作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Bel, L. J.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Onderwater, C. J. G.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Geraci, A.; Gomes, A.; Rodrigues, F. Ferreira; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Rodrigues, B. Osorio] CBPF, Rio De Janeiro, Brazil.;[Hicheur, A.; De Paula, B. Souza; Lopes, J. H.; Goicochea, J. M. Otalora; Polycarpo, E.; Potterat, C.; Goebel, C.; Akiba, K. Carvalho; Baesso, C.; Francisco, O.; Guimaraes, V. Salustino; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Rodriguez, J. Molina; Torres, M. Cruz; Tostes, D. Martins; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Xie, Y.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie Mt Blanc, CNRS, LAPP, IN2P3, Annecy Le Vieux, France.
摘要：
A search for
$$ {B}_s^0\to {\overline{D}}^0{f}_0(980) $$
decays is performed using 3.0 fb1− of pp collision data recorded by the LHCb experiment during 2011 and 2012. The f0(980) meson is reconstructed through its decay to the π+π− final state in the mass window 900 MeV/c2 < m(π+π−) < 1080 MeV/c2. No significant signal is observed. The first upper limits on the branching fraction of
$$ \mathrm{\mathcal{B}}\left({B}_s^0\to {\overline{D}}^0{f}_0(980)\right)<3.1(3.4)\times 1{0}^{-6} $$
are set at 90 % (95 %) confidence level.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Bel, L. J.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Merk, M.; Onderwater, C. J. G.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Martinez Santos, D.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Gomes, A.; Osorio Rodrigues, B.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Ferreira Rodrigues, F.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Molina Rodriguez, J.; Polycarpo, E.; Potterat, C.; Goebel, C.; Souza De Paula, B.; Cruz Torres, M.; Akiba, K. Carvalho; Baesso, C.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Xie, Y.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie Mont Blanc, LAPP, CNRS, IN2P3, Annecy Le Vieux, France.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2015年75(4):1-12 ISSN：1434-6044
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Gomes, A.; Osorio Rodrigues, B.; Bediaga, I.; Massafferri, A.; Furfaro, E.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Santovetti, E.; Ferreira Rodrigues, F.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Carvalho Akiba, K.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Tostes, D. Martins; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Li, Y.; Zhang, Y.; Yuan, X.; Zhong, L.; Jing, F.; An, L.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
A search is presented for long-lived particles with a mass between 25 and 50
$$\mathrm{GeV}/\mathrm{c}^{2}$$
and a lifetime between 1 and 200
$$\mathrm{\,ps}$$
in a sample of proton–proton collisions at a centre-of-mass energy of
$$\sqrt{s}=7$$
TeV, corresponding to an integrated luminosity of 0.62
$$\text{ fb }^{-1}$$
, collected by the LHCb detector. The particles are assumed to be pair-produced by the decay of a standard model-like Higgs boson. The experimental signature of the long-lived particle is a displaced vertex with two associated jets. No excess above the background is observed and limits are set on the production cross-section as a function of the long-lived particle mass and lifetime.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; Oggero, S.; Kozlinskiy, A.; David, P. N. Y.; van Beuzekom, M.; Schiller, M.; Farinelli, C.; Hulsbergen, W.] Nikhef, Natl Inst Subat Phys, Amsterdam, Netherlands.;[Gomes, A.; Rodrigues, F. Ferreira; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.] CBPF, Rio De Janeiro, Brazil.;[Hicheur, A.; De Paula, B. Souza; Lopes, J. H.; Goicochea, J. M. Otalora; Polycarpo, E.; Potterat, C.; Akiba, K. Carvalho; Francisco, O.; Guimaraes, V. Salustino; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Tostes, D. Martins; Vieira, D.] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Li, Y.; Zhang, Y.; Yuan, X.; Zhong, L.; Jing, F.; An, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
A search for time-integrated CP violation in the Cabibbo-suppressed decay D-0 -> pi(-)pi(+)pi(0) ir is performed using for the first time an unbinned model-independent technique known as the energy test. Using proton-proton collision data, corresponding to an integrated luminosity of 2.0 fb(-1) collected by the LHCb detector at a centre-of-mass energy of root s = 8 TeV, the world's best sensitivity to CP violation in this decay is obtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of (2.6 +/- 0.5)%. (C) 2014 The Authors. Published by Elsevier B.V.
