J. Merkel

Measurement of b-hadron masses

LHCb Collaboration, R. Aaij, C. Abellan Beteta +583

Measurements of b-hadron masses are performed with the exclusive decay modes B+ -> J/psi K+, B0 -> J/psi K*0, B0 -> J/psi K0S, B0_s -> J/psi phi and Lambda_b -> J/psi Lambda using…

Search for the rare decays Bs -->mumu and Bd -->mumu

LHCb Collaboration, R. Aaij, B. Adeva +542

A search for the decays Bs-->mumu and Bd-->mumu is performed with about 37 pb^{-1} of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment at the Large Hadron Collider…

Measurement of the $B_{s}^{0} \to J / I ¨ K_{S}^{0}$ branching fraction

LHCb collaboration, R. Aaij, C. Abellan Beteta +594

The $B_{s}^{0} \to J / I ¨ K_{S}^{0}$ branching fraction is measured in a data sample corresponding to 0.41 $f b^{- 1}$ of integrated luminosity collected with the LHCb detector at the LHC. This c…

Searches for Majorana neutrinos in B- decays

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

Searches for heavy Majorana neutrinos in B- decays in final states containing hadrons plus a Î¼- Î¼- pair have been performed using 0.41/fb of data collected with the LHCb detector…

Search for the rare decay KS -> mu+ mu-

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

A search for the decay KS -> mu+ mu- is performed, based on a data sample of 1.0 fb^-1 of pp collisions at \sqrt{s}=7 TeV collected by the LHCb experiment at the Large Hadron Colli…

hep-ex2010

Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region

LHCb Collaboration, R. Aaij, C. Abellan Beteta +628

Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the b anti-b production cross-section in proton-proton collisions at a centre-of-mass ene…

Measurement of the fraction of \Y1S originating from \chib1P decays in $pp$ collisions at $\sqrt{s} = 7\tev$

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

The production of \chib1P mesons in $pp$ collisions at a centre-of-mass energy of $7\tev$ is studied using $32\invpb$ of data collected with the \lhcb detector. The $\chib1P$ meson…

Measurement of the CP-violating phase phi_s in the decay Bs->J/psi phi

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

We present a measurement of the time-dependent CP-violating asymmetry in B_s -> J/psi phi decays, using data collected with the LHCb detector at the LHC. The decay time distributio…

hep-ex1998

Increased Sensitivity to Possible Muonium to Antimuonium Conversion

V. Meyer, A. Grossmann, K. Jungmann +23

A new experimental search for muonium-antimuonium conversion was conducted at the Paul Scherrer Institute, Villigen, Switzerland. The preliminary analysis yielded one event fulfill…

First observation of the decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi-

LHCb Collaboration, R. Aaij, C. Abellan Beteta +586

First observations of the Cabibbo suppressed decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi- are reported using 35 pb^{-1} of data collected with the LHCb detector. Their br…

First observation of the decay $B^0_s \rightarrow K^{0} \bar{K]^{0}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +584

The first observation of the decay $\kstarkstar$ is reported using 35\invpb of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of $4…

hep-ex2015

The Physics of the B Factories

A. J. Bevan, B. Golob, Th. Mannel +2003

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and da…

Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions

LHCb collaboration, R. Aaij, C. Abellan Beteta +605

Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is st…

Search for the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-

LHCb Collaboration, R. Aaij, C. Abellan Beteta +590

A search for the decays Bs -> mu+ mu- and B0 -> mu+ mu- is performed with 0.37 fb^-1 of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment in 2011. The upper limits…

Determination of f_s/f_d for 7 TeV pp collisions and a measurement of the branching fraction of the decay Bd->D-K+

LHCb Collaboration, R. Aaij, B. Adeva +548

The relative abundance of the three decay modes $B_{d} \to D^{-} K^{+}$ , $B_{d} \to D^{-} I ¨ ^{+}$ and $B_{s} \to D_{s}^{-} I ¨ ^{+}$ produced in 7 TeV $pp$ collisions at the LHC is determined from data…

hep-ex1998

New Bounds from Searching for Muonium to Antimuonium Conversion

L. Willmann, P. V. Schmidt, H. P. Wirtz +26

A new upper limit for the probability of spontaneous muonium to antimuonium conversion was established at $P_{M M ˉ} \leq 8.2 \cdot 1 0^{- 11}$ (90%C.L.) in 0.1~T magnetic f…

Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +620

A measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays is presented, based on 1.0fb-1 of pp collision data recorded by the LHCb experiment during 2011. The measurement is pe…

hep-ex2014

Observation of double charm production involving open charm in pp collisions at $s$ =7 TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

The production of $J / I ¨ $ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated…

Measurement of Upsilon production in pp collisions at \sqrt{s} = 7 TeV

The LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The production of Upsilon(1S), Upsilon(2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy of sqrt(s)=7 TeV is studied with the LHCb detector. The a…

First observation of the decay $B^{+} \to I ¨ ^{+} I^¼^{+} I^¼^{-}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +621

A discovery of the rare decay $B^{+} \to I ¨ ^{+} I^¼^{+} I^¼^{-}$ is presented. This decay is observed for the first time, with 5.2 $I ¨ $ significance. The observation is made…

Measurement of $b$ -hadron branching fractions for two-body decays into charmless charged hadrons

LHCb collaboration, R. Aaij, C. Abellan Beteta +589

Based on data corresponding to an integrated luminosity of 0.37 fb^-1 collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B0 -> pi…

nucl-ex1998

Results from Searching for Muonium to Antimuonium Conversion

K. Jungmann, A. Grossmann, J. Merkel +23

A new result from searching for muonium to antimuonium conversion is reported which sets an upper limit on the coupling constant in an assumed $(V - A) \times (V - A)$ type interaction…

Measurement of the time-dependent CP asymmetry in B0 -> J/Ï KS0 decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +622

This Letter reports a measurement of the CP violation observables S_J/ÏKS0 and C_J/ÏKS0 in the decay channel B0 -> J/Ï KS0 performed with 1.0/fb of pp collisions at sqrt(s) = 7…

Measurement of the $B_{s}^{0} \to J / I ¨ K^{* 0}$ branching fraction and angular amplitudes

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

A search for the decay $B_{s}^{0} \to J / I ¨ K^{* 0}$ with $K^{* 0} \to K^{-} I ¨ ^{+}$ is performed with 0.37 fb $^{- 1}$ of $pp$ collisions at $s$ = 7 TeV collected by the LH…

First observation of the decay $B_{s 2}^{} (5840)^{0} \to B^{+} K^{-}$ and studies of excited $B_{s}$ mesons

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

Properties of the orbitally excited (L=1) $B_{s}$ states are studied using 1.0 fb $^{- 1}$ of pp collisions at $s = 7$ TeV collected with the LHCb detector. The first observation…

Observation of excited Lambda_b0 baryons

LHCb collaboration, R. Aaij, C. Abellan Beteta +615

Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda_b0pi+pi- spectrum with masses 5…

First observation of the decay Bc+ to J/psi pi+pi-pi+

LHCb collaboration, R. Aaij, C. Abellan Beteta +592

The decay Bc+ --> J/psi pi+pi-pi+ is observed for the first time, using 0.8 fb-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment. The ratio of branching fraction…

Search for CP violation in $D^{+} \to K^{-} K^{+} I ¨ ^{+}$ decays

LHCb Collaboration, R. Aaij, B. Adeva +573

A model-independent search for direct CP violation in the Cabibbo suppressed decay $D^{+} \to K^{-} K^{+} I ¨ ^{+}$ in a sample of approximately 370,000 decays is carried out. The data were c…

Measurements of the branching fractions of the decays $B_{s}^{0} \to D_{s}^{\mp} K^{\pm}$ and $B_{s}^{0} \to D_{s}^{-} I ¨ ^{+}$

The LHCb collaboration, R. Aaij, C. Abellan Beteta +592

The decay mode $\B^{0}_{s} \to D^{\mp}_{s} K^{\pm} $ allows for one of the theoretically cleanest measurements of the CKM angle $I^^{3}$ through the study of time-dependent $\ensuremat…

Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

Using 34.7 pb-1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at sqrt(s) = 7 TeV is observed for the first time. Candidat…

