A search for CP violation in <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><mi>p</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></math> and <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><mi>p</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> decays is presented using a sample of pp collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0<math><mspace width="0.2em"></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math>. The CP -violating asymmetries are measured to be <math><msubsup><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow><mrow><mi>p</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msubsup><mo>=</mo><mo>−</mo><mn>0.020</mn><mo>±</mo><mn>0.013</mn><mo>±</mo><mn>0.019</mn></math> and <math><msubsup><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow><mrow><mi>p</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msubsup><mo>=</mo><mo>−</mo><mn>0.035</mn><mo>±</mo><mn>0.017</mn><mo>±</mo><mn>0.020</mn></math>, and their difference <math><msubsup><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow><mrow><mi>p</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msubsup><mo>−</mo><msubsup><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow><mrow><mi>p</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msubsup><mo>=</mo><mn>0.014</mn><mo>±</mo><mn>0.022</mn><mo>±</mo><mn>0.010</mn></math>, where the first uncertainties are statistical and the second systematic. These are the most precise measurements of such asymmetries to date.

Netherlands

R. Aaij

Spain

B. Adeva

United Kingdom

M. Adinolfi

United States

C.A. Aidala

France

Z. Ajaltouni

S. Akar

Italy

P. Albicocco

Germany

J. Albrecht

CERN

F. Alessio

M. Alexander

A. Alfonso Albero

S. Ali

Russia

G. Alkhazov

P. Alvarez Cartelle

A.A. Alves

Brazil

S. Amato

S. Amerio

Y. Amhis

China

L. An

L. Anderlini

Switzerland

G. Andreassi

M. Andreotti

J.E. Andrews

R.B. Appleby

F. Archilli

P. d'Argent

J. Arnau Romeu

A. Artamonov

M. Artuso

K. Arzymatov

E. Aslanides

M. Atzeni

B. Audurier

S. Bachmann

J.J. Back

S. Baker

V. Balagura

W. Baldini

A. Baranov

R.J. Barlow

S. Barsuk

W. Barter

F. Baryshnikov

Poland

V. Batozskaya

B. Batsukh

V. Battista

A. Bay

J. Beddow

F. Bedeschi

I. Bediaga

A. Beiter

L.J. Bel

S. Belin

N. Beliy

V. Bellee

N. Belloli

K. Belous

I. Belyaev

E. Ben-Haim

G. Bencivenni

S. Benson

S. Beranek

A. Berezhnoy

R. Bernet

D. Berninghoff

E. Bertholet

A. Bertolin

C. Betancourt

F. Betti

M.O. Bettler

M. van Beuzekom

Ia. Bezshyiko

S. Bhasin

J. Bhom

S. Bifani

P. Billoir

A. Birnkraut

A. Bizzeti

M. Bjørn

M.P. Blago

T. Blake

F. Blanc

S. Blusk

D. Bobulska

V. Bocci

O. Boente Garcia

T. Boettcher

A. Bondar

N. Bondar

S. Borghi

M. Borisyak

M. Borsato

F. Bossu

M. Boubdir

T.J.V. Bowcock

C. Bozzi

S. Braun

M. Brodski

J. Brodzicka

A. Brossa Gonzalo

Search for Violation in And Decays

The decay <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>7</mn></math> and 8 Tev, corresponding to an integrated luminosity of 3<math><msup><mrow><mtext> fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math>. The ratio of branching fractions between <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> and <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> decays is measured to be<math><mfrac><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow></mfrac><mo>=</mo><mn>0.0540</mn><mo>±</mo><mn>0.0023</mn><mo>±</mo><mn>0.0032</mn><mo>.</mo></math> Two resonant structures are observed in the <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> mass spectrum of the <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> decays, corresponding to the <math><msub><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow></msub><msup><mrow><mo>(</mo><mn>2455</mn><mo>)</mo></mrow><mrow><mn>0</mn></mrow></msup></math> and <math><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msubsup><msup><mrow><mo>(</mo><mn>2520</mn><mo>)</mo></mrow><mrow><mn>0</mn></mrow></msup></math> states. The ratios of branching fractions with respect to the decay <math><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> are<math><mtable><mtr><mtd><mfrac><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><mo>)</mo><mo>×</mo><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow></mfrac><mo>=</mo><mn>0.089</mn><mo>±</mo><mn>0.015</mn><mo>±</mo><mn>0.006</mn><mo>,</mo></mtd></mtr><mtr><mtd><mfrac><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><mo>)</mo><mo>×</mo><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow><mrow><mi>B</mi><mo>(</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>Λ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mi>p</mi><mover><mrow><mi>p</mi></mrow><mo>‾</mo></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo></mrow></mfrac><mo>=</mo><mn>0.119</mn><mo>±</mo><mn>0.020</mn><mo>±</mo><mn>0.014</mn><mo>.</mo></mtd></mtr></mtable></math> In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

