Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 7: Flavour physics V

T 7.4: Vortrag

Montag, 15. März 2021, 16:45–17:00, Tg

Probing the R(D^(*)) discrepancy with the B→ X τ ν channel at Belle II — Florian Bernlochner, Jochen Dingfelder, •Henrik Junkerkalefeld, and Peter Lewis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

In the absence of direct evidence for new physical phenomena at the TeV scale, several measurements in the flavor sector are spotlighted that might be in tension with theoretical predictions. Of these flavor anomalies, excesses in the R(D) and R(D^*) ratios measured by multiple experiments have caused particularly large interest in recent years.

The new Belle II experiment in Japan enables a complementary test of these measurements. Due to the controlled production of BB pairs, the inclusive measurement of B → X τ ν becomes possible. Its measurement should contribute important information to the R(D^(*)) problem. Additionally, this channel should help constrain the currently unmeasured contribution of B→ D^** τ ν decays.

In this talk, the general analysis strategy of the B → X τ ν branching fraction measurement is presented and first attempts to separate the signal from background are outlined.