Observation of double charm production involving open charm in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $

Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P. Alvarez; Alves, A. A.; Amato, S.; Amhis, Y.; Anderson, J.; Appleby, R. B.; Gutierrez, O. Aquines; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Bachmann, S.; Back, J. J.; Balagura, V.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Bates, A.; Bauer, C.; Bauer, Th.; Bay, A.; Bediaga, I.; Belogurov, S.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Benayoun, M.; Bencivenni, G.; Benson, S.; Benton, J.; Bernet, R.; Bettler, M. O.; Beuzekom, M. van; Bień, A.; Bifani, S.; Bird, T.; Bizzeti, A.; Bjørnstad, P. M.; Blake, T.; Blanc, F.; Blanks, C.; Blouw, J.; Blusk, S.; Bobrov, A.; Bocci, V.; Bondar, A.; Bondar, N.; Bonivento, W.; Borghi, S.; Borgia, A.; Bowcock, T. J. V.; Bozzi, C.; Brambach, T.; Brand, J. van den; Bressieux, J.; Brett, D.; Britsch, M.; Britton, T.; Brook, N. H.; Brown, H.; Bruyn, K. De; Büchler-Germann, A.; Burducea, I.; Bursche, A.; Buytaert, J.; Cadeddu, S.; Callot, O.; Calvi, M.; Gomez, M. Calvo; Camboni, A.; Campana, P.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carson, L.; Akiba, K. Carvalho; Casse, G.; Cattaneo, M.; Cauet, Ch.; Charles, M.; Charpentier, Ph.; Chiapolini, N.; Ciba, K.; Vidal, X. Cid; Ciezarek, G.; Clarke, P. E. L.; Clemencic, M.; Cliff, H. V.; Closier, J.; Coca, C.; Coco, V.; Cogan, J.; Collins, P.; Comerma-Montells, A.; Contu, A.; Cook, A.; Coombes, M.; Corti, G.; Couturier, B.; Cowan, G. A.; Currie, R.; D’Ambrosio, C.; David, P.; Bonis, I. De; Capua, S. De; Cian, M. De; Miranda, J. M. De; Paula, L. De; Simone, P. De; Décamp, D.; Deckenhoff, M.; Degaudenzi, H.; Buono, L. Del; Deplano, C.; Деркач, Д.; Deschamps, O.; Dettori, F.; Dickens, J.; Dijkstra, H.; Batista, P. Diniz; Bonal, F. Domingo; Donleavy, S.; Dordei, F.; Suárez, A. Dosil; Dossett, D.; Dovbnya, A.; Dupertuis, F.; Dzhelyadin, R.; Dziurda, A.; Easo, S.; Egede, U.; Egorychev, V.; Eidelman, S.; Eijk, D. van; Eisele, F.; Eisenhardt, S.; Ekelhof, R.; Eklund, L.; Elsässer, Ch.; Elsby, D.; Pereira, D. Esperante; Falabella, A.; Färber, C.; Fardell, G.; Farinelli, C.; Farry, S.; Fave, V.; Albor, V. Fernandez; Ferro‐Luzzi, M.; Filippov, S.; Fitzpatrick, C.; Fontana, M.; Fontanelli, F.; Forty, R.; Francisco, O.; Frank, M.; Frei, C.; Frosini, M.; Furcas, S.; Torreira, A. Gallas; Galli, D.; Gandelman, M.; Gandini, P.; Gao, Y.; Garnier, J. C.; Garofoli, J.; Ticó, J. Garra; Garrido, L.; Gascon, D.; Gaspar, C.; Gauld, R.; Gauvin, N.; Gersabeck, M.; Gershon, T.; Ghez, Ph.; Gibson, V.; Gligorov, V. V.; Göbel, C.; Golubkov, D.; Golutvin, A.; Gomes, A.; Gordon, H. A.; Gándara, M. Grabalosa; Diaz, R. Graciani; Cardoso, L. A. 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doi:10.1007/jhep06(2012)141

Cited by 120 publications

(50 citation statements)

References 86 publications

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“…A large double charm production cross-section involving open charm in pp collisions at √ s = 7 TeV has been observed by the LHCb collaboration [15]. The measured cross-sections exceed the SPS expectations significantly [16][17][18][19][20] and agree with the DPS estimates.…”

Section: Introductionsupporting

confidence: 68%

“…The event selection for Υ → µ + µ − candidates follows previous LHCb studies [44], and the selection of C hadrons follows refs. [15,56]. Only good quality tracks [57], identified as muons [58], kaons, pions or protons [59] are used in the analysis.…”

Section: Event Selectionmentioning

confidence: 99%

“…These basic functions are used to build the components of the two dimensional mass fit following ref. [15]. For each C hadron the reconstructed signal sample consists of the following components:…”

