Guy Wilkinson: Publications

First observation of Bs⁰→J/Ψf0(980) decays

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 698:2 (2011) 115-122

Authors:

R Aaij, B Adeva, M Adinolfi, C Adrover, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, J Amoraal, J Anderson, RB Appleby, O Aquines Gutierrez, L Arrabito, M Artuso, E Aslanides, G Auriemma, S Bachmann, DS Bailey, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, A Bates, C Bauer, T Bauer, A Bay, I Bediaga, K Belous, I Belyaev, E Ben-Haim, M Benayoun, G Bencivenni, R Bernet, MO Bettler, M van Beuzekom, S Bifani, A Bizzeti, PM Bjørnstad, T Blake, F Blanc, C Blanks, J Blouw, S Blusk, A Bobrov, V Bocci, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, E Bos, TJV Bowcock, C Bozzi, T Brambach, J van den Brand, J Bressieux, S Brisbane, M Britsch, T Britton, NH Brook, H Brown, A Büchler-Germann, A Bursche, J Buytaert, S Cadeddu, JM Caicedo Carvajal, O Callot, M Calvi, M Calvo Gomez, A Camboni, L Camilleri, P Campana, G Capon, A Carbone, G Carboni, R Cardinale, A Cardini, L Carson, K Carvalho Akiba, G Casse, M Cattaneo, M Charles, P Charpentier, N Chiapolini, X Cid Vidal, PJ Clark, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Coca, V Coco, J Cogan, P Collins

Abstract:

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs0→J/Ψf0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the Bs0 system. Using a fit to the Π+Π- mass spectrum with interfering resonances gives Rf0/Φ≡Γ(Bs0→J/Ψf0,f0→Π+Π -)Γ(Bs0→J/Ψφ,φ →K+K-)=0.252-0.032-0.033+ 0.046+0.027. In the interval ±90 MeV around 980 MeV, corresponding to approximately two full f0 widths we also find R' ≡ Γ(Bs0→J/Ψf0,f0→Π+Π-)-980 Mev < 90 Mev)/Γ(Bs0→J/Ψφ,φ→K +K-)=0.162±0.022±0.016, where in both cases the uncertainties are statistical and systematic, respectively. © 2011 CERN.

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First observation of B⁰s→D*s2+Xμν̄- decays

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 698:1 (2011) 14-20

Authors:

R Aaij, B Adeva, M Adinolfi, C Adrover, A Affolder, M Agari, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, J Amoraal, J Anderson, R Antunes Nobrega, RB Appleby, O Aquines Gutierrez, A Arefyev, L Arrabito, M Artuso, E Aslanides, G Auriemma, S Bachmann, DS Bailey, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, S Basiladze, A Bates, C Bauer, T Bauer, A Bay, I Bediaga, K Belous, I Belyaev, M Benayoun, G Bencivenni, R Bernet, M Bettler, M van Beuzekom, S Bifani, A Bizzeti, PM Bjørnstad, T Blake, F Blanc, C Blanks, J Blouw, S Blusk, A Bobrov, V Bocci, B Bochin, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, E Bos, T Bowcock, C Bozzi, T Brambach, J van den Brand, J Bressieux, S Brisbane, M Britsch, T Britton, NH Brook, H Brown, A Büchler-Germann, A Bursche, J Buytaert, S Cadeddu, JM Caicedo Carvajal, O Callot, M Calvi, M Calvo Gomez, A Camboni, W Cameron, L Camilleri, P Campana, A Carbone, G Carboni, R Cardinale, A Cardini, L Carson, K Carvalho Akiba, G Casse, M Cattaneo, M Charles, P Charpentier, J Cheng, N Chiapolini, A Chlopik, J Christiansen, P Ciambrone, X Cid Vidal, PJ Clark

Abstract:

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0s→D+s+Xμν̄ and B0s→D0K+Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ and Ds2*(2573)+ mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B0s→Ds2*+Xμν̄)/B(B0s→Xμν̄)=(3.3±1.0±0.4)%, and B(B0s→D+s1Xμν̄)/B(B0s→Xμν̄)=(5.4±1.2±0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D*+s2 state in B0s decays; we also measure its mass and width. © 2011 CERN.

