martínez-Ballarín, G. Busetto, Brian L Winer, G. Piacentino, S. Zucchelli, F. Rimondi, F. D. Snider, J. Y. Han, S. Wolbers, D. J. Kong, B. Carls, M. Lindgren, Pavol Bartos, M. J. Morello, Tomoko Yoshida, P. Lukens, Dean Hidas, V. V. Glagolev, Y. Sudo, P. Squillacioti, M. N. Mondragon, G. Introzzi, D. E. Pellett, K. Potamianos, Sergo Jindariani, L. Santi, J. Budagov, R. L. Lander, F. Ptohos, D. Hare, M. Campbell, Y. S. Chung, Michael Schmitt, Y. D. Oh, G. Flanagan, M. Stanitzki, Viviana Cavaliere, S. Moed, Stephan Lammel, Lucio Cerrito, E. J. Jeon, A. Sukhanov, M. E. Mattson, T. Tomura, S. Pagan Griso, P. Movilla Fernandez, J. P. Chou, A. Sedov, B. Di Ruzza, Chi Lin, J. R. Smith, G. B. Yu, A. Penzo, K. Ebina, T. Wakisaka, A. Hamaguchi, Markus Frank, T. Riddick, H. Gerberich, Mark Neubauer, R. Orava, G. Lungu, R. D. Field, C. M. Ginsburg, P. F. Shepard, S. H. Oh, Guido Volpi, O. González, Itsuo Nakano, Alan Garfinkel, Sandra Leone, W. K. Sakumoto, C. Grosso-Pilcher, N. Goldschmidt, Tetsuo Arisawa, and C. Neu

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Collider physics, Detector, Tevatron, Particle accelerator, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, 010306 general physics
Abstract

We present one additional study of multi-muon events produced at the Fermilab Tevatron collider and recorded by the CDF II detector. We use a data set acquired with a dedicated dimuon trigger and corresponding to an integrated luminosity of 3.9 fb{sup -1}. We investigate the distribution of the azimuthal angle between the two trigger muons in events containing at least four additional muon candidates to test the compatibility of these events with originating from known QCD processes. We find that this distribution is markedly different from what is expected from such QCD processes and this observation strongly disfavours the possibility that multi-muon events result from an underestimate of the rate of misidentified muons in ordinary QCD events.

Published
2012

33. Radon removal from gaseous xenon with activated charcoal

Author

Y. D. Kim, Shogo Nakamura, Ko Abe, A. Shinozaki, K. Hosokawa, K. Kobayashi, Jong-Man Lee, H. Uchida, Atsushi Takeda, F. Kusaba, K. Ueshima, K. Hieda, Hiroyuki Sekiya, Hiroshi Ogawa, Y. Fukuda, S. Hirano, Y. Takeuchi, D. Motoki, H. Takiya, I. Murayama, K.B. Lee, Shigeki Tasaka, Yoshitaka Itow, K. Otsuka, O. Takachio, Jing Liu, Masayuki Nakahata, Yasuhiro Kishimoto, Yusuke Koshio, M.K. Lee, Katsuki Hiraide, Y. Nishitani, D. Umemoto, K. Fujii, Kimiaki Masuda, A. Murata, K. Nishijima, K. Martens, Shigetaka Moriyama, Yoshihiro Suzuki, H. Nishiie, Masaki Yamashita, and Yong Hamb Kim

Subjects
Physics, Nuclear and High Energy Physics, Radiochemistry, chemistry.chemical_element, Radon, Trap (plumbing), Xenon, Linear relationship, chemistry, Activated charcoal, visual_art, visual_art.visual_art_medium, Charcoal, Instrumentation
Abstract

Many low background experiments using xenon need to remove radioactive radon to improve their sensitivities. However, no method of continually removing radon from xenon has been described in the literature. We studied a method to remove radon from xenon gas through an activated charcoal trap. From our measurements we infer a linear relationship between the mean propagation velocity vRn of radon and vXe of xenon in the trap with vRn=vXe ¼ð 0:967 0:10 Þ� 10

