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${{\mathit B}_{{c}}{(2S)}^{\pm}}$ MASS

INSPIRE   PDGID:

M217M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 6871.2 \pm1.0}$ OUR AVERAGE $6871.7 \pm1.3 \pm0.3$ 24 1, 2 AAIJ 2019 Y LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8, 13 TeV $6870.6 \pm1.4 \pm0.3$ 51 3, 4 SIRUNYAN 2019 M CMS ${{\mathit p}}{{\mathit p}}$ at 13 TeV • • We do not use the following data for averages, fits, limits, etc. • • not seen 5 AAIJ 2018 AL LHCB ${{\mathit p}}{{\mathit p}}$ at 8 TeV $6842$ $\pm4$ $\pm5$ 57 6, 7 AAD 2014 AQ ATLS ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV 1  AAIJ 2019Y observed ${{\mathit B}_{{c}}{(2S)}^{+}}$ in the decay mode ${{\mathit B}_{{c}}{(2S)}^{+}}$ $\rightarrow$ ${{\mathit B}_{{c}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ( ${{\mathit B}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}$ ) with 2.2 (3.2) global (local) standard deviations significance. 2  AAIJ 2019Y reports mass difference measurement of M(${{\mathit B}_{{c}}{(2S)}^{+}}$) $−$ M(${{\mathit B}_{{c}}^{+}}$) = $597.2$ $\pm1.3$ $\pm0.1$ MeV. We have adjusted this measurement with our best value of M(${{\mathit B}_{{c}}^{+}}$) = $6274.47$ $\pm0.32$ (MeV). The first uncertainty of the M(${{\mathit B}_{{c}}{(2S)}^{+}}$) value is a total of uncertainties reported by the experiment and the second one comes from our best value of M(${{\mathit B}_{{c}}^{+}}$). 3  SIRUNYAN 2019M observed ${{\mathit B}_{{c}}{(2S)}^{+}}$ in the decay mode ${{\mathit B}_{{c}}{(2S)}^{+}}$ $\rightarrow$ ${{\mathit B}_{{c}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ( ${{\mathit B}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}$ ) with 6.5 standard deviations significance. 4  SIRUNYAN 2019M reports mass difference measurement of M(${{\mathit B}_{{c}}{(2S)}^{+}}$) $−$ M(${{\mathit B}_{{c}}^{+}}$) = $596.1$ $\pm1.2$ $\pm0.8$ MeV. We have adjusted this measurement with our best value of M(${{\mathit B}_{{c}}^{+}}$) = $6274.47$ $\pm0.32$ (MeV). The first uncertainty of the M(${{\mathit B}_{{c}}{(2S)}^{+}}$) value is a total of uncertainties reported by the experiment and the second one comes from our best value of M(${{\mathit B}_{{c}}^{+}}$). 5  AAIJ 2018AL reports an upper limit on the ratio of production cross sections for [${\mathit \sigma (}{{\mathit B}_{{c}}{(2S)}^{+}}{)}/{\mathit \sigma (}{{\mathit B}_{{c}}^{+}}{)}]\cdot{}$B( ${{\mathit B}_{{c}}{(2S)}^{+}}$ $\rightarrow$ ${{\mathit B}_{{c}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ) $<$ $0.04 - 0.09$ at 95$\%$ CL for the mass value reported by AAD 2014AQ. 6  Observed in the decay mode ${{\mathit B}_{{c}}{(2S)}^{+}}$ $\rightarrow$ ${{\mathit B}_{{c}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ( ${{\mathit B}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}$ ) with 5.2 standard deviations significance. 7  Might be the ${{\mathit B}_{{c}}^{*}{(2S)}}$.

References:

AAIJ 2019Y PRL 122 232001 Observation of an excited $B_c^+$ state SIRUNYAN 2019M PRL 122 132001 Observation of Two Excited B$^+_\mathrm{c}$ States and Measurement of the B$^+_\mathrm{c}$(2S) Mass in pp Collisions at $\sqrt{s} =$ 13 TeV AAIJ 2018AL JHEP 1801 138 Search for excited $B_{c}^{+}$ states AAD 2014AQ PRL 113 212004 Observation of an Excited ${{\mathit B}_{{c}}^{\pm}}$ Meson State with the ATLAS Detector