摘要：
A study of B and Bs meson decays into J/ψ η and J/ψ η′ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment and corresponding to 3.0 fb−1 of integrated luminosity. The decay B0 → J/ψ η′ is observed for the first time. The following ratios of branching fractions are measured:
$$ \begin{array}{c}\hfill \frac{\mathrm{\mathcal{B}}\left({\mathrm{B}}^0\to \mathrm{J}/{\uppsi \upeta}^{\prime}\right)}{\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{s}}^0\to\ \mathrm{J}/{\uppsi \upeta}^{\prime}\right)} = \left(2.28\pm 0.65\ \left(\mathrm{stat}\right)\pm 0.10\ \left(\mathrm{syst}\right)\pm 0.13\ \left(\mathrm{fs}/\mathrm{f}\mathrm{d}\right)\right)\times 1{0}^{-2},\hfill \\ {}\hfill \frac{\mathrm{\mathcal{B}}\left({\mathrm{B}}^0\to\ \mathrm{J}/\uppsi \upeta \right)}{\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{s}}^0\to\ \mathrm{J}/\uppsi \upeta \right)} = \left(1.85\pm 0.61\ \left(\mathrm{stat}\right)\pm 0.09\ \left(\mathrm{syst}\right)\pm 0.11\ \left(\mathrm{fs}/\mathrm{f}\mathrm{d}\right)\right)\times 1{0}^{-2},\hfill \end{array} $$
where the third uncertainty is related to the present knowledge of fs/fd, the ratio between the probabilities for a b quark to form a Bs or a B0 meson. The branching fraction ratios are used to determine the parameters of η − η′ meson mixing. In addition, the first evidence for the decay Bs → ψ(2S)η′ is reported, and the relative branching fraction is measured,
$$ \frac{\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{s}}^0\to\ \uppsi \left(2\mathrm{S}\right){\upeta}^{\prime}\right)}{\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{s}}^0\to\ \mathrm{J}/{\uppsi \upeta}^{\prime}\right)} = \left(38.7\pm 9.0\ \left(\mathrm{stat}\right)\pm 1.3\ \left(\mathrm{syst}\right)\pm 0.9\left(\mathrm{\mathcal{B}}\right)\right)\times 1{0}^{-2}, $$
where the third uncertainty is due to the limited knowledge of the branching fractions of J/ψ and ψ(2S) mesons.
作者：
Aaij, R.*;Beteta, C. Abellaen;Adeva, B.;Adinolfi, M.;Affolder, A.;...