Published
2012

34. Measurement of the top quark mass in the lepton+jets channel using the lepton transverse momentum

Author

M. Cordelli, G. Busetto, Brian L Winer, D. J. Kong, S. Shiraishi, B. Carls, V. Sorin, P. Lukens, S. Kwang, D. H. Kim, J. Keung, M. Hurwitz, D. Torretta, P. Giannetti, Elliot Lipeles, C. Mesropian, S. Zucchelli, F. Rimondi, S. R. Hahn, G. L. Strycker, Y. Sudo, P. Squillacioti, M. DellʼOrso, D. Waters, M. Weinberger, A. Semenov, Ivan-Kresimir Furic, M. Kirby, N. dʼAscenzo, S. Donati, Elisabetta Pianori, A. V. Kotwal, H. H. Williams, G. Introzzi, A. Gresele, Y. Tu, L. Brigliadori, K. Potamianos, Luca Scodellaro, Federico Sforza, Keunchang Cho, Sergo Jindariani, W. Johnson, Allan G Clark, Roger Moore, A. Simonenko, D. O. Litvintsev, K. Takemasa, R. L. Wagner, J. Budagov, Marcelo Vogel, C. Plager, Anna Zanetti, D. Mietlicki, G. Giurgiu, V. Ramakrishnan, L. Demortier, M. J. Shochet, A. Savoy-Navarro, V. Papadimitriou, A. Aurisano, J. S. Wilson, N. Giokaris, R. L. Lander, F. Ptohos, A. Elagin, Jay Dittmann, D. Cauz, S. De Cecco, F. Vázquez, A. Rahaman, Aidan Robson, D. P. Benjamin, Joe Kroll, A. Scribano, G. Piacentino, K. Makhoul, Manfred Paulini, Manuela Campanelli, Andrew Beretvas, A. Artikov, S. Torre, V. Rusu, G. Compostella, Michele Gallinaro, P. Dong, P. Movilla Fernandez, K. Goulianos, J. Nett, Stefano Giagu, G. Velev, J. P. Chou, Chris Hays, S. Uozumi, A. Schmidt, Maria Agnese Ciocci, M. Corbo, M. Lancaster, B. Whitehouse, S. Y. Jun, Peter Wittich, Renaud Marti, A. Sedov, Matthew Herndon, J. C. Yun, H. Wolfe, B. Di Ruzza, M. K. Jha, Y. Kato, J. Guimaraes Da Costa, Tetsuo Arisawa, C. Neu, Kenichi Hatakeyama, V. Giakoumopoulou, Alexei Safonov, Alexander Paramonov, T. A. Schwarz, S. Budd, Paul Lujan, Y. Takeuchi, D. Dagenhart, D. Tonelli, R. Forrest, C. M. Ginsburg, Oliver Stelzer-Chilton, Yongsun Kim, J. Pursley, A. Mukherjee, Kazuhiko Hara, M. Rossi, Andrea Bocci, Emily Nurse, M. Hussein, S. Rolli, Benjamin Kilminster, P. Mehtala, M. Giunta, A. Mitra, N. Ranjan, Y. C. Chen, I. V. Gorelov, Zhenbin Wu, M. Heck, Robin Erbacher, D. Beecher, Peter Wagner, W-M. Yao, A. T. Laasanen, Pavol Bartos, M. M. Deninno, Jochen Jens Heinrich, M. Jones, D. Krop, I. Oksuzian, M. P. Schmidt, A. T. Goshaw, Barry Blumenfeld, Koji Yamamoto, A. Manousakis-Katsikakis, P. K. Teng, L. Santi, Giorgio Chiarelli, Fedor Prokoshin, T. Okusawa, Frank Chlebana, J. D. Lewis, Alberto Annovi, P. Mazzanti, G. A. Thompson, T. Kuhr, Z. Gunay-Unalan, P. F. Shepard, S. H. Oh, Julia Thom, W. Ketchum, Katsufumi Sato, Dean Hidas, V. V. Glagolev, N. Krumnack, K. S. McFarland, K. R. Bland, M. Mathis, W. Ashmanskas, Jason Nielsen, S. W. Lee, S. Lockwitz, Sudhir Malik, M. Vidal, Marco Trovato, K. Kondo, F. Wick, C. Cuenca Almenar, P. Ttito-Guzmán, E. Rogers, Giovanni Bellettini, L. Oakes, J. C. Freeman, A. Ruiz, Giuseppe Latino, K. Yi, A. N. Sissakian, Jane Nachtman, Fabrizio Margaroli, R. McNulty, M. Hare, Tiehui Liu, Rodolfo Carosi, U. K. Yang, J. Galyardt, E. Gerchtein, C. Pagliarone, Stanislav Tokár, J. A. Appel, P. Totaro, Maxwell Chertok, T. Yang, Guido Volpi, O. González, Itsuo Nakano, M. Franklin, Andrew Mehta, K. Tollefson, P. Catastini, C. Bromberg, V. Khotilovich, Y. Seiya, B. Brau, Rainer Wallny, H. Miyake, B. Casal, M. Tecchio, Jacobo Konigsberg, M. Kurata, Andrew Ivanov, Adrian Buzatu, S. R. Hou, Yasuyoshi Nagai, R. Madrak, J. Naganoma, G. De Lorenzo, J. Huston, K. Gibson, Chi Lin, J. R. Smith, G. B. Yu, I. Bizjak, J. Vizán, G. Pauletta, F. Happacher, Eva Halkiadakis, T. R. Junk, W. Badgett, Ignacio Redondo, Tommaso Dorigo, Thomas LeCompte, R. Vilar, N. Hussain, Alan Garfinkel, P. McIntyre, S. Errede, J. E. Kim, R. E. Hughes, Michal Kreps, C. Haber, K. K. Joo, D. W. Jang, B. Auerbach, M. DʼOnofrio, S. Carrillo, A. Varganov, Dario Bisello, P. de Barbaro, M. Bucciantonio, Franco Bedeschi, V. Cavaliere, A. Bhatti, Matteo Bauce, D. Toback, T. Rodriguez, Petar Maksimovic, K. T. Pitts, Kevin Lannon, Stefano Camarda, J. Yoh, Daniela Bortoletto, P. E. Karchin, M. N. Mondragon, M. Rescigno, Justin Pilot, S. Tkaczyk, G. Flanagan, J. S. H. Lee, W. C. Wester, Y. C. Yang, Tara Shears, M. Shimojima, D. Goldin, I. Suslov, J. Morlock, Q. Liu, J. Lueck, Sandra Leone, Massimo Casarsa, C. P. Marino, W. H. Hopkins, M. Feindt, Sally Seidel, I. Yu, Daniel Whiteson, O. Poukhov, S. Hewamanage, Sinead Farrington, P. Schlabach, F. Ruffini, Guillelmo Gomez-Ceballos, J. Antos, L. Ortolan, Shalhout Shalhout, C. Ferrazza, C. Vellidis, V. Saveliev, Andreas Warburton, Song-Ming Wang, W. H. Chung, A. Hocker, J. Patrick, S. Leo, Evelyn Thomson, G. P. Yeh, C. Deluca, H. S. Kim, Fabrizio Scuri, L. Pondrom, E. Wicklund, M. Mussini, W. K. Sakumoto, C. Calancha, S. Behari, J. Boudreau, J. Asaadi, Gervasio Gomez, P. Barria, J. Strologas, M. Iori, M. Stancari, P. Garosi, Virgil E Barnes, F. Azfar, Mark Kruse, Alison Lister, P. Sinervo, D. E. Pellett, A. Golossanov, Alessandro Cerri, S. Amerio, D. Lucchesi, Bernd Stelzer, A. Brisuda, A. Napier, E. James, Naoki Kimura, J. P. Fernandez, N. Moggi, J. Linacre, Chuan-Ming Liu, E. Pueschel, F. Crescioli, Maxim Goncharov, I. Lazzizzera, D. Horn, S. Lami, Teresa Rodrigo, C. Grosso-Pilcher, R. Culbertson, Sebastian Grinstein, O. Norniella, Ricardo Eusebi, James Russ, Y. Funakoshi, Kohei Yorita, D. Glenzinski, T. Wright, T. Aaltonen, F. Canelli, N. Goldschmidt, H. C. Fang, S. Somalwar, A. Anastassov, Peter Bussey, J. Deng, Jian Tang, S. H. Kim, J. Thome, T. J. Phillips, Christoph Paus, G. Punzi, A. Menzione, F. Devoto, Javier Cuevas, S. Carron, G. Chlachidze, M. J. Kim, A. Canepa, Roman Lysak, M. E. Convery, J. Lys, D. Amidei, Markus Frank, A. Boveia, C. A. Cox, R. Roser, Ivan Vila, M. Martí, Aron Soha, S. Wilbur, N. Ershaidat, Duncan Carlsmith, P. Murat, D. J. Cox, A. Di Canto, J. N. Bellinger, M. dʼErrico, Mark Neubauer, R. Orava, C. I. Ciobanu, M. Datta, P. B. Renton, S. S. Yu, M. Binkley, L. Nodulman, H. S. Budd, Th. Müller, K. Ebina, S. B. Kim, G. Lungu, A. Eppig, K. Sliwa, S. Klimenko, Y. Zeng, H. W. Kim, B. Jayatilaka, R. D. Field, T. Miao, D. Errede, A. Barbaro-Galtieri, D. Chokheli, Aldo Penzo, I. Shreyber, P. Giromini, A. Pronko, Arie Bodek, G. Bauer, Kevin Burkett, F. D. Snider, H. Gerberich, T. Wakisaka, R. St. Denis, J. Y. Han, S. Wolbers, A. Hamaguchi, Stephan Lammel, Lucio Cerrito, Xin Wu, Y. Sakurai, N. S. Lockyer, G. Manca, M. Lindgren, E. J. Jeon, A. Sukhanov, M. J. Morello, M. Dorigo, M. Gold, Tomoko Yoshida, L. Sartori, R. F. Harr, Amitabh Lath, M. E. Mattson, Andrea Castro, T. Tomura, S. Pagan Griso, D. Hare, Anna Sfyrla, E. Palencia, B. A. Barnett, Giorgio Apollinari, L. Ristori, U. Husemann, Teruki Kamon, Francesco Rubbo, B. Álvarez González, M. Campbell, Kaori Maeshima, Y. S. Chung, H. S. Lee, Paolo Mastrandrea, P. Wilson, J. E. Garcia, A. Apresyan, Matteo Cavalli-Sforza, Vyacheslav Krutelyov, Michael Schmitt, Y. D. Oh, Fumihiko Ukegawa, J. Conway, E. Lee, M. Stanitzki, A. Loginov, A. B. Wicklund, S. Moed, Erik Brücken, E. E. Schmidt, D. Stentz, J. Yamaoka, and C. S. Moon

Subjects
Physics, Systematic error, Quantum chromodynamics, Nuclear and High Energy Physics, Top quark, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Tevatron, 01 natural sciences, Consistency test, Nuclear physics, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Fermilab, 010306 general physics, Lepton
Abstract

This letter reports a measurement of the top quark mass, M{sub top}, in data from p{bar p} collisions at {radical}s = 1.96 TeV corresponding to 2.7 fb{sup -1} of integrated luminosity at the Fermilab Tevatron using the CDF II detector. Events with the lepton+jets topology are selected. An unbinned likelihood is constructed based on the dependence of the lepton transverse momentum, P{sub T}, on M{sub top}. A maximum likelihood fit to the data yields a measured mass M{sub top} = 176.9 {+-} 8.0{sub stat} {+-} 2.7{sub syst} GeV/c{sup 2}. In this measurement, the contribution by the jet energy scale uncertainty to the systematic error is negligible. The result provides an important consistency test for other M{sub top} measurements where explicit use of the jet energy is made for deriving the top quark mass.

Published
2011

35. NEXT GENERATION SEQUENCING AND EXPERIMENTAL MYOLOGY

Author

A. Takano, Michio Inoue, Sho Yonezawa, Mariko Okubo, Y. Takeuchi, Ichizo Nishino, Toshiya Iwamori, Issei Ozawa, Hiroki Nakano, Yoshinori Kabeya, and Reitaro Tokumasu

Subjects
Neurology, Myology, Pediatrics, Perinatology and Child Health, Computational biology, Neurology (clinical), Biology, DNA sequencing, Genetics (clinical)
Published
2018