G. Auriemma

E. Bowen

D. Brundu

E. Buchanan

C. Burr

A. Bursche

J. Buytaert

W. Byczynski

S. Cadeddu

H. Cai

Observation of the decay

A search for decays of <math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup></math> mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of <math><mn>3.0</mn><mspace width="0.2em"></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math>, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are <math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mi>s</mi><mo>)</mo></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mo>+</mo></mrow></msubsup><msup><mrow><mover><mrow><mi>D</mi></mrow><mo>‾</mo></mover></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mn>0</mn></mrow></msup></math> and <math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msubsup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mi>s</mi><mo>)</mo></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mo>+</mo></mrow></msubsup><msup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mn>0</mn></mrow></msup></math>, which are normalised to high-yield <math><msup><mrow><mi>B</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msubsup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mi>s</mi><mo>)</mo></mrow><mrow><mo>+</mo></mrow></msubsup><msup><mrow><mover><mrow><mi>D</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math> decays. No evidence for a signal is found and limits are set on twelve <math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup></math> decay modes.

M. Baalouch

I. Babuschkin

A. Badalov

C. Baesso

C. Barschel

L. Beaucourt

I. Bordyuzhin

Search for Decays to two Charm Mesons

The ratio of branching fractions <math><mi>R</mi><mo>(</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><mo>)</mo><mo>≡</mo><mi>B</mi><mo>(</mo><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>τ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>τ</mi></msub><mo>)</mo><mo>/</mo><mi>B</mi><mo>(</mo><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>μ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>μ</mi></msub><mo>)</mo></math> is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of <math><mn>3</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math>. For the first time, <math><mi>R</mi><mo>(</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><mo>)</mo></math> is determined using the <math><mi>τ</mi></math>-lepton decays with three charged pions in the final state. The <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>τ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>τ</mi></msub></math> yield is normalized to that of the <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><mrow><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>π</mi><mo>+</mo></msup><msup><mi>π</mi><mo>−</mo></msup><msup><mi>π</mi><mo>+</mo></msup></mrow></math> mode, providing a measurement of <math><mrow><mi>B</mi><mo>(</mo><msup><mrow><mi>B</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub><mo>)</mo><mo>/</mo><mspace></mspace><mi>B</mi><mo>(</mo><msup><mrow><mi>B</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo><mo>=</mo><mn>1.97</mn><mo>±</mo><mn>0.13</mn><mo>±</mo><mn>0.18</mn></mrow></math>, where the first uncertainty is statistical and the second systematic. The value of <math><mi>B</mi><mo>(</mo><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>τ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>τ</mi></msub><mo>)</mo><mo>=</mo><mo>(</mo><mn>1.42</mn><mo>±</mo><mn>0.094</mn><mo>±</mo><mn>0.129</mn><mo>±</mo><mn>0.054</mn><mo>)</mo><mo>%</mo></math> is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>μ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>μ</mi></msub></math> decay, a value of <math><mi>R</mi><mo>(</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><mo>)</mo><mo>=</mo><mn>0.291</mn><mo>±</mo><mn>0.019</mn><mo>±</mo><mn>0.026</mn><mo>±</mo><mn>0.013</mn></math> is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><mrow><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>μ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>μ</mi></msub></mrow></math> modes. This measurement is in agreement with the standard model prediction and with previous results.

P. d’Argent

A. Bitadze

J. Blouw

W. Bonivento

A. Borgheresi

T. Britton

Measurement of the Ratio of the <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>τ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>τ</mi></msub></math> and <math><msup><mi>B</mi><mn>0</mn></msup><mo>→</mo><msup><mi>D</mi><mrow><mo>*</mo><mo>−</mo></mrow></msup><msup><mi>μ</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>μ</mi></msub></math> Branching Fractions Using Three-Prong <math><mi>τ</mi></math>-Lepton Decays

The decay <math><mi>Z</mi><mo>→</mo><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> is reconstructed in pp collision data, corresponding to 2 fb$^{−1}$ of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>8</mn></math> TeV. The product of the Z production cross-section and the <math><mi>Z</mi><mo>→</mo><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range <math><mn>2.2</mn><mo>&lt;</mo><mi>η</mi><mo>&lt;</mo><mn>4.2</mn></math>, with transverse momenta <math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub><mo>&gt;</mo><mn>20</mn></math> GeV and dijet invariant mass in the range <math><mn>45</mn><mo>&lt;</mo><msub><mrow><mi>m</mi></mrow><mrow><mi>j</mi><mi>j</mi></mrow></msub><mo>&lt;</mo><mn>165</mn></math> GeV. From a signal yield of <math><mn>5462</mn><mo>±</mo><mn>763</mn></math> <math><mi>Z</mi><mo>→</mo><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> events, where the uncertainty is statistical, a production cross-section times branching fraction of <math><mn>332</mn><mo>±</mo><mn>46</mn><mo>±</mo><mn>59</mn></math> pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the <math><mi>Z</mi><mo>→</mo><mi>b</mi><mover><mrow><mi>b</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> production in the forward region of pp collisions.

