Observation of a $$ {\varLambda}_b^0 $$ − $$ {\overline{\varLambda}}_b^0 $$ production asymmetry in proton-proton collisions at $$ \sqrt{s} $$ = 7 and 8 TeV

Author:

,Aaij R.,Abdelmotteleb A. S. W.,Abellán Beteta C.,Ackernley T.,Adeva B.,Adinolfi M.,Afsharnia H.,Aidala C. A.,Aiola S.,Ajaltouni Z.,Akar S.,Albrecht J.,Alessio F.,Alexander M.,Alfonso Albero A.,Aliouche Z.,Alkhazov G.,Alvarez Cartelle P.,Amato S.,Amey J. L.,Amhis Y.,An L.,Anderlini L.,Andreianov A.,Andreotti M.,Archilli F.,Artamonov A.,Artuso M.,Arzymatov K.,Aslanides E.,Atzeni M.,Audurier B.,Bachmann S.,Bachmayer M.,Back J. J.,Baladron Rodriguez P.,Balagura V.,Baldini W.,Baptista Leite J.,Barlow R. J.,Barsuk S.,Barter W.,Bartolini M.,Baryshnikov F.,Basels J. M.,Bashir S.,Bassi G.,Batsukh B.,Battig A.,Bay A.,Beck A.,Becker M.,Bedeschi F.,Bediaga I.,Beiter A.,Belavin V.,Belin S.,Bellee V.,Belous K.,Belov I.,Belyaev I.,Bencivenni G.,Ben-Haim E.,Berezhnoy A.,Bernet R.,Berninghoff D.,Bernstein H. C.,Bertella C.,Bertolin A.,Betancourt C.,Betti F.,Bezshyiko Ia.,Bhasin S.,Bhom J.,Bian L.,Bieker M. S.,Bifani S.,Billoir P.,Birch M.,Bishop F. C. R.,Bitadze A.,Bizzeti A.,Bjørn M.,Blago M. P.,Blake T.,Blanc F.,Blusk S.,Bobulska D.,Boelhauve J. A.,Boente Garcia O.,Boettcher T.,Boldyrev A.,Bondar A.,Bondar N.,Borghi S.,Borisyak M.,Borsato M.,Borsuk J. T.,Bouchiba S. A.,Bowcock T. J. V.,Boyer A.,Bozzi C.,Bradley M. J.,Braun S.,Brea Rodriguez A.,Brodski M.,Brodzicka J.,Brossa Gonzalo A.,Brundu D.,Buonaura A.,Burke A. T.,Burr C.,Bursche A.,Butkevich A.,Butter J. S.,Buytaert J.,Byczynski W.,Cadeddu S.,Cai H.,Calabrese R.,Calefice L.,Calero Diaz L.,Cali S.,Calladine R.,Calvi M.,Calvo Gomez M.,Camargo Magalhaes P.,Campana P.,Campoverde Quezada A. F.,Capelli S.,Capriotti L.,Carbone A.,Carboni G.,Cardinale R.,Cardini A.,Carli I.,Carniti P.,Carus L.,Carvalho Akiba K.,Casais Vidal A.,Casse G.,Cattaneo M.,Cavallero G.,Celani S.,Cerasoli J.,Chadwick A. J.,Chapman M. G.,Charles M.,Charpentier Ph.,Chatzikonstantinidis G.,Chavez Barajas C. A.,Chefdeville M.,Chen C.,Chen S.,Chernov A.,Chobanova V.,Cholak S.,Chrzaszcz M.,Chubykin A.,Chulikov V.,Ciambrone P.,Cicala M. F.,Cid Vidal X.,Ciezarek G.,Clarke P. E. L.,Clemencic M.,Cliff H. V.,Closier J.,Cobbledick J. L.,Coco V.,Coelho J. A. B.,Cogan J.,Cogneras E.,Cojocariu L.,Collins P.,Colombo T.,Congedo L.,Contu A.,Cooke N.,Coombs G.,Corredoira I.,Corti G.,Costa Sobral C. M.,Couturier B.,Craik D. C.,Crkovská J.,Cruz Torres M.,Currie R.,Da Silva C. L.,Dadabaev S.,Dai L.,Dall’Occo E.,Dalseno J.,D’Ambrosio C.,Danilina A.,d’Argent P.,Davies J. E.,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 D.,De Simone P.,de Vries J. A.,Dean C. T.,Decamp D.,Del Buono L.,Delaney B.,Dembinski H.