A measurement of the CP asymmetry difference between Λc+ → pK − K + and pπ−π+ decays
- Author(s): Aaij, R
- Adeva, B
- Adinolfi, M
- Ajaltouni, Z
- Akar, S
- Albrecht, J
- Alessio, F
- Alexander, M
- Alfonso Albero, A
- Ali, S
- Alkhazov, G
- Alvarez Cartelle, P
- Alves, AA
- Amato, S
- Amerio, S
- Amhis, Y
- An, L
- Anderlini, L
- Andreassi, G
- Andreotti, M
- Andrews, JE
- Appleby, RB
- Archilli, F
- d’Argent, P
- Arnau Romeu, J
- Artamonov, A
- Artuso, M
- Aslanides, E
- Atzeni, M
- Auriemma, G
- Baalouch, M
- Babuschkin, I
- Bachmann, S
- Back, JJ
- Badalov, A
- Baesso, C
- Baker, S
- Balagura, V
- Baldini, W
- Baranov, A
- Barlow, RJ
- Barschel, C
- Barsuk, S
- Barter, W
- Baryshnikov, F
- Batozskaya, V
- Battista, V
- Bay, A
- Beaucourt, L
- Beddow, J
- Bedeschi, F
- Bediaga, I
- Beiter, A
- Bel, LJ
- 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, I
- Bifani, S
- Billoir, P
- Birnkraut, A
- Bizzeti, A
- Bjørn, M
- Blake, T
- Blanc, F
- Blusk, S
- Bocci, V
- Boettcher, T
- Bondar, A
- Bondar, N
- Bordyuzhin, I
- Borghi, S
- Borisyak, M
- Borsato, M
- Bossu, F
- Boubdir, M
- Bowcock, TJV
- et al.
Published Web Location
https://link.springer.com/article/10.1007/JHEP03(2018)182Abstract
© 2018, The Author(s). The difference between the CP asymmetries in the decays Λc+ → pK−K+ and Λc+ → pπ−π+ is presented. Proton-proton collision data taken at centre-of-mass energies of 7 and 8 TeV collected by the LHCb detector in 2011 and 2012 are used, corresponding to an integrated luminosity of 3 fb−1. The Λc+ candidates are reconstructed as part of the Λb0 → Λc+μ−X decay chain. In order to maximize the cancellation of production and detection asymmetries in the difference, the final-state kinematic distributions of the two samples are aligned by applying phase-space-dependent weights to the Λc+ → pπ−π+ sample. This alters the definition of the integrated CP asymmetry to ACPwgt(pπ−π+). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λc+ decay phase space. The difference in CP asymmetries is found to be ΔACPwgt=ACP(pK−K+)−ACPwgt(pπ−π+)=(0.30±0.91±0.61)%, where the first uncertainty is statistical and the second is systematic.[Figure not available: see fulltext.].