{"id":26435,"date":"2024-02-25T18:35:36","date_gmt":"2024-02-25T19:35:36","guid":{"rendered":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%b4%d9%88%d8%a7%d9%87%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-evidence-for-b%e2%86%92k%ce%bd%ce%bd%c2%af-decays-%d9%be%d9%88%d8%b3%db%8c%d8%af%da%af%db%8c\/"},"modified":"2024-02-25T18:35:37","modified_gmt":"2024-02-25T19:35:37","slug":"%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%b4%d9%88%d8%a7%d9%87%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-evidence-for-b%e2%86%92k%ce%bd%ce%bd%c2%af-decays-%d9%be%d9%88%d8%b3%db%8c%d8%af%da%af%db%8c","status":"publish","type":"product","link":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%b4%d9%88%d8%a7%d9%87%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-evidence-for-b%e2%86%92k%ce%bd%ce%bd%c2%af-decays-%d9%be%d9%88%d8%b3%db%8c%d8%af%da%af%db%8c\/","title":{"rendered":"\u0645\u0642\u0627\u0644\u0647 \u0634\u0648\u0627\u0647\u062f\u06cc \u0628\u0631\u0627\u06cc Evidence for B+\u2192K+\u03bd\u03bd\u00af Decays \u067e\u0648\u0633\u06cc\u062f\u06af\u06cc"},"content":{"rendered":"<table class=\"table table-striped table-hover\">\n<tbody>\n<tr>\n<td>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc <\/td>\n<td>Evidence for $B^{+}\\to K^{+}\u03bd\\bar\u03bd$ Decays<\/td>\n<\/tr>\n<tr>\n<td>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc <\/td>\n<td>\u0645\u0642\u0627\u0644\u0647 \u0634\u0648\u0627\u0647\u062f\u06cc \u0628\u0631\u0627\u06cc $ b^{+}  to k^{+} \u03bd  bar\u03bd $ \u067e\u0648\u0633\u06cc\u062f\u06af\u06cc<\/td>\n<\/tr>\n<tr>\n<td>\u0646\u0648\u06cc\u0633\u0646\u062f\u06af\u0627\u0646 <\/td>\n<td> Belle II Collaboration, I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, M. Barrett, J. Baudot, M. Bauer, A. Baur, A. Beaubien<\/td>\n<\/tr>\n<tr>\n<td>\u0632\u0628\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 <\/td>\n<td>\u0627\u0646\u06af\u0644\u06cc\u0633\u06cc<\/td>\n<\/tr>\n<tr>\n<td>\u0641\u0631\u0645\u062a \u0645\u0642\u0627\u0644\u0647: <\/td>\n<td>PDF<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0639\u062f\u0627\u062f \u0635\u0641\u062d\u0627\u062a<\/td>\n<td>29<\/td>\n<\/tr>\n<tr>\n<td>\u062f\u0633\u062a\u0647 \u0628\u0646\u062f\u06cc \u0645\u0648\u0636\u0648\u0639\u0627\u062a  <\/td>\n<td>High Energy Physics &#8211; Experiment,\u0641\u06cc\u0632\u06cc\u06a9 \u0627\u0646\u0631\u0698\u06cc \u0628\u0627\u0644\u0627 &#8211; \u0622\u0632\u0645\u0627\u06cc\u0634 ,<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0648\u0636\u06cc\u062d\u0627\u062a    <\/td>\n<td>Submitted 24 November, 2023; originally announced November 2023. , Comments: 29 pages, 23 figures, to be submitted to PRD , Report number: Belle II Preprint 2023-017, KEK Preprint 2023-35<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0648\u0636\u06cc\u062d\u0627\u062a \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc    <\/td>\n<td>\u0627\u0631\u0633\u0627\u0644 \u0634\u062f\u0647 24 \u0646\u0648\u0627\u0645\u0628\u0631 2023 \u061b\u062f\u0631 \u0627\u0628\u062a\u062f\u0627 \u0646\u0648\u0627\u0645\u0628\u0631 2023 \u0627\u0639\u0644\u0627\u0645 \u0634\u062f \u060c \u0646\u0638\u0631\u0627\u062a: 29 \u0635\u0641\u062d\u0647 \u060c 23 \u0634\u06a9\u0644 \u060c \u06a9\u0647 \u0628\u0647 PRD \u0627\u0631\u0633\u0627\u0644 \u0645\u06cc \u0634\u0648\u062f \u060c \u0634\u0645\u0627\u0631\u0647 \u06af\u0632\u0627\u0631\u0634: Belle II Preprint 2023-017 \u060c Kek Preprint 2023-35<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0686\u06a9\u06cc\u062f\u0647<\/h2>\n<p style=\"direction:ltr;\">We search for the rare decay $B^{+}\\rightarrow K^{+}\u03bd\\bar\u03bd$ in a $362\\ \\rm{fb}^{-1}$ sample of electron-positron collisions at the $\u03a5(4S)$ resonance collected with the Belle II detector at the SuperKEKB collider. We use the inclusive properties of the accompanying $B$ meson in $\u03a5(4S) \\to B\\kern 0.18em\\overline{\\kern -0.18em B}{}$ events to suppress background from other decays of the signal $B$ candidate and light-quark pair production. We validate the measurement with an auxiliary analysis based on a conventional hadronic reconstruction of the accompanying $B$ meson. For background suppression, we exploit distinct signal features using machine learning methods tuned with simulated data. The signal-reconstruction efficiency and background suppression are validated through various control channels. The branching fraction is extracted in a maximum likelihood fit. Our inclusive and hadronic analyses yield consistent results for the $B^{+}\\rightarrow K^{+}\u03bd\\bar\u03bd$ branching fraction of $\\left[2.7\\pm 0.5(\\mathrm{stat})\\pm 0.5(\\mathrm{syst})\\right] \\times 10^{-5}$ and $\\left[1.1^{+0.9}_{-0.8}(\\mathrm{stat}){}^{+0.8}_{-0.5}(\\mathrm{syst})\\right] \\times 10^{-5}$, respectively. Combining the results, we determine the branching fraction of the decay $B^{+}\\rightarrow K^{+}\u03bd\\bar\u03bd$ to be $\\left[2.3 \\pm 0.5(\\mathrm{stat})^{+0.5}_{-0.4}(\\mathrm{syst})\\right]\\times 10^{-5}$, providing the first evidence for this decay at $3.5$ standard deviations. The combined result is $2.7$ standard deviations above the standard model expectation.<\/p>\n<h2>\u0686\u06a9\u06cc\u062f\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc (\u062a\u0631\u062c\u0645\u0647 \u0645\u0627\u0634\u06cc\u0646\u06cc)<\/h2>\n<p>\u0645\u0627 \u062f\u0631 \u062c\u0633\u062a\u062c\u0648\u06cc \u062e\u0631\u0627\u0628\u06cc \u0646\u0627\u062f\u0631 $ b^{+}  RightArrow K^{+} \u03bd  bar\u03bd $ \u062f\u0631 362   rm {fb}^{-1} $ \u0646\u0645\u0648\u0646\u0647 \u0627\u0632 \u0628\u0631\u062e\u0648\u0631\u062f \u0627\u0644\u06a9\u062a\u0631\u0648\u0646\u06cc-\u067e\u0648\u0633\u06cc\u062a\u0631\u0648\u0646 \u062f\u0631 $ \u03c5 (4s) \u0631\u0632\u0648\u0646\u0627\u0646\u0633 $ \u062c\u0645\u0639 \u0622\u0648\u0631\u06cc \u0634\u062f\u0647 \u0628\u0627 \u0631\u062f\u06cc\u0627\u0628 Belle II \u062f\u0631 Collider SuperKekb.\u0645\u0627 \u0627\u0632 \u062e\u0648\u0627\u0635 \u0641\u0631\u0627\u06af\u06cc\u0631 \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 $ b $ meson \u062f\u0631 $ \u03c5 (4s)  to b  kern 0.18em  overline { kern -0.18em b} {} $ \u0628\u0631\u0627\u06cc \u0633\u0631\u06a9\u0648\u0628 \u067e\u06cc\u0634 \u0632\u0645\u06cc\u0646\u0647 \u0627\u0632 \u0633\u0627\u06cc\u0631 \u062f\u06cc\u0641\u0631\u0627\u0646\u0633 \u0647\u0627\u06cc \u0633\u06cc\u06af\u0646\u0627\u0644 $ b \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645.$ \u0646\u0627\u0645\u0632\u062f \u0648 \u062a\u0648\u0644\u06cc\u062f \u062c\u0641\u062a \u0633\u0628\u06a9.