-P.,Dendek A.,Denysenko V.,Derkach D.,Deschamps O.,Desse F.,Dettori F.,Dey B.,Di Cicco A.,Di Nezza P.,Didenko S.,Dieste Maronas L.,Dijkstra H.,Dobishuk V.,Dong C.,Donohoe A. M.,Dordei F.,dos Reis A. C.,Douglas L.,Dovbnya A.,Downes A. G.,Dudek M. W.,Dufour L.,Duk V.,Durante P.,Durham J. M.,Dutta D.,Dziurda A.,Dzyuba A.,Easo S.,Egede U.,Egorychev V.,Eidelman S.,Eisenhardt S.,Ek-In S.,Eklund L.,Ely S.,Ene A.,Epple E.,Escher S.,Eschle J.,Esen S.,Evans T.,Falabella A.,Falmagne G,Fan J.,Fan Y.,Fang B.,Farry S.,Fazzini D.,Féo M.,Fernandez Prieto A.,Fernez A. D.,Ferrari F.,Ferreira Lopes L.,Ferreira Rodrigues F.,Ferreres Sole S.,Ferrillo M.,Ferro-Luzzi M.,Filippov S.,Fini R. A.,Fiorini M.,Firlej M.,Fischer K. M.,Fitzgerald D. S.,Fitzpatrick C.,Fiutowski T.,Fkiaras A.,Fleuret F.,Fontana M.,Fontanelli F.,Forty R.,Franco Lima V.,Franco Sevilla M.,Frank M.,Franzoso E.,Frau G.,Frei C.,Friday D. A.,Fu J.,Fuehring Q.,Funk W.,Gabriel E.,Gaintseva T.,Gallas Torreira A.,Galli D.,Gambetta S.,Gan Y.,Gandelman M.,Gandini P.,Gao Y.,Garau M.,Garcia Martin L. M.,Garcia Moreno P.,García Pardiñas J.,Garcia Plana B.,Garcia Rosales F. A.,Garrido L.,Gaspar C.,Geertsema R. E.,Gerick D.,Gerken L. L.,Gersabeck E.,Gersabeck M.,Gershon T.,Gerstel D.,Ghez Ph.,Gibson V.,Giemza H. K.,Giovannetti M.,Gioventù A.,Gironella Gironell P.,Giubega L.,Giugliano C.,Gizdov K.,Gkougkousis E. L.,Gligorov V. V.,Göbel C.,Golobardes E.,Golubkov D.,Golutvin A.,Gomes A.,Gomez Fernandez S.,Goncalves Abrantes F.,Goncerz M.,Gong G.,Gorbounov P.,Gorelov I. V.,Gotti C.,Govorkova E.,Grabowski J. P.,Grammatico T.,Granado Cardoso L. A.,Graugés E.,Graverini E.,Graziani G.,Grecu A.,Greeven L. M.,Grieser N. A.,Griffith P.,Grillo L.,Gromov S.,Gruberg Cazon B. R.,Gu C.,Guarise M.,Günther P. A.,Gushchin E.,Guth A.,Guz Y.,Gys T.,Hadavizadeh T.,Haefeli G.,Haen C.,Haimberger J.,Halewood-leagas T.,Hamilton P. M.,Hammerich J. P.,Han Q.,Han X.,Hancock T. H.,Hansmann-Menzemer S.,Harnew N.,Harrison T.,Hasse C.,Hatch M.,He J.,Hecker M.,Heijhoff K.,Heinicke K.,Hennequin A. M.,Hennessy K.,Henry L.,Heuel J.,Hicheur A.,Hill D.,Hilton M.,Hollitt S. E.,Hu J.,Hu J.,Hu W.,Hu X.,Huang W.,Huang X.,Hulsbergen W.,Hunter R. J.,Hushchyn M.,Hutchcroft D.,Hynds D.,Ibis P.,Idzik M.,Ilin D.,Ilten P.,Inglessi A.,Ishteev A.,Ivshin K.,Jacobsson R.,Jakobsen S.,Jans E.,Jashal B. K.,Jawahery A.,Jevtic V.,Jiang F.,John M.,Johnson D.,Jones C. R.,Jones T. P.,Jost B.,Jurik N.,Kandybei S.,Kang Y.,Karacson M.,Karpov M.,Keizer F.,Kenzie M.,Ketel T.,Khanji B.,Kharisova A.,Kholodenko S.,Kirn T.,Kirsebom V. S.,Kitouni O.,Klaver S.,Klimaszewski K.,Kmiec M. R.,Koliiev S.,Kondybayeva A.,Konoplyannikov A.,Kopciewicz P.,Kopecna R.,Koppenburg P.,Korolev M.,Kostiuk I.,Kot O.,Kotriakhova S.,Kravchenko P.,Kravchuk L.,Krawczyk R. D.,Kreps M.,Kress F.,Kretzschmar S.,Krokovny P.,Krupa W.,Krzemien W.,Kucewicz W.,Kucharczyk M.,Kudryavtsev V.,Kuindersma H. S.,Kunde G. J.,Kvaratskheliya T.,Lacarrere D.,Lafferty G.,Lai A.,Lampis A.,Lancierini D.,Lane J. J.,Lane R.,Lanfranchi G.,Langenbruch C.,Langer J.,Lantwin O.,Latham T.,Lazzari F.,Le Gac R.,Lee S. H.,Lefèvre R.,Leflat A.,Legotin S.,Leroy O.,Lesiak T.,Leverington B.,Li H.,Li