First observation of forward Production in Collisions at

Measurements of CP observables in <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math> and <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math> decays are presented, where <math><msup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo></mrow></msup></math> indicates a neutral D or <math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math> meson that is an admixture of <math><msup><mrow><mi>D</mi></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mn>0</mn></mrow></msup></math> and <math><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mo>(</mo><mo>⁎</mo><mo>)</mo><mn>0</mn></mrow></msup></math> states. Decays of the <math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math> meson to the <math><mi>D</mi><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></math> and Dγ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the B candidate invariant mass distribution. Decays of the D meson are fully reconstructed in the <math><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>∓</mo></mrow></msup></math>, <math><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></math> and <math><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> final states. The analysis uses a sample of charged B mesons produced in pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and <math><mn>2.0</mn><msup><mrow><mtext> fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> taken at centre-of-mass energies of <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>7</mn></math>, 8 and 13 TeV, respectively. The study of <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math> and <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math> decays using a partial reconstruction method is the first of its kind, while the measurement of <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><mi>D</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math> and <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><mi>D</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup></math> decays is an update of previous LHCb measurements. The <math><msup><mrow><mi>B</mi></mrow><mrow><mo>±</mo></mrow></msup><mo>→</mo><mi>D</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>±</mo></mrow></msup></math> results are the most precise to date.

Measurement of Observables in → And → Decays

A search is presented for long-lived particles with a mass between 25 and 50 GeV/c2 and a lifetime between 2 and 500 ps, using protonâproton collision data corresponding to an integrated luminosity of 2.0 fb-1 , collected by the LHCbÂ detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 GeV/c2 Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle.

M. Baszczyk

T. Bird

M. Britsch

Updated search for long-lived particles decaying to jet pairs

The B0 , Bs0 , B+ and Îb0 hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 Â fbâ1 , collected by the LHCb experiment in protonâproton collisions at centre-of-mass energies of 7 and 8 Â TeV . The measurements are performed as a function of transverse momentum and rapidity of the b hadrons within the LHCb detector acceptance. The overall production asymmetries, integrated over transverse momentum and rapidity, are also determined.

Measurement of B 0 , Bs0 , B + and Λb0 production asymmetries in 7 and 8 TeV proton–proton collisions

The production of J/Ï mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair sNN=8.16Â TeV with the LHCb detector at the LHC. The double differential cross-sections of prompt and nonprompt J/Ï production are measured as a function of the J/Ï transverse momentum and rapidity in the nucleonânucleon centre-of-mass frame. Forward-to-backward ratios and nuclear modification factors are determined. The results are compared with theoretical calculations based on collinear factorisation using nuclear parton distribution functions, on the colour glass condensate or on coherent energy loss models.

M.B. Bjoern

Ukraine

M. Borysova

Prompt and nonprompt J / Ï production and nuclear modification in p Pb collisions at sNN=8.16Â TeV

Using decays to Ï -meson pairs, the inclusive production of charmonium states in b -hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0fb-1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8Â TeV. Denoting by BCâ¡B(bâCX)ÃB(CâÏÏ) the inclusive branching fraction of a b hadron to a charmonium state C that decays into a pair of Ï mesons, ratios RC2C1â¡BC1/BC2 are determined as RÎ·c(1S)Ïc0=0.147Â±0.023Â±0.011 , RÎ·c(1S)Ïc1=0.073Â±0.016Â±0.006 , RÎ·c(1S)Ïc2=0.081Â±0.013Â±0.005 , RÏc0Ïc1=0.50Â±0.11Â±0.01 , RÏc0Ïc2=0.56Â±0.10Â±0.01 and RÎ·c(1S)Î·c(2S)=0.040Â±0.011Â±0.004 . Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X (3872), X (3915) and Ïc2(2P) states are obtained as RÏc1X(3872)&lt;0.34 , RÏc0X(3915)&lt;0.12 and RÏc2Ïc2(2P)&lt;0.16 . Differential cross-sections as a function of transverse momentum are measured for the Î·c(1S) and Ïc states. The branching fraction of the decay Bs0âÏÏÏ is measured for the first time, B(Bs0âÏÏÏ)=(2.15Â±0.54Â±0.28Â±0.21B)Ã10-6 . Here the third uncertainty is due to the branching fraction of the decay Bs0âÏÏ , which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse Ï polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the Î·c(1S) decays to ÏÏ and ppÂ¯ as B(Î·c(1S)âÏÏ)/B(Î·c(1S)âppÂ¯)=1.79Â±0.14Â±0.32 .

Study of charmonium production in b -hadron decays and first evidence for the decay Bs0→ϕϕϕ