75 research outputs found
Measurement of the B0–B0 oscillation frequency Δmd with the decays B0→D−π+ and B0→ J/ψK∗0
No full textThe B
0
–B
0
oscillation frequency Δmd is measured by the LHCb experiment using a dataset corresponding
to an integrated luminosity of 1.0 fb−1
of proton–proton collisions at √
s = 7 TeV, and is found to be
Δmd
=0.5156±0.0051 (stat.)±0.0033 (syst.) ps−1
. The measurement is based on results from analyses
of the decays B
0
→ D
−π
+ (D
−
→ K
+π
−π
−) and B
0
→ J/ψK
∗0
(J/ψ →μ
+μ
−,K
∗0
→ K
+π
−) and
their charge conjugated modes
Search for the decay Bs0→D*∓π±
No full textA search for the decay Bs0→D*∓π± is presented using a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions collected by LHCb. This decay is expected to be mediated by a W-exchange diagram, with little contribution from rescattering processes, and therefore a measurement of the branching fraction will help us to understand the mechanism behind related decays such as Bs0→π+π- and Bs0→DD̅ . Systematic uncertainties are minimized by using B0→D*∓π± as a normalization channel. We find no evidence for a signal, and set an upper limit on the branching fraction of B(Bs0→D*∓π±)<6.1(7.8)×10-6 at 90% (95%) confidence level
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
No full textThe asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 K_S pi+ decay is negligible. No significant dependence on \eta or p_T is observed
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Observation of the suppressed ADS modes B± → [π±K-/+ π+π-]D K± and B± → [π± K-/+π+π-]Dπ±
No full textAn analysis of and B± → DK± and B± → Dπ±
decays is presented where the D meson is reconstructed in the four-body final state K± π-/+π+π-. Using LHCb data corresponding to an integrated luminosity of 1.0 fb-1, first observations are made of the suppressed ADS modes B± →[π± K-/+π+π-]DK± and B± → [π± K-/+π+π-]Dπ± with a significance of 5.1 sigma and greater than 10 sigma, respectively. Measurements of CP asymmetries and CP-conserving ratios of partial widths from this family of decays are also performed. The magnitude of the ratio between the suppressed and favoured B± → DK ± amplitudes is determined to be rKB = 0.097 ± 0.011
Prompt charm production in pp collisions at √<span style="text-decoration:overline">s</span>=7 TeV
No full textCharm production at the LHC in pp collisions at s√=7 TeV is studied with the LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, D+s→ϕ(K−K+)π+, Λ+c→pK−π+, and their charge conjugates are analysed in a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT are measured for prompt production of the five charmed hadron species in bins of transverse momentum and rapidity in the region 0<pT<8 GeV/c and 2.0<y<4.5. Theoretical predictions are compared to the measured differential cross-sections. The integrated cross-sections of the charm hadrons are computed in the above pT-y range, and their ratios are reported. A combination of the five integrated cross-section measurements gives
σ(cc¯)pT<8 GeV/c,2.0<y<4.5=1419±12(stat)±116(syst)±65(frag) μb,
where the uncertainties are statistical, systematic, and due to the fragmentation functions
Katalog der Bibliothek des Österreichischen Alpenklubs
No full textKATALOG DER BIBLIOTHEK DES ÖSTERREICHISCHEN ALPENKLUBS
Katalog der Bibliothek des Österreichischen Alpenklubs (-)
Katalog der Bibliothek des Österreichischen Alpenklubs (1) ([I])
Cover ( - )
Title page ([I])
Bestimmungen für die Benützung der Bibliothek. ([III])
Inhalts-Verzeichnis. ([V])
I. Zeitschriften und Jahrbücher. ([1])
II. Andere Veröffentlichungen alpiner Vereine. (3)
III. Allgemeines über die Alpen. (4)
IV. Westalpen. (6)
a) Allgemeines. (6)
b) Berner, Glarner und Urner Alpen. (7)
c) Graubündner Alpen, Albula-u. Bernina-Gruppe, Engadin. (9)
d) Penninische (Walliser), Lepontinische, Tessiner, Grajische und See-Alpen. (10)
e) Mont-Blanc-Gruppe. (12)
f) Dauphiné. Savoyer Alpen. Pyrenäen. Französ. Mittelgebirge. (13)
V. Ostalpen. (14)
a) Allgemeines. (14)
b) Algäu, Bayr. Hochland, Wettersteingebirge, Vorarlberg. (17)
c) Karwendel- u. Kaisergebirge, Rofangruppe, Kitzbühler Alpen, Loferer- u. Leoganger Steinberge, Berchtesgadner Alpen. (18)
