The Upgrade I of LHCb VELO -- towards an intelligent monitoring platform

The Large Hadron Collider beauty (LHCb) detector is designed to detect decays of b- and c- hadrons for the study of CP violation and rare decays. At the end of the LHC Run 2, many of the LHCb measurements remained statistically dominated. In order to increase the trigger yield for purely hadronic channels, the hardware trigger will be removed, and the detector will be read out at 40 MHz. This, in combination with the five-fold increase in luminosity, requires radical changes to LHCb's electronics, and, in some cases, the replacement of entire sub-detectors with state-of-the-art detector technologies. The Vertex Locator (VELO) surrounding the interaction region is used to reconstruct the collision points (primary vertices) and decay vertices of long-lived particles (secondary vertices). The upgraded VELO will be composed of 52 modules placed along the beam axis divided into two retractable halves. The modules will each be equipped with 4 silicon hybrid pixel tiles, each read out by 3 VeloPix ASICs. The total output data rate anticipated for the whole detector will be around 1.6 Tbit/s. The highest occupancy ASICs will have pixel hit rates of approximately 900 Mhit/s, with the corresponding output data rate of 15 Gbit/s. The LHCb upgrade detector will be the first detector to read out at the full LHC rate of 40 MHz. The VELO upgrade will utilize the latest detector technologies to read out at this rate while maintaining the required radiation-hard profile and minimizing the detector material

Study of the lineshape of the chi(c1) (3872) state

A study of the lineshape of the chi(c1) (3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb(-1) collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate chi(c1)(3872) and psi(2S) mesons from b-hadron decays are selected in the J/psi pi(+)pi(-) decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the chi(c1 )(3872) and psi(2S) states, Delta m, and the width of the chi(c1 )(3872) state, Gamma(Bw), are determined to be (Delta m=185.598 +/- 0.067 +/- 0.068 Mev,)(Gamma BW=1.39 +/- 0.24 +/- 0.10 Mev,) where the first uncertainty is statistical and the second systematic. Using a Flatte-inspired model, the mode and full width at half maximum of the lineshape are determined to be (mode=3871.69+0.00+0.05 MeV.)(FWHM=0.22-0.04+0.13+0.07+0.11-0.06-0.13 MeV, ) An investigation of the analytic structure of the Flatte amplitude reveals a pole structure, which is compatible with a quasibound D-0(D) over bar*(0) state but a quasivirtual state is still allowed at the level of 2 standard deviations

Measurement of the CKM angle γγ in B±→DK±B^\pm\to D K^\pm and B±→Dπ±B^\pm \to D π^\pm decays with D→KS0h+h−D \to K_\mathrm S^0 h^+ h^-

A measurement of $CP$-violating observables is performed using the decays $B^\pm\to D K^\pm$ and $B^\pm\to D \pi^\pm$, where the $D$ meson is reconstructed in one of the self-conjugate three-body final states $K_{\mathrm S}\pi^+\pi^-$ and $K_{\mathrm S}K^+K^-$ (commonly denoted $K_{\mathrm S} h^+h^-$). The decays are analysed in bins of the $D$-decay phase space, leading to a measurement that is independent of the modelling of the $D$-decay amplitude. The observables are interpreted in terms of the CKM angle $\gamma$. Using a data sample corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ collected in proton-proton collisions at centre-of-mass energies of $7$, $8$, and $13\,\text{TeV}$ with the LHCb experiment, $\gamma$ is measured to be $\left(68.7^{+5.2}_{-5.1}\right)^\circ$. The hadronic parameters $r_B^{DK}$, $r_B^{D\pi}$, $\delta_B^{DK}$, and $\delta_B^{D\pi}$, which are the ratios and strong-phase differences of the suppressed and favoured $B^\pm$ decays, are also reported

Measurement of CP asymmetries and branching fraction ratios of B− decays to two charm mesons

