摘要：
The natural water has frequency dispersion and its permittivity is also related to temperature, which are important factors to design temperature insensitive absorber at microwave frequency. Here, a water-based metamaterial absorber which is fabricated by 3D-printing is proposed. The absorber can perform stably at different temperatures and it also shows 90% absorption in the frequency range of 7.9-21.7 GHz. The experiment proves that the absorber can work at a wide incident angle and is polarization insensitive. Based on these features, the water-based absorber could be applied to various electromagnetic scenarios such as stealth technology and electromagnetic compatibility in temperature-variable environment. (C) 2019 Elsevier B.V. All rights reserved.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
Journal of High Energy Physics,2019年2019(10):1-21 ISSN：1029-8479
通讯作者：
dos Reis, A. C.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Dufour, L.; Feo, M.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; Jadallah Aoude, R. Tourinho; Bediaga, I.; dos Reis, A. C.] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Potterat, C.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Robilotta, M. R.] Univ Sao Paulo, Sao Paulo, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; An, L.; Davis, A.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.
通讯机构：
[dos Reis, A. C.] C;Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil.
摘要：
A search for the
$$ {\Xi}_{cc}^{++} $$
baryon through the
$$ {\Xi}_{cc}^{++} $$
→ D+pK−π+ decay is performed with a data sample corresponding to an integrated luminosity of 1.7 fb−1 recorded by the LHCb experiment in pp collisions at a centre-of-mass energy of 13 TeV. No significant signal is observed in the mass range from the kinematic threshold of the decay to 3800 MeV/c2. An upper limit is set on the ratio of branching fractions
$$ \mathrm{\mathcal{R}}=\frac{\mathrm{\mathcal{B}}\left({\Xi}_{cc}^{++}\to {D}^{+}{pK}^{-}{\pi}^{+}\right)}{\mathrm{\mathcal{B}}\left({\Xi}_{cc}^{++}\to {\Lambda}_c^{+}{K}^{-}{\pi}^{+}{\pi}^{+}\right)} $$
with ℛ < 1.7 (2.1) × 10−2 at the 90% (95%) confidence level at the known mass of the
$$ {\Xi}_{cc}^{++} $$
state.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
PHYSICAL REVIEW D,2019年100(11) ISSN：2470-0010
通讯作者：
Vieites Diaz, M.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Dufour, L.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; Bediaga, I.; dos Reis, A. C.] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Davis, A.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Li, Y.; Zhang, Y.; Wang, J.] Ihep, Beijing, Peoples R China.
通讯机构：
[Vieites Diaz, M.] U;Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain.
摘要：
The production fraction of the B-c(-) meson with respect to the sum of B- and (B) over bar (0) mesons is measured in both 7 and 13 TeV center-of-mass (c.m.) energy pp collisions produced by the Large Hadron Collider (LHC), using the LHCb detector. The rate, approximately 3.7 per mine, does not change with energy, but shows a transverse momentum dependence. The B-c(-) - B-c(+) production asymmetry is also measured and is consistent with zero within the determined statistical and systematic uncertainties of a few percent.
作者：
Aaij, R.;Abellan Beteta, C.;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
Journal of High Energy Physics,2019年2019(7):1-31 ISSN：1029-8479
通讯作者：
Belyaev, I.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Pajero, T.; Ferreres Sole, S.; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef, Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; Bediaga, I.; dos Reis, A. C.] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Amato, S.] Univ Fed Rio de Janeiro, UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Luo, Y.; Zeng, M.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Beliy, N.; Lyu, X.; Szymanski, M.; Xu, Q.; Huang, W.; Li, P. -R.; He, J.; Saur, M.; Qian, W.; Qin, J.; Zheng, Y.; Vieira, D.] Univ Chinese Acad Sci, Beijing, Peoples R China.
通讯机构：
[Belyaev, I.] N;NRC KI, ITEP, Moscow, Russia.
