Measurement of the Resonant and Non-Resonant Branching Ratios in $Ξ_{c}^{0} \rightarrow Ξ^{0} K^+ K^-$
J. T. McNeil, J. Yelton, J. Bennett, I. Adachi, K. Adamczyk, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Bab… 展开作者
J. T. McNeil, J. Yelton, J. Bennett, I. Adachi, K. Adamczyk, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, M. Bessner, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bracko, T. E. Browder, M. Campajola, L. Cao, D. Cervenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. J. Cho, S. K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, R. Dhamija, F. Di Capua, Z. Dolezal, T. V. Dong, S. Eidelman, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, Y. Guan, K. Gudkova, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, W. S. Hou, C. L. Hsu, K. Huang, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, K. H. Kang, G. Karyan, H. Kichimi, B. H. Kim, C. H. Kim, D. Y. Kim, S. H. Kim, Y. K. Kim, K. Kinoshita, P. Kodys, T. Konno, S. Korpar, P. Krizan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, M. Kumar, K. Kumara, Y. J. Kwon, K. Lalwani, S. C. Lee, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mohanty, T. J. Moon, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, G. Pakhlova, S. Pardi, H. Park, S. H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Rohrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, L. Santelj, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, V. Shebalin, J. G. Shiu, F. Simon, E. Solovieva, M. Staric, Z. S. Stottler, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, Y. Tao, F. Tenchini, M. Uchida, S. Uehara, Y. Unno, S. Uno, R. Van Tonder, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, E. Wang, M. Z. Wang, P. Wang, M. Watanabe, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, H. Ye, J. H. Yin, Z. P. Zhang, V. Zhilich, V. Zhukova
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10 pages, 7 figures, 1 table, On behalf of the Belle Collaboration, Accepted by Phys. Rev. D (05/10/21) DZ12501
Using the entire data sample of $980$ $fb^{-1}$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, $W$-exchange resonant decay $Ξ_{c}^{0} \rightarrow Ξ^{0} ϕ(\to K^+ K^-)$ with a polarized $ϕ$ and the non-resonant decay via a direct process $Ξ_{c}^{0} \rightarrow Ξ^{0} K^+ K^-$. We present these measurements, relative to the normalization mode $Ξ^{-}π^{+}$, and find branching ratios $\frac{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{0} ϕ(\rightarrow K^{+}K^{-}))}{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{-} π^{+})} = 0.036 \pm 0.004 (stat.) \pm 0.002 (syst.)$ and $\frac{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{0} K^{+} K^{-})}{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{-} π^{+})} = 0.039 \pm 0.004 (stat.) \pm 0.002 (syst.)$ which suggest that only minor cusping peaks occur in the combinatorial background of $Ω^{*-} \to Ξ^{0}K^{-}$ due to these $Ξ_{c}^{0}$ decays.