The $CP$ asymmetries of seven $B^-$ decays to two charm mesons are measured using data corresponding to an integrated luminosity of $9\text{fb}^{-1}$ of proton-proton collisions collected by the LHCb experiment. Decays involving a $D^{*0}$ or $D^{*-}_s$ meson are analysed by reconstructing only the $D^0$ or $D^-_s$ decay products. This paper presents the first measurement of $\mathcal{A}^{CP}(B^- \rightarrow D^{*-}_s D^0)$ and $\mathcal{A}^{CP}(B^- \rightarrow D^{-}_s D^{*0})$, and the most precise measurement of the other five $CP$ asymmetries. There is no evidence of $CP$ violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.The CP asymmetries of seven B$^{−}$ decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb$^{−1}$ of proton-proton collisions collected by the LHCb experiment. Decays involving a D$^{*0}$ or ${D}_s^{\ast -}$ meson are analysed by reconstructing only the D$^{0}$ or ${D}_s^{-}$ decay products. This paper presents the first measurement of $\mathcal{A} ^{CP}$(B$^{−}$→${D}_s^{\ast -}$D$^{0}$) and $\mathcal{A} ^{CP}$(B$^{−}$→${D}_s^{-}$D$^{∗0}$), and the most precise measurement of the other five CP asymmetries. There is no evidence of CP violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.[graphic not available: see fulltext]The $CP$ asymmetries of seven $B^-$ decays to two charm mesons are measured using data corresponding to an integrated luminosity of $9\text{ fb}^{-1}$ of proton-proton collisions collected by the LHCb experiment. Decays involving a $D^{*0}$ or $D^{*-}_s$ meson are analysed by reconstructing only the $D^0$ or $D^-_s$ decay products. This paper presents the first measurement of $\mathcal{A}^{CP}(B^- \rightarrow D^{*-}_s D^0)$ and $\mathcal{A}^{CP}(B^- \rightarrow D^{-}_s D^{*0})$, and the most precise measurement of the other five $CP$ asymmetries. There is no evidence of $CP$ violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured

Study of the doubly charmed tetraquark T+cc

Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T+cc tetraquark with a quark content of ccu⎯⎯⎯d⎯⎯⎯ and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector T+cc state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T+cc state. In addition, an unexpected dependence of the production rate on track multiplicity is observed

Measurement of psi (2S) production cross-sections in proton-proton collisions at v s=7 and 13 TeV

The cross-sections of \u3c8(2 S) meson production in proton-proton collisions at s=13TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275pb-1. The production cross-sections for prompt \u3c8(2 S) mesons and those for \u3c8(2 S) mesons from b-hadron decays (\u3c8(2S)-from-b) are determined as functions of the transverse momentum, pT, and the rapidity, y, of the \u3c8(2 S) meson in the kinematic range 2<20GeV/c and 2.0 < y< 4.5. The production cross-sections integrated over this kinematic region are \u3c3(prompt\u3c8(2S),13TeV)=1.430\ub10.005(stat)\ub10.099(syst)\u3bcb,\u3c3(\u3c8(2S)-from-b,13TeV)=0.426\ub10.002(stat)\ub10.030(syst)\u3bcb.A new measurement of \u3c8(2 S) production cross-sections in pp collisions at s=7TeV is also performed using data collected in 2011, corresponding to an integrated luminosity of 614pb-1. The integrated production cross-sections in the kinematic range 3.5<14GeV/c and 2.0 < y< 4.5 are \u3c3(prompt\u3c8(2S),7TeV)=0.471\ub10.001(stat)\ub10.025(syst)\u3bcb,\u3c3(\u3c8(2S)-from-b,7TeV)=0.126\ub10.001(stat)\ub10.008(syst)\u3bcb.All results show reasonable agreement with theoretical calculations