期刊：
EUROPEAN PHYSICAL JOURNAL C,2015年75(7):1-12 ISSN：1434-6044
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Tuning, N.; Pellegrino, A.; van Tilburg, J.; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Heijne, V.; van Leerdam, J.; Aaij, R.; De Bruyn, K.; Oggero, S.; Kozlinskiy, A.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Gomes, A.; Bediaga, I.; Massafferri, A.; Furfaro, E.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Aaij, R.; Santovetti, E.; Ferreira Rodrigues, F.] CBPF, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Carvalho Akiba, K.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Szilard, D.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Li, Y.; Zhang, Y.; Zhong, L.; Jing, F.; Lazzeroni, C.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
The production of the
$$\eta _c (1S)$$
state in proton-proton collisions is probed via its decay to the
$$p\overline{p}$$
final state with the LHCb detector, in the rapidity range
$$2.0 < y < 4.5$$
and in the meson transverse-momentum range
$$p_\mathrm{T} > 6.5 \mathrm{{\,GeV/}{ c}} $$
. The cross-section for prompt production of
$$\eta _c (1S)$$
mesons relative to the prompt
$${{ J}}/{\psi } $$
cross-section is measured, for the first time, to be
$$\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.74\, \pm \,0.29\, \pm \, 0.28\, \pm \,0.18 _{{\mathcal{B}}}$$
at a centre-of-mass energy
$${\sqrt{s}} = 7 {~\mathrm{TeV}}$$
using data corresponding to an integrated luminosity of 0.7fb
$$^{-1}$$
, and
$$\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.60 \pm 0.29 \pm 0.25 \pm 0.17 _{{\mathcal{B}}}$$
at
$${\sqrt{s}} = 8 {~\mathrm{TeV}}$$
using 2.0fb
$$^{-1}$$
. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the
$$\eta _c (1S)$$
and
$${{ J}}/{\psi } $$
decays to the
$$p\overline{p}$$
final state. In addition, the inclusive branching fraction of
$${b} $$
-hadron decays into
$$\eta _c (1S)$$
mesons is measured, for the first time, to be
$${\mathcal{B}}( b {\rightarrow } \eta _c X ) = (4.88\, \pm \,0.64\, \pm \,0.29\, \pm \, 0.67 _{{\mathcal{B}}}) \times 10^{-3}$$
, where the third uncertainty includes also the uncertainty on the
$${{ J}}/{\psi } $$
inclusive branching fraction from
$${b} $$
-hadron decays. The difference between the
$${{ J}}/{\psi } $$
and
$$\eta _c (1S)$$
meson masses is determined to be
$$114.7 \pm 1.5 \pm 0.1 {\mathrm {\,MeV\!/}c^2} $$
.
作者机构：
[Fohl, K.; Di Canto, A.; Popov, D.; Durante, P.; Matev, R.; Ferro-Luzzi, M.; Cardoso, L. A. Granado; Joram, C.; Tuning, N.; Altarelli, M. Pepe; Vidal, X. Cid; Baldini, W.; Barschel, C.; Karacson, M.; Charpentier, Ph.; Kenzie, M.; Marino, P.; Ruf, T.; He, J.; Poikela, T.; Forty, R.; Corti, G.; Schmidt, B.; Gaspar, C.; Carvalho Akiba, K.; Otto, A.; Stahl, S.; Bettler, M. -O.; Linn, C.; Roiser, S.; Rauschmayr, N.; Barter, W.; Schopper, A.; Wyllie, K.; Langhans, B.; Mapelli, A.; Contu, A.; Lacarrere, D.; Couturier, B.; Leflat, A.; Cattaneo, M.; Archilli, F.; Jost, B.; Koppenburg, P.; Dettori, F.; Khanji, B.; Tonelli, D.; Rihl, M.; Lindner, R.; Dijkstra, H.; Schindler, H.; Haen, C.; Garcia, L. Castillo; Thomas, E.; Lohn, S.; Gallorini, S.; Golutvin, A.; Johnson, D.; Collins, P.; Jacobsson, R.; Neufeld, N.; Gligorov, V. V.; Schwemmer, R.; Buytaert, J.; Frei, C.; Aaij, R.; Mathe, Z.; D'Ambrosio, C.; Stagni, F.; Teubert, F.; Bondar, N.; Gys, T.; Sokoloff, M. D.; Wilkinson, G.; Closier, J.; Robbe, P.; Szczypka, P.; Frank, M.; van Herwijnen, E.; Fiore, M.; Guz, Yu.; Panman, J.; Perez, D. Campora; Easo, S.; Karbach, T. M.; Clemencic, M.; Williams, M.; Schiller, M.; Benson, S.; Alessio, F.; Coco, V.; Sridharan, S.; Trisovic, A.] European Org Nucl Res CERN, Geneva, Switzerland.;[Gomes, A.; Osorio Rodrigues, B.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Ferreira Rodrigues, F.] CBPF, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Carvalho Akiba, K.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Charles, M.; Zhang, L.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Pugatch, V.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie Mont Blanc, LAPP, CNRS IN2P3, Annecy Le Vieux, France.