关键词：
B physics;Hadron-Hadron scattering (experiments)
摘要：
The
$$ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$
and
$$ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$
decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb−1. An untagged and timeintegrated amplitude analysis of B
()
0
→ (K+π−)(K−π+) decays in two-body invariant mass regions of 150 MeV/c2 around the K∗0 mass is performed. A stronger longitudinal polarisation fraction in the
$$ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$
decay, fL = 0.724 ± 0.051 (stat) ± 0.016 (syst), is observed as compared to fL = 0.240 ± 0.031 (stat) ± 0.025 (syst) in the
$$ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$
decay. The ratio of branching fractions of the two decays is measured and used to determine
$$ \mathrm{\mathcal{B}}\left({B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\right)=\left(8.0\pm 0.9\left(\mathrm{stat}\right)\pm 0.4\left(\mathrm{syst}\right)\right)\times {10}^{-7} $$
.
作者：
Aaij, R.*;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
PHYSICAL REVIEW D,2019年100(3) ISSN：2470-0010
通讯作者：
Aaij, R.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; Kotriakhova, S.; De Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; Dufour, L.; Jans, E.; Beiter, A.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Van Beuzekom, M.; Archilli, F.; Van Tilburg, J.; Koppenburg, P.; Gras, C. Sanchez; Van Veghel, M.; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Massafferri, A.; De Miranda, J. M.; Torres, M. Cruz; Gomes, A.; Dos Reis, A. C.; Lavra, L. Soares; Bediaga, I.; Aoude, R. Tourinho Jadallah] CBPF, Rio De Janeiro, Brazil.;[De Paula, B. Souza; Lopes, J. H.; Marinho, F. Da Cunha; Goicochea, J. M. Otalora; Polycarpo, E.; Gandelman, M.; Gobel, C.; Rangel, M. S.; Rodrigues, F. Ferreira; Akiba, K. Carvalho; Guimaraes, V. Salustino; De Paula, L.; Nasteva, I.; Amato, S.; De Oliveira, L. Silva] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Liu, G.; Gandini, P.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Luo, Y.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Belin, S.; Lyu, X.; Szymanski, M.; Xu, Q.; Huang, W.; Li, P. -R.; He, J.; Saur, M.; Qian, W.; Qin, J.; Zheng, Y.; Vieira, D.] Univ Chinese Acad Sci, Beijing, Peoples R China.
摘要：
The production fractions of (B) over bar (0)(s) and Lambda(0)(b) hadrons, normalized to the sum of B- and (B) over bar (0) fractions, arc measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67 fb(-1). These ratios, averaged over the b hadron transverse momenta from 4 to 25 GeV and pseudorapidity from 2 to 5, are 0.122 +/- 0.006 for (B) over bar (0)(s) and 0.259 +/- 0.018 for Lambda(0)(b) where the uncertainties arise from both statistical and systematic sources. The Lambda(0)(b) ratio depends strongly on transverse momentum, while the (B) over bar (0)(s) ratio shows a mild dependence. Neither ratio shows variations with pseudorapidity. The measurements are made using semileptonic decays to minimize theoretical uncertainties. In addition, the ratio of D+ to D-0 mesons produced in the sum of (B) over bar (0) and B- semileptonic decays is determined as 0.359 +/- 0.006 +/- 0.009, where the uncertainties are statistical and systematic.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinol, M.;Aidala, C. A.;...
期刊：
Journal of High Energy Physics,2019年2019(12):1-34 ISSN：1029-8479
通讯作者：
Gabriel, E.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; Heijho, K.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Kostiuk, I; Jans, E.; DallOcco, E.; Bel, L. J.; Esen, S.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; van Veghel, M.; Butter, J. S.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sole, S. Ferreres; Sierra, C. Vazquez; Govorkova, E.; Schubiger, M.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, I; Gomes, A.; dos Reis, A. C.; Bediaga, I] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Nasteva, I; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Amato, S.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, S.; Jiang, F.; Xu, A.; Ren, Z.; Xu, L.; Tang, Z.; Wang, J.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Luo, Y.; Mu, H.; Zeng, M.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Beliy, N.; Zhou, Y.; Li, P-R; Lyu, X.; Szymanski, M.; Xu, Q.; Huang, W.; He, J.; Saur, M.; Qian, W.; Qin, J.; Zheng, Y.; Xiang, Z.; Vieira, D.] Univ Chinese Acad Sci, Beijing, Peoples R China.