Measurement of the branching fraction and CP asymmetry in B plus . J/.. plus decays

none845noneAaij R.; Beteta C.A.; Adeva B.; Adinolfi M.; Aidala C.A.; Ajaltouni Z.; Akar S.; Albicocco P.; Albrecht J.; Alessio F.; Alexander M.; Albero A.A.; Alkhazov G.; Alvarez Cartelle P.; Alves A.A.; Amato S.; Amerio S.; Amhis Y.; An L.; Anderlini L.; Andreassi G.; Andreotti M.; Andrews J.E.; Archilli F.; d'Argent P.; Arnau Romeu J.; Artamonov A.; Artuso M.; Arzymatov K.; Aslanides E.; Atzeni M.; Audurier B.; Bachmann S.; Back J.J.; Baker S.; Balagura V.; Baldini W.; Baranov A.; Barlow R.J.; Barrand G.C.; Barsuk S.; Barter W.; Bartolini M.; Baryshnikov F.; Batozskaya V.; Batsukh B.; Battig A.; Battista V.; Bay A.; Beddow J.; Bedeschi F.; Bediaga I.; Beiter A.; Bel L.J.; Belin S.; Beliy N.; Bellee V.; Belloli N.; Belous K.; Belyaev I.; Ben-Haim E.; Bencivenni G.; Benson S.; Beranek S.; Berezhnoy A.; Bernet R.; Berninghoff D.; Bertholet E.; Bertolin A.; Betancourt C.; Betti F.; Bettler M.O.; van Beuzekom M.; Bezshyiko I.; Bhasin S.; Bhom J.; Bifani S.; Billoir P.; Birnkraut A.; Bizzeti A.; Bjorn M.; Blago M.P.; Blake T.; Blanc F.; Blusk S.; Bobulska D.; Bocci V.; Garcia O.B.; Boettcher T.; Bondar A.; Bondar N.; Borghi S.; Borisyak M.; Borsato M.; Bossu F.; Boubdir M.; Bowcock T.J.V.; Bozzi C.; Braun S.; Brodski M.; Brodzicka J.; Gonzalo A.B.; Brundu D.; Buchanan E.; Buonaura A.; Burr C.; Bursche A.; Buytaert J.; Byczynski W.; Cadeddu S.; Cai H.; Calabrese R.; Calladine R.; Calvi M.; Calvo Gomez M.; Camboni A.; Campana P.; Campora Perez D.H.; Capriotti L.; Carbone A.; Carboni G.; Cardinale R.; Cardini A.; Carniti P.; Carson L.; Carvalho Akiba K.; Casse G.; Cassina L.; Cattaneo M.; Cavallero G.; Cenci R.; Chamont D.; Chapman M.G.; Charles M.; Charpentier P.; Chatzikonstantinidis G.; Chefdeville M.; Chekalina V.; Chen C.; Chen S.; Chitic S.-G.; Chobanova V.; Chrzaszcz M.; Chubykin A.; Ciambrone P.; Cid Vidal X.; Ciezarek G.; Clarke P.E.L.; Clemencic M.; Cliff H.V.; Closier J.; Coco V.; Coelho J.A.B.; Cogan J.; Cogneras E.; Cojocariu L.; Collins P.; Colombo T.; Comerma-Montells A.; Contu A.; Coombs G.; Coquereau S.; Corti G.; Corvo M.; Costa Sobral C.M.; Couturier B.; Cowan G.A.; Craik D.C.; Crocombe A.; Cruz Torres M.; Currie R.; D'Ambrosio C.; Da Cunha Marinho F.; Da Silva C.L.; Dall'Occo E.; Dalseno J.; Danilina A.; Davis A.; De Aguiar Francisco O.; De Bruyn K.; De Capua S.; De Cian M.; De Miranda J.M.; De Paula L.; De Serio M.; De Simone P.; Dean C.T.; Decamp D.; Del Buono L.; Delaney B.; Dembinski H.