Measurement of the CP-violating phase Ïs in Bs->J/ÏÏ+Ï- decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +592

Measurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd fi…

First evidence of direct CP violation in charmless two-body decays of Bs mesons

LHCb collaboration, R. Aaij, C. Abellan Beteta +591

Using a data sample corresponding to an integrated luminosity of 0.35 $fb^{- 1}$ collected by LHCb in 2011, we report the first evidence of CP violation in the decays of $B…

Measurement of the isospin asymmetry in $B \to K^{(*)} I^¼^{+} I^¼^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +615

The isospin asymmetries of $B \to K^{(*)} I^¼^{+} I^¼^{-}$ decays and the partial branching fractions of $B^{0} \to K^{0} I^¼^{+} I^¼^{-}$ and $B^{+} \to K^{*+} I^¼^{+} I^¼^{-}$ are measured as a function of th…

Measurement of the Bs effective lifetime in the J/psi f0(980) final state

LHCb Collaboration, R. Aaij, C. Abellan Beteta +618

The effective lifetime of the Bs meson in the decay mode Bs->J/Ïf0(980) is measured using 1.0/fb of data collected in pp collisions at sqrt(s) = 7 TeV with the LHCb detector. The…

Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +589

A study of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays is performed with data corresponding to 0.37 fb-1 of proton-proton collisions at sqrt(s)=7 TeV. Their branching fractions ar…

First observation of Bs -> J/psi f0(980) decays

The LHCb Collaboration, R. Aaij, B. Adeva +545

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate…

Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays

LHCb Collaboration, R. Aaij, C. Abellan Beteta +579

The B^0_s-\bar{B}^0_s oscillation frequency Delta m_s is measured with 36 pb^{-1} of data collected in pp collisions at \sqrt{s} = 7 TeV by the LHCb experiment at the Large Hadron…

Opposite-side flavour tagging of B mesons at the LHCb experiment

LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The calibration and performance of the opposite-side flavour tagging algorithms used for the measurements of time-dependent asymmetries at the LHCb experiment are described. The al…

Inclusive $W$ and $Z$ production in the forward region at $s = 7$ TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +606

Measurements of inclusive $W$ and $Z$ boson production cross-sections in $pp$ collisions at $s = 7$ TeV using final states containing muons are presented. The data sample corr…

hep-ex1999

Measurement of the 1s-2s energy interval in muonium

V. Meyer, S. N. Bagayev, P. E. G. Baird +26

The 1s-2s interval has been measured in the muonium ({ $I^¼^{+} e^{-}$ }) atom by Doppler-free two-photon laser spectroscopy. The frequency separation of the states was determined to be 2…

hep-ex2014

Measurements of $B_{c}^{+}$ production and mass with the $B_{c}^{+} \to J / I ¨ I ¨ ^{+}$ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

Measurements of $B_{c}^{+}$ production and mass are performed with the decay mode $B_{c}^{+} \to J / I ¨ I ¨ ^{+}$ using 0.37 fb $^{- 1}$ of data collected in $pp$ collisions at $s = 7$ TeV by…

hep-ex2010

Roadmap for selected key measurements of LHCb

The LHCb Collaboration, B. Adeva, M. Adinolfi +509

Six of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The "road map" towards the preci…

Determination of the sign of the decay width difference in the B_s system

LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The interference between the K+K- S-wave and P-wave amplitudes in B_s -> J/psi K+K- decays with the K+K- pairs in the region around the phi(1020) resonance is used to determine the…

Measurement of prompt hadron production ratios in $pp$ collisions at $s =$ 0.9 and 7 TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

The charged-particle production ratios $p ˉ / p$ , $K^{-} / K^{+}$ , $I ¨ ^{-} / I ¨ ^{+}$ , $(p + p ˉ) / (I ¨ ^{+} + I ¨ ^{-})$ , $(K^{+} + K^{-}) / (I ¨ ^{+} + I ¨ ^{-})$ and $(p + p ˉ) / (K^{+} + K^{-})$ are measured…

Measurement of the forward energy flow in pp collisions at sqrt(s)=7 TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +628