36. Measurement of dσ/dy of Drell–Yan e+e− pairs in the Z mass region from pp¯ collisions at s=1.96 TeV

Author

T. Aaltonen, J. Adelman, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, J. Appel, A. Apresyan, T. Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, A. Attal, A. Aurisano, F. Azfar, W. Badgett, A. Barbaro-Galtieri, V.E. Barnes, B.A. Barnett, P. Barria, P. Bartos, G. Bauer, P.-H. Beauchemin, F. Bedeschi, D. Beecher, S. Behari, G. Bellettini, J. Bellinger, D. Benjamin, A. Beretvas, A. Bhatti, M. Binkley, D. Bisello, I. Bizjak, R.E. Blair, C. Blocker, B. Blumenfeld, A. Bocci, A. Bodek, V. Boisvert, D. Bortoletto, J. Boudreau, A. Boveia, B. Brau, A. Bridgeman, L. Brigliadori, C. Bromberg, E. Brubaker, J. Budagov, H.S. Budd, S. Budd, K. Burkett, G. Busetto, P. Bussey, A. Buzatu, K.L. Byrum, S. Cabrera, C. Calancha, S. Camarda, M. Campanelli, M. Campbell, F. Canelli, A. Canepa, B. Carls, D. Carlsmith, R. Carosi, S. Carrillo, S. Carron, B. Casal, M. Casarsa, A. Castro, P. Catastini, D. Cauz, V. Cavaliere, M. Cavalli-Sforza, A. Cerri, L. Cerrito, S.H. Chang, Y.C. Chen, M. Chertok, G. Chiarelli, G. Chlachidze, F. Chlebana, K. Cho, D. Chokheli, J.P. Chou, K. Chung, W.H. Chung, Y.S. Chung, T. Chwalek, C.I. Ciobanu, M.A. Ciocci, A. Clark, D. Clark, G. Compostella, M.E. Convery, J. Conway, M. Corbo, M. Cordelli, C.A. Cox, D.J. Cox, F. Crescioli, C. Cuenca Almenar, J. Cuevas, R. Culbertson, J.C. Cully, D. Dagenhart, N. d'Ascenzo, M. Datta, T. Davies, P. de Barbaro, S. De Cecco, A. Deisher, G. De Lorenzo, M. Dell'Orso, C. Deluca, L. Demortier, J. Deng, M. Deninno, M. d'Errico, A. Di Canto, B. Di Ruzza, J.R. Dittmann, M. D'Onofrio, S. Donati, P. Dong, T. Dorigo, S. Dube, K. Ebina, A. Elagin, R. Erbacher, D. Errede, S. Errede, N. Ershaidat, R. Eusebi, H.C. Fang, S. Farrington, W.T. Fedorko, R.G. Feild, M. Feindt, J.P. Fernandez, C. Ferrazza, R. Field, G. Flanagan, R. Forrest, M.J. Frank, M. Franklin, J.C. Freeman, I. Furic, M. Gallinaro, J. Galyardt, F. Garberson, J.E. Garcia, A.F. Garfinkel, P. Garosi, H. Gerberich, D. Gerdes, A. Gessler, S. Giagu, V. Giakoumopoulou, P. Giannetti, K. Gibson, J.L. Gimmell, C.M. Ginsburg, N. Giokaris, M. Giordani, P. Giromini, M. Giunta, G. Giurgiu, V. Glagolev, D. Glenzinski, M. Gold, N. Goldschmidt, A. Golossanov, G. Gomez, G. Gomez-Ceballos, M. Goncharov, O. González, I. Gorelov, A.T. Goshaw, K. Goulianos, A. Gresele, S. Grinstein, C. Grosso-Pilcher, R.C. Group, U. Grundler, J. Guimaraes da Costa, Z. Gunay-Unalan, C. Haber, S.R. Hahn, E. Halkiadakis, B.-Y. Han, J.Y. Han, F. Happacher, K. Hara, D. Hare, M. Hare, R.F. Harr, M. Hartz, K. Hatakeyama, C. Hays, M. Heck, J. Heinrich, M. Herndon, J. Heuser, S. Hewamanage, D. Hidas, C.S. Hill, D. Hirschbuehl, A. Hocker, S. Hou, M. Houlden, S.-C. Hsu, R.E. Hughes, M. Hurwitz, U. Husemann, M. Hussein, J. Huston, J. Incandela, G. Introzzi, M. Iori, A. Ivanov, E. James, D. Jang, B. Jayatilaka, E.J. Jeon, M.K. Jha, S. Jindariani, W. Johnson, M. Jones, K.K. Joo, S.Y. Jun, J.E. Jung, T.R. Junk, T. Kamon, D. Kar, P.E. Karchin, Y. Kato, R. Kephart, W. Ketchum, J. Keung, V. Khotilovich, B. Kilminster, D.H. Kim, H.S. Kim, H.W. Kim, J.E. Kim, M.J. Kim, S.B. Kim, S.H. Kim, Y.K. Kim, N. Kimura, L. Kirsch, S. Klimenko, K. Kondo, D.J. Kong, J. Konigsberg, A. Korytov, A.V. Kotwal, M. Kreps, J. Kroll, D. Krop, N. Krumnack, M. Kruse, V. Krutelyov, T. Kuhr, N.P. Kulkarni, M. Kurata, S. Kwang, A.T. Laasanen, S. Lami, S. Lammel, M. Lancaster, R.L. Lander, K. Lannon, A. Lath, G. Latino, I. Lazzizzera, T. LeCompte, E. Lee, H.S. Lee, J.S. Lee, S.W. Lee, S. Leone, J.D. Lewis, C.-J. Lin, J. Linacre, M. Lindgren, E. Lipeles, A. Lister, D.O. Litvintsev, C. Liu, T. Liu, N.S. Lockyer, A. Loginov, L. Lovas, D. Lucchesi, J. Lueck, P. Lujan, P. Lukens, G. Lungu, J. Lys, R. Lysak, D. MacQueen, R. Madrak, K. Maeshima, K. Makhoul, P. Maksimovic, S. Malde, S. Malik, G. Manca, A. Manousakis-Katsikakis, F. Margaroli, C. Marino, C.P. Marino, A. Martin, V. Martin, M. Martínez, R. Martínez-Ballarín, P. Mastrandrea, M. Mathis, M.E. Mattson, P. Mazzanti, K.S. McFarland, P. McIntyre, R. McNulty, A. Mehta, P. Mehtala, A. Menzione, C. Mesropian, T. Miao, D. Mietlicki, N. Miladinovic, R. Miller, C. Mills, M. Milnik, A. Mitra, G. Mitselmakher, H. Miyake, S. Moed, N. Moggi, M.N. Mondragon, C.S. Moon, R. Moore, M.J. Morello, J. Morlock, P. Movilla Fernandez, J. Mülmenstädt, A. Mukherjee, Th. Muller, P. Murat, M. Mussini, J. Nachtman, Y. Nagai, J. Naganoma, K. Nakamura, I. Nakano, A. Napier, J. Nett, C. Neu, M.S. Neubauer, S. Neubauer, J. Nielsen, L. Nodulman, M. Norman, O. Norniella, E. Nurse, L. Oakes, S.H. Oh, Y.D. Oh, I. Oksuzian, T. Okusawa, R. Orava, K. Osterberg, S. Pagan Griso, C. Pagliarone, E. Palencia, V. Papadimitriou, A. Papaikonomou, A.A. Paramanov, B. Parks, S. Pashapour, J. Patrick, G. Pauletta, M. Paulini, C. Paus, T. Peiffer, D.E. Pellett, A. Penzo, T.J. Phillips, G. Piacentino, E. Pianori, L. Pinera, K. Pitts, C. Plager, L. Pondrom, K. Potamianos, O. Poukhov, F. Prokoshin, A. Pronko, F. Ptohos, E. Pueschel, G. Punzi, J. Pursley, J. Rademacker, A. Rahaman, V. Ramakrishnan, N. Ranjan, I. Redondo, P. Renton, M. Renz, M. Rescigno, S. Richter, F. Rimondi, L. Ristori, A. Robson, T. Rodrigo, T. Rodriguez, E. Rogers, S. Rolli, R. Roser, M. Rossi, R. Rossin, P. Roy, A. Ruiz, J. Russ, V. Rusu, B. Rutherford, H. Saarikko, A. Safonov, W.K. Sakumoto, L. Santi, L. Sartori, K. Sato, V. Saveliev, A. Savoy-Navarro, P. Schlabach, A. Schmidt, E.E. Schmidt, M.A. Schmidt, M.P. Schmidt, M. Schmitt, T. Schwarz, L. Scodellaro, A. Scribano, F. Scuri, A. Sedov, S. Seidel, Y. Seiya, A. Semenov, L. Sexton-Kennedy, F. Sforza, A. Sfyrla, S.Z. Shalhout, T. Shears, P.F. Shepard, M. Shimojima, S. Shiraishi, M. Shochet, Y. Shon, I. Shreyber, A. Simonenko, P. Sinervo, A. Sisakyan, A.J. Slaughter, J. Slaunwhite, K. Sliwa, J.R. Smith, F.D. Snider, R. Snihur, A. Soha, S. Somalwar, V. Sorin, P. Squillacioti, M. Stanitzki, R.St. Denis, B. Stelzer, O. Stelzer-Chilton, D. Stentz, J. Strologas, G.L. Strycker, J.S. Suh, A. Sukhanov, I. Suslov, A. Taffard, R. Takashima, Y. Takeuchi, R. Tanaka, J. Tang, M. Tecchio, P.K. Teng, J. Thom, J. Thome, G.A. Thompson, E. Thomson, P. Tipton, P. Ttito-Guzmán, S. Tkaczyk, D. Toback, S. Tokar, K. Tollefson, T. Tomura, D. Tonelli, S. Torre, D. Torretta, P. Totaro, M. Trovato, S.-Y. Tsai, Y. Tu, N. Turini, F. Ukegawa, S. Uozumi, N. van Remortel, A. Varganov, E. Vataga, F. Vázquez, G. Velev, C. Vellidis, M. Vidal, I. Vila, R. Vilar, M. Vogel, I. Volobouev, G. Volpi, P. Wagner, R.G. Wagner, R.L. Wagner, W. Wagner, J. Wagner-Kuhr, T. Wakisaka, R. Wallny, S.M. Wang, A. Warburton, D. Waters, M. Weinberger, J. Weinelt, W.C. Wester, B. Whitehouse, D. Whiteson, A.B. Wicklund, E. Wicklund, S. Wilbur, G. Williams, H.H. Williams, P. Wilson, B.L. Winer, P. Wittich, S. Wolbers, C. Wolfe, H. Wolfe, T. Wright, X. Wu, F. Würthwein, A. Yagil, K. Yamamoto, J. Yamaoka, U.K. Yang, Y.C. Yang, W.M. Yao, G.P. Yeh, K. Yi, J. Yoh, K. Yorita, T. Yoshida, G.B. Yu, I. Yu, S.S. Yu, J.C. Yun, A. Zanetti, Y. Zeng, X. Zhang, Y. Zheng, and S. Zucchelli

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Sigma, Drell–Yan process, Parton, 01 natural sciences, Luminosity, Distribution function, 0103 physical sciences, Rapidity, 010306 general physics, Boson
Abstract

We report on a CDF measurement of the total cross section and rapidity distribution, d{sigma}/dy, for q{bar q} {yields} {gamma}{sup *}/Z {yields} e{sup +} e {sup -} events in the Z boson mass region (66 < M {sub ee} < 116 GeV/c {sub 2}) produced in p{bar p} collisions at {radical}s = 1.96 TeV with 2.1 fb{sup -1} of integrated luminosity. The measured cross section of 257 {+-} 16pb and d{sigma}/dy distribution are compared with Next-to-Leading-Order (NLO) and Next-to-Next-to-Leading-Order (NNLO) QCD theory predictions with CTEQ and MRST/MSTW parton distribution functions (PDFs). There is good agreement between the experimental total cross section and d{sigma}/dy measurements with theoretical calcualtion with the most recent NNLO PDFs.