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Measurement of V⁰ production ratios in pp collisions at s√ = 0.9 and 7TeV

Journal of High Energy Physics 2011:8 (2011)

Authors:

R Aaij, B Adeva, M Adinolfi, C Adrover, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, G Alkhazov, PA Cartelle, AA Alves, S Amato, Y Amhis, J Anderson, RB Appleby, OA Gutierrez, L Arrabito, A Artamonov, M Artuso, E Aslanides, G Auriemma, S Bachmann, JJ Back, DS Bailey, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, A Bates, C Bauer, T Bauer, A Bay, I Bediaga, K Belous, I Belyaev, E Ben-Haim, M Benayoun, G Bencivenni, S Benson, R Bernet, MO Bettler, M Van Beuzekom, A Bien, S Bifani, A Bizzeti, PM Bjørnstad, T Blake, F Blanc, C Blanks, J Blouw, S Blusk, A Bobrov, V Bocci, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, TJV Bowcock, C Bozzi, T Brambach, J Van Den Brand, J Bressieux, D Brett, S Brisbane, M Britsch, T Britton, NH Brook, A Büchler-Germann, I Burducea, A Bursche, J Buytaert, S Cadeddu, JMC Carvajal, O Callot, M Calvi, MC Gomez, A Camboni, P Campana, A Carbone, G Carboni, R Cardinale, A Cardini, L Carson, KC Akiba, G Casse, M Cattaneo, M Charles, P Charpentier, N Chiapolini, XC Vidal, G Ciezarek, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Coca

Abstract:

The Ā/A and Ā/K0S production ratios are measured by the LHCb detector from 0.3 nb-1 of pp collisions delivered by the LHC at s√ = 0.9TeV and 1.8 nb-1 at s√ = 7TeV. Both ratios are presented as a function of transverse momentum, pT, and rapidity, y, in the ranges 0.15 < pT < 2.50GeV/c and 2.0 < y < 4.5. Results at the two energies are in good agreement as a function of rapidity loss, Δy = ybeam - y, and are consistent with previous measurements. The ratio Ā/A, measuring the transport of baryon number from the collision into the detector, is smaller in data than predicted in simulation, particularly at high rapidity. The ratio Ā/K0S , measuring the baryon-to-meson suppression in strange quark hadronisation, is significantly larger than expected.

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Measurement of the inclusive Φ cross-section in pp collisions at s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 703:3 (2011) 267-273

Authors:

R Aaij, B Adeva, M Adinolfi, C Adrover, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, J Anderson, RB Appleby, O Aquines Gutierrez, L Arrabito, A Artamonov, M Artuso, E Aslanides, G Auriemma, S Bachmann, JJ Back, DS Bailey, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, A Bates, C Bauer, TH Bauer, A Bay, I Bediaga, K Belous, I Belyaev, E Ben-Haim, M Benayoun, G Bencivenni, S Benson, J Benton, R Bernet, MO Bettler, M van Beuzekom, A Bien, S Bifani, A Bizzeti, PM Bjørnstad, T Blake, F Blanc, C Blanks, J Blouw, S Blusk, A Bobrov, V Bocci, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, TJV Bowcock, C Bozzi, T Brambach, J van den Brand, J Bressieux, D Brett, S Brisbane, M Britsch, T Britton, NH Brook, A Büchler-Germann, A Bursche, J Buytaert, S Cadeddu, JM Caicedo Carvajal, O Callot, M Calvi, M Calvo Gomez, A Camboni, P Campana, A Carbone, G Carboni, R Cardinale, A Cardini, L Carson, K Carvalho Akiba, G Casse, M Cattaneo, M Charles, P Charpentier, N Chiapolini, X Cid Vidal, PEL Clarke, M Clemencic, HV Cliff, J Closier, C Coca, V Coco

Abstract:

The cross-section for inclusive Φ meson production in pp collisions at a centre-of-mass energy of s=7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the Φ transverse momentum pT and rapidity y in the region 0.6

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News from the flavour frontier - Heavy quark physics at the LHC

Proceedings of Science 2011-July (2011)

Abstract:

Results are presented on heavy flavour results from LHC data collected in 2010 and the early months of the 2011 run. All experiments have contributed to studies of heavy flavour production, where a wide range of measurements are now available. In the domain of heavy flavour decays there exist many observables which are highly sensitive to physics beyond the Standard Model. Here several benchmark analyses of LHCb already match or surpass in precision those of the B-factories and Tevatron. The other experiments, in particular CMS with its search for the rare decay B0s → μ+ μ-, are now augmenting this programme.

Guy Wilkinson

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First observation of Bs⁰→J/Ψf0(980) decays

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Abstract:

First observation of B⁰s→D*s2+Xμν̄- decays

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Measurement of V⁰ production ratios in pp collisions at s√ = 0.9 and 7TeV

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Measurement of the inclusive Φ cross-section in pp collisions at s=7 TeV

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News from the flavour frontier - Heavy quark physics at the LHC

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Guy Wilkinson

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First observation of Bs0→J/Ψf0(980) decays

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First observation of B0s→D*s2+Xμν̄- decays

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Measurement of V0 production ratios in pp collisions at s√ = 0.9 and 7TeV

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Abstract:

Measurement of the inclusive Φ cross-section in pp collisions at s=7 TeV

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News from the flavour frontier - Heavy quark physics at the LHC

Abstract:

First observation of Bs⁰→J/Ψf0(980) decays

First observation of B⁰s→D*s2+Xμν̄- decays

Measurement of V⁰ production ratios in pp collisions at s√ = 0.9 and 7TeV