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Belle Collaboration,Chen, W.T.,Abe, K.,Abe, K.,Adachi, I.,Aihara, H.,Anipko, D.,Aulchenko, V.,Bakich, A.M.,Barberio, E.,Bay, A.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Bracko, M North-Holland Pub. Co 2007 Physics letters: B Vol.651 No.1
K<SUB>S</SUB><SUP>0</SUP>K<SUB>S</SUB><SUP>0</SUP> production in two-photon collisions has been studied using a 397.6 fb<SUP>-1</SUP> data sample collected with the Belle detector at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> collider. For the first time the cross sections are measured in the two-photon center-of-mass energy range between 2.4 GeV and 4.0 GeV and angular range |cosθ<SUP>*</SUP>|<0.6. Combining the results with measurements of γγ->K<SUP>+</SUP>K<SUP>-</SUP> from Belle, we observe that the cross section ratio σ(K<SUB>S</SUB><SUP>0</SUP>K<SUB>S</SUB><SUP>0</SUP>)/σ(K<SUP>+</SUP>K<SUP>-</SUP>) decreases from ∼0.13 to ∼0.01 with increasing energy. Signals for the χ<SUB>c0</SUB> and χ<SUB>c2</SUB> charmonium states are also observed.
Observation of <sup>B+</sup>→<sup>K+</sup>ηγ
Nishida, S.,Abe, K.,Aihara, H.,Akatsu, M.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,k Elsevier 2005 Physics letters: B Vol.610 No.1
<P><B>Abstract</B></P><P>We report measurements of radiative <I>B</I> decays with Kηγ final states, using a data sample of 253 <SUP>fb−1</SUP> recorded at the ϒ(4S) resonance with the Belle detector at the KEKB <SUP>e+</SUP><SUP>e−</SUP> storage ring. We observe <SUP>B+</SUP>→<SUP>K+</SUP>ηγ for the first time with a branching fraction of (8.4±1.5(stat)−0.9+1.2(syst))×<SUP>10−6</SUP> for <SUB>MKη</SUB><2.4 GeV/<SUP>c2</SUP>, and find evidence of <SUP>B0</SUP>→<SUP>K0</SUP>ηγ. We also search for B→K3∗(1780)γ.</P>
USING ORBITAL EFFECTS TO BREAK THE CLOSE/WIDE DEGENERACY IN BINARY-LENS MICROLENSING EVENTS
Shin, I.-G.,Sumi, T.,Udalski, A.,Choi, J. Y.,Han, C.,Gould, A.,Abe, F.,Bennett, D. P.,Bond, I. A.,Botzler, C. S.,Chote, P.,Freeman, M.,Fukui, A.,Furusawa, K.,Harris, P.,Itow, Y.,Ling, C. H.,Masuda, K. IOP Publishing 2013 The Astrophysical journal Vol.764 No.1
<P>Microlensing can provide an important tool to study binaries, especially those composed of faint or dark objects. However, accurate analysis of binary-lens light curves is often hampered by the well-known degeneracy between close (s < 1) and wide (s > 1) binaries, which can be very severe due to an intrinsic symmetry in the lens equation. Here, s is the normalized projected binary separation. In this paper, we propose a method that can resolve the close/wide degeneracy using the effect of a lens orbital motion on lensing light curves. The method is based on the fact that the orbital effect tends to be important for close binaries while it is negligible for wide binaries. We demonstrate the usefulness of the method by applying it to an actually observed binary-lens event MOA-2011-BLG-040/OGLE-2011-BLG-0001, which suffers from severe close/wide degeneracy. From this, we are able to uniquely specify that the lens is composed of K- and M-type dwarfs located similar to 3.5 kpc from the Earth.</P>
Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets
Saha, P. K.,Noumi, H.,Abe, D.,Ajimura, S.,Aoki, K.,Bhang, H. C.,Dobashi, K.,Endo, T.,Fujii, Y.,Fukuda, T.,Guo, H. C.,Hashimoto, O.,Hotchi, H.,Imai, K.,Kim, E. H.,Kim, J. H.,Kishimoto, T.,Krutenkova, A American Physical Society 2004 PHYSICAL REVIEW C - Vol.70 No.4
XMASS Collaboration,Takiya, H.,Abe, K.,Hiraide, K.,Ichimura, K.,Kishimoto, Y.,Kobayashi, K.,Kobayashi, M.,Moriyama, S.,Nakahata, M.,Norita, T.,Ogawa, H.,Sekiya, H.,Takachio, O.,Takeda, A.,Tasaka, S.,Y North-Holland 2016 Nuclear Instruments & Methods in Physics Research. Vol.834 No.-
We report the measurement of the emission time profile of scintillation from gamma-ray induced events in the XMASS-I 832kg liquid xenon scintillation detector. Decay time constant was derived from a comparison of scintillation photon timing distributions between the observed data and simulated samples in order to take into account optical processes such as absorption and scattering in liquid xenon. Calibration data of radioactive sources, <SUP>55</SUP>Fe, <SUP>241</SUP>Am, and <SUP>57</SUP>Co were used to obtain the decay time constant. Assuming two decay components, τ<SUB>1</SUB> and τ<SUB>2</SUB>, the decay time constant τ<SUB>2</SUB> increased from 27.9ns to 37.0ns as the gamma-ray energy increased from 5.9keV to 122keV. The accuracy of the measurement was better than 1.5ns at all energy levels. A fast decay component with τ<SUB>1</SUB>~2ns was necessary to reproduce data. Energy dependencies of τ<SUB>2</SUB> and the fraction of the fast decay component were studied as a function of the kinetic energy of electrons induced by gamma-rays. The obtained data almost reproduced previously reported results and extended them to the lower energy region relevant to direct dark matter searches.
