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Study of the production of Λ_b^0 band ~0 hadrons in pp collisions and first measurement of the Λ_b^0→J/ψpK^- branching fraction

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chinese Physics c 2016年第1期40卷 1-16页

作者： O.Kochebina M.Kolpin I.Komarov R.F.Koopman P.Koppenburg M.Kozeiha L.Kravchuk K.Kreplin M.Kreps G.Krocker P.Krokovny F.Kruse W.Krzemien W.Kucewicz M.Kucharczyk V.Kudryavtsev A.K.Kuonen K.Kurek T.Kvaratskheliya D.Lacarrere G.Lafferty A.Lai D.Lambert G.Lanffanchi c.Langenbruch B.Langhans T.Latham c.Lazzeroni R.Le Gac J.van Leerdam J.-P.Lees R.Lefevre A.Leflat J.Lefrancois E.