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Observation of X (3872) production in pp collisions at √s =7 TeV
- Author(s): Aaij, R
- Beteta, CA
- Adeva, B
- Adinolfi, M
- Adrover, C
- Affolder, A
- Ajaltouni, Z
- Albrecht, J
- Alessio, F
- Alexander, M
- Alkhazov, G
- Cartelle, PA
- Alves, AA
- Amato, S
- Amhis, Y
- Anderson, J
- Appleby, RB
- Gutierrez, OA
- Archilli, F
- Arrabito, L
- Artamonov, A
- Artuso, M
- Aslanides, E
- Auriemma, G
- Bachmann, S
- Back, JJ
- Bailey, DS
- Balagura, V
- Baldini, W
- Barlow, RJ
- Barschel, C
- Barsuk, S
- Barter, W
- Bates, A
- Bauer, C
- Bauer, T
- Bay, A
- Bediaga, I
- Belogurov, S
- Belous, K
- Belyaev, I
- Ben-Haim, E
- Benayoun, M
- Bencivenni, G
- Benson, S
- Benton, J
- Bernet, R
- Bettler, MO
- Van Beuzekom, M
- Bien, A
- Bifani, S
- Bird, T
- Bizzeti, A
- Bjørnstad, PM
- Blake, T
- Blanc, F
- Blanks, C
- Blouw, J
- Blusk, S
- Bobrov, A
- Bocci, V
- Bondar, A
- Bondar, N
- Bonivento, W
- Borghi, S
- Borgia, A
- Bowcock, TJV
- Bozzi, C
- Brambach, T
- Van Den Brand, J
- Bressieux, J
- Brett, D
- Britsch, M
- Britton, T
- Brook, NH
- Brown, H
- Büchler-Germann, A
- Burducea, I
- Bursche, A
- Buytaert, J
- Cadeddu, S
- Callot, O
- Calvi, M
- Calvogomez, M
- Camboni, A
- Campana, P
- Carbone, A
- et al.
Published Web Location
https://doi.org/10.1140/epjc/s10052-012-1972-7Abstract
Using 34.7 pb−1of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at √s = 7 TeV is observed for the first time. Candidates are selected in the X(3872)→J/ψπ+π−decay mode, and used to measure σ(pp→X(3872)+anything)B(X(3872)→J/ψπ+π−) = 5.4 ± 1.3 (stat) ± 0.8 (syst) nb, where σ(pp →X(3872) + anything) is the inclusive production cross section of X(3872) mesons with rapidity in the range 2.5–4.5 and transverse momentum in the range 5–20 GeV/c. In addition the masses of both the X(3872) and ψ(2S) mesons, reconstructed in the J/ψπ+π−final state, are measured to be mX(3872) = 3871.95 ± 0.48 (stat) ± 0.12 (syst) MeV/c2and mψ(2S) = 3686.12± 0.06 (stat) ± 0.10 (syst) MeV/c2.