\u0645\u0627 \u0627\u0646\u062f\u0627\u0632\u0647 \u06af\u06cc\u0631\u06cc \u0631\u0627 \u0628\u0627 \u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u06a9\u0645\u06a9\u06cc \u0628\u0631 \u0627\u0633\u0627\u0633 \u0628\u0627\u0632\u0633\u0627\u0632\u06cc \u0647\u0627\u062f\u0631\u0648\u0646\u06cc\u06a9 \u0645\u0639\u0645\u0648\u0644\u06cc \u0627\u0632 \u0645\u0632\u0648\u0646 \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 $ B $ \u062a\u0623\u06cc\u06cc\u062f \u0645\u06cc \u06a9\u0646\u06cc\u0645.\u0628\u0631\u0627\u06cc \u0633\u0631\u06a9\u0648\u0628 \u067e\u0633 \u0632\u0645\u06cc\u0646\u0647 \u060c \u0645\u0627 \u0627\u0632 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0633\u06cc\u06af\u0646\u0627\u0644 \u0645\u062c\u0632\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0631\u0648\u0634\u0647\u0627\u06cc \u06cc\u0627\u062f\u06af\u06cc\u0631\u06cc \u0645\u0627\u0634\u06cc\u0646 \u062a\u0646\u0638\u06cc\u0645 \u0634\u062f\u0647 \u0628\u0627 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0634\u0628\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0634\u062f\u0647 \u0628\u0647\u0631\u0647 \u0628\u0631\u062f\u0627\u0631\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u0645.\u0631\u0627\u0646\u062f\u0645\u0627\u0646 \u0628\u0627\u0632\u0633\u0627\u0632\u06cc \u0633\u06cc\u06af\u0646\u0627\u0644 \u0648 \u0633\u0631\u06a9\u0648\u0628 \u067e\u0633 \u0632\u0645\u06cc\u0646\u0647 \u0627\u0632 \u0637\u0631\u06cc\u0642 \u06a9\u0627\u0646\u0627\u0644 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u06a9\u0646\u062a\u0631\u0644 \u062a\u0623\u06cc\u06cc\u062f \u0645\u06cc \u0634\u0648\u062f.\u0628\u062e\u0634 \u0627\u0646\u0634\u0639\u0627\u0628 \u062f\u0631 \u062d\u062f\u0627\u06a9\u062b\u0631 \u0627\u062d\u062a\u0645\u0627\u0644 \u0627\u0633\u062a\u062e\u0631\u0627\u062c \u0645\u06cc \u0634\u0648\u062f.\u062a\u062c\u0632\u06cc\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644 \u0647\u0627\u06cc \u0641\u0631\u0627\u06af\u06cc\u0631 \u0648 \u0647\u0627\u062f\u0631\u0648\u0646\u06cc\u06a9 \u0645\u0627 \u0646\u062a\u0627\u06cc\u062c \u0645\u062f\u0627\u0648\u0645 \u0628\u0631\u0627\u06cc $ b^{+}  RightArrow K^{+} \u03bd  bar\u03bd $ \u0627\u0646\u0634\u0639\u0627\u0628 $  \u0633\u0645\u062a \u0686\u067e [2.7  PM 0.5 ( Mathrm {stat})  PM 0.5 ( PM 0.5 (Mathrm {syst})  Right]  Times 10^{-5} $ and $  \u0633\u0645\u062a \u0686\u067e [1.1^{+0.9} _ {-0.8} ( mathrm {stat}) {}^{+0.8} _ {-0.5} ( mathrm {syst})  RIGHT]  TIME 10^{-5} $.\u0628\u0627 \u062a\u0631\u06a9\u06cc\u0628 \u0646\u062a\u0627\u06cc\u062c \u060c \u0645\u0627 \u0628\u062e\u0634 \u0634\u0627\u062e\u0647 \u0627\u06cc \u0627\u0632 \u067e\u0648\u0633\u06cc\u062f\u06af\u06cc $ b^{+}  reldarrow k^{+} \u03bd  bar\u03bd $ \u0631\u0627 \u062a\u0639\u06cc\u06cc\u0646 \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u062a\u0627 $  \u0633\u0645\u062a \u0686\u067e [2.3  pm 0.5 ( mathrm {stat})^{+0.5} _ {-0.4} ( mathrm {syst})  \u062f\u0631\u0633\u062a]  \u0628\u0627\u0631\u0647\u0627 10^{-5} $ \u060c \u0627\u0631\u0627\u0626\u0647 \u0627\u0648\u0644\u06cc\u0646 \u0634\u0648\u0627\u0647\u062f \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u067e\u0648\u0633\u06cc\u062f\u06af\u06cc \u0628\u0627 \u0627\u0646\u062d\u0631\u0627\u0641 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f 3.5 $.\u0646\u062a\u06cc\u062c\u0647 \u062a\u0631\u06a9\u06cc\u0628\u06cc 2.7 \u062f\u0644\u0627\u0631 \u0627\u0646\u062d\u0631\u0627\u0641 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0628\u0627\u0644\u0627\u062a\u0631 \u0627\u0632 \u0627\u0646\u062a\u0638\u0627\u0631 \u0645\u062f\u0644 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0627\u0633\u062a.