The energy flow created in pp collisions at sqrt(s)=7 TeV is studied within the pseudorapidity range 1.9<eta<4.9 with data collected by the LHCb experiment. The measurements are pe…

Measurement of b hadron production fractions in 7 TeV pp collisions

The LHCb Collaboration, R. Aaij, C. Abellan Beteta +587

Measurements of $b$ hadron production ratios in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of 3 pb $^{- 1}$ are presented. We study th…

Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +592

Using 1.0 fb^{-1} of pp collision data collected at a centre-of-mass energy of sqrt{s}=7 TeV with the LHCb detector, measurements of the polarization amplitudes, strong phase diffe…

Measurement of the B+- production cross-section in pp collisions at sqrt(s)=7 TeV

The LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The production of B+- mesons in proton-proton collisions at sqrt(s)=7 TeV is studied using 35 pb-1 of data collected by the LHCb detector. The B+- mesons are reconstructed exclusiv…

First observation of the decay $B ˉ_{s}^{0} \to D^{0} K^{* 0}$ and a measurement of the ratio of branching fractions $\frac{B ( B ˉ _{s}^{0} \to D ^{0} K ^{* 0} )}{B ( B ˉ ^{0} \to D ^{0} I ¨ ^{0} )}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +578

The first observation of the decay $B ˉ_{s}^{0} \to D^{0} K^{* 0}$ using $pp$ data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated l…

Observation of $J / I ¨ $ pair production in pp collisions at $s = 7 T e V$

LHCb Collaboration, R. Aaij, B. Adeva +567

The production of $J / I ¨ $ pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of $37.5 p b^{- 1}$ collected with the…

Measurement of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime

LHCb Collaboration, R. Aaij, C. Abellan Beteta +586

A measurement of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime is presented using approximately $37 p b^{- 1}$ of data collected by LHCb during 2010. This quantity can be used to…

Measurement of the inclusive phi cross-section in pp collisions at sqrt(s) = 7 TeV

LHCb Collaboration, R. Aaij, B. Adeva +551

The cross-section for inclusive phi meson production in pp collisions at a centre-of-mass energy of sqrt(s) = 7 TeV has been measured with the LHCb detector at the Large Hadron Col…

First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} I ¨ $

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

Evidence for the hadronic annihilation decay mode $B^{+} \to D_{s}^{+} I ¨ $ is found with greater than $3 I ¨ $ significance. The branching fraction and \CP asymmetry are measured to be \…

Evidence for CP violation in time-integrated D0 -> h-h+ decay rates

LHCb Collaboration, R. Aaij, C. Abellan Beteta +586

A search for time-integrated CP violation in D0 -> h-h+ (h=K, pi) decays is presented using 0.62 fb^-1 of data collected by LHCb in 2011. The flavor of the charm meson is determine…

hep-ex2020

Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV

LHCb collaboration, R. Aaij, C. AbellÃ¡n Beteta +577

The differential cross-section for the inclusive production of psi(2S) mesons in pp collisions at sqrt(s)=7 TeV has been measured with the LHCb detector. The data sample correspond…

First observation of Bs -> D_{s2}^{*+} X mu nu decays

LHCb Collaboration, R. Aaij, B. Adeva +586

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are d…

Measurement of the CP violating phase Ï_s in Bs->J/Ïf0(980)

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/ÏÏ has been used. Here we report on a measure…

Search for the lepton number violating decays $B^{+} \to I ¨ ^{-} I^¼^{+} I^¼^{+}$ and $B^{+} \to K^{-} I^¼^{+} I^¼^{+}$

The LHCb Collaboration, R. Aaij, C. Abellan Beteta +578

A search is performed for the lepton number violating decay $B^{+} \to h^{-} I^¼^{+} I^¼^{+}$ , where $h^{-}$ represents a $K^{-}$ or a $I ¨ ^{-}$ , using data from the LHCb detector corresponding to…

Observation of Bs -> J/Ïf'2(1525) in J/ÏK+K- final states

LHCb Collaboration, R. Aaij, C. Abellan Beteta +583

The decay Bs -> J/ÏK+ K- is investigated using 0.16/fb of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/ÏÏ channel is well known, final states…

