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题名: Measurements of branching fractions for b -& K pi and b -&pi pi decays
刊名: PHYSICAL REVIEW LETTERS
出版日期: 2007
卷号: 99, 期号:12, 页码:121601通讯作者: Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
Chiba Univ, Chiba, Japan
Univ Cincinnati, Cincinnati, OH 45221 USA
Fu Jen Catholic Univ, Dept Phys, Taipei, Taiwan
Grad Univ Adv Studies, Hayama, Japan
Gyeongsang Natl Univ, Chinju, South Korea
Hanyang Univ, Seoul 133791, South Korea
Univ Hawaii, Honolulu, HI 96822 USA
KEK, Tsukuba, Ibaraki, Japan
Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China
Inst High Energy Phys, Vienna, Austria
Inst High Energy Phys, Protvino, Russia
Inst Theoret & Expt Phys, Moscow 117259, Russia
Jozef Stefan Inst, Ljubljana, Slovenia
Kanagawa Univ, Yokohama, Kanagawa, Japan
Korea Univ, Seoul 136701, South Korea
Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland
Univ Ljubljana, Ljubljana, Slovenia
Univ Maribor, SLO-2000 Maribor, Slovenia
Univ Melbourne, Parkville, Vic 3052, Australia
Nagoya Univ, Nagoya, Aichi, Japan
Nara Womens Univ, Nara 630, Japan
Natl Cent Univ, Chungli 32054, Taiwan
H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
Nippon Dent Univ, Niigata, Japan
Niigata Univ, Niigata, Japan
Univ Nova Gorica, Nova Gorica, Slovenia
Osaka City Univ, Osaka 558, Japan
Osaka Univ, Osaka, Japan
Panjab Univ, Chandigarh 160014, India
Peking Univ, Beijing 100871, Peoples R China
Princeton Univ, Princeton, NJ 08544 USA
RIKEN BNL Res Ctr, Upton, NY 11973 USA
Saga Univ, Saga 840, Japan
Univ Sci & Technol China, Hefei 230026, Peoples R China
Seoul Natl Univ, Seoul, South Korea
Shinshu Univ, Nagano, Japan
Sungkyunkwan Univ, Suwon, South Korea
Univ Sydney, Sydney, NSW 2006, Australia
Toho Univ, Funabashi, Chiba 274, Japan
Tohoku Gakuin Univ, Tagajo, Miyagi, Japan
Tohoku Univ, Sendai, Miyagi 980, Japan
Univ Tokyo, Dept Phys, Tokyo 113, Japan
Tokyo Inst Technol, Tokyo 152, Japan
Tokyo Metropolitan Univ, Tokyo 158, Japan
Tokyo Univ Agr & Technol, Tokyo, Japan
Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
Yonsei Univ, Seoul 120749, South Korea
Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
Budker Inst Nucl Phys, Novosibirsk 630090, Russia
英文摘要: We report measurements of branching fractions for B -> K pi and B ->pi pi decays based on a data sample of 449x10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We also measure the ratios of partial widths for B -> K pi decays, namely R-c equivalent to 2 Gamma(B+-> K+pi(0))/Gamma(B+-> K-0 pi(+))=1.08 +/- 0.06 +/- 0.08 and R-n equivalent to Gamma(B-0 -> K+pi(-))/2 Gamma(B-0 -> K-0 pi(0))=1.08 +/- 0.08 +/- 0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributi the new measurements are, however, consistent with standard model expectations.
类目[WOS]: Physics, Multidisciplinary
研究领域[WOS]: Physics
语种: 英语
WOS记录号: WOS:019
Citation statistics:
内容类型: 期刊论文
URI标识: []&&
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作者单位: 中国科学院高能物理研究所
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Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.&贝类壳-体质量比和静水沉降特性的相关性-Correlation between shell-body mass ratio and hydrostatic settling characteristics of mollusc species
<meta name="Description" content="软体动物贝壳表型是适应性进化的结果，为探究贝壳形态特性与软体动物随水流扩散功能的相关性，本实验选取9种具代表性的腹足纲和双壳纲贝类作为研究对象，研究了其成体的壳-体质量比与静水沉降特性及二者的相关性。结果表明：体质量的变异系数（C.V.=1.11）大于壳长（C.V.=0.67）、壳宽（C.V.=0.54）的变异系数；壳-体质量比具较强的种属特异性，种内变异系数小（C.V.=0.20），而种间差异极显著（P<0.01）受试贝类的平均壳-体质量比为0.32±0.13，陆生贝类的壳-体质量比显著小于水生贝类（P<0.01），壳-体质量比最大的河蚬（0.54±0.06）是最小的非洲大蜗牛（0.17±0.04）的3倍，福寿螺的壳-体质量比为0.50±0.06。双壳类和螺类的沉降行为差异明显，只有中华园田螺、铜锈环棱螺和河蚬不能在静水中漂浮；沉降速度最大的河蚬（（24.99±4.22） cm/s）是最小的椭圆萝卜螺（（4.13±0.96） cm/s）的6倍，入侵种非洲大蜗牛（（18.30±3.64） cm/s）和福寿螺（（21.77±5.23） cm/s）与土著种铜锈环棱螺（（19.48±3.14） cm/s）和中华园田螺（（21.44±3.92） cm/s）在沉降速度上无显著差异（P<0.01）。成体贝类的壳-体质量比与沉降速度（R2=0.28）、沉降加速度（R2=0.39）之间存在一定的相关性。在此基础上，贝类沉降特性随生活史变化的研究将进一步揭示贝类进化与种群扩散中的生态水力学作用。