通讯机构：
[Aaij, R.] E;European Org Nucl Res CERN, Geneva, Switzerland.
摘要：
We report a study of the suppressed B- -> DK-pi(+)pi(-) and favored B- -> D pi(-)pi(+)pi(-) decays, where the neutral D meson is detected through its decays to the K--/+pi(+/-) and CP -even K+K- and pi(+)pi(-) final states. The measurement is carried out using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb(-1). We observe the first significant signals in the CP - even final states of the D meson for both the suppressed B- -> DK-pi(+)pi(-) and favored B- -> D pi(-)pi(+)pi(-) modes, as well as in the doubly Cabibbo suppressed D -> K+pi(-) final state of the B- -> D pi(-)pi(+)pi(-) decay. Evidence for the suppressed decay B- -> DK-pi(+)pi(-), with D -> K+pi(-), is also presented. From the observed yields in the B- -> DK-pi(+)pi(-), B- -> D pi(-)pi(+)pi(-) and their charge conjugate decay modes, the most probable value of the weak phase gamma corresponds to gamma = (74(-19)(+20))degrees. This is one of the most precise single-measurement determinations of gamma to date.
期刊：
Journal of High Energy Physics,2015年2015(5):1-16 ISSN：1029-8479
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Bel, L. J.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Elsasser, Ch.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Gomes, A.; Rodrigues, F. Ferreira; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Rodrigues, B. Osorio] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; De Paula, B. Souza; Lopes, J. H.; Goicochea, J. M. Otalora; Polycarpo, E.; Potterat, C.; Akiba, K. Carvalho; Francisco, O.; Guimaraes, V. Salustino; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Di Domenico, A.; Tostes, D. Martins; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Yuan, X.; Zhong, L.; Jing, F.; An, L.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
Measurements are presented of the branching fractions of the decays B-s(0) -> D-s(-/+) K--/+ and B-0 -> Ds-K+ relative to the decays B-s(0) -> D-s(-)pi(+) and B-0 -> D-s(-)pi(+), respectively. The data used correspond to an integrated luminosity of 3.0 fb(-1) of proton-proton collisions. The ratios of branching fractions are B(B-s(0) -> D-s(-/+) K--/+)/B(B-s(0) -> D-s(-)pi(+)) = 0.0752 +/- 0.0015 +/- 0.0019 and B(B-0 -> Ds-K+)/B(B-0 -> D-pi(+)) = 0.0129 +/- 0.0005 +/- 0.0008, where the uncertainties are statistical and systematic, respectively.
作者机构：
Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil;Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;Center for High Energy Physics, Tsinghua University, Beijing, China;LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France;Clermont Université, Université Blaise Pascal, CNRS/IN2P3, Clermont-Ferrand, France
期刊：
Journal of High Energy Physics,2015年2015(6):1-22 ISSN：1029-8479
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Bel, L. J.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef, Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Gomes, A.; Osorio Rodrigues, B.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Ferreira Rodrigues, F.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Carvalho Akiba, K.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie Mont Blanc, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
The first measurement of decay-time-dependent CP asymmetries in the decay B-S(0) -> J/psi K-S(0) and an updated measurement of the ratio of branching fractions B(B-S(0) -> J/psi K-S(0))/B(B-0 -> J/psi K-S(0)) are presented. The results are obtained using data corresponding to an integrated luminosity of 3.0 fb(-1) of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The results on the CP asymmetries are A(Delta Gamma)(B-S(0) -> J/psi K-S(0)) = 0.49 +/- (0.77)(0.65)(stat) +/- 0.06(syst), C-dir(B-S(0) -> J/psi K-S(0)) = -0.28 +/- 0.41(stat) +/- 0.08(syst), S-mix(B-S(0) -> J/psi K-S(0)) = -0.08 +/- 0.40(stat) +/- 0.08(syst). The ratio B(B-S(0) -> J/psi K-S(0))/B(B-0 -> J/psi K-S(0)) is measured to be 0.0431 +/- 0.0017(stat) +/- 0.0012(syst) +/- 0.0025(f(s)/f(d)), where the last uncertainty is due to the knowledge of the B-S(0) and B-0 production fractions.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Bel, L. J.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Gomes, A.; Osorio Rodrigues, B.; Rodrigues, F. Ferreira; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; De Paula, B. Souza; Otalora Goicochea, J. M.; Lopes, J. H.; Polycarpo, E.; Potterat, C.; Akiba, K. Carvalho; Francisco, O.; Guimaraes, V. Salustino; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Tostes, D. Martins; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie Mont Blanc, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