-P.; Demmer M.; Dendek A.; Derkach D.; Deschamps O.; Desse F.; Dettori F.; Dey B.; Di Canto A.; Di Nezza P.; Didenko S.; Dijkstra H.; Dordei F.; Dorigo M.; Dosil Suarez A.; Douglas L.; Dovbnya A.; Dreimanis K.; Dufour L.; Dujany G.; Durante P.; Durham J.M.; Dutta D.; Dzhelyadin R.; Dziewiecki M.; Dziurda A.; Dzyuba A.; Easo S.; Egede U.; Egorychev V.; Eidelman S.; Eisenhardt S.; Eitschberger U.; Ekelhof R.; Eklund L.; Ely S.; Ene A.; Escher S.; Esen S.; Evans T.; Falabella A.; Farley N.; Farry S.; Fazzini D.; Federici L.; Fernandez Declara P.; Fernandez Prieto A.; Ferrari F.; Lopes L.F.; Ferreira Rodrigues F.; Ferro-Luzzi M.; Filippov S.; Fini R.A.; Fiorini M.; Firlej M.; Fitzpatrick C.; Fiutowski T.; Fleuret F.; Fontana M.; Fontanelli F.; Forty R.; Franco Lima V.; Frank M.; Frei C.; Fu J.; Funk W.; Farber C.; Carvalho M.F.P.R.; Gabriel E.; Gallas Torreira A.; Galli D.; Gallorini S.; Gambetta S.; Gan Y.; Gandelman M.; Gandini P.; Gao Y.; Garcia Martin L.M.; Plana B.G.; Garcia Pardinas J.; Garra Tico J.; Garrido L.; Gascon D.; Gaspar C.; Gavardi L.; Gazzoni G.; Gerick D.; Gersabeck E.; Gersabeck M.; Gershon T.; Gerstel D.; Ghez P.; Gibson V.; Girard O.G.; Gironell P.G.; Giubega L.; Gizdov K.; Gligorov V.V.; Golubkov D.; Golutvin A.; Gomes A.; Gorelov I.V.; Gotti C.; Govorkova E.; Grabowski J.P.; Graciani Diaz R.; Granado Cardoso L.A.; Grauges E.; Graverini E.; Graziani G.; Grecu A.; Greim R.; Griffith P.; Grillo L.; Gruber L.; Gruberg Cazon B.R.; Grunberg O.; Gu C.; Gushchin E.; Guth A.; Guz Y.; Gys T.; Gobel C.; Hadavizadeh T.; Hadjivasiliou C.; Haefeli G.; Haen C.; Haines S.C.; Hamilton B.; Han X.; Hancock T.H.; Hansmann-Menzemer S.; Harnew N.; Harnew S.T.; Harrison T.; Hasse C.; Hatch M.; He J.; Hecker M.; Heinicke K.; Heister A.; Hennessy K.; Henry L.; van Herwijnen E.; Heuel J.; Hess M.; Hicheur A.; Charman R.H.; Hill D.; Hilton M.; Hopchev P.H.; Hu J.; Hu W.; Huang W.; Huard Z.C.; Hulsbergen W.; Humair T.; Hushchyn M.; Hutchcroft D.; Hynds D.; Ibis P.; Idzik M.; Ilten P.; Ivshin K.; Jacobsson R.; Jalocha J.; Jans E.; Jawahery A.; Jiang F.; John M.; Johnson D.; Jones C.R.; Joram C.; Jost B.; Jurik N.; Kandybei S.; Karacson M.; Kariuki J.M.; Karodia S.; Kazeev N.; Kecke M.; Keizer F.; Kelsey M.; Kenzie M.; Ketel T.; Khairullin E.; Khanji B.; Khurewathanakul C.; Kim K.E.; Kirn T.; Klaver S.; Klimaszewski K.; Klimkovich T.; Koliiev S.; Kolpin M.; Kopecna R.; Koppenburg P.; Kostiuk I.; Kotriakhova S.; Kozeiha M.; Kravchuk L.; Kreps M.; Kress F.; Krokovny P.; Krupa W.; Krzemien W.; Kucewicz W.; Kucharczyk M.; Kudryavtsev V.; Kuonen A.K.; Kvaratskheliya T.; Lacarrere D.; Lafferty G.; Lai A.; Lancierini D.; Lanfranchi G.; Langenbruch C.; Latham T.; Lazzeroni C.; Le Gac R.; Leflat A.; Lefrancois J.; Lefevre R.; Lemaitre F.; Leroy O.; Lesiak T.; Leverington B.; Li P.