Precision measurement of the $$ {B}_c^{+} $$ meson mass

• Published in: The journal of high energy physics Vol. 2020; no. 7
• Main Authors: Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C. A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Archilli, F., Artamonov, A., Artuso, M., Arzymatov, K., Aslanides, E., Atzeni, M., Audurier, B., Bachmann, S., Back, J. J., Baker, S., Balagura, V., Baldini, W., Baptista Leite, J., Barlow, R. J., Barsuk, S., Barter, W., Bartolini, M., Baryshnikov, F., Basels, J. M., Bassi, G., Batozskaya, V., Batsukh, B., Battig, A., Bay, A., Becker, M., Bedeschi, F., Bediaga, I., Beiter, A., Belavin, V., Belin, S., Bellee, V., Belous, K., Belyaev, I., Bencivenni, G., Ben-Haim, E., Benson, S., Berezhnoy, A., Bernet, R., Berninghoff, D., Bernstein, H. C., Bertella, C., Bertholet, E., Bertolin, A., Betancourt, C., Betti, F., Bettler, M. O., Bezshyiko, Ia, Bhasin, S., Bhom, J., Bieker, M. S., Bifani, S., Billoir, P., Bizzeti, A., Bjørn, M., Blago, M. P., Blake, T., Blanc, F., Blusk, S., Bobulska, D., Bocci, V., Boente Garcia, O., Boettcher, T., Boldyrev, A., Bondar, A., Bondar, N., Borghi, S., Borisyak, M., Borsato, M., Borsuk, J. T., Bowcock, T. J. V., Boyer, A., Bozzi, C., Bradley, M. J., Braun, S., Brea Rodriguez, A., Brodski, M., Brodzicka, J.
• Format: Journal Article
• Language: English
• Published: 01.07.2020
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP07(2020)123

A bstract A precision measurement of the $$ {B}_c^{+} $$ B c + meson mass is performed using proton- proton collision data collected with the LHCb experiment at centre-of-mass energies of 7 , 8 and 13 TeV, corresponding to a total integrated luminosity of 9 . 0 fb − 1 . The $$ {B}_c^{+} $$ B c + mesons are reconstructed via the decays $$ {B}_c^{+} $$ B c + → J/ψπ + , $$ {B}_c^{+} $$ B c + → J/ψπ + π − π + , $$ {B}_c^{+}\to J/\psi p\overline{p}{\pi}^{+} $$ B c + → J / ψp p ¯ π + , $$ {B}_c^{+}\to J/\psi {D}_s^{+} $$ B c + → J / ψ D s + , $$ {B}_c^{+} $$ B c + → J/ψ D 0 K + and $$ {B}_c^{+}\to {B}_s^0{\pi}^{+} $$ B c + → B s 0 π + . Combining the results of the individual decay channels, the $$ {B}_c^{+} $$ B c + mass is measured to be 6274 . 47 ± 0 . 27 (stat) ± 0 . 17 (syst) MeV /c 2 . This is the most precise measurement of the $$ {B}_c^{+} $$ B c + mass to date. The difference between the $$ {B}_c^{+} $$ B c + and $$ {B}_s^0 $$ B s 0 meson masses is measured to be 907 . 75 ± 0 . 37 (stat) ± 0 . 27 (syst) MeV /c .