Published
2010

37. Search for new color-octet vector particle decaying to tt¯ in pp¯ collisions at s=1.96 TeV

Author

Joe Kroll, Jochen Jens Heinrich, Chris Hays, M. Giunta, G. A. Thompson, Monica D'Onofrio, C. P. Marino, E. Rogers, Marcelo Vogel, C. Plager, Shih-Chieh Hsu, J. Nett, Mario Campanelli, N. Krumnack, K. S. McFarland, M. Mathis, D. Hare, Stefano Giagu, S. Z. Shalhout, J. Deng, Jonas Rademacker, G. Latino, Alexei Safonov, J. D. Lewis, Alberto Annovi, S. Shiraishi, V. Khotilovich, Y. Seiya, J. Mülmenstädt, H. W. Kim, Kyung-Suk Cho, R. E. Hughes, T. Rodriguez, Petar Maksimovic, Thorsten Chwalek, S. Kwang, V. A. Giakoumopoulou, Massimo Casarsa, K. Kondo, D. J. Cox, A. Di Canto, M. Kurata, Andrew Ivanov, Ivan-Kresimir Furic, Y. D. Oh, M. Hurwitz, P. H. Beauchemin, M. Campbell, Jason Nielsen, B. Casal, S. R. Hahn, Daniela Bortoletto, P. E. Karchin, S. Carrillo, G. Pauletta, D. W. Jang, B. Jayatilaka, Jeannine Wagner-Kuhr, C. Pagliarone, Stanislav Tokár, P. Movilla Fernandez, J. P. Chou, Y. S. Chung, Roman Lysak, A. A. Paramanov, C. Calancha, M. Iori, S. Amerio, K. K. Joo, R. F. Harr, D. Krop, A. Sedov, B. Whitehouse, S. Y. Jun, L. Lovas, M. Gold, J. M. Heuser, G. Velev, R. Kephart, R. Culbertson, O. Norniella, S. W. Lee, P. Ttito-Guzmán, Je Jung, D. Amidei, S. Wilbur, W. Johnson, A. Simonenko, P. Garosi, Adrian Buzatu, V. Boisvert, B. Di Ruzza, Elliot Lipeles, N. Moggi, A. T. Goshaw, Rainer Wallny, L. Sartori, S. Lami, S. Somalwar, Deepak Kar, A. J. Martin, C. Vellidis, M. N. Mondragon, Tara Shears, C. A. Cox, J. Lueck, Chi Lin, M. Weinberger, W. H. Chung, V. Papadimitriou, F. Bedeschi, K. Makhoul, Manfred Paulini, N. Van Remortel, Chuan-Ming Liu, Thomas LeCompte, C. Wolfe, A. Menzione, D. E. Pellett, S. Pashapour, A. Apresyan, G. Punzi, L. Pondrom, E. Wicklund, P. Roy, Z. Gunay-Unalan, P. J. Bussey, Intae Yu, A. Bridgeman, E. Brubaker, R. Martínez-Ballarín, Thomas Peiffer, Frank Chlebana, S. Cabrera, F. Ptohos, H. H. Williams, J. R. Smith, G. B. Yu, M. D'Errico, F. Garberson, Mauro Dell'Orso, J. Asaadi, Avraham Yagil, Andrew Beretvas, J. Keung, D. Torretta, Y. Tu, H. C. Fang, S. R. Hou, C. Haber, T. Kuhr, Robin Erbacher, M. Datta, W-M. Yao, A. Canepa, S. Errede, Yasuyoshi Nagai, Francesco Crescioli, K. Gibson, P. B. Renton, S. S. Yu, Emily Nurse, K. Potamianos, S. Budd, Paul Lujan, MarioPaolo Giordani, S. Richter, A. Scribano, Giovanni Bellettini, Stephan Lammel, Lucio Cerrito, E. James, Naoki Kimura, Michal Kreps, S. Torre, S. Seidel, O. Poukhov, L. Pinera, J. Yamaoka, A. Attal, R. Madrak, Robert Snihur, S. Malde, C. Mesropian, A. Aurisano, J. Slaunwhite, Antonio Boveia, X. Zhang, N. Giokaris, J. C. Yun, Oliver Stelzer-Chilton, Yongsun Kim, C. Deluca, Fabrizio Scuri, G. Williams, J. Naganoma, J. E. Kim, Eva Halkiadakis, M. Corbo, Y. C. Chen, I. Shreyber, Malte Renz, M. P. Schmidt, R. Carosi, P. Catastini, Sergo Jindariani, A. Schmidt, G. Compostella, J. Budagov, E. J. Jeon, A. Sukhanov, M. E. Mattson, Y. Takeuchi, A. Semenov, A. Pronko, C. S. Moon, A. Rahaman, W. Ketchum, Y. Zeng, Ulysses Grundler, M. Cordelli, G. Busetto, Brian L Winer, A. Taffard, A. Mitra, J. N. Bellinger, C. I. Ciobanu, P. Totaro, J. Lys, R. Roser, Ivan Vila, Maxwell Chertok, D. Lucchesi, Bernd Stelzer, A. N. Sisakyan, Corrinne Mills, R. G. Wagner, B. Y. Han, L. Brigliadori, R. Forrest, L. Santi, Giorgio Chiarelli, D. Clark, Maria Agnese Ciocci, C. Bromberg, A. Deisher, S. Carron, Duncan Carlsmith, Kevin Lannon, R. L. Lander, T. Tomura, Michael Schmitt, H. S. Budd, N. Turini, A. Artikov, M. Hartz, D. Waters, J. Morlock, S. Pagan Griso, J. Patrick, M. Lindgren, J. S. H. Lee, B. Rutherford, I. Bizjak, W. Badgett, G. Flanagan, J. Conway, E. Lee, M. Stanitzki, Fumihiko Ukegawa, Guenakh Mitselmakher, Kevin Burkett, A. Loginov, A. B. Wicklund, A. Barbaro-Galtieri, T. R. Junk, G. L. Strycker, D. Mietlicki, Tiehui Liu, Tomoko Yoshida, S. Behari, J. Boudreau, A. Elagin, Jay Dittmann, Virgil E Barnes, M. A. Schmidt, S. Neubauer, M. J. Shochet, S. Y. Tsai, L. Sexton-Kennedy, Roger Moore, D. O. Litvintsev, G. P. Di Giovanni, U. K. Yang, Wolfgang Wagner, D. Cauz, S. Moed, D. Hirschbuehl, E. E. Schmidt, D. Stentz, D. Dagenhart, Guillelmo Gomez-Ceballos, J. Antos, M. Heck, H. Miyake, Matthew Herndon, D. Beecher, Peter Wagner, K. Tollefson, M. K. Jha, G. Manca, Maxim Goncharov, E. Pueschel, P. Mehtala, Sooran Kim, F. Happacher, M. Mussini, Pavol Bartos, Koji Nakamura, T. Wright, L. Demortier, Vyacheslav Krutelyov, A. Savoy-Navarro, Michele Gallinaro, J. Strologas, A. Gresele, P. Sinervo, S. Dube, P. N. Dong, W. C. Wester, A. Papaikonomou, M. Hussein, S. Rolli, Benjamin Kilminster, Dario Bisello, M. E. Convery, Luca Scodellaro, A. Bhatti, T. Aaltonen, M. Trovato, K. L. Byrum, Frank Würthwein, M. J. Kim, Dean Hidas, S. Zucchelli, R. St. Denis, Peter Wittich, P. Giromini, S. Donati, Kenichi Hatakeyama, P. Murat, Barry Blumenfeld, C. Paus, M. Franklin, Elisabetta Pianori, A. V. Kotwal, F. Vázquez, M. Shimojima, K. Osterberg, M. M. Deninno, G. Giurgiu, Jahred Adelman, T. Miao, L. Ristori, M. Feindt, B. Brau, Koji Sato, D. Chokheli, R. E. Blair, Anna Zanetti, V. V. Glagolev, F. Rimondi, L. Nodulman, K. Ebina, M. Rescigno, P. Schlabach, S. De Cecco, J. P. Fernandez, Joe Incandela, E. Palencia, Aldo Penzo, Koji Yamamoto, Y. Shon, A. Manousakis-Katsikakis, A. G. Clark, P. K. Teng, L. E. Kirsch, T. Wakisaka, Thomas Schwarz, G. Bauer, M. J. Morello, Christopher Neu, Ricardo Eusebi, L. Oakes, Jane Nachtman, A. Hocker, F. D. Snider, Federico Sforza, J. Y. Han, J. C. Freeman, A. Gessler, A. Ruiz, J. C. Cully, Aron Soha, D. J. Kong, V. Rusu, V. Cavaliere, N. Ranjan, S. Wolbers, W. Ashmanskas, Sudhir Malik, M. Vidal, B. Carls, V. Sorin, P. Lukens, Mark Kruse, Alison Lister, D. W. Gerdes, Tetsuo Arisawa, S. Tourneur, J. Linacre, Paul Tipton, Xin Wu, M. Lancaster, A. T. Laasanen, F. Canelli, R. McNulty, M. Hare, P. Barria, Daijin Kim, Ignacio Redondo, Hyun-Chul Kim, Sebastian Grinstein, B. Parks, James Russ, Kohei Yorita, D. Glenzinski, J. Galyardt, J. Thome, J. L. Gimmell, W. T. Fedorko, M. Tecchio, Igor Volobouev, J. Yoh, K. Yi, Fabrizio Margaroli, A. Varganov, M. Martinez, H. Wolfe, Andreas Warburton, M. Jones, S. Tkaczyk, N. S. Lockyer, K. T. Pitts, E. Thomson, Roberto Rossin, R. G. Feild, Michael L. Norman, Julia Thom, J. Pursley, J. S. Suh, N. Ershaidat, G. P. Yeh, Amitabh Lath, R. L. Wagner, Anna Sfyrla, Paola Giannetti, B. A. Barnett, Giorgio Apollinari, Satoru Uozumi, K. Goulianos, A. Napier, Andrew Mehta, Jacobo Konigsberg, P. de Barbaro, Teresa Rodrigo, D. Toback, Teruki Kamon, Craig Blocker, C. Ferrazza, T. J. Phillips, Song-Ming Wang, F. Azfar, Kaori Maeshima, H. S. Lee, Paolo Mastrandrea, Stefano Camarda, Daniel Whiteson, N. P. Kulkarni, V. Ramakrishnan, I. Lazzizzera, Aidan Robson, D. P. Benjamin, D. Errede, P. Wilson, J. E. Garcia, Matteo Cavalli-Sforza, Y. Kato, J. Guimaraes Da Costa, D. Tonelli, Gervasio Gomez, I. V. Gorelov, M. A. Houlden, A. Anastassov, Andrey Korytov, J. Weinelt, I. Suslov, S. Hewamanage, Sinead Farrington, G. Introzzi, R. Takashima, A. Bodek, M. Binkley, A. Golossanov, Shih-Fu Chang, Alessandro Cerri, Y. Zheng, Jian Tang, S. H. Kim, Javier Cuevas, G. Chlachidze, C. Cuenca Almenar, Th. Müller, K. Sliwa, S. Klimenko, G. Piacentino, P. Squillacioti, Kazuhiko Hara, N. Miladinovic, Andrea Castro, Fedor Prokoshin, A. J. Slaughter, T. Okusawa, P. Mazzanti, V. Martin, Markus Frank, D. MacQueen, H. Gerberich, G. De Lorenzo, J. Huston, M. Milnik, Mark Neubauer, R. Orava, U. Husemann, B. Álvarez González, G. Lungu, R. D. Field, C. M. Ginsburg, P. F. Shepard, S. H. Oh, K. Chung, R. J. Miller, A. Mukherjee, Reisaburo Tanaka, Guido Volpi, M. Rossi, O. González, Andrea Bocci, Tommaso Dorigo, R. Vilar, Y. C. Yang, E. Vataga, H. Saarikko, Itsuo Nakano, Alan Garfinkel, P. McIntyre, T. Davies, C. S. Hill, Sandra Leone, W. K. Sakumoto, C. Grosso-Pilcher, I. Oksuzian, and N. Goldschmidt