-R.; Li Y.; Li Z.; Liang X.; Likhomanenko T.; Lindner R.; Lionetto F.; Lisovskyi V.; Liu G.; Liu X.; Loh D.; Loi A.; Longstaff I.; Lopes J.H.; Lovell G.H.; Lucchesi D.; Lucio Martinez M.; Lupato A.; Luppi E.; Lupton O.; Lusiani A.; Lyu X.; Machefert F.; Maciuc F.; Macko V.; Mackowiak P.; Maddrell-Mander S.; Maev O.; Maguire K.; Maisuzenko D.; Majewski M.W.; Malde S.; Malecki B.; Malinin A.; Maltsev T.; Manca G.; Mancinelli G.; Marangotto D.; Maratas J.; Marchand J.F.; Marconi U.; Marin Benito C.; Marinangeli M.; Marino P.; Marks J.; Marshall P.J.; Martellotti G.; Martin M.; Martinelli M.; Martinez Santos D.; Martinez Vidal F.; Massafferri A.; Materok M.; Matev R.; Mathad A.; Mathe Z.; Matteuzzi C.; Mauri A.; Maurice E.; Maurin B.; Mazurov A.; McCann M.; McNab A.; McNulty R.; Mead J.V.; Meadows B.; Meaux C.; Meinert N.; Melnychuk D.; Merk M.; Merli A.; Michielin E.; Milanes D.A.; Millard E.; Minard M.-N.; Minzoni L.; Mitzel D.S.; Mogini A.; Moise R.D.; Mombacher T.; Monroy I.A.; Monteil S.; Morandin M.; Morello G.; Morello M.J.; Morgunova O.; Moron J.; Morris A.B.; Mountain R.; Muheim F.; Mulder M.; Murphy C.H.; Murray D.; Modden A.; Muller D.; Muller J.; Muller K.; Muller V.; Naik P.; Nakada T.; Nandakumar R.; Nandi A.; Nanut T.; Nasteva I.; Needham M.; Neri N.; Neubert S.; Neufeld N.; Neuner M.; Newcombe R.; Nguyen T.D.; Nguyen-Mau C.; Nieswand S.; Niet R.; Nikitin N.; Nogay A.; Nolte N.S.; O'Hanlon D.P.; Oblakowska-Mucha A.; Obraztsov V.; Ogilvy S.; Oldeman R.; Onderwater C.J.G.; Ossowska A.; Otalora Goicochea J.M.; Ovsiannikova T.; Owen P.; Oyanguren A.; Pais P.R.; Pajero T.; Palano A.; Palutan M.; Panshin G.; Papanestis A.; Pappagallo M.; Pappalardo L.L.; Parker W.; Parkes C.; Passaleva G.; Pastore A.; Patel M.; Patrignani C.; Pearce A.; Pellegrino A.; Penso G.; Pepe Altarelli M.; Perazzini S.; Pereima D.; Perret P.; Pescatore L.; Petridis K.; Petrolini A.; Petrov A.; Petrucci S.; Petruzzo M.; Pietrzyk B.; Pietrzyk G.; Pikies M.; Pili M.; Pinci D.; Pinzino J.; Pisani F.; Piucci A.; Placinta V.; Playfer S.; Plews J.; Plo Casasus M.; Polci F.; Poli Lener M.; Poluektov A.; Polukhina N.; Polyakov I.; Polycarpo E.; Pomery G.J.; Ponce S.; Popov A.; Popov D.; Poslavskii S.; Potterat C.; Price E.; Prisciandaro J.; Prouve C.; Pugatch V.; Puig Navarro A.; Pullen H.; Punzi G.; Qian W.; Qin J.; Quagliani R.; Quintana B.; Rachwal B.; Rademacker J.H.; Rama M.; Ramos Pernas M.; Rangel M.S.; Ratnikov F.; Raven G.; Salzgeber M.R.; Reboud M.; Redi F.; Reichert S.; dos Reis A.C.; Reiss F.; Remon Alepuz C.; Ren Z.; Renaudin V.; Ricciardi S.; Richards S.; Rinnert K.; Robbe P.; Robert A.; Rodrigues A.B.; Rodrigues E.; Rodriguez Lopez J.A.; Roehrken M.; Roiser S.; Rollings A.; Romanovskiy V.; Romero Vidal A.; Rotondo M.; Rudolph M.S.; Ruf T.; Ruiz Vidal J.; Saborido Silva J.J.; Sagidova N.; Saitta B.; Salustino Guimaraes V.; Sanchez Gras C.; Sanchez Mayordomo C.; Sanmartin Sedes B.; Santacesaria R.; Santamarina Rios C.; Santimaria M.; Santovetti E.; Sarpis G.; Sarti A.; Satriano C.; Satta A.; Saur M.; Savrina D.; Schael S.; Schellenberg M.; Schiller M.; Schindler H.; Schmelling M.; Schmelzer T.; Schmidt B.; Schneider O.; Schopper A.; Schreiner H.F.; Schubiger M.; Schune M.H.; Schwemmer R.; Sciascia