Evidence for the decay $B^{0} \to J / I ¨ I ¨ $ and measurement of the relative branching fractions of $B_{s}^{0}$ meson decays to $J / I ¨ I^\cdot$ and $J / I ¨ I^\cdot^{^{'}}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +620

First evidence of the $B^{0} \to J / I ¨ I ¨ $ decay is found and the $B_{s}^{0} \to J / I ¨ I^\cdot$ and $B_{s}^{0} \to J / I ¨ I^\cdot^{'}$ decays are studied using a dataset corresponding to an integrated…

First observation of the decays $B ˉ_{(s)}^{0} \to D_{s}^{+} K^{-} I ¨ ^{+} I ¨ ^{-}$ and $B ˉ_{s}^{0} \to D_{s 1} (2536)^{+} I ¨ ^{-}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The first observation of the decays $B ˉ_{s}^{0} \to D_{s}^{+} K^{-} I ¨ ^{+} I ¨ ^{-}$ and $B ˉ^{0} \to D_{s}^{+} K^{-} I ¨ ^{+} I ¨ ^{-}$ are reported using an integrated luminosity of 1.0 fb $^{- 1}$ recorded by…

Measurement of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

A precise determination of the effective $B_{s}^{0} \to K^{+} K^{-}$ lifetime can be used to constrain contributions from physics beyond the Standard Model in the $B_{s}^{0}$ meson sys…

A study of the $Z$ production cross-section in $pp$ collisions at $s = 7$ TeV using tau final states

The LHCb collaboration, R. Aaij, C. Abellan Beteta +621

A measurement of the inclusive $Z \to I ¨ I ¨ $ cross-section in $pp$ collisions at $s = 7$ TeV is presented based on a dataset of 1.0 fb $^{- 1}$ collected by the LHCb detector.…

Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The first observation of the decay B0 -> D0bar K+ K- is reported from an analysis of 0.62 fb-1 of pp collision data collected with the LHCb detector. Its branching fraction is meas…

Measurement of the ratio of prompt $I ¨ _{c}$ to $J / I ¨ $ production in $pp$ collisions at $s = 7$ TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +591

The prompt production of charmonium $I ¨ _{c}$ and $J / I ¨ $ states is studied in proton-proton collisions at a centre-of-mass energy of $s = 7$ TeV at the Large Hadron Collider. T…

physics.ins-det2014

Performance of the LHCb Outer Tracker

LHCb Outer Tracker group, R. Arink, S. Bachmann +52

The LHCb Outer Tracker is a gaseous detector covering an area of 5x6 m2 with 12 double layers of straw tubes. The detector with its services are described together with the commiss…

Measurement of mixing and CP violation parameters in two-body charm decays

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

A study of mixing and indirect CP violation in D0 mesons through the determination of the parameters y_CP and A_Î is presented. The parameter y_CP is the deviation from unity of t…

Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV

LHCb Collaboration, R. Aaij, B. Adeva +543

The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/psi production…

Search for the X(4140) state in B+ to J/psi phi K+ decays

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

A search for the X(4140) state in B+ to J/psi phi K+ decays is performed with 0.37 fb-1 of pp collisions at sqrt(s)=7 TeV collected by the LHCb experiment. No evidence for this sta…

Measurement of charged particle multiplicities in $pp$ collisions at $s = 7$ TeV in the forward region

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

The charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of $s = 7$ TeV in different intervals of pseudorapid…

Differential branching fraction and angular analysis of the decay $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +585

The angular distributions and the partial branching fraction of the decay $B^{0} \to K^{* 0} I^¼^{+} I^¼^{-}$ are studied using an integrated luminosity of $0.37 f b^{- 1}$ of data…

Measurement of the cross-section ratio $I ¨ (I ¨ _{c 2}) / I ¨ (I ¨ _{c 1})$ for prompt $I ¨ _{c}$ production at $s = 7$ TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

The prompt production of the charmonium $I ¨ _{c 1}$ and $I ¨ _{c 2}$ mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of $\sqr…

Measurement of the ratio of branching fractions BR(B0 -> K0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K0 gamma

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data colle…

Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma)

LHCb Collaboration, R. Aaij, C. Abellan Beteta +594

The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 -> phi gamma has been measured using 0.37 fb-1 of pp collisions at a centre of mass energy of sqr…