<\/p>\n<table class=\"table table-bordered table-primary\">\r\n<tr>\r\n\t<td>\r\n\t\u062a\u0648\u062c\u0647 \u06a9\u0646\u06cc\u062f \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u0627\u0633\u062a.\r\n\t<\/td>\r\n<\/tr>\r\n\t\r\n<tr>\r\n\t<td>\r\n     \u0628\u0631\u0627\u06cc \u0633\u0641\u0627\u0631\u0634 \u062a\u0631\u062c\u0645\u0647 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0647 \u06cc\u06a9\u06cc \u0627\u0632 \u0631\u0648\u0634 \u0647\u0627\u06cc \u062a\u0645\u0627\u0633\u060c \u067e\u06cc\u0627\u0645\u06a9\u060c \u062a\u0644\u06af\u0631\u0627\u0645 \u0648 \u06cc\u0627 \u0648\u0627\u062a\u0633 \u0627\u067e \u0628\u0627 \u0634\u0645\u0627\u0631\u0647 \u0632\u06cc\u0631 \u062a\u0645\u0627\u0633 \u0628\u06af\u06cc\u0631\u06cc\u062f:\r\n\t<br \/><br \/>\r\n\t09395106248\r\n\t\t\r\n\t\t\r\n\t<br \/><br \/>\r\n\t\t\u062a\u0648\u062c\u0647 \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0634\u0631\u0627\u06cc\u0637 \u062a\u0631\u062c\u0645\u0647 \u0628\u0647 \u0635\u0648\u0631\u062a \u0632\u06cc\u0631 \u0627\u0633\u062a:\r\n\t\t<br \/>\r\n\t\t<ul>\r\n\t\t<li>\r\n\t\t\u0642\u06cc\u0645\u062a \u0647\u0631 \u0635\u0641\u062d\u0647 \u062a\u0631\u062c\u0645\u0647 \u062f\u0631 \u062d\u0627\u0644 \u062d\u0627\u0636\u0631 40 \u0647\u0632\u0627\u0631 \u062a\u0648\u0645\u0627\u0646 \u0645\u06cc \u0628\u0627\u0634\u062f. \r\n\t\t<\/li>\r\n\t\t<li>\r\n\t\t\u062a\u062d\u0648\u06cc\u0644 \u0645\u0642\u0627\u0644\u0647 \u062a\u0631\u062c\u0645\u0647 \u0634\u062f\u0647 \u0628\u0647 \u0635\u0648\u0631\u062a \u0641\u0627\u06cc\u0644 \u0648\u0631\u062f \u0645\u06cc \u0628\u0627\u0634\u062f.\r\n\t\t<\/li>\r\n\t\t<li>\r\n\t\t\u0632\u0645\u0627\u0646 \u062a\u062d\u0648\u06cc\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u0642\u0627\u0644\u0647 \u062f\u0631 \u0635\u0648\u0631\u062a \u062f\u0627\u0634\u062a\u0646 \u062a\u0639\u062f\u0627\u062f \u0635\u0641\u062d\u0627\u062a \u0639\u0627\u062f\u06cc \u0628\u06cc\u0646 3 \u062a\u0627 5 \u0631\u0648\u0632 \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f.\r\n\t\t<\/li>\r\n\t\t\r\n\t\t<li>\r\n\t\t\u06a9\u06cc\u0641\u06cc\u062a \u062a\u0631\u062c\u0645\u0647 \u0628\u0633\u06cc\u0627\u0631 \u0628\u0627\u0644\u0627 \u0645\u06cc \u0628\u0627\u0634\u062f. \u0645\u0642\u0627\u0644\u0647 \u0641\u0642\u0637 \u062a\u0648\u0633\u0637 \u0645\u062a\u0631\u062c\u0645\u06cc\u0646 \u0628\u0627 \u0645\u062f\u0631\u06a9 \u062f\u0627\u0646\u0634\u06af\u0627\u0647\u06cc \u0645\u062a\u0631\u062c\u0645\u06cc \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f.\r\n\t\t<\/li>\r\n\t\t<li>\r\n\t\t\u06a9\u0644\u06cc\u0647 \u062c\u062f\u0627\u0648\u0644 \u0648 \u0641\u0631\u0645\u0648\u0644 \u0647\u0627 \u0646\u06cc\u0632 \u062f\u0631 \u0641\u0627\u06cc\u0644 \u062a\u062d\u0648\u06cc\u0644\u06cc \u0648\u0631\u062f \u062f\u0631\u062c \u0645\u06cc\u200c\u0634\u0648\u0646\u062f.\r\n\t\t<\/li>\r\n\t<\/td>\r\n\t\r\n\t\r\n<\/tr>\r\n<\/table>\r\n\r\n\r\n\n","protected":false},"excerpt":{"rendered":"<p>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc Evidence for $B^{+}\\to K^{+}\u03bd\\bar\u03bd$ Decays \u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc \u0645\u0642\u0627\u0644\u0647 \u0634\u0648\u0627\u0647\u062f\u06cc \u0628\u0631\u0627\u06cc $ b^{+} to k^{+} 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