B.; Sciubba A.; Semennikov A.; Sepulveda E.S.; Sergi A.; Serra N.; Serrano J.; Sestini L.; Seuthe A.; Seyfert P.; Shapkin M.; Shcheglov Y.; Shears T.; Shekhtman L.; Shevchenko V.; Shmanin E.; Siddi B.G.; Silva Coutinho R.; Silva de Oliveira L.; Simi G.; Simone S.; Skiba I.; Skidmore N.; Skwarnicki T.; Slater M.W.; Smeaton J.G.; Smith E.; Smith I.T.; Smith M.; Soares M.; Soares Lavra L.; Sokoloff M.D.; Soler F.J.P.; Souza De Paula B.; Spaan B.; Spadaro Norella E.; Spradlin P.; Stagni F.; Stahl M.; Stahl S.; Stefko P.; Stefkova S.; Steinkamp O.; Stemmle S.; Stenyakin O.; Stepanova M.; Stevens H.; Stocchi A.; Stone S.; Storaci B.; Stracka S.; Stramaglia M.E.; Straticiuc M.; Straumann U.; Strokov S.; Sun J.; Sun L.; Swientek K.; Szabelski A.; Szumlak T.; Szymanski M.; T'Jampens S.; Tang Z.; Tayduganov A.; Tekampe T.; Tellarini G.; Teubert F.; Thomas E.; van Tilburg J.; Tilley M.J.; Tisserand V.; Tobin M.; Tolk S.; Tomassetti L.; Tonelli D.; Tou D.Y.; Tourinho Jadallah Aoude R.; Tournefier E.; Traill M.; Tran M.T.; Trisovic A.; Tsaregorodtsev A.; Tuci G.; Tully A.; Tuning N.; Ukleja A.; Usachov A.; Ustyuzhanin A.; Uwer U.; Vagner A.; Vagnoni V.; Valassi A.; Valat S.; Valenti G.; Vazquez Gomez R.; Vazquez Regueiro P.; Vecchi S.; van Veghel M.; Velthuis J.J.; Veltri M.; Veneziano G.; Venkateswaran A.; Vernet M.; Veronesi M.; Veronika N.V.; Vesterinen M.; Viana Barbosa J.V.; Vieira D.; Vieites Diaz M.; Viemann H.; Vilasis-Cardona X.; Vitkovskiy A.; Vitti M.; Volkov V.; Vollhardt A.; Vom Bruch D.; Voneki B.; Vorobyev A.; Vorobyev V.; de Vries J.A.; Vazquez Sierra C.; Waldi R.; Walsh J.; Wang J.; Wang M.; Wang Y.; Wang Z.; Ward D.R.; Wark H.M.; Watson N.K.; Websdale D.; Weiden A.; Weisser C.; Whitehead M.; Wicht J.; Wilkinson G.; Wilkinson M.; Williams I.; Williams M.R.J.; Williams M.; Williams T.; Wilson F.F.; Winn M.; Wislicki W.; Witek M.; Wormser G.; Wotton S.A.; Wyllie K.; Xiao D.; Xie Y.; Xu A.; Xu M.; Xu Q.; Xu Z.; Xu Z.; Yang Z.; Yang Z.; Yao Y.; Yeomans L.E.; Yin H.; Yu J.; Yuan X.; Yushchenko O.; Zarebski K.A.; Zavertyaev M.; Zhang D.; Zhang L.; Zhang W.C.; Zhang Y.; Zhelezov A.; Zheng Y.; Zhu X.; Zhukov V.; Zonneveld J.B.; Zucchelli S.Aaij, R.; Beteta, C. A.; Adeva, B.; Adinolfi, M.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Albero, A. A.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Archilli, F.; D'Argent, P.; Arnau Romeu, J.; Artamonov, A.; Artuso, M.; Arzymatov, K.; Aslanides, E.; Atzeni, M.; Audurier, B.; Bachmann, S.; Back, J. J.; Baker, S.; Balagura, V.; Baldini, W.; Baranov, A.; Barlow, R. J.; Barrand, G. C.; Barsuk, S.; Barter, W.; Bartolini, M.; Baryshnikov, F.; Batozskaya, V.; Batsukh, B.; Battig, A.; Battista, V.; Bay, A.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Beiter, A.; Bel, L. J.; Belin, S.; Beliy, N.; Bellee, V.; Belloli, N.