Abe, K.,Hieda, K.,Hiraide, K.,Hirano, S.,Kishimoto, Y.,Kobayashi, K.,Moriyama, S.,Nakagawa, K.,Nakahata, M.,Ogawa, H.,Oka, N.,Sekiya, H.,Shinozaki, A.,Suzuki, Y.,Takeda, A.,Takachio, O.,Ueshima, K.,Um North-Holland Pub. Co 2013 Physics letters: B Vol.719 No.1
A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg@?day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS excludes part of the parameter space favored by other experiments.
INTERPRETATION OF A SHORT-TERM ANOMALY IN THE GRAVITATIONAL MICROLENSING EVENT MOA-2012-BLG-486
Hwang, K.-H.,Choi, J.-Y.,Bond, I. A.,Sumi, T.,Han, C.,Gaudi, B. S.,Gould, A.,Bozza, V.,Beaulieu, J.-P.,Tsapras, Y.,Abe, F.,Bennett, D. P.,Botzler, C. S.,Chote, P.,Freeman, M.,Fukui, A.,Fukunaga, D.,Ha IOP Publishing 2013 The Astrophysical journal Vol.778 No.1
<P>A planetary microlensing signal is generally characterized by a short-term perturbation to the standard single lensing light curve. A subset of binary-source events can produce perturbations that mimic planetary signals, thereby introducing an ambiguity between the planetary and binary-source interpretations. In this paper, we present the analysis of the microlensing event MOA-2012-BLG-486, for which the light curve exhibits a short-lived perturbation. Routine modeling not considering data taken in different passbands yields a best-fit planetary model that is slightly preferred over the best-fit binary-source model. However, when allowed for a change in the color during the perturbation, we find that the binary-source model yields a significantly better fit and thus the degeneracy is clearly resolved. This event not only signifies the importance of considering various interpretations of short-term anomalies, but also demonstrates the importance of multi-band data for checking the possibility of false-positive planetary signals.</P>
Direct dark matter search by annual modulation with 2.7 years of XMASS-I data
Abe, K.,Hiraide, K.,Ichimura, K.,Kishimoto, Y.,Kobayashi, K.,Kobayashi, M.,Moriyama, S.,Nakahata, M.,Norita, T.,Ogawa, H.,Sato, K.,Sekiya, H.,Takachio, O.,Takeda, A.,Tasaka, S.,Yamashita, M.,Yang, B. American Physical Society 2018 Physical Review D Vol.97 No.10
<P>An annual modulation signal due to the Earth orbiting around the Sun would be one of the strongest indications of the direct detection of dark matter. In 2016, we reported a search for dark matter by looking for this annual modulation with our single-phase liquid xenon XMASS-I detector. That analysis resulted in a slightly negative modulation amplitude at low energy. In this work, we included more than one year of additional data, which more than doubles the exposure to 800 live days with the same 832 kg target mass. When we assume weakly interacting massive particle (WIMP) dark matter elastically scattering on the xenon target, the exclusion upper limit for the WIMP-nucleon cross section was improved by a factor of 2 to 1.9 x 10(-41) cm(2) at 8 GeV/c(2) at 90% confidence level with our newly implemented data selection through a likelihood method. For the model-independent case, without assuming any specific dark matter model, we obtained more consistency with the null hypothesis than before with a p-value of 0.11 in the 1-20 keV energy region. This search probed this region with an exposure that was larger than that of DAMA/LIBRA. We also did not find any significant amplitude in the data for periodicity with periods between 50 and 600 days in the energy region between 1 to 6 keV.</P>
Satoyama, N.,Abe, K.,Adachi, I.,Aihara, H.,Anipko, D.,Bakich, A.M.,Barberio, E.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T.E.,Chang, M.-C.,Chang, P.,Ch Elsevier 2007 Physics letters: B Vol.647 No.2
<P><B>Abstract</B></P><P>We present a search for the decays <SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB> and <SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB> in a 253 fb<SUP>−1</SUP> data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy <I>B</I> factory. We find no significant evidence for a signal and set 90% confidence level upper limits of B(<SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB>)<1.7×<SUP>10−6</SUP> and B(<SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB>)<9.8×<SUP>10−7</SUP>.</P>
Abe, K.,Hiraide, K.,Ichimura, K.,Kishimoto, Y.,Kobayashi, K.,Kobayashi, M.,Moriyama, S.,Nakahata, M.,Norita, T.,Ogawa, H.,Sato, K.,Sekiya, H.,Takachio, O.,Takeda, A.,Tasaka, S.,Yamashita, M.,Yang, B.S Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.884 No.-
<P><B>Abstract</B></P> <P>We established a method to assay <SUP>210</SUP>Pb and <SUP>210</SUP>Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for the <SUP>210</SUP>Pb and <SUP>210</SUP>Po contaminations reaches a few mBq/kg. Due to this high sensitivity, the <SUP>210</SUP>Pb and <SUP>210</SUP>Po contaminations in oxygen free copper bulk were identified and measured for the first time. The <SUP>210</SUP>Pb contaminations of our oxygen free copper samples were 17–40 mBq/kg. Based on our investigation of copper samples in each production step, the <SUP>210</SUP>Pb in oxygen free copper was understood to be a small residual of an electrolysis process. This method to measure bulk contaminations of <SUP>210</SUP>Pb and <SUP>210</SUP>Po could be applied to other materials.</P>