P.,Li S.,Li Y.,Li Y.,Li Z.,Liang X.,Lin T.,Lindner R.,Lisovskyi V.,Litvinov R.,Liu G.,Liu H.,Liu S.,Lobo Salvia A.,Loi A.,Lomba Castro J.,Longstaff I.,Lopes J. H.,Lopez Solino S.,Lovell G. H.,Lu Y.,Lucchesi D.,Luchuk S.,Lucio Martinez M.,Lukashenko V.,Luo Y.,Lupato A.,Luppi E.,Lupton O.,Lusiani A.,Lyu X.,Ma L.,Ma R.,Maccolini S.,Machefert F.,Maciuc F.,Macko V.,Mackowiak P.,Maddrell-Mander S.,Madejczyk O.,Madhan Mohan L. R.,Maev O.,Maevskiy A.,Maisuzenko D.,Majewski M. W.,Malczewski J. J.,Malde S.,Malecki B.,Malinin A.,Maltsev T.,Malygina H.,Manca G.,Mancinelli G.,Manuzzi D.,Marangotto D.,Maratas J.,Marchand J. F.,Marconi U.,Mariani S.,Marin Benito C.,Marinangeli M.,Marks J.,Marshall A. M.,Marshall P. J.,Martellotti G.,Martinazzoli L.,Martinelli M.,Martinez Santos D.,Martinez Vidal F.,Massafferri A.,Materok M.,Matev R.,Mathad A.,Mathe Z.,Matiunin V.,Matteuzzi C.,Mattioli K. R.,Mauri A.,Maurice E.,Mauricio J.,Mazurek M.,McCann M.,Mcconnell L.,Mcgrath T. H.,McNab A.,McNulty R.,Mead J. V.,Meadows B.,Meier G.,Meinert N.,Melnychuk D.,Meloni S.,Merk M.,Merli A.,Meyer Garcia L.,Mikhasenko M.,Milanes D. A.,Millard E.,Milovanovic M.,Minard M.-N.,Minotti A.,Minzoni L.,Mitchell S. E.,Mitreska B.,Mitzel D. S.,Mödden A.,Mohammed R. A.,Moise R. D.,Mombächer T.,Monroy I. A.,Monteil S.,Morandin M.,Morello G.,Morello M. J.,Moron J.,Morris A. B.,Morris A. G.,Mountain R.,Mu H.,Muheim F.,Mulder M.,Müller D.,Müller K.,Murphy C. H.,Murray D.,Muzzetto P.,Naik P.,Nakada T.,Nandakumar R.,Nanut T.,Nasteva I.,Needham M.,Neri I.,Neri N.,Neubert S.,Neufeld N.,Newcombe R.,Nguyen T. D.,Nguyen-Mau C.,Niel E. M.,Nieswand S.,Nikitin N.,Nolte N. S.,Normand C.,Nunez C.,Oblakowska-Mucha A.,Obraztsov V.,O’Hanlon D. P.,Okamura S.,Oldeman R.,Olivares M. E.,Onderwater C. J. G.,O’neil R. H.,Ossowska A.,Otalora Goicochea J. M.,Ovsiannikova T.,Owen P.,Oyanguren A.,Pagare B.,Pais P. R.,Pajero T.,Palano A.,Palutan M.,Pan Y.,Panshin G.,Papanestis A.,Pappagallo M.,Pappalardo L. L.,Pappenheimer C.,Parker W.,Parkes C.,Passalacqua B.,Passaleva G.,Pastore A.,Patel M.,Patrignani C.,Pawley C. J.,Pearce A.,Pellegrino A.,Pepe Altarelli M.,Perazzini S.,Pereima D.,Pereiro Castro A.,Perret P.,Petric M.,Petridis K.,Petrolini A.,Petrov A.,Petrucci S.,Petruzzo M.,Pham T. T. H.,Philippov A.,Pica L.,Piccini M.,Pietrzyk B.,Pietrzyk G.,Pili M.,Pinci D.,Pisani F.,Resmi P. K.,Placinta V.,Plews J.,Plo Casasus M.,Polci F.,Poli Lener M.,Poliakova M.,Poluektov A.,Polukhina N.,Polyakov I.,Polycarpo E.,Ponce S.,Popov D.,Popov S.,Poslavskii S.,Prasanth K.,Promberger L.,Prouve C.,Pugatch V.,Puill V.,Pullen H.,Punzi G.,Qi H.,Qian W.,Qin J.,Qin N.,Quagliani R.,Quintana B.,Raab N. V.,Rabadan Trejo R. I.,Rachwal B.,Rademacker J. H.,Rama M.,Ramos Pernas M.,Rangel M. S.,Ratnikov F.,Raven G.,Reboud M.,Redi F.,Reiss F.,Remon Alepuz C.,Ren Z.,Renaudin V.,Ribatti R.,Ricciardi S.,Rinnert K.,Robbe P.,Robertson G.,Rodrigues A. B.,Rodrigues E.,Rodriguez Lopez J. A.,Rodriguez