Observation of CP violation in B+ to DK+ decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +589

An analysis of B+ to DK+ and B+ to Dpi+ decays is presented where the D meson is reconstructed in the two-body final states: K+pi-, K+K-, pi+pi- and pi+K-. Using 1.0 fb-1 of LHCb d…

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

The asymmetry in the production cross-section Ïof D+/- mesons, A_P = (Ï(D+) - Ï(D-))/(Ï(D+) + Ï(D-)), is measured in bins of pseudorapidity Î·and transverse momentum p_T withi…

Differential branching fraction and angular analysis of the $B^{+} \to K^{+} I^¼^{+} I^¼^{-}$ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

The angular distribution and differential branching fraction of the decay $B^{+} \to K^{+} I^¼^{+} I^¼^{-}$ are studied with a dataset corresponding to $1.0 fb^{- 1}$ …

hep-ex2010

Prompt K_short production in pp collisions at sqrt(s)=0.9 TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +627

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analys…

Measurement of $V^{0}$ production ratios in $pp$ collisions at $s = 0.9$ and 7\,TeV

LHCb Collaboration, R. Aaij, B. Adeva +547

The $I^ˉ / I^$ and $I^ˉ / K_{S}^{0}$ production ratios are measured by the LHCb detector from $0.3 nb^{- 1}$ of $pp$ collisions delivered by the LHC at $\sqrt{s…

Analysis of the resonant components in Bs->J/ÏÏ+Ï-

The LHCb collaboration, R. Aaij, C. Abellan Beteta +592

The decay Bs->J/ÏÏ+Ï- can be exploited to study CP violation. A detailed understanding of its structure is imperative in order to optimize its usefulness. An analysis of this th…

Absolute luminosity measurements with the LHCb detector at the LHC

The LHCb Collaboration, R. Aaij, B. Adeva +571

Absolute luminosity measurements are of general interest for colliding-beam experiments at storage rings. These measurements are necessary to determine the absolute cross-sections…

Measurements of the Branching fractions for $B_{(} s) - > D_{(} s) I ¨ I ¨ I ¨ $ and $I^_{b}^{0} - > I^_{c}^{+} I ¨ I ¨ I ¨ $

LHCb Collaboration, R. Aaij, B. Adeva +566

Branching fractions of the decays $H_{b} \to H_{c} I ¨ ^{-} I ¨ ^{+} I ¨ ^{-}$ relative to $H_{b} \to H_{c} I ¨ ^{-}$ are presented, where $H_{b}$ ( $H_{c}$ ) represents B^0-bar( $D^{+}$ ), $B^{-}$ ( $D^{0}$ ), B_s^0-bar ($D_s…

Study of $D_{s J}$ decays to $D^+\KS$ and $D^{0} K^{+}$ final states in $pp$ collisions

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

A study of $D^+\KS$ and $D^{0} K^{+}$ final states is performed in a sample of 1.0/fb of $pp$ collision data collected at a centre-of-mass energy of $s = 7$ TeV with the \lhcb dete…

A model-independent Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ with $D \to K_{S}^{0} h^{+} h^{-}$ ( $h = I ¨ , K$ ) decays and constraints on the CKM angle $I^^{3}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

A binned Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ decays, with $D \to K_{S}^{0} I ¨ ^{+} I ¨ ^{-}$ and $D \to K_{S}^{0} K^{+} K^{-}$ , is performed to measure the CP-violating observables…

hep-th1996

Masses of the physical mesons from an effective QCD--Hamiltonian

H. C. Pauli, J. Merkel

The front form Hamiltonian for quantum chromodynamics, reduced to an effective Hamiltonian acting only in the $q q ˉ$ space, is solved approximately. After coordinate transformat…

Measurement of the $B^{0}$ -- $B ˉ^{0}$ oscillation frequency $I^ m_{d}$ with the decays $B^{0} \to D^{-} I ¨ ^{+}$ and $B^{0} \to J / I ¨ K^{* 0}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The $B^{0}$ -- $B ˉ^{0}$ oscillation frequency $I^ m_{d}$ is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of $1.0$ fb $^{- 1}$ of proton-proto…