Subjects
Quark, Physics, Nuclear and High Energy Physics, Top quark, Particle physics, Mass distribution, 010308 nuclear & particles physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Tevatron, Jet (particle physics), 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Fermilab, Nuclear Experiment, 010306 general physics
Abstract

We present the result of a search for a massive color-octet vector particle, (e.g. a massive gluon) decaying to a pair of top quarks in proton–antiproton collisions with a center-of-mass energy of 1.96 TeV. This search is based on 1.9 fb − 1 of data collected using the CDF detector during Run II of the Tevatron at Fermilab. We study t t ¯ events in the lepton + jets channel with at least one b-tagged jet. A massive gluon is characterized by its mass, decay width, and the strength of its coupling to quarks. These parameters are determined according to the observed invariant mass distribution of top quark pairs. We set limits on the massive gluon coupling strength for masses between 400 and 800 GeV / c 2 and width-to-mass ratios between 0.05 and 0.50. The coupling strength of the hypothetical massive gluon to quarks is consistent with zero within the explored parameter space.

Published
2010

39. Phase I/II clinical study of percutaneous vertebroplasty (PVP) as palliation for painful malignant vertebral compression fractures (PMVCF): JIVROSG-0202

Author

Yasuaki Arai, Miyuki Sone, Y. Takeuchi, Yasukazu Shioyama, Yoshitaka Inaba, Noboru Tanigawa, Y. Nakajima, T. Kobayashi, Osamu Matsui, and M. Kadoya

Subjects
Adult, Male, medicine.medical_specialty, Palliative care, Visual analogue scale, Pathologic fracture, medicine.medical_treatment, Bone Neoplasms, Percutaneous vertebroplasty, Fractures, Compression, medicine, Humans, Aged, Aged, 80 and over, Vertebroplasty, medicine.diagnostic_test, business.industry, Palliative Care, Interventional radiology, Hematology, Middle Aged, medicine.disease, Confidence interval, Surgery, Clinical trial, Oncology, Spinal Fractures, Female, Onset of action, business
Abstract

Background The safety and efficacy of percutaneous vertebroplasty (PVP), a new treatment modality for painful malignant vertebral compression fractures (PMVCF) using interventional radiology techniques, were evaluated prospectively. Materials and methods After confirming the absence of safety issues in phase 1, a total of 33 cases were registered up to and including phase 2. Safety and efficacy were evaluated by National Cancer Institute—Common Toxicity Criteria version 2 and Visual Analogue Scale (VAS) at 1 week after PVP. Based on VAS score decreases, efficacy was classified into significantly effective (SE; ≥5 or reached 0–2), moderately effective (ME; 2–4), or ineffective (NE; Results Procedures were completed in all 33 patients (42 vertebrae). Thirty days after PVP, two patients died of primary disease progression, but no major adverse reactions (>grade 2) were observed. Response rate was 70% (95% confidence interval 54% to 83%) [61% (n = 20) with SE, 9% (n = 3) with ME, and 30% (n = 10) with NE] and increased to 83% at week 4. Median time to response was 1 day (mean 2.4). Median pain-mitigated survival period was 73 days. Conclusion For PMVCF, PVP is a safe and effective treatment modality with immediate onset of action.

Published
2009

40. Raman spectroscopy of type-I and type-VIII silicon clathrate alloys Sr8Al Ga16−Si30

Author

N. Ikeda, Shigeo Sasaki, Hiroyasu Shimizu, Kengo Kishimoto, Tetsuji Kume, Tsuyoshi Koyanagi, and Y. Takeuchi

Subjects
Phase transition, Silicon, Chemistry, Mechanical Engineering, Superlattice, Metals and Alloys, Analytical chemistry, chemistry.chemical_element, symbols.namesake, Nuclear magnetic resonance, Mechanics of Materials, Phase (matter), Materials Chemistry, symbols, Einstein solid, Thin film, Gallium, Raman spectroscopy
Abstract

Raman spectra of type-I and type-VIII silicon clathrates have been measured at ambient temperature and pressure for Sr 8 Al x Ga 16− x Si 30 alloys prepared by changing the Al/Ga ratio. Although the broadening of Raman bands appeared, due to the disorder of the host framework by replacing the Si sites by Al and Ga atoms, the phase transition from type-I to type-VIII ( x = from 7 to 8) was confirmed from the following changes; in type-VIII phase, (1) Sr guest vibrations shift toward higher frequencies by the decrease in the size of host cage and (2) the appearance of sharp and strong peak of Sr vibration at about 75 cm −1 . All Sr vibrational frequencies are consistently compared with the Einstein temperatures estimated from the atomic displacement parameters (ADPs) in X-ray diffraction (XRD) data.