The B- -> D+K-pi(-) decay is observed in a data sample corresponding to 3.0 fb(-1) of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be B(B- -> D+K-pi(-)) = (7.31 +/- 0.19 +/- 0.22 +/- 0.39) x 10(-5) where the uncertainties are statistical, systematic and from the branching fraction of the normalization channel B- -> D+pi(-)pi(-), respectively. An amplitude analysis of the resonant structure of the B- -> D+K-pi(-) decay is used to measure the contributions from quasi-two-body B- -> D-0* (2400)K-0(-), B- -> D-2* (2460)K-0(-), and B- -> D-J* (2760)K-0(-) decays, as well as from nonresonant sources. The D-J* (2760)(0) resonance is determined to have spin 1.
期刊：
Journal of High Energy Physics,2015年2015(4):1-19 ISSN：1029-8479
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Ketel, T.; Tuning, N.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Ciezarek, G.; Aaij, R.; Martinez Santos, D.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Gomes, A.; Osorio Rodrigues, B.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Aaij, R.; Ferreira Rodrigues, F.] CBPF, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Akiba, K. Carvalho; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Zhang, Y.; Zhong, L.; Jing, F.; An, L.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
Time-dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays D0 → K−K+ and D0 → π
−
π
+
are measured in pp collision data corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial state as D0 or
$$ {\overline{D}}^0 $$
. The asymmetries in effective lifetimes between D0 and
$$ {\overline{D}}^0 $$
decays, which are sensitive to indirect CP violation, are determined to be
$$ \begin{array}{c}\hfill {A}_{\varGamma}\left({K}^{-}{K}^{+}\right)=\left(-0.134\pm 0.0{77}_{-0.034}^{-0.026}\right)\%,\hfill \\ {}\hfill {A}_{\varGamma}\left({\pi}^{-}{\pi}^{+}\right) = \left(-0.092\pm 0.{145}_{-0.033}^{-0.025}\right)\%,\hfill \end{array} $$
where the first uncertainties are statistical and the second systematic. This result is in agreement with previous measurements and with the hypothesis of no indirect CP violation in D0 decays.
作者机构：
[Wilschut, H. W.; Jans, E.; Ketel, T.; Tuning, N.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; Santos, D. Martinez; Merk, M.; Onderwater, C. J. G.; Ali, S.; Van Tilburg, J.; Koppenburg, P.; Tsopelas, P.; Van Leerdam, J.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; Raven, G.; Ciezarek, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; David, P. N. Y.; van Beuzekom, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Gomes, A.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Ferreira Rodrigues, F.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Hicheur, A.; Otalora Goicochea, J. M.; Lopes, J. H.; Polycarpo, E.; Potterat, C.; Goebel, C.; Souza De Paula, B.; Akiba, K. Carvalho; Baesso, C.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Rodriguez, J. Molina; Martin Tostes, D.; Torres, M. Cruz; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Li, Y.; Zhang, Y.; Yuan, X.; Zhong, L.; Jing, F.; An, L.; Xie, Y.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
A search is performed for heavy long-lived charged particles using 3.0
$${\rm fb}^{-1}$$
of proton–proton collisions collected at
$$\sqrt{s}$$
$$=$$
7 and 8TeV with the LHCb detector. The search is mainly based on the response of the ring imaging Cherenkov detectors to distinguish the heavy, slow-moving particles from muons. No evidence is found for the production of such long-lived states. The results are expressed as limits on the Drell–Yan production of pairs of long-lived particles, with both particles in the LHCb pseudorapidity acceptance,
$$1.8 < \eta < 4.9$$
. The mass-dependent cross-section upper limits are in the range 2–4fb (at 95% CL) for masses between 14 and 309
$${\mathrm {\,GeV\!/}c^2}$$
.