摘要：
A measurement of the time-dependent CP-violating asymmetry in
$$ {B}_s^0\to \phi \phi $$
decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies
$$ \sqrt{s} $$
= 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000
$$ {B}_s^0\to \phi \phi $$
decays is obtained. The CP-violating phase
$$ {\phi}_s^{s\overline{s}s} $$
is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the ϕϕ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in
$$ \overline{b}\to \overline{s}s\overline{s}s $$
transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be
$$ \mathcal{B}\left({B}^0\to \phi \phi \right)<2.7\times {10}^{-8} $$
at 90 % confidence level.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
EUROPEAN PHYSICAL JOURNAL C,2019年79(6):ARTN 537 ISSN：1434-6044
通讯作者：
Aaij, R
作者机构：
CERN, CH-1211 Geneva 23, Switzerland;[Bediaga, I.; Cruz Torres, M.; De Miranda, J. M.; Gomes, A.; Massafferri, A.; dos Reis, A. C.; Soares Lavra, l.; Tourinho Jadallah Aoude, R.] CBPF, Rio De Janeiro, Brazil;[Amato, S.; Carvalho Akiba, K.; Da Cunha Marinho, F.; De Paula, L.; Ferreira Rodrigues, F.; Gandelman, M.; Lopes, J. H.; Nasteva, I.; Otalora Goicochea, J. M.; Polycarpo, E.; Potterat, C.; Rangel, M. S.; Silva de Oliveira, L.; Souza De Paula, B.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil;[An, L.; Chen, C.; Davis, A.; Gan, Y.; Gao, Y.; Gu, C.; Jiang, F.; Liu, X.; Ren, Z.; Sun, J.; Tang, Z.; Wang, M.; Xu, A.; Xu, Z.; Yang, Z.; Zhang, L.; Zhang, W. C.; Zhu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China;[Li, Y.; Wang, J.] Inst High Energy Phys Ihep, Beijing, Peoples R China
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
EUROPEAN PHYSICAL JOURNAL C,2019年79(9):ARTN 745 ISSN：1434-6044
通讯作者：
Aaij, R
作者机构：
[Bediaga, I.; Cruz Torres, M.; De Miranda, J. M.; Gomes, A.; dos Reis, A. C.; Soares Lavra, L.] CBPF, Rio De Janeiro, Brazil;[Amato, S.; Carvalho Akiba, K.; Da Cunha Marinho, F.; De Paula, L.; Gambetta, S.; Lopes, J. H.; Nasteva, I.; Otalora Goicochea, J. M.; Polycarpo, E.; Rangel, M. S.; Silva de Oliveira, L.; Souza De Paula, B.] Univ Fed Rio De Janeiro UFRJ, Rio De Janeiro, Brazil;[Davis, A.; Gallorini, S.; Gandini, P.; Liu, X.; Sun, J.; Xu, A.; Xu, Z.; Yang, Z.; Zhang, L.; Zhu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China;[Chefdeville, M.; Decamp, D.; Ghez, Ph.; Olloqui, E. Picatoste; Reboud, M.; T'Jampens, S.] Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS, IN2P3,LAPP, Annecy, France;[Ajaltouni, Z.; Cogneras, E.; Deschamps, O.; Gazzoni, G.; Hadjivasiliou, C.; Lefrancois, J.; Perret, P.; Quintana, B.; Tuning, N.; Verlage, T. A.] Univ Blaise Pascal, Clermont Univ, LPC, CNRS,IN2P3, Clermont Ferrand, France
通讯机构：
[Aaij, R.] C;CERN, European Org Nucl Res, Geneva, Switzerland.
摘要：
Asearch forCP violation in charmless four-body decays of Lambda(0)(b) and Xi(0)(b) baryons with a proton and three charged mesons in the final state is performed. To cancel out production and detection charge-asymmetry effects, the search is carried out by measuring the difference between the CP asymmetries in a charmless decay and in a decay with an intermediate charmed baryon with the same particles in the final state. The data sample used was recorded in 2011 and 2012 with the LHCb detector and corresponds to an integrated luminosity of 3 fb(-1). A total of 18 CP asymmetries are considered, either accounting for the full phase space of the decays or exploring specific regions of the decay kinematics. No significant CP-violation effect is observed in any of the measurements.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
Journal of High Energy Physics,2019年2019(4):1-36 ISSN：1029-8479
通讯作者：
dos Reis, A. C.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Dufour, L.; Feo, M.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Gomes, A.; Jadallah Aoude, R. Tourinho; Bediaga, I.; dos Reis, A. C.; Soares Lavra, l.] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Potterat, C.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Robilotta, M. R.] Univ Sao Paulo, Sao Paulo, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; An, L.; Davis, A.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.
