{"id":1643,"date":"2020-02-25T12:11:12","date_gmt":"2020-02-25T03:11:12","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?p=1643"},"modified":"2020-12-09T13:35:55","modified_gmt":"2020-12-09T04:35:55","slug":"research-teppei-kitaharas-paper-was-highlighted-as-one-of-the-editors-suggestions-of-physics-review-letters","status":"publish","type":"post","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2020\/02\/25\/1643\/","title":{"rendered":"[Research] Teppei Kitahara\u2019s paper was highlighted as one of the Editors\u2019 Suggestions of Physical Review Letters"},"content":{"rendered":"<h6 style=\"text-align: center;\">Novel mechanism to avoid theoretical bound on kaon rare decays<\/h6>\n<figure id=\"attachment_1645\" aria-describedby=\"caption-attachment-1645\" style=\"width: 318px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa-300x300.png\" alt=\"\" width=\"318\" height=\"318\" class=\" wp-image-1645\" srcset=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa-300x300.png 300w, https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa-150x150.png 150w, https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa-768x768.png 768w, https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa.png 770w\" sizes=\"(max-width: 318px) 100vw, 318px\" \/><figcaption id=\"caption-attachment-1645\" class=\"wp-caption-text\">Example of proposed novel mechanism and the new particle <em>X<\/em><\/figcaption><\/figure>\n<p>Researchers try to revisit a theoretical bound, which is based on symmetries, between the charged and neutral kaon rare decays into the pion and neutrinos. Last September, KOTO experiment searching for neutral kaon rare decay reported events with an unexpected rate, which is much bigger than the standard model predictions. So far, KOTO experiment has not claimed that these events are the rare kaon decay signals. On the other hand, a theoretical upper bound on this rate comes from charged kaon data, and is incompatible with the events if the events are assumed to be the signals. A research collaboration, including Designated Assistant Professor Teppei Kitahara at KMI and Institute for Advanced Research, Nagoya University, has proposed novel mechanisms to avoid the upper bound by introducing a new light long-lived particle. If the KOTO events are confirmed as the signals, the proposed new particle is strongly anticipated. This research was published in Physical Review Letters on February 19, 2020, and selected as Editors&#8217; Suggestion, Featured in Physics (Synopsis), and the cover of Volume 124, Issue 7.<\/p>\n<p>&nbsp;<\/p>\n<h6>Link<\/h6>\n<p>Featured in Physics (Synopsis)<\/p>\n<p><a href=\"https:\/\/physics.aps.org\/synopsis-for\/10.1103\/PhysRevLett.124.071801\">https:\/\/physics.aps.org\/synopsis-for\/10.1103\/PhysRevLett.124.071801<\/a><\/p>\n<p>&nbsp;<\/p>\n<h6>Paper Information<\/h6>\n<p><em>Physical Review Letters <\/em>(February 19, Vol 124, (2020), 071801), \u201cNew Physics Implications of Recent Search for \u00a0at KOTO\u201d<\/p>\n<p>DOI: <a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.124.071801\">https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.124.071801<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Novel mechanism to avoid theoretical bound on kaon rare decays Researchers try to revisit a theoretical bound, which is based on symmetries, between the charged and neutral kaon rare decays into the pion and neutrinos. Last September, KOTO experiment searching for neutral kaon rare decay reported events with an unexpected rate, which is much bigger than the standard model predictions. So far, KOTO experiment has not claimed that these events are the rare kaon decay signals. On the other hand, &hellip; <\/p>\n","protected":false},"author":4,"featured_media":1645,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[105,106],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Research] Teppei Kitahara\u2019s paper was highlighted as one of the Editors\u2019 Suggestions of Physical Review Letters - KMI - Nagoya University<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2020\/02\/25\/1643\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Research] Teppei Kitahara\u2019s paper was highlighted as one of the Editors\u2019 Suggestions of Physical Review Letters - KMI - Nagoya University\" \/>\n<meta property=\"og:description\" content=\"Novel mechanism to avoid theoretical bound on kaon rare decays Researchers try to revisit a theoretical bound, which is based on symmetries, between the charged and neutral kaon rare decays into the pion and neutrinos. Last September, KOTO experiment searching for neutral kaon rare decay reported events with an unexpected rate, which is much bigger than the standard model predictions. So far, KOTO experiment has not claimed that these events are the rare kaon decay signals. On the other hand, &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2020\/02\/25\/1643\/\" \/>\n<meta property=\"og:site_name\" content=\"KMI - Nagoya University\" \/>\n<meta property=\"article:published_time\" content=\"2020-02-25T03:11:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-12-09T04:35:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/wp-content\/uploads\/sites\/2\/2020\/02\/795316b92fc766b0181f6fef074f03fa.png\" \/>\n\t<meta property=\"og:image:width\" content=\"770\" \/>\n\t<meta property=\"og:image:height\" content=\"770\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"minamizaki\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"minamizaki\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2020\/02\/25\/1643\/\",\"url\":\"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/blog\/2020\/02\/25\/1643\/\",\"name\":\"[Research] Teppei Kitahara\u2019s paper was highlighted as one of the Editors\u2019 Suggestions of Physical Review Letters - 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