;Shell phenotype is the result of adaptive evolution in molluscs. In order to explore the specificity of shell phenotype and its relationship with eco-hydraulics, this study examined the shell-body mass ratio and the hydrostatic settling characteristics of nine mollusc species, as well as their interspecific differences and correlations. The results showed that body mass (C.V.=1.11) was the most significant morphological index, compared to shell length (C.V.=0.67) and shell width (C.V.=0.54). The shell-body mass ratio differed significantly between species (P<0.01), however, with a small variation coefficient (C.V.=0.20). The average shell-body mass ratio was 0.32 ± 0.13, and was significantly smaller in terrestrial molluscs than in aquatic molluscs (P
说明：此论文已被《生态学报》录用，现已优先出版，可查看文章PDF版本！
罗渡,汪学杰,徐猛,顾党恩,牟希东,韦慧,杨叶欣,Cesar G. Demayo,胡隐昌.贝类壳-体质量比和静水沉降特性的相关性.生态学报,2018,(18).http://dx.doi.org/[doi]
贝类壳-体质量比和静水沉降特性的相关性
Correlation between shell-body mass ratio and hydrostatic settling characteristics of mollusc species
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基金项目：国家自然科学基金()；农业部外来生物入侵防治项目(2130108)；广东省自然科学基金(45)
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软体动物贝壳表型是适应性进化的结果，为探究贝壳形态特性与软体动物随水流扩散功能的相关性，本实验选取9种具代表性的腹足纲和双壳纲贝类作为研究对象，研究了其成体的壳-体质量比与静水沉降特性及二者的相关性。结果表明：体质量的变异系数（C.V.=1.11）大于壳长（C.V.=0.67）、壳宽（C.V.=0.54）的变异系数；壳-体质量比具较强的种属特异性，种内变异系数小（C.V.=0.20），而种间差异极显著（P<0.01）受试贝类的平均壳-体质量比为0.32±0.13，陆生贝类的壳-体质量比显著小于水生贝类（P<0.01），壳-体质量比最大的河蚬（0.54±0.06）是最小的非洲大蜗牛（0.17±0.04）的3倍，福寿螺的壳-体质量比为0.50±0.06。双壳类和螺类的沉降行为差异明显，只有中华园田螺、铜锈环棱螺和河蚬不能在静水中漂浮；沉降速度最大的河蚬（（24.99±4.22） cm/s）是最小的椭圆萝卜螺（（4.13±0.96） cm/s）的6倍，入侵种非洲大蜗牛（（18.30±3.64） cm/s）和福寿螺（（21.77±5.23） cm/s）与土著种铜锈环棱螺（（19.48±3.14） cm/s）和中华园田螺（（21.44±3.92） cm/s）在沉降速度上无显著差异（P<0.01）。成体贝类的壳-体质量比与沉降速度（R2=0.28）、沉降加速度（R2=0.39）之间存在一定的相关性。在此基础上，贝类沉降特性随生活史变化的研究将进一步揭示贝类进化与种群扩散中的生态水力学作用。
Shell phenotype is the result of adaptive evolution in molluscs. In order to explore the specificity of shell phenotype and its relationship with eco-hydraulics, this study examined the shell-body mass ratio and the hydrostatic settling characteristics of nine mollusc species, as well as their interspecific differences and correlations. The results showed that body mass (C.V.=1.11) was the most significant morphological index, compared to shell length (C.V.=0.67) and shell width (C.V.=0.54). The shell-body mass ratio differed significantly between species (P<0.01), however, with a small variation coefficient (C.V.=0.20). The average shell-body mass ratio was 0.32 ± 0.13, and was significantly smaller in terrestrial molluscs than in aquatic molluscs (P<0.01). The largest shell-body mass ratio was found in Corbicula fluminea (0.54±0.06), which was more than three times that of the smallest species, Achatina fulica (0.17±0.04). The shell mass of Pomacea canaliculata was half of its body mass (0.50±0.06). The settling behavior was significantly different between bivalves and snails. Cipangopaludina cathayensis, Bellamya aeruginosa, and C. fluminea were the only three species which could not float in still water, in the present study. The fastest settling velocity of C. fluminea ((24.99±4.22) cm/s) was nearly six times that of the slowest, Radix swinhoei ((4.13±0.96) cm/s). Settling velocity and settling acceleration did not differ significantly between the invasive snails A. fulica ((18.30±3.64) cm/s) and P. canaliculata ((21.77±5.23) cm/s), and the native snails B. aeruginosa ((19.48±3.14) cm/s) and C. cathayensis ((21.44±3.92 cm/s). Shell-body mass ratio was correlated with settling velocity (R2=0.28) and settling acceleration (R2=0.39) in adults. Following current research, the study of settling behavior changing with life history will further reveal the role of eco-hydraulics in evolution and population expansion in molluscs.
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