Rodriguez E. R. R.,Rollings A.,Roloff P.,Romanovskiy V.,Romero Lamas M.,Romero Vidal A.,Roth J. D.,Rotondo M.,Rudolph M. S.,Ruf T.,Ruiz Vidal J.,Ryzhikov A.,Ryzka J.,Saborido Silva J. J.,Sagidova N.,Sahoo N.,Saitta B.,Salomoni M.,Sanchez Gras C.,Santacesaria R.,Santamarina Rios C.,Santimaria M.,Santovetti E.,Saranin D.,Sarpis G.,Sarpis M.,Sarti A.,Satriano C.,Satta A.,Saur M.,Savrina D.,Sazak H.,Scantlebury Smead L. G.,Scarabotto A.,Schael S.,Schiller M.,Schindler H.,Schmelling M.,Schmidt B.,Schneider O.,Schopper A.,Schubiger M.,Schulte S.,Schune M. H.,Schwemmer R.,Sciascia B.,Sellam S.,Semennikov A.,Senghi Soares M.,Sergi A.,Serra N.,Sestini L.,Seuthe A.,Seyfert P.,Shang Y.,Shangase D. M.,Shapkin M.,Shchemerov I.,Shchutska L.,Shears T.,Shekhtman L.,Shen Z.,Shevchenko V.,Shields E. B.,Shimizu Y.,Shmanin E.,Shupperd J. D.,Siddi B. G.,Silva Coutinho R.,Simi G.,Simone S.,Skidmore N.,Skwarnicki T.,Slater M. W.,Slazyk I.,Smallwood J. C.,Smeaton J. G.,Smetkina A.,Smith E.,Smith M.,Snoch A.,Soares M.,Soares Lavra L.,Sokoloff M. D.,Soler F. J. P.,Solovev A.,Solovyev I.,Souza De Almeida F. L.,Souza De Paula B.,Spaan B.,Spadaro Norella E.,Spradlin P.,Stagni F.,Stahl M.,Stahl S.,Steinkamp O.,Stenyakin O.,Stevens H.,Stone S.,Stramaglia M. E.,Straticiuc M.,Strekalina D.,Suljik F.,Sun J.,Sun L.,Sun Y.,Svihra P.,Swallow P. N.,Swientek K.,Szabelski A.,Szumlak T.,Szymanski M.,Taneja S.,Tanner A. R.,Terentev A.,Teubert F.,Thomas E.,Thompson D. J. D.,Thomson K. A.,Tisserand V.,T’Jampens S.,Tobin M.,Tomassetti L.,Torres Machado D.,Tou D. Y.,Tran M. T.,Trifonova E.,Trippl C.,Tuci G.,Tully A.,Tuning N.,Ukleja A.,Unverzagt D. J.,Ursov E.,Usachov A.,Ustyuzhanin A.,Uwer U.,Vagner A.,Vagnoni V.,Valassi A.,Valenti G.,Valls Canudas N.,van Beuzekom M.,Van Dijk M.,van Herwijnen E.,Van Hulse C. B.,van Tilburg J.,van Veghel M.,Vazquez Gomez R.,Vazquez Regueiro P.,Vázquez Sierra C.,Vecchi S.,Velthuis J. J.,Veltri M.,Venkateswaran A.,Veronesi M.,Vesterinen M.,Vieira D.,Vieites Diaz M.,Viemann H.,Vilasis-Cardona X.,Vilella Figueras E.,Villa A.,Vincent P.,Volle F. C.,Vom Bruch D.,Vorobyev A.,Vorobyev V.,Voropaev N.,Vos K.,Waldi R.,Walsh J.,Wang C.,Wang J.,Wang J.,Wang J.,Wang J.,Wang M.,Wang R.,Wang Y.,Wang Z.,Wang Z.,Ward J. A.,Wark H. M.,Watson N. K.,Weber S. G.,Websdale D.,Weisser C.,Westhenry B. D. C.,White D. J.,Whitehead M.,Wiederhold A. R.,Wiedner D.,Wilkinson G.,Wilkinson M.,Williams I.,Williams M.,Williams M. R. J.,Wilson F. F.,Wislicki W.,Witek M.,Witola L.,Wormser G.,Wotton S. A.,Wu H.,Wyllie K.,Xiang Z.,Xiao D.,Xie Y.,Xu A.,Xu J.,Xu L.,Xu M.,Xu Q.,Xu Z.,Xu Z.,Yang D.,Yang S.,Yang Y.,Yang Z.,Yang Z.,Yao Y.,Yeomans L. E.,Yin H.,Yu J.,Yuan X.,Yushchenko O.,Zaffaroni E.,Zavertyaev M.,Zdybal M.,Zenaiev O.,Zeng M.,Zhang D.,Zhang L.,Zhang S.,Zhang S.,Zhang Y.,Zhang Y.,Zharkova A.,Zhelezov A.,Zheng Y.,Zhou X.,Zhou Y.,Zhovkovska V.,Zhu X.,Zhu Z.,Zhukov V.,Zonneveld J. B.,Zou Q.,Zucchelli S.,Zuliani D.,Zunica G.

