{"id":3532,"date":"2026-05-27T18:13:54","date_gmt":"2026-05-27T09:13:54","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/?post_type=seminar&p=3532"},"modified":"2026-05-27T18:36:52","modified_gmt":"2026-05-27T09:36:52","slug":"tau-leptons-as-a-probe-of-new-physics-searches-full-bunch-crossing-analysis-and-future-colliders","status":"publish","type":"seminar","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/3532\/","title":{"rendered":"Tau Leptons as a Probe of New Physics: Searches, Full Bunch-Crossing Analysis, and Future Colliders"},"content":{"rendered":"

The three-generation structure of fermions and the striking hierarchy of their mass spectra \u2014 collectively known as the flavor puzzles \u2014 remain among the most profound open questions in particle physics. Tau leptons, as the heaviest known leptons, offer a unique window into these puzzles and potential new interactions preferentially coupled to third-generation fermions.
\nIn this talk, I will present an overview of my group’s research at the CMS experiment pursuing this direction. I will cover indirect new physics searches through a measurement of the Bs \u2192 tau tau branching ratio using tt\u0304 events, achieving a sensitivity competitive with B-factory experiment. I will also present an innovative L1 scouting approach enabled by the HL-LHC track-finder upgrade; by clustering these tracks to reconstruct tau and boosted di-tau candidates in real time at 40 MHz and storing only their limited kinematic information, this approach unlocks full bunch-crossing analyses for the first time.
\nFinally, if time allows, I will discuss our group’s activities toward FCCee, the next-generation flagship collider experiment just accepted by the CERN Council, covering physics case studies and future silicon detector development.<\/p>\n

\n

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\u672c\u30bb\u30df\u30ca\u30fc\u3067\u306f\u3001CMS\u5b9f\u9a13\u306b\u304a\u3044\u3066\u79c1\u305f\u3061\u306e\u30b0\u30eb\u30fc\u30d7\u304c\u9032\u3081\u3066\u3044\u308b\u7814\u7a76\u306e\u6982\u8981\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u307e\u305a\u3001tt\u0304\u30a4\u30d9\u30f3\u30c8\u3092\u7528\u3044\u305fBs<\/sub> -> τ τ\u5206\u5c90\u6bd4\u306e\u6e2c\u5b9a\u306b\u3088\u308b\u9593\u63a5\u7684\u306a\u65b0\u7269\u7406\u63a2\u7d22\u306b\u3064\u3044\u3066\u53d6\u308a\u4e0a\u3052\u3001\u305d\u306e\u611f\u5ea6\u304cB\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u5b9f\u9a13\u306b\u5339\u6575\u3059\u308b\u30ec\u30d9\u30eb\u306b\u9054\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u6b21\u306b\u3001HL-LHC\u5b9f\u9a13\u306b\u304a\u3051\u308b\u30c8\u30e9\u30c3\u30af\u30d5\u30a1\u30a4\u30f3\u30c0\u30fc\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u306b\u3088\u3063\u3066\u5b9f\u73fe\u3055\u308c\u308b\u9769\u65b0\u7684\u306aL1 scouting\u624b\u6cd5\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3053\u306e\u624b\u6cd5\u3067\u306f\u300140 MHz\u306e\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u30c8\u30e9\u30c3\u30af\u3092\u30af\u30e9\u30b9\u30bf\u30ea\u30f3\u30b0\u3057\u3001\u30bf\u30a6\u304a\u3088\u3073\u30d6\u30fc\u30b9\u30c8\u3055\u308c\u305fdi-tau\u5019\u88dc\u3092\u518d\u69cb\u6210\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u9650\u3089\u308c\u305f\u904b\u52d5\u5b66\u7684\u306a\u60c5\u5831\u306e\u307f\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u307e\u3067\u4e0d\u53ef\u80fd\u3067\u3042\u3063\u305f\u5168\u30d0\u30f3\u30c1\u4ea4\u5dee\u89e3\u6790\u3092\u306f\u3058\u3081\u3066\u5b9f\u73fe\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u6642\u9593\u304c\u8a31\u305b\u3070\u3001CERN\u8a55\u8b70\u4f1a\u306b\u3088\u308a\u63a1\u629e\u3055\u308c\u305f\u3070\u304b\u308a\u306e\u6b21\u4e16\u4ee3\u30d5\u30e9\u30c3\u30b0\u30b7\u30c3\u30d7\u52a0\u901f\u5668\u5b9f\u9a13\u3067\u3042\u308bFCC-ee\u306b\u5411\u3051\u305f\u79c1\u305f\u3061\u306e\u53d6\u308a\u7d44\u307f\u306b\u3064\u3044\u3066\u3001\u7269\u7406\u306e\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3\u3084\u5c06\u6765\u306e\u30b7\u30ea\u30b3\u30f3\u691c\u51fa\u5668\u958b\u767a\u3092\u542b\u3081\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"featured_media":0,"template":"","tags":[],"seminar_category":[154],"acf":{"s_now_accepting":true,"s_date_order":"2026-06-18 16:00:00","s_date_end":"2026-06-18 17:00:00","s_date_text":"16:00 - 17:00","s_text":"Yuta Takahashi (University of Florida)","s_place":"ES635 + Zoom","s_place_other":"","s_categoryother":"","s_poster":"","s_poster2":"","s_slide":""},"yoast_head":"\nTau Leptons as a Probe of New Physics: Searches, Full Bunch-Crossing Analysis, and Future Colliders - 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\/seminar\/3532\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tau Leptons as a Probe of New Physics: Searches, Full Bunch-Crossing Analysis, and Future Colliders - KMI - Nagoya University\" \/>\n<meta property=\"og:description\" content=\"The three-generation structure of fermions and the striking hierarchy of their mass spectra \u2014 collectively known as the flavor puzzles \u2014 remain among the most profound open questions in particle physics. 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