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Beranek, S.; Berezhnoy, A.; Bernet, R.; Berninghoff, D.; Bertholet, E.; Bertolin, A.; Betancourt, C.; Betti, F.; Bettler, M. O.; van Beuzekom, M.; Bezshyiko, I.; Bhasin, S.; Bhom, J.; Bifani, S.; Billoir, P.; Birnkraut, A.; Bizzeti, A.; Bjorn, M.; Blago, M. P.; Blake, T.; Blanc, F.; Blusk, S.; Bobulska, D.; Bocci, V.; Garcia, O. B.; Boettcher, T.; Bondar, A.; Bondar, N.; Borghi, S.; Borisyak, M.; Borsato, M.; Bossu, F.; Boubdir, M.; Bowcock, T. J. V.; Bozzi, C.; Braun, S.; Brodski, M.; Brodzicka, J.; Gonzalo, A. B.; Brundu, D.; Buchanan, E.; Buonaura, A.; Burr, C.; Bursche, A.; Buytaert, J.; Byczynski, W.; Cadeddu, S.; Cai, H.; Calabrese, R.; Calladine, R.; Calvi, M.; Calvo Gomez, M.; Camboni, A.; Campana, P.; Campora Perez, D. H.; Capriotti, L.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carniti, P.; Carson, L.; Carvalho Akiba, K.; Casse, G.; Cassina, L.; Cattaneo, M.; Cavallero, G.; Cenci, R.; Chamont, D.; Chapman, M. G.; Charles, M.; Charpentier, P.; Chatzikonstantinidis, G.; Chefdeville, M.; Chekalina, V.; Chen, C.; Chen, S.; Chitic, S. -G.; Chobanova, V.; Chrzaszcz, M.; Chubykin, A.; Ciambrone, P.; Cid Vidal, X.; Ciezarek, G.; Clarke, P. E. L.; Clemencic, M.; Cliff, H. V.; Closier, J.; Coco, V.; Coelho, J. A. B.; Cogan, J.; Cogneras, E.; Cojocariu, L.; Collins, P.; Colombo, T.; Comerma-Montells, A.; Contu, A.; Coombs, G.; Coquereau, S.; Corti, G.; Corvo, M.; Costa Sobral, C. M.; Couturier, B.; Cowan, G. A.; Craik, D. C.; Crocombe, A.; Cruz Torres, M.; Currie, R.; D'Ambrosio, C.; Da Cunha Marinho, F.; Da Silva, C. L.; Dall'Occo, E.; Dalseno, J.; Danilina, A.; Davis, A.; De Aguiar Francisco, O.; De Bruyn, K.; De Capua, S.; De Cian, M.; De Miranda, J. M.; De Paula, L.; De Serio, M.; De Simone, P.; Dean, C. T.; Decamp, D.; Del Buono, L.; Delaney, B.; Dembinski, H. -P.; Demmer, M.; Dendek, A.; Derkach, D.; Deschamps, O.; Desse, F.; Dettori, F.; Dey, B.; Di Canto, A.; Di Nezza, P.; Didenko, S.; Dijkstra, H.; Dordei, F.; Dorigo, M.; Dosil Suarez, A.; Douglas, L.; Dovbnya, A.; Dreimanis, K.; Dufour, L.; Dujany, G.; Durante, P.; Durham, J. M.; Dutta, D.; Dzhelyadin, R.; Dziewiecki, M.; Dziurda, A.; Dzyuba, A.; Easo, S.; Egede, U.; Egorychev, V.; Eidelman, S.; Eisenhardt, S.; Eitschberger, U.; Ekelhof, R.; Eklund, L.; Ely, S.; Ene, A.; Escher, S.; Esen, S.; Evans, T.; Falabella, A.; Farley, N.; Farry, S.; Fazzini, D.; Federici, L.; Fernandez Declara, P.; Fernandez Prieto, A.; Ferrari, F.; Lopes, L. F.; Ferreira Rodrigues, F.; Ferro-Luzzi, M.; Filippov, S.; Fini, R. A.; Fiorini, M.; Firlej, M.; Fitzpatrick, C.; Fiutowski, T.; Fleuret, F.; Fontana, M.; Fontanelli, F.; Forty, R.; Franco Lima, V.; Frank, M.; Frei, C.; Fu, J.; Funk, W.; Farber, C.; Carvalho, M. F. P. 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Measurement of the eta(c)(1S) production cross-section in p p collisions at root s=13TeV