Published
2009

41. Distillation of liquid xenon to remove krypton

Author

K. Abe, J. Hosaka, T. Iida, M. Ikeda, K. Kobayashi, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, Y. Nakajima, T. Namba, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takeuchi, K. Ueshima, M. Yamashita, K. Kaneyuki, Y. Ebizuka, J. Kikuchi, A. Ota, S. Suzuki, T. Takahashi, H. Hagiwara, T. Kamei, K. Miyamoto, T. Nagase, S. Nakamura, Y. Ozaki, T. Sato, Y. Fukuda, K. Nishijima, M. Sakurai, T. Maruyama, D. Motoki, Y. Itow, H. Ohsumi, S. Tasaka, S.B. Kim, Y.D. Kim, J.I. Lee, S.H. Moon, Y. Urakawa, M. Uchino, and Y. Kamioka

Subjects
Physics, Physics - Instrumentation and Detectors, Dark matter, Krypton, FOS: Physical sciences, chemistry.chemical_element, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), law.invention, Xenon, chemistry, law, Atomic physics, Distillation
Abstract

A high performance distillation system to remove krypton from xenon was constructed, and a purity level of Kr/Xe = $\sim 3 \times 10^{-12}$ was achieved. This development is crucial in facilitating high sensitivity low background experiments such as the search for dark matter in the universe., Comment: 15 pages, 11 figures

Published
2009

42. Uniformity of drug content during pharmaceutical dry granulating by roller compaction and tableting processes

Author

A. Ito, Hisakazu Sunada, Maria Yoshida, and Y. Takeuchi

Subjects
Microcrystalline cellulose, chemistry.chemical_compound, Tableting, Granulation, Materials science, chemistry, Compaction, Mixing (process engineering), Pharmaceutical Science, Magnesium stearate, Lubricant, Composite material, Dosage form
Abstract

Purpose : To evaluate the usefulness of dry granulation by roller compaction in pharmaceutical tableting processes. Methods: Acetaminophen (AAP) as a model drug, lactose, corn starch, microcrystalline cellulose as excipients and magnesium stearate (MgSt) as a lubricant were used. Granules were prepared with a roller compactor and a mill, and then tablets were compacted with a rotary tableting machine. Uniformity of drug content in flakes, granules and tablets was examined with HPLC. Hardness, weight and disintegration time of tablets were also examined. Results: Tablet hardness increased with increasing compression pressure and with decreasing content of AAP. With low AAP content, tablet hardness increased with increasing roll pressure. With high content of AAP, tablet hardness decreased with increasing roll pressure. Disintegration times were also affected by compression pressure, AAP content and roll pressure. High roll pressure prolonged the disintegration time with low AAP content, but did not prolong the disintegration time with high AAP content. The coefficients of variance for AAP content averages of granules were clearly lower than those for flakes, and those for tablets were lower than those for granules. The coefficients of variance for 0.1% AAP tablets were relatively higher than those for other formulations, although the values were still low enough. Conclusion: The uniformity of drug content was highest in tablet form, showing that uniformity progressed with granulating, milling, mixing with lubricant and tableting. The tableting process with roller compaction can produce AAP tablets with sufficient content uniformity.

Published
2009

43. Scintillation yield of liquid xenon at room temperature

Author

K. Ueshima, K. Abe, T. Iida, M. Ikeda, K. Kobayashi, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, Y. Nakajima, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takeuchi, M. Yamashita, K. Kaneyuki, T. Doke, Y. Ebizuka, J. Kikuchi, A. Ota, S. Suzuki, T. Takahashi, H. Hagiwara, T. Kamei, K. Miyamoto, T. Nagase, S. Nakamura, Y. Ozaki, T. Sato, Y. Fukuda, K. Nishijima, M. Sakurai, T. Maruyama, D. Motoki, Y. Itow, H. Ohsumi, S. Tasaka, S.B. Kim, Y.D. Kim, J.I. Lee, and S.H. Moon

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Instrumentation and Detectors (physics.ins-det), Scintillator, Nuclear physics, Xenon, chemistry, Yield (chemistry), Double beta decay, High Energy Physics::Experiment, Light emission, Instrumentation, Intensity (heat transfer)
Abstract

The intensity of scintillation light emission from liquid xenon at room temperature was measured. The scintillation light yield at 1 deg. was measured to be 0.64 +/- 0.02 (stat.) +/- 0.06 (sys.) of that at -100 deg. Using the reported light yield at -100 deg. (46 photons/keV), the measured light yield at 1 deg. corresponds to 29 photons/keV. This result shows that liquid xenon scintillator gives high light yield even at room temperature., Comment: 16pages,12figures

Published
2008

44. Large area VHF plasma production by a balanced power feeding method

Author

Y. Takeuchi, T. Shioya, Yasuhiro Yamauchi, Hiromu Takatsuka, Yoshinobu Kawai, Hiroshi Muta, and Tatsuyuki Nishimiya

Subjects
Electron density, Chemistry, business.industry, technology, industry, and agriculture, Metals and Alloys, Analytical chemistry, Surfaces and Interfaces, Plasma, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Power (physics), symbols.namesake, law, Solar cell, Materials Chemistry, symbols, Optoelectronics, Langmuir probe, Electron temperature, Plasma diagnostics, Thin film, business
Abstract

We developed a VHF plasma source using a balanced power feeding method and investigated the characteristics of the VHF plasma with the Langmuir probe. It was found that the new VHF plasma source provides higher electron density plasma that is favorable for increasing the deposition rate of microcrystalline silicon films.

Published
2008

45. Study of TeV neutrinos with upward showering muons in Super-Kamiokande

Author

C. W. Walter, R. Wendell, R. Svoboda, T. Ishizuka, S. Yamada, T. Sasaki, M. Yoshida, H. G. Berns, M. B. Smy, Y. Furuse, K. Kaneyuki, C. Saji, Masashi Yokoyama, R. Terri, A. Minamino, J. Dunmore, Takaaki Kajita, Y. Totsuka, K. Iida, M. Koshiba, Y. Oyama, B. S. Yang, Y. Choi, K. Ishihara, T. J. Haines, T. Sato, D. W. Liu, Haruki Watanabe, Masato Shiozawa, N. Tamura, H. Nishino, I. Kato, Lawrence Sulak, J. L. Raaf, J. L. Stone, S. Mine, Y. Takeuchi, Atsushi Takeda, E. Kearns, S. T. Clark, C. Ishihara, Shantanu Desai, Kunio Inoue, M. Sugihara, H. Ishii, C. K. Jung, T. Ishida, M. Swanson, K. Abe, T. Kobayashi, K. Nishikawa, T. Nakaya, T. Nakadaira, Yusuke Koshio, K. Nitta, J. Yoo, S. Yamamoto, Kate Scholberg, J. Y. Kim, C. McGrew, M. R. Vagins, C. Yanagisawa, K. Kobayashi, Y. Obayashi, K. Washburn, W. E. Keig, M. Hasegawa, Shigetaka Moriyama, S. Likhoded, G. Mitsuka, K. Ueshima, I. S. Jeong, M. Sakuda, Y. Hayato, R. Gran, T. Hasegawa, F. Dufour, I. T. Lim, H. K. Seo, A. K. Ichikawa, J. S. Jang, T. Tanaka, D. Kielczewska, Y. Kuno, K. Nishijima, S. Nakayama, M. Ishitsuka, N. Tanimoto, S. Tasaka, H. Okazawa, R. J. Wilkes, W. Wang, Masayuki Nakahata, Alec Habig, T. Koike, B. Hartfiel, Y. Takenaga, K. Okumura, Y. Fukuda, Y. Idehara, K. S. Ganezer, M. Miura, Hirokazu Ishino, M. D. Messier, C. Regis, J. Kameda, Katsuki Hiraide, S. Dazeley, J. P. Cravens, T. Ishii, H. Sato, Y. Gando, J. Hill, Yasunari Suzuki, S. Matsuno, G. Guillian, A. T. Suzuki, H. W. Sobel, Eric Thrane, M. Fechner, Y. Watanabe, W. R. Kropp, S. B. Kim, A. Clough, David William Casper, C. Mitsuda, H. Ogawa, K. K. Shiraishi, I. Higuchi, J. G. Learned, H. Maesaka, M. Goldhaber, T. Kato, Yoshitaka Itow, S. Hatakeyama, K. Nakamura, and A. Sarrat

Subjects
Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, Astronomy and Astrophysics, High Energy Physics - Experiment, Nuclear physics, Pair production, WIMP, High Energy Physics::Experiment, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Super-Kamiokande, Neutrino oscillation, Zenith
Abstract

A subset of neutrino-induced upward through-going muons in the Super-Kamiokande detector consists of high energy muons which lose energy through radiative processes such as bremsstrahlung, e^{+} e^{-} pair production and photonuclear interactions. These ``upward showering muons'' comprise an event sample whose mean parent neutrino energy is approximately 1 TeV. We show that the zenith angle distribution of upward showering muons is consistent with negligible distortion due to neutrino oscillations, as expected of such a high-energy neutrino sample. We present astronomical searches using these high energy events, such as those from WIMP annihilations in the Sun, Earth and Galactic Center, some suspected point sources, as well as searches for diffuse flux from the interstellar medium., Comment: Submitted for publication to Astroparticle Physics. Fig 12 has slightly higher resolution in the version submitted to the journal

Published
2008

46. Evolution of predator–prey systems described by a Lotka–Volterra equation under random environment

Author

Nguyen Huu Du, Kazunori Sato, N. T. Hieu, and Y. Takeuchi

Subjects
Rest (physics), Applied Mathematics, Lotka–Volterra equations, Mathematical analysis, Telegraph noise, Compact space, Predator–prey model, Dissipative system, Trajectory, Quantitative Biology::Populations and Evolution, Probability distribution, Point (geometry), Lotka–Volterra equation, Analysis, Mathematics, Deterministic system
Abstract

In this paper, we consider the evolution of a system composed of two predator–prey deterministic systems described by Lotka–Volterra equations in random environment. It is proved that under the influence of telegraph noise, all positive trajectories of such a system always go out from any compact set of int R + 2 with probability one if two rest points of the two systems do not coincide. In case where they have the rest point in common, the trajectory either leaves from any compact set of int R + 2 or converges to the rest point. The escape of the trajectories from any compact set means that the system is neither permanent nor dissipative.

