Abstract
The latest results of the CKM angle $\gamma$ combination are presented for the 2020 LHCb Implications Workshop. New and updated inputs from $ B ^+ \rightarrow D h^+$ ( $ D\rightarrow h^+h^-$ ), $ B ^+ \rightarrow D h^+$ ( $ D\rightarrow K ^0_{\mathrm{S}} h^+h^-$ ), $ B ^+ \rightarrow D h^+$ ( $ D\rightarrow K ^0_{\mathrm{S}} K^\pm\pi^\mp$ ), $ B ^+ \rightarrow D^* h^{+} $ ( $ D\rightarrow h^+h^-$ ), $ B ^0 \rightarrow D K^{*0}$ ( $ D\rightarrow h^+h^-$ and $ D\rightarrow h^+\pi^-\pi^+\pi^-$ ) and $ B ^0_ s \rightarrow D_s^\mp K^\pm \pi^\pm \pi^\mp$ ( $ D ^{\pm}_ s \rightarrow h^{\pm} h^{\mp} \pi ^\pm $ ) decays are included, where $h = K$ or $\pi$. The new combination gives $\gamma = (67\pm4)^\circ$, where the uncertainty includes both statistical and systematic effects.
Figures and captions
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One dimensional $ 1-{\rm CL}$ scan showing the result of the $\gamma$ combination. The components corresponding to the various $B$-meson species are also reported. |
gammac[..].pdf [16 KiB] HiDef png [340 KiB] Thumbnail [209 KiB] *.C file |
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Profile-likelihood contours of the result of the combination for $\gamma$ vs. $r^{DK^\pm}_{ B ^\pm }$ (top) and $\delta^{DK^\pm}_{ B ^\pm }$ (bottom). The contours show the two-dimensional regions which contain $68.3\%$ and $95.4\%$ of the distributions. Partial combinations corresponding to the specific decay modes are also shown. |
gammac[..].pdf [26 KiB] HiDef png [441 KiB] Thumbnail [257 KiB] *.C file |
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gammac[..].pdf [21 KiB] HiDef png [438 KiB] Thumbnail [257 KiB] *.C file |
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Animated gif made out of all figures. |
CONF-2020-003.gif Thumbnail |
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![HiDef png [340 KiB]](Directory_LHCb-CONF-2020-003/hidef_gammacharm_lhcb_comp_flavour.png){kind=link}
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![HiDef png [438 KiB]](Directory_LHCb-CONF-2020-003/hidef_gammacharm_lhcb_dhch_g_d_dk.png){kind=link}
Tables and captions
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List of the LHCb measurements used in the $\gamma$ combination. Those that have changed since the previous combination [3] are highlighted in bold. Measurements denoted by (*) include only a fraction of the Run 2 sample, corresponding to data taken in 2015 and 2016. |
Table_1.pdf [83 KiB] HiDef png [142 KiB] Thumbnail [64 KiB] tex code |
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A summary of the obtained central values and uncertainties (at 1 and 2 $\sigma$) for the CKM angle $\gamma$ for the LHCb combination and modes split by the initial $B$ state. These values are extracted from the profile-likelihood scans in Fig. 1. |
Table_2.pdf [68 KiB] HiDef png [68 KiB] Thumbnail [31 KiB] tex code |
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![HiDef png [142 KiB]](Directory_LHCb-CONF-2020-003/hidef_Table_1.png){kind=link}
![HiDef png [68 KiB]](Directory_LHCb-CONF-2020-003/hidef_Table_2.png){kind=link}
Created on 02 May 2024.