Measurement of the branching fraction of $J/ψ\rightarrow ωη' π^{+}π^{-}$ and search for $J/ψ\rightarrow ωX(1835), \, X(1835) \rightarrow η' π^{+}π^{-}$ decay
Measurements of $\boldsymbol{B\rightarrow Kπ}$ and $\boldsymbol{B\rightarrow ππ}$ Branching Fractions and $\boldsymbol{\mathcal{A}_{CP}}$ Asymmetries at Belle II
Belle II 测量了多种 $B\to K\pi$ 和 $B\to\pi\pi$ 衰变的分支比及直接 CP 不对称性，通过同位旋求和规则检验标准模型，并测量了 CKM 角 $\phi_2$ 相关的衰变，结果与标准模型预期一致。
Measurement of the B^0 --> pi^-ell^+nu and B^+ --> eta^(')ell^+nu Branching Fractions, the B^0 --> pi^-ell^+nu and B^+ --> eta ell^+nu Form-Factor Shapes, and Determination of |V_{ub}|
Evidence for the decays $B^{0}\rightarrow\bar{D}^{(*)0}ϕ$ and updated measurements of the branching fractions of the $B^{0}_{s}\rightarrow\bar{D}^{(*)0}ϕ$ decays
An investigation of the very rare $K^+\rightarrowπ^+ν\barν$ decay
NA 62实验报告了对2017年在CERN SPS收集的$K^+$衰变样本中的$K^+\rightarrowπ^+ν\barν$模式的调查。实验已实现$(0.389\pm 0.024)\times10^{-10}$的单事件灵敏度，对应于假设$(8.4\pm1.0)\times10^{-11}$的标准模型分支比的2.2个事件。观察到两个信号候选者具有1.5个事件的预期背景。结合NA62对2016年记录的较小数据集进行的类似分析的结果，该合作现在报告了$K^+\rightarrowπ^+ν\barν$分支比的$1.78\times10^{-10}$上限为90\%\，CL。这与相应的$(0.48^{+0.72 }_{-0.48})\times10^{-10}$的68\%\，CL测量值一起，是目前世界上最精确的结果，并且能够约束一些新物理模型，这些模型预测了先前测量仍然允许的大增强。
New results on the search for $B^0_s\rightarrow μ^+μ^-$ from LHCb
利用LHCb实验，使用在$\sqrt s=8$收集的1.1\，fb $^{-1}$数据，对稀有衰变$B^0_s\rightarrow μ^+μ^-$和$B^0\rightarrow μ^+μ^-$进行搜索，TeV $ and 1.0\,fb$ ^{-1} $ of data collected at $ \sqrt s=7 $\,TeV. An excess of $ B^0_s \rightarrow μ^+μ^- $ candidates with respect to the background expectations is observed with a statistical significance of 3.5 standard deviations. A branching fraction of $ { \cal BR}（B^0_s \rightarrow μ^+μ^-）=（3.2^{+1.5}_{-1.2}）\times 10^{-9} $ is measured with an unbinned maximum likelihood fit. The measured branching fraction is in agreement with the expectation from the Standard Model. The observed n…
Measurement of $Ω^0_{\rm c}$ baryon production and branching-fraction ratio ${\rm BR(Ω^0_c \rightarrow Ω^- e^+ν_e)} / {\rm BR(Ω^0_c \rightarrow Ω^- π^+)}$ in pp collisions at $\sqrt{s}$ = 13 TeV
A method to measure the absolute branching fractions of $Λ_c$ decays
本文提出利用强子对撞机上大量产生的介子${B}^+ \rightarrow p π^+ π^+ \barΣ_c^{--}$及其电荷共轭$B^-$的衰变，通过强衰变$Σ_c \rightarrow Λ_c π$获得$Λ_c$重子样品。由此获得的样品不受通常由依赖于特定衰变模式的选择引入的偏差的影响。因此，它允许测量的绝对分支分数的$Λ_c$重子衰变到$ p K π$或其他可观察到的最终状态，以模型独立的方式进行。可以实现与这种方法的准确性进行了讨论，它示出，它将是竞争力或改进电流测量。
MEASUREMENT OF THE HIGGS BRANCHING RATIO BR($H\rightarrowγγ$) AT 3 TeV CLIC
在本文中，我们解决了潜在的3 TeV的质心能量紧凑型直线对撞机（CLIC）来测量希格斯玻色子衰变到两个光子的分支分数，BR（$H\rightarrowγγ$）。由于光子是无质量的，希格斯玻色子与光子的耦合是通过涉及标准模型或超越标准模型的重粒子的高阶过程实现的。任何测量到的BR（$H\rightarrowγγ$）的偏差，以及因此希格斯耦合$g_{Hγγ}$与标准模型预测的偏差，都可能表明新物理学。因此，希格斯衰变为两个光子是对希格斯扇区的一个有趣的探测。这项研究是使用模拟CLIC的检测器，并考虑到所有相关的物理和光束诱导过程中的一个完整的重建链。结果表明，假设5 ab $^{-1}$和非偏振光束的积分光度，可以测量$W^+W^-$聚变和BR中Higgs产生截面的乘积（$H\rightarrowγγ$），其相对统计不确定度为5.5%.