Published
2006
Full Text
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47. A search for t→τνq in tt¯ production

Author

R. G. Wagner, I. Zaw, S. H. Chuang, J. E. Garcia, S. Zucchelli, R. E. Blair, F. Rimondi, B. Whitehouse, Viktor Veszpremi, S. Y. Jun, P. F. Loverre, Andrew D. Hamilton, M. Garcia Sciveres, M. E. Convery, S. Baroiant, Robin Erbacher, W-M. Yao, A. Attal, K. Kordas, A. Rakitin, Keunchang Cho, Maxwell Chertok, Min Soo Kim, Alexander Paramonov, Sheng Wang, R. Lefèvre, Stefano Belforte, Massimo Casarsa, B. F. L. Ward, Frank Chlebana, Jay Hauser, M. Giunta, R. Vidal, Nuno Leonardo, M. J. Shochet, Robert Snihur, A. Pronko, E. Gerchtein, Ivan-Kresimir Furic, S. Donati, Y. Gotra, Fumihiko Ukegawa, G. Piacentino, J. S. Suh, Henrik Jeldtoft Jensen, A. Rahaman, H. H. Williams, Thomas Andrew Schwarz, Jay Dittmann, D. Cauz, D. Hirschbuehl, Louis Lyons, G. Introzzi, J. Sjolin, S. Levy, C. M. Ginsburg, A. Loginov, Alberto Belloni, M. J. Kim, Marjorie Shapiro, Tracey Berry, V. Papadimitriou, J. M. Heuser, Michele Gallinaro, A. Gibson, A. N. Sisakyan, D. McGivern, Riccardo Paoletti, J. Strologas, L. Ristori, Chris Hays, V. Necula, P. Sinervo, C. Wolfe, J. Lee, G. De Lentdecker, Elliot Lipeles, P. F. Shepard, S. H. Oh, Markus Klute, Jonas Rademacker, A. B. Wicklund, A. J. Martin, Joel Goldstein, E. Ben-Haim, T. Walter, Koji Yamamoto, Y. Shon, P. K. Teng, S. Miscetti, P. Mack, R. Culbertson, A. Miyamoto, Tiehui Liu, T. L. Watts, W. Badgett, Andrew Beretvas, Beate Heinemann, B. T. Huffman, Peter Wittich, E. E. Schmidt, D. Stentz, D. Dagenhart, Peter Wagner, S. Tourneur, U. K. Yang, N. Goldschmidt, Jane Nachtman, L. Pondrom, E. Wicklund, Salvatore Rappoccio, J. P. Fernandez, Nicola Bacchetta, Jason Nielsen, S. W. Lee, D. Sherman, D. Naumov, A. Papikonomou, A. Heijboer, D. E. Pellett, E. Brubaker, Reisaburo Tanaka, J. Budagov, G. Chiarelli, J. N. Bellinger, Y. Takeuchi, F. Happacher, H. Matsunaga, W. Ashmanskas, P. Squillacioti, Kazuhiko Hara, A. Skiba, J. Miles, M. Donega, M. Shimojima, F. Bedeschi, Andrew Mehta, Jacobo Konigsberg, Petra Merkel, C. Mills, Dario Bisello, Young Do Oh, T. Suzuki, C. Sanchez, G. Bellettini, Dean Hidas, A. Bhatti, H. Bachacou, Itsuo Nakano, I. Fedorko, M. M. Deninno, M. Coca, M. Rescigno, A. G. Clark, Jian Zhou, Sally Seidel, K. Ikado, A. Artikov, Antonio Boveia, Carsten Rott, P. DiTuro, M. Feindt, Amitabh Lath, A. Sill, S. H. Chang, S. Waschke, V. Martin, O. Saltó, R. Kephart, P. Murat, Andreas Warburton, A. Cruz, Alan Garfinkel, V. V. Glagolev, P. Schlabach, X. Zhang, A. E. Kreymer, A. Foland, P. H. Chu, F. Prakoshyn, J. D. Lewis, R. L. Lander, K. Ebina, J. Beringer, K. T. Pitts, Jahred Adelman, Thomas LeCompte, A. Sidoti, J. S. Miller, Kevin Burkett, S. DaRonco, N. Moggi, Stanley Lai, Jochen Jens Heinrich, A. Hocker, L. R. Flores-Castillo, B. A. Barnett, A. Barbaro-Galtieri, S. Behari, F. Ptohos, J. Boudreau, N. Miladinovic, L. Nodulman, C. Dörr, Robert M Harris, Maria Agnese Ciocci, Giorgio Apollinari, F. Semeria, C. Pagliarone, J. Spalding, Matthew Herndon, W. J. Robertson, P. McIntyre, Ilya Kravchenko, G. Veramendi, Y. Fujii, S. Nahn, S. Bourov, O. Poukhov, L. Sexton-Kennedy, G. W. Foster, B. Parks, James Russ, Kohei Yorita, J. Piedra, Stephan Lammel, Lucio Cerrito, J. Yamaoka, T. R. Junk, Masaaki Tanaka, V. Boisvert, W. C. Wester, Mark Kruse, Alison Lister, R. Oldeman, D. Glenzinski, Tetsuo Arisawa, Pierre Savard, A. J. Slaughter, C. Dionisi, S. Leone, T. Maruyama, S. Rolli, Benjamin Kilminster, Teruki Kamon, H. S. Budd, J. Insler, P. B. Renton, Alberto Annovi, F. Ratnikov, R. F. Harr, K. Chung, Julien Donini, Y. Kusakabe, M. Soderberg, Rachid Mazini, R. McNulty, M. Hare, M. Mulhearn, C. P. Marino, E. Rogers, A. Soha, S. Uozumi, Shin-Shan Yu, D. Ambrose, J. Patrick, Virgil E Barnes, R. J. Miller, V. Khotilovich, Craig Blocker, Y. Seiya, Paul Tipton, Barry Blumenfeld, M. Aoki, M. Jones, D. J. Kong, A. Mukherjee, J. Lys, Maxim Goncharov, T. Okusawa, R. Roser, Ivan Vila, Y. Kemp, P. Lukens, M. Tecchio, T. Nigmanov, V. Rusu, G. Manca, A. Sukhanov, M. Martin, D. De Pedis, J. E. Kim, Kaori Maeshima, K. Giolo, R. E. Hughes, Andrea Castro, M. Campbell, R. Tsuchiya, M. Rossi, Julia Thom, M. E. Mattson, C.-S. Lin, T. Wright, S. Grinstein, Andrea Bocci, D. MacQueen, H. Gerberich, Kenneth Bloom, K. K. Joo, J. Galyardt, David Saltzberg, P. Mazzanti, T. Akimoto, Tommaso Dorigo, Petar Maksimovic, D. Amidei, A. T. Goshaw, S. Demers, P. Giannetti, J. Efron, Daijin Kim, N. Van Remortel, F. Spinella, T. Tomura, G. Bauer, S. Kwang, J. Deng, A. Varganov, M. Gold, R. Handler, B. Reisert, W. T. Fedorko, S. Pashapour, Y. S. Chung, F. D. Snider, M. Milnik, B. R. Ko, N. Krumnack, A. Menzione, E. Palencia, S. Torre, Aurore Savoy-Navarro, B. Knuteson, D. Smirnov, S. Tkaczyk, David Stuart, D. Usynin, J. Huston, K. Osterberg, K. Copic, S. R. Hahn, A. Staveris-Polykalas, G. Giurgiu, R. G. Feild, M. Dell'Orso, Mark Neubauer, Subir Sarkar, Helen Hayward, R. Vilar, P. J. Bussey, S. Cabrera, J. Petruccelli, M. Karagoz-Unel, Daniel Whiteson, M. Tönnesmann, F. Azfar, F. Zetti, G. Cortiana, Kevin Lannon, A. Dominguez, R. St. Denis, S. R. Hou, S. Errede, C. S. Lin, T. Yamashita, S. Sabik, J. Antos, U. Kerzel, Roger Moore, R. Madrak, R. Orava, Andrew Ivanov, M. Martinez, Ramon Miquel, A. S. Thompson, Inhee Cho, S. Wolbers, D. Lucchesi, Bernd Stelzer, P. Wilson, E. Vataga, Konstanty Sumorok, P. Movilla Fernandez, A. Connolly, Guenakh Mitselmakher, M. H. Kirby, D. O. Litvintsev, Guillelmo Gomez-Ceballos, K. Rinnert, G. P. Yeh, S. De Cecco, Christina Mesropian, Kenichi Hatakeyama, G. Lungu, J. Proudfoot, H. Saarikko, Eva Halkiadakis, Daniela Bortoletto, P. E. Karchin, D. Ryan, J. P. Chou, A. Sedov, D. W. Gerdes, J. Kang, Manfred Paulini, Manuela Campanelli, I. Shreyber, Tony Liss, Vyacheslav Krutelyov, C. Paus, M. Franklin, R. D. Field, Chen Yang, P. F. Derwent, Matteo Cavalli-Sforza, B. Jayatilaka, A. Vaiciulis, Vladimir Rekovic, Sofia Vallecorsa, S. Menzemer, A. Napier, J-F. Arguin, Frank Würthwein, Andrea Messina, Teresa Rodrigo, K. Anikeev, Aidan Robson, D. P. Benjamin, S. H. Kim, D. Errede, J. Pursley, R. L. Wagner, G. Punzi, M. Loreti, Javier Cuevas, C. S. Hill, A. Ruiz, S. Budd, P. Dong, R. Lysak, L. E. Kirsch, Yc Liu, A. Abulencia, T. J. Phillips, Sam Harper, Michael Schmitt, Ricardo Eusebi, J. C. Yun, K. Goulianos, M. Lancaster, A. Kovalev, S. M. Wynne, Saverio D'Auria, J. R. Smith, T. Ogawa, M. Iori, Paolo Azzurri, M. von der Mey, S. Richter, Michal Kreps, K. Terashi, Nicola Turini, Y. Kato, V. Bartsch, J. Guimaraes Da Costa, Oliver Stelzer-Chilton, A. Scribano, A. T. Laasanen, D. Tonelli, T. Affolder, S. Amerio, G. Flanagan, Yongsun Kim, G. Latino, F. Margaroli, K. Takikawa, J. Ehlers, S. Forrester, Marc Weber, W. K. Sakumoto, Paul Lujan, Gervasio Gomez, M. P. Schmidt, J. Conway, M. Hennecke, Y. C. Chen, I. V. Gorelov, M. A. Houlden, L. Santi, G. Pope, B. Y. Han, R. Mumford, M. Ciljak, C. Grosso-Pilcher, I. Lazzizzera, A. Anastassov, F. Scuri, S. Lami, D. Waters, Igor Sfiligoi, R. Carosi, Th. Müller, M. J. Morello, H. Sun, L. Demortier, P. de Barbaro, Rong-Shyang Lu, S. Somalwar, Reda Tafirout, V. Sorin, K. Sliwa, Luca Scodellaro, S. Dube, C. Plager, S. Klimenko, D. Cyr, K. L. Byrum, Jim Freeman, Koji Sato, V. Tiwari, Anna Zanetti, Andrey Korytov, Joe Incandela, R. Marginean, J. Kraus, D. Toback, Stefano Giagu, S. Carron, F. Canelli, C. I. Ciobanu, Gino Bolla, Duncan Carlsmith, P. Azzi-Bacchetta, P. Catastini, G. Busetto, Tara Shears, Rainer Wallny, D. Torretta, M. Binkley, Laurent Vacavant, G. Velev, B. Brau, S. B. Kim, M. G. Albrow, C. Bromberg, A. Deisher, E. Lytken, P. McNamara, I. Vollrath, Sinead Farrington, X. Portell, Alexei Safonov, Z. Wan, C. Haber, O. Norniella, B. D. Cooper, R. Takashima, T. Unverhau, J. W. Chapman, A. Bodek, M. Stanitzki, E. James, Y. Ishizawa, L. Zanello, Alessandro Cerri, S. E. Kuhlmann, A. Gajjar, G. Chlachidze, T. Vickey, Christopher Neu, J. Yoh, E. J. Jeon, H. Kobayashi, Joe Kroll, Monica D'Onofrio, K. S. McFarland, A. L. Scott, S. Tether, M. Bishai, J. Mülmenstädt, T. Scheidle, Avraham Yagil, H. C. Fang, A. Canepa, MarioPaolo Giordani, Ulysses Grundler, A. Taffard, G. Salamanna, M. Lindgren, A. Bolshov, Darin Acosta, Tomoko Yoshida, Kristian Allan Hahn, M. Griffiths, N. Pounder, A. Gresele, S. Tsuno, A. Holloway, B. Mohr, M. J. Wang, T. Miao, D. Chokheli, K. Li, S. Worm, William Trischuk, Aldo Penzo, Daniel Jeans, K. Kondo, G. Pauletta, D. W. Jang, K. Gibson, Xin Wu, I. Yu, W. H. Chung, N. S. Lockyer, E. Thomson, Roberto Rossin, A. Semenov, D. Clark, B. Iyutin, Wolfgang Wagner, K. Tollefson, O. González, A. V. Kotwal, S. C. Hsu, Hanbit Kim, C. Lecci, Igor Volobouev, M. Cordelli, and Brian L Winer