Using a data sample corresponding to an integrated luminosity of 2.0 fb-1, collected by the LHCb experiment, the production of the \u3b7c(1 S) state in proton\u2013proton collisions at a centre-of-mass energy of s=13TeV is studied in the rapidity range 2.0 < y< 4.5 and in the transverse momentum range 6.5<14.0GeV. The cross-section for prompt production of \u3b7c(1 S) mesons relative to that of the J/ \u3c8 meson is measured using the pp\uaf decay mode and is found to be \u3c3\u3b7c(1S)/\u3c3J/\u3c8=1.69\ub10.15\ub10.10\ub10.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/\u3c8\u2192pp\uaf and \u3b7c\u2192pp\uaf decays. The prompt \u3b7c(1 S) production cross-section is determined to be \u3c3\u3b7c(1S)=1.26\ub10.11\ub10.08\ub10.14\u3bcb, where the last uncertainty includes that on the J/ \u3c8 meson cross-section. The ratio of the branching fractions of b-hadron decays to the \u3b7c(1 S) and J/ \u3c8 states is measured to be Bb\u2192\u3b7cX/Bb\u2192J/\u3c8X=0.48\ub10.03\ub10.03\ub10.05, where the last uncertainty is due to those on the branching fractions of the J/\u3c8\u2192pp\uaf and \u3b7c\u2192pp\uaf decays. The difference between the J/ \u3c8 and \u3b7c(1 S) masses is also determined to be 113.0\ub10.7\ub10.1MeV, which is the most precise single measurement of this quantity to date

Measurement of CP asymmetries in two-body B-(s)(0)-meson decays to charged pions and kaons

The time-dependent CP asymmetries in B0\u2192\u3c0+\u3c0- and Bs0\u2192K+K- decays are measured using a data sample of p p collisions corresponding to an integrated luminosity of 3.0 fb-1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. The same data sample is used to measure the time-integrated CP asymmetries in B0\u2192K+\u3c0- and Bs0\u2192\u3c0+K- decays. The results are C\u3c0+\u3c0-=-0.34\ub10.06\ub10.01, S\u3c0+\u3c0-=-0.63\ub10.05\ub10.01, CK+K-=0.20\ub10.06\ub10.02, SK+K-=0.18\ub10.06\ub10.02, AK+K-\u394\u393=-0.79\ub10.07\ub10.10, ACPB0=-0.084\ub10.004\ub10.003, and ACPBs0=0.213\ub10.015\ub10.007, where the first uncertainties are statistical and the second systematic. Evidence for CP violation is found in the Bs0\u2192K+K- decay for the first time