作者机构：
[Zhang, Lizhi; Li, Jie] Cent China Normal Univ, Coll Chem, Inst Environm Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China.;[Li, Jie; Yu, Ying; Li, Yujie] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, Lizhi] C;Cent China Normal Univ, Coll Chem, Inst Environm Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China.
摘要：
We prepared Bi3O4Cl single-crystalline nanosheets with high {001} facet exposure percentages and demonstrated that their photoreactivity strongly depended on the magnitude of the internal electric field (IEF), which was correlated with the {001} facet exposure percentage. More {001} facet exposure could induce the generation of stronger IEF, which favored the photogenerated charge separation and transfer, and thus enhancing the photoreactivity.
期刊：
Journal of High Energy Physics,2014年2014(10):1-16 ISSN：1029-8479
通讯作者：
Aaij, R.
作者机构：
[Jans, E.; Ketel, T.; van den Brand, J.; Tuning, N.; Tolk, S.; Pellegrino, A.; Syropoulos, V.; van Tilburg, J.; Santos, D. Martinez; Merk, M.; Ali, S.; Koppenburg, P.; Tsopelas, P.; Snoek, H.; de Vries, J. A.; Koopman, R. F.; Heijne, V.; van Leerdam, J.; Raven, G.; Aaij, R.; Lambert, R. W.; De Bruyn, K.; Oggero, S.; Kozlinskiy, A.; David, P. N. Y.; van Beuzekom, M.; Schiller, M.; Farinelli, C.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Hicheur, A.; Gomes, A.; Bediaga, I.; Massafferri, A.; Rodrigues, A. B.; dos Reis, A. C.; De Miranda, J. M.; Ferreira Rodrigues, F.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Otalora Goicochea, J. M.; Lopes, J. H.; Martins Tostes, D.; Carvalho Akiba, K.; Polycarpo, E.; Potterat, C.; Souza De Paula, B.; Francisco, O.; De Paula, L.; Nasteva, I.; Gandelman, M.; Amato, S.; Rangel, M. S.; Salustino Guimaraes, V.; Vieira, D.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Li, Y.; Zhang, Y.; Yuan, X.; Zhong, L.; Jing, F.; An, L.; Lu, H.] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China.;[Chefdeville, M.; Marchand, J. F.; Tisserand, V.; Decamp, D.; Ghez, Ph.; Qian, W.; Beaucourt, L.; Tournefier, E.; Lespinasse, M.; Pietrzyk, B.; Lees, J. -P.; T'Jampens, S.; Minard, M. -N.; Deleage, N.] Univ Savoie, CNRS, IN2P3, LAPP, Annecy Le Vieux, France.
摘要：
The production of χ
b
mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of
$$ \sqrt{s} $$
=7 and 8 TeV and corresponding to an integrated luminosity of 3.0 fb−1. The χ
b
mesons are identified through their decays to ϒ(1S)γ and ϒ(2S)γ using photons that converted to e
+
e
− pairs in the detector. The relative prompt production rate of χ
b1(1P) and χ
b2(1P) mesons is measured as a function of the ϒ(1S) transverse momentum in the χ
b
rapidity range 2.0 < y <4.5. A precise measurement of the χ
b
(3P) mass is also performed. Assuming a mass splitting between the χ
b1(3P) and the χ
b2(3P) states of 10.5 MeV/c2, the measured mass of the χ
b1(3P) meson is
$$ m\left({\chi}_{b1}(3P)\right)=10515.{7}_{-3.9}^{+2.2}{\left(\mathrm{stat}\right)}_{-2.1}^{+1.5}\left(\mathrm{syst}\right)\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^2. $$
