期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 78, 期 11, 页码 1023-1028出版社
KOREAN PHYSICAL SOC
DOI: 10.1007/s40042-021-00148-5
关键词
CKM; Top quark; LHC
资金
- Korean National Research Foundation [NRF-2020R1A2B5B02001726, NRF-2008-00460]
Measurements of the Cabbibo-Kobayashi-Maskawa matrix elements are crucial for testing the standard model, with some discrepancies identified in current measurements of |V-cb|. A new method proposed for measuring |V-cb at the LHC shows promise in resolving these discrepancies, utilizing real W bosons from tt-bar events for analysis.
Measurements of the Cabbibo-Kobayashi-Maskawa matrix elements are important tests of the consistency of the standard model. However, there is some tension in the |V-cb| measurements, depending on the final states used. The |V-cb has been determined from the measured branching ratios of a B-hadron to final states with c quarks. An independent method of measuring |V-cb| is needed to understand the cause of the discrepancies. We propose a new way of measuring |V-cb at the LHC. It can be measured from decay of real W bosons W -> c (b) over bar, where the source of the real W bosons is the abundant t (t) over bar sample. By applying b-tagging algorithms on jets from W -> q (q) over bar, we can measure the fraction of W -> c (b) over bar present. With approximately 300 fb(-1) of data, the significance is large enough to merit further development of the method.
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