通讯机构：
[dos Reis, A. C.] C;Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil.
关键词：
Charm physics;Hadron-Hadron scattering (experiments);Particle and resonance production
摘要：
A measurement of the charm-mixing parameter y_{CP} using D^{0}-->K^{+}K^{-}, D^{0}-->pi^{+}pi^{-}, and D^{0}-->K^{-}pi^{+} decays is reported. The D^{0} mesons are required to originate from semimuonic decays of B^{-} and B[over ]^{0} mesons. These decays are partially reconstructed in a data set of proton-proton collisions at center-of-mass energies of 7 and 8 TeV collected with the LHCb experiment and corresponding to an integrated luminosity of 3 fb^{-1}. The y_{CP} parameter is measured to be (0.57+/-0.13(stat)+/-0.09(syst))%, in agreement with, and as precise as, the current world-average value.
作者：
Aaij, R.*;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
PHYSICAL REVIEW D,2019年99(5) ISSN：2470-0010
通讯作者：
Aaij, R.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Kostiuk, I; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; dos Reis, A. C.; Bediaga, I] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Nasteva, I; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Luo, Y.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Li, Y.; Wang, J.] Inst High Energy Phys, Beijing, Peoples R China.
期刊：
Journal of High Energy Physics,2019年2019(3):1-24 ISSN：1029-8479
通讯作者：
Aaij, R.
作者机构：
[Ketel, T.; Maltsev, T.; Aaij, R.; Syropoulos, V.; Raven, G.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Gomes, A.; Molina Rodriguez, J.; Bediaga, I.; dos Reis, A. C.; Soares Lavra, l.] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Hicheur, A.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Potterat, C.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Li, T.; Tang, Z.; Xu, Z.; Wang, M.; Sun, J.; Zhu, X.; Likhomanenko, T.; Davis, A.; Zhang, L.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Chefdeville, M.; Decamp, D.; Reboud, M.; Beaucourt, L.; T'Jampens, S.; Marchand, J. F.; Xu, Z.; Ghez, Ph.; Tournefier, E.; Pietrzyk, B.; Minard, M. -N.] Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IN2P3,LAPP, Annecy, France.
摘要：
The branching fractions of the doubly Cabibbo-suppressed decays D+ → K−K+K+, D+ → π−π+K+ and D
+
→ π−K+K+ are measured using the decays D+ → K−π+π+ and D
+
→ K−K+π+ as normalisation channels. The measurements are performed using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb−1. The results are
$$ \begin{array}{c}\hfill \frac{\mathrm{\mathcal{B}}\left({D}^{+}\to {K}^{-}{K}^{+}{K}^{+}\right)}{\mathrm{\mathcal{B}}\left({D}^{+}\to {K}^{-}{\pi}^{+}{\pi}^{+}\right)} = \left(6.541\pm 0.025\pm 0.042\right)\times {10}^{-4},\hfill \\ {}\hfill \frac{\mathrm{\mathcal{B}}\left({D}^{+}\to\ {\pi}^{-}{\pi}^{+}{K}^{+}\right)}{\mathrm{\mathcal{B}}\left({D}^{+}\to {K}^{-}{\pi}^{+}{\pi}^{+}\right)}=\left(5.231\pm 0.009\pm 0.023\right)\times {10}^{-3},\hfill \\ {}\hfill \frac{\mathrm{\mathcal{B}}\left({D}_s^{+}\to\ {\pi}^{-}{K}^{+}{K}^{+}\right)}{\mathrm{\mathcal{B}}\left({D}_s^{+}\to {K}^{-}{K}^{+}{\pi}^{+}\right), } = \left(2.372\pm 0.024\pm 0.025\right)\times {10}^{-3},\hfill \end{array} $$
where the uncertainties are statistical and systematic, respectively. These are the most precise measurements up to date.
