观察一个新的Ξb0状态

L. C. R. Aaij, C. Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, A. A. Albero, Z. Aliouche, G. Alkhazov, P. Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. Back, S. Baker, P. Rodriguez, V. Balagura, W. Baldini, J. B. Leite, R. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti, M. Bettler, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. Bieker, S. Bifani, P. Billoir, M. Birch, F. Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.
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Bishop, A. Bizzeti, M. Bjørn, M. Blago, T. Blake, F. Blanc, S.","doi":"10.1103/physrevd.103.012004","DOIUrl":null,"url":null,"abstract":"Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $\\Xi_b^0$ resonance decaying to the $\\Xi_b^-\\pi^+$ final state is presented. The state, referred to as $\\Xi_b(6227)^0$, has a measured mass and natural width of $m(\\Xi_b(6227)^0) = 6227.1^{\\,+1.4}_{\\,-1.5}\\pm0.5$ MeV, $\\Gamma(\\Xi_b(6227)^0) = 18.6^{\\,+5.0}_{\\,-4.1}\\pm1.4$ MeV, where the uncertainties are statistical and systematic. The production rate of the $\\Xi_b(6227)^0$ state relative to that of the $\\Xi_b^-$ baryon in the kinematic region $2<\\eta<5$ and $p_{\\rm T}<30$ GeV is measured to be $\\frac{f_{\\Xi_b(6227)^0}}{f_{\\Xi_b^-}}{\\mathcal{B}}(\\Xi_b(6227)^0\\to\\Xi_b^-\\pi^+) = 0.045\\pm0.008\\pm0.004$, where ${\\mathcal{B}}(\\Xi_b(6227)^0\\to\\Xi_b^-\\pi^+)$ is the branching fraction of the decay, and $f_{\\Xi_b(6227)^0}$ and $f_{\\Xi_b^-}$ represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed $\\Xi_b(6227)^-$ state, along with the mass of the $\\Xi_b^-$ baryon, are also reported. 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引用次数: 2

摘要

利用LHCb实验收集的质子-质子碰撞数据样本,对应于8.5 fb $^{-1}$的积分光度,观察到一个新的激发$\Xi_b^0$共振衰变成$\Xi_b^-\pi^+$终态。这个状态被称为$\Xi_b(6227)^0$,它的测量质量和自然宽度为$m(\Xi_b(6227)^0) = 6227.1^{\,+1.4}_{\,-1.5}\pm0.5$ MeV, $\Gamma(\Xi_b(6227)^0) = 18.6^{\,+5.0}_{\,-4.1}\pm1.4$ MeV,其中的不确定性是统计和系统的。在运动区域$2<\eta<5$和$p_{\rm T}<30$ GeV中,相对于$\Xi_b^-$重子的$\Xi_b(6227)^0$态的产生速率测量为$\frac{f_{\Xi_b(6227)^0}}{f_{\Xi_b^-}}{\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+) = 0.045\pm0.008\pm0.004$,其中${\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+)$为衰变的分支分数,$f_{\Xi_b(6227)^0}$和$f_{\Xi_b^-}$为破碎分数。对先前观测到的$\Xi_b(6227)^-$状态的质量和自然宽度的改进测量,以及$\Xi_b^-$重子的质量,也被报道。这两种测量都比以前报告的值精确得多,并且与以前报告的值一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observation of a new Ξb0 state
Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5~fb$^{-1}$, the observation of a new excited $\Xi_b^0$ resonance decaying to the $\Xi_b^-\pi^+$ final state is presented. The state, referred to as $\Xi_b(6227)^0$, has a measured mass and natural width of $m(\Xi_b(6227)^0) = 6227.1^{\,+1.4}_{\,-1.5}\pm0.5$ MeV, $\Gamma(\Xi_b(6227)^0) = 18.6^{\,+5.0}_{\,-4.1}\pm1.4$ MeV, where the uncertainties are statistical and systematic. The production rate of the $\Xi_b(6227)^0$ state relative to that of the $\Xi_b^-$ baryon in the kinematic region $2<\eta<5$ and $p_{\rm T}<30$ GeV is measured to be $\frac{f_{\Xi_b(6227)^0}}{f_{\Xi_b^-}}{\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+) = 0.045\pm0.008\pm0.004$, where ${\mathcal{B}}(\Xi_b(6227)^0\to\Xi_b^-\pi^+)$ is the branching fraction of the decay, and $f_{\Xi_b(6227)^0}$ and $f_{\Xi_b^-}$ represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed $\Xi_b(6227)^-$ state, along with the mass of the $\Xi_b^-$ baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.
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