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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 835 more authors) , Alexander, M, Alfonso Albero, A, Alkhazov, G, Cartelle, P Alvarez, Alves Jr, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bieker, MS, 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(2019)
Measurement of the mass and production rate of Ξ<i><sub>b</sub></i><SUP>-</SUP><sub> </sub>baryons.
PHYSICAL REVIEW D, 99 (5).
052006-.
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Abstract
The first measurement of the production rate of $\Xi_b^-$ baryons in $pp$
collisions relative to that of $\Lambda_b^0$ baryons is reported, using data
samples collected by the LHCb experiment, and corresponding to integrated
luminosities of $1$, $2$ and $1.6$ fb$^{-1}$ at $\sqrt{s}=7,~8$ and $13$ TeV,
respectively. In the kinematic region $2 < \eta < 6$ and $p_{\rm T}<20$
GeV/$c$, we measure \begin{align*}
\frac{f_{\Xi_b^-}}{f_{\Lambda_b^0}}\frac{{\mathcal{B}}(\Xi_b^-\to
J/\psi\Xi^-)}{{\mathcal{B}}(\Lambda_b^0\to J/\psi\Lambda)} &=
(10.8\pm0.9\pm0.8)\times10^{-2}~~[\sqrt{s}=7,8~{\rm TeV}],\\
\frac{f_{\Xi_b^-}}{f_{\Lambda_b^0}}\frac{{\mathcal{B}}(\Xi_b^-\to
J/\psi\Xi^-)}{{\mathcal{B}}(\Lambda_b^0\to J/\psi\Lambda)} &=
(13.1\pm1.1\pm1.0)\times10^{-2}~~[\sqrt{s}=13~{\rm TeV}], \end{align*} where
$f_{\Xi_b^-}$ and $f_{\Lambda_b^0}$ are the fragmentation fractions of $b$
quarks into $\Xi_b^-$ and $\Lambda_b^0$ baryons, respectively, ${\mathcal{B}}$
represents branching fractions, and the uncertainties are due to statistical
and experimental systematic sources. The values of
$f_{\Xi_b^-}/f_{\Lambda_b^0}$ are obtained by invoking SU(3) symmetry in the
$\Xi_b^-\to J\psi\Xi^-$ and $\Lambda_b^0\to J/\psi\Lambda$ decays. Production
asymmetries between $\Xi_b^-$ and $\bar{\Xi}_b^+$ baryons are also reported.
The mass of the $\Xi_b^-$ baryon is also measured relative to that of the
$\Lambda_b^0$ baryon, from which it is found that \begin{align*} m(\Xi_b^-) &=
5796.70\pm0.39\pm0.15\pm0.17~{\rm MeV}/c^2, \end{align*} where the last
uncertainty is due to the precision on the known $\Lambda_b^0$ mass. This
result represents the most precise determination of the $\Xi_b^-$ mass.