d) Salzburger Kalkalpen, Salzkammergut, Dachsteingruppe, Totes Gebirge. (20)
e) Niederösterreich. u. Steirische Alpen, Ennstaler Alpen. (20)
f) Silvretta-, Ferwall-, Ötztaler-, Stubaier-, Zillertaler- u. Rieserferner-Gruppe. (23)
g) Venediger-, Glockner-, Schober-, Ankogel- u. Goldberg-Gruppe, Niedere Tauern. (24)
h) Bergamasker Alpen, Ortler-. Adamello-, Presanella. u. Brentagruppe, Gardasee. (25)
i) Dolomiten. (27)
k) Julische u. Karnische Alpen. Karawanken. (28)
VI. Ausseralpine Gebiete. (29)
a) Europa. (29)
b) Kaukasus. (33)
c) Asien. (33)
d) Afrika. (33)
e) Amerika. (34)
f) Australien und die Südsee. (34)
g) Polargebiete. (35)
VII. Sport. (35)
a) Alpinismus. (35)
b) Wintersport. (36)
c) Diverse Sportliteratur. (37)
VIII. Geographie. Kartographie. (38)
IX. Geschichtliches. Sagen. Volkskunde. (38)
X. Naturwissenschaften. (39)
XI. Photographie. (41)
XII. Biographien. (42)
XIII. Unterhaltungs-Literatur. (42)
XIV. Karten. (49)
a) Westalpen. (49)
b) Ostalpen. (52)
c) Algäu, Bayr. Hochland, Wettersteingebirge, Vorarlberg, Karwendel-u. Kaisergebirge. Kitzbühler Alpen, Berchtesgadner Alpen. (53)
d) Salzburger Kalkalpen, Dachsteingruppe, Salzkammergut, Totes Gebirge. (53)
e) Niederösterr. u. Steirische Alpen, Ennstaler Alpen. (54)
f) Silvretta-, Ferwall-, Ötztaler-, Stubaier-, Zillertaler- u. Rieserferner-Gruppe. (55)
g) Venediger-, Glockner-, Schober-, Goldberg- u. Ankogel-Gruppe. (55)
h) Ortler-. Adamello-, Presanella. u. Brenta-Gruppe, Gardasee. (56)
i) Dolomiten. (56)
k) Julische und Karnische Alpen. (56)
l) Ausseralpine Gebiete. (57)
XV. Panoramen. (57)
a) Westalpen. (57)
b) Ostalpen. (57)
XVI. Ansichten. (59)
Cover ( -
Observation of the decay Bºs → D-ºφ
No full textFirst observation of the decay Bºs → D-ºφ
is reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. The significance of the signal is 6.5 standard deviations. The branching fraction is measured relative to that of the decay Bºs → D-ºK-*º
to be
B(B0s
→D0φ)
B(B0s
→D0K∗0)
= 0.069±0.013 (stat)±0.007 (syst).
The first measurement of the ratio of branching fractions for the decays B0s
→ D0K∗0 and B0 → D0K∗0
is found to be
B(B0s
→D0K∗0)
B(B0→D0K∗0)
= 7.8±0.7 (stat)± 0.3 (syst)± 0.6 ( fs/ fd),
where the last uncertainty is due to the ratio of the B0s
and B0 fragmentation fractions
First observation of the decays B0 -> D+K-π+π- and B- -> D0K-π+π-
No full textFirst observations of the Cabibbo-suppressed decays B0→D+K-π+π- and B-→D0K-π+π- are reported using 35pb -1 of data collected with the LHCb detector. Their branching fractions are measured with respect to the corresponding Cabibbo-favored decays, from which we obtain B(B0→D+K-π+π-)/B(B0→D+π-π+π-)=(5.9±1.1±0.5) ×10-2 and B(B-→D0K-π+π-)/B(B-→D0π-π+π-)=(9.4±1.3±0.9) ×10-2, where the uncertainties are statistical and systematic, respectively. The B-→D0K-π+π- decay is particularly interesting, as it can be used in a similar way to B-→D0K- to measure the Cabibbo-Kobayashi-Maskawa phase γ
Measurement of the CKM angle gamma from a combination of B->Dh analyses
No full textA combination of three LHCb measurements of the CKM angle gamma is presented. The decays B->DK and B->Dpi are used, where D denotes an admixture of D0 and D0-bar mesons, decaying into K+K-, pi+pi-, K+-pi-+, K+-pi-+pi+-pi-+, KSpi+pi-, or KSK+K- final states. All measurements use a dataset corresponding to 1.0 fb-1 of integrated luminosity. Combining results from B->DK decays alone a best-fit value of gamma = 72.0 deg is found, and confidence intervals are set gamma in [56.4,86.7] deg at 68% CL, gamma in [42.6,99.6] deg at 95% CL. The best-fit value of gamma found from a combination of results from B->Dpi decays alone, is gamma = 18.9 deg, and the confidence intervals gamma in [7.4,99.2] deg or [167.9,176.4] deg at 68% CL, are set, without constraint at 95% CL. The combination of results from B->DK and B->Dpi decays gives a best-fit value of gamma = 72.6 deg and the confidence intervals gamma in [55.4,82.3] deg at 68% CL, gamma in [40.2,92.7] deg at 95% CL are set. All values are expressed modulo 180 deg, and are obtained taking into account the effect of D0-D0bar mixing
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