# 物理セミナー/Physics seminar

• 分類 物理セミナー
• 開始 2017/10/24（火）16:00
• 終了 2017/10/24（火）17:00
• 会場 Room 345, Building #4, Tsukuba-campus (MCU 296)
• 講演タイトル Lepton Flavour Universality tests using semitauonic decays at LHCb
• 講演者 Guy Wormser (University of Paris-Saclay)
• 言語 英語/English
• 連絡先 hideki.miyake@kek.jp (4896)
• ウェブサイトhttps://www2.kek.jp/physics-seminar/
• 食堂・売店 利用予定なし／0

### 概要

Tests of Lepton Flavour Universality are a sensitive probe for physics beyond the Standard Model (SM). Experimental tests of this feature in semitauonic b-hadron decays, such as BDτν, are sensitive to new particles that preferentially couple to the third generation of leptons. The world average for the ratio BR(B0->D(*)taunu)/B0->D*munu)

deviates from the very precise prediction of the SM by about 4 sigma, making this one of the most intriguing hints of potential new physics effects in the flavour sector.
The latest results on the measurement of semitauonic decays at LHCb using hadronic 3 prong tau decays will be presented,
along with future prospects. Thanks to this new method, LHCb becomes quite unexpectedly a major player in this area.