Bottom quark

The bottom quark or b quark, also known as the beauty quark, is a third-generation quark with a charge of −⁄₃ e. Although all quarks are described in a similar way by quantum chromodynamics, the bottom quark's large bare mass (around 7000420000000000000♠4.2 GeV/c, a bit more than four times the mass of a proton), combined with low values of the CKM matrix elements V_ub and V_cb, gives it a distinctive signature that makes it relatively easy to identify experimentally (using a technique called B-tagging). Because three generations of quark are required for CP violation (see CKM matrix), mesons containing the bottom quark are the easiest particles to use to investigate the phenomenon; such experiments are being performed at the BaBar, Belle and LHCb experiments.

单词	B Quark
释义	B Quark 英语百科 Bottom quark The bottom quark or b quark, also known as the beauty quark, is a third-generation quark with a charge of −⁄₃ e. Although all quarks are described in a similar way by quantum chromodynamics, the bottom quark's large bare mass (around 7000420000000000000♠4.2 GeV/c, a bit more than four times the mass of a proton), combined with low values of the CKM matrix elements V_ub and V_cb, gives it a distinctive signature that makes it relatively easy to identify experimentally (using a technique called B-tagging). Because three generations of quark are required for CP violation (see CKM matrix), mesons containing the bottom quark are the easiest particles to use to investigate the phenomenon; such experiments are being performed at the BaBar, Belle and LHCb experiments.
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B Quark

Bottom quark