Abstract

Abstract This article presents differential measurements of the asymmetry between $$ {\varLambda}_b^0 $$ Λ b 0 and $$ {\overline{\varLambda}}_b^0 $$ Λ ¯ b 0 baryon production rates in proton-proton collisions at centre-of-mass energies of $$ \sqrt{s} $$ s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb1. The $$ {\varLambda}_b^0 $$ Λ b 0 baryons are reconstructed through the inclusive semileptonic decay $$ {\varLambda}_b^0 $$ Λ b 0 $$ {\varLambda}_c^{+} $$ Λ c + μ$$ \overline{\nu} $$ ν ¯ μX. The production asymmetry is measured both in intervals of rapidity in the range 2.15 < y < 4.10 and transverse momentum in 2 < pT< 27 GeV/c. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both $$ \sqrt{s} $$ s = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in Pythia and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b-hadron production at LHC energies.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Reference42 articles.

1. E. Norrbin and T. Sjöstrand, Production and hadronization of heavy quarks, Eur. Phys. J. C 17 (2000) 137 [hep-ph/0005110] [INSPIRE].

2. E. Norrbin and R. Vogt, Bottom production asymmetries at the LHC, in 5th Workshop on Electronics for the LHC Experiments (LEB 99) (2000) [hep-ph/0003056] [INSPIRE].

3. E. Norrbin, Heavy quark production asymmetries, in 1999 International Europhysics Conference on High-Energy Physics, pp. 408–410 (1999) [hep-ph/9909437] [INSPIRE].

4. E. Braaten, Y. Jia and T. Mehen, B production asymmetries in perturbative QCD, Phys. Rev. D 66 (2002) 034003 [hep-ph/0108201] [INSPIRE].

5. W.K. Lai and A.K. Leibovich, Λc+/$$ {\varLambda}_c^{-} $$− and $$ {\varLambda}_b^0 $$/$$ {\overline{\varLambda}}_b^0 $$ production asymmetry at the LHC from heavy quark recombination, Phys. Rev. D 91 (2015) 054022 [arXiv:1410.2091] [INSPIRE].

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Nonuniversality of heavy quark hadronization in elementary high-energy collisions;Physical Review C;2024-09-09

2. The LHCb Upgrade I;Journal of Instrumentation;2024-05-01

3. Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at s=13TeV;Physical Review Letters;2024-02-20

4. CP Violation in Baryon Decays at LHCb;Symmetry;2023-02-15

5. The Forward Physics Facility at the High-Luminosity LHC;Journal of Physics G: Nuclear and Particle Physics;2023-01-20

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3