Section: Jhep07(2016)052mentioning

confidence: 99%

“…The possible contribution from pile-up events is estimated from data following the method from refs. [15,56] by relaxing the requirement on χ 2 fit (ΥC) /ndf. Due to the requirements χ 2 fit (Υ) /ndf < 5 and χ 2 fit (C) /ndf < 5, the value of χ 2 fit (ΥC) /ndf does not exceed 5 units for signal events with Υ and C hadron from the same pp collision vertex.…”

Section: Jhep07(2016)052mentioning

confidence: 99%

See 3 more Smart Citations

Production of associated Y and open charm hadrons in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV via double parton scattering

Aaij¹,

Beteta²,

Adeva³

et al. 2016

J. High Energ. Phys.

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Section: Introductionsupporting

confidence: 68%

Section: Event Selectionmentioning

confidence: 99%

Section: Jhep07(2016)052mentioning

confidence: 99%

Section: Jhep07(2016)052mentioning

confidence: 99%

See 2 more Smart Citations

Production of associated Y and open charm hadrons in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV via double parton scattering

Aaij¹,

Beteta²,

Adeva³

et al. 2016

J. High Energ. Phys.

Self Cite

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“…The DPS processes have been studied in several final states, e.g. 4-jets by the AFS [40], UA2 [41], CDF [42], and ATLAS [43] collaborations, γ + 3-jets by the CDF [44] and D0 [45,46] collaborations, 2γ + 2-jets by the D0 [47] collaboration, W + 2-jets [48] and Υ + Υ [49] by the CMS collaboration, J/ψ + W [50] and J/ψ + Z [51] by the ATLAS collaboration, and double charm [52], Z + open charm [53] and Υ + open charm [54] by the LHCb collaboration. After having been first observed by the NA3 collaboration in pion-nuclear and proton-nuclear interactions [55,56], J/ψ pair production has been measured in pp collisions by the LHCb [57] and CMS [58] experiments at √ s = 7 TeV and by the ATLAS experiment [59] at √ s = 8 TeV.…”

Section: Jhep06(2017)047mentioning

confidence: 99%

Measurement of the J/ψ pair production cross-section in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

Aaij¹,

Adeva²,

Adinolfi³

et al. 2017

J. High Energ. Phys.

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Abstract:The production cross-section of J/ψ pairs is measured using a data sample of pp collisions collected by the LHCb experiment at a centre-of-mass energy of √ s = 13 TeV, corresponding to an integrated luminosity of 279 ±11 pb −1 . The measurement is performed for J/ψ mesons with a transverse momentum of less than 10 GeV/c in the rapidity range 2.0 < y < 4.5. The production cross-section is measured to be 15.2 ± 1.0 ± 0.9 nb. The first uncertainty is statistical, and the second is systematic. The differential cross-sections as functions of several kinematic variables of the J/ψ pair are measured and compared to theoretical predictions.Keywords: Hadron-Hadron scattering (experiments), Particle and resonance production, proton-proton scattering, QCD, Quarkonium The LHCb collaboration 33 IntroductionThe production mechanism of heavy quarkonia is a long-standing and intriguing problem in quantum chromodynamics (QCD), which is not fully understood even after over forty years of study. The colour-singlet model (CSM) [1-10] assumes the intermediate QQ state to be colourless and to have the same J P C quantum numbers as the final quarkonium state. Leading-order calculations in the CSM underestimate the J/ψ and ψ(2S) production cross-sections at high transverse momentum, p T , by more than one order of magnitude [11]. The gap between CSM predictions and experimental measurements is reduced when including next-to-leading-order corrections, but the agreement is still not satisfactory [12][13][14]. The non-relativistic QCD (NRQCD) model takes into account both colour-singlet (CS) and colour-octet (CO) states of the QQ pair [15][16][17]. It either describes the production cross-sections and polarisations at large p T or it describes the production cross-section at all p T values, but then fails to predict the polarisation [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. This puzzle can be probed via the production of pairs of quarkonia [34][35][36][37][38][39], where the interpretation of the measured cross-section could be simpler. In quarkonium-pair production, the selection rules in the CS process of leading-order (LO) NRQCD forbid the feed-down from cascade decays of excited C-even states. This feed-down from C-even states, e.g. χ c → J/ψ γ or χ b → Υ γ, plays an important role in single quarkonium production. It significantly complicates the precise comparison between data and model predictions, and makes the interpretation of polarisation measurements difficult. Besides the single parton scattering (SPS) process, the process of double parton scattering (DPS) can also contribute to quarkonium pair production. The DPS process is of great -1 -

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Heavy Quarkonium Production in Hadronic Collisions

Shao

2016

Heavy Quarkonium Production Phenomenology and Automation of One-Loop Scattering Amplitude Computations

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Observation of double charm production involving open charm in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $

Cited by 120 publications

References 86 publications

Production of associated Y and open charm hadrons in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV via double parton scattering

Production of associated Y and open charm hadrons in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV via double parton scattering

Measurement of the J/ψ pair production cross-section in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

Heavy Quarkonium Production in Hadronic Collisions

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