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Top quark, Antiparticle, Luminosity (scattering theory), 010308 nuclear & particles physics, Tevatron, 01 natural sciences, Nuclear physics, Particle decay, 0103 physical sciences, Center of mass, Neutrino, 010306 general physics, Lepton
Abstract

We present a search for t t ¯ events with a tau lepton in the final state. The data sample corresponds to an integrated luminosity of 194 pb −1 collected with the CDF II detector from p p ¯ collisions at a center of mass energy of 1.96 TeV. We observe two events with an expected signal of 1.0 ± 0.2 events and a background of 1.3 ± 0.3 events. We determine a 95% confidence level upper limit on r τ , the ratio of the measured rate of t → τ ν q to the expectation, of 5.2.

Published
2006

48. Inhibiting effect of tea catechins on the lipid peroxidation induced in tritiated water

Author

M. Kubota, Y. Takeuchi, K. Okuno, and H. Yoshioka

Subjects
Liposome, Tritiated water, Mechanical Engineering, Catechin, Partition coefficient, Spin probe, Lipid peroxidation, chemistry.chemical_compound, Nuclear Energy and Engineering, chemistry, Phosphatidylcholine, General Materials Science, Hydroxyl radical, Civil and Structural Engineering, Nuclear chemistry
Abstract

Lipid peroxidation induced by β-ray in tritiated water and the inhibiting effect of tea catechins on it were studied using a spin probe method. A hydrophobic spin probe, 16-doxylstearic acid (16NS), was incorporated into a liposome prepared from egg yolk phosphatidylcholine, which was dispersed in tritiated water; the catechins were added to the solution. The rate of the decrease of ESR intensity of 16NS was a measure of the peroxidation and of the inhibiting effect. Inhibiting activity increased with an increase in the concentration of the catechin. Inhibiting ability estimated from the slope of the curves was in the order of (−)-epicatechin gallate > (−)-epigallocatechin gallate > (−)-epicatechin > (−)-epigallocatechin. The activity decreased with increasing temperature and the temperature dependence increased with the catechin concentration. These results were explained by a model; the initiator of the peroxidation is the hydroxyl radical (OH) and catechin is adsorbed on the surface of the membrane and scavenges OH coming into there from the water phase. The activity depended on the ratio of the adsorbed catechin, namely the partition coefficient between the water and the lipid.

Published
2006

49. Production of large area VHF plasma using ladder-shaped electrode

Author

Y. Takeuchi, Hiromu Takatsuka, T. Shioya, Yoshinobu Kawai, and Yasuhiro Yamauchi

Subjects
Materials science, Plasma parameters, Analytical chemistry, Surfaces and Interfaces, General Chemistry, Plasma, Condensed Matter Physics, Surfaces, Coatings and Films, Ion, symbols.namesake, Saturation current, Electrode, Materials Chemistry, Gas plasma, symbols, Electron temperature, Langmuir probe
Abstract

A VHF SiH 4 /H 2 plasma was produced using a ladder-shaped electrode of 1200 mm×141 mm. In this case, VHF power up to 200 W was fed to the ladder-shaped electrode through the matching box. The plasma parameters in mixture gas plasma of SiH 4 /H 2 were measured with a heated Langmuir probe and examined as a function of gas mixture rate. A uniform VHF plasma was achieved over 1 m at the frequency of 60 MHz. Furthermore, when the concentration of SiH 4 gas was increased, the ion saturation current decreased while the electron temperature increased.

Published
2005

50. Development of a soft X-ray magnetic circular dichroism spectrometer using a 1.9 T electromagnet at BL25SU of SPring-8

Author

Tomohiro Matsushita, Takanori Wakita, Takayuki Muro, T. Hirono, Y. Takeuchi, Tetsuya Nakamura, Fang Zhun Guo, and K. Kobayashi

Subjects
Physics, Radiation, Electromagnet, Condensed matter physics, Spectrometer, business.industry, Magnetic circular dichroism, SPring-8, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, Magnetization, Optics, X-ray magnetic circular dichroism, law, Physical and Theoretical Chemistry, Thin film, business, Spectroscopy
Abstract

A soft X-ray magnetic circular dichroism (SXMCD) spectrometer system using a water-cooled electromagnet of 1.9 T has been installed at BL25SU of SPring-8. The purpose is to develop an optimized system for element specific magnetization (ESM) measurements by means of SXMCD. A combination between the variable magnetic field and the helicity switching technique using the twin helical undulators gives a great advantage for measuring precise ESM loops. The present system is especially useful for investigations of magnetic properties on multi-layered thin films and ultra-thin films in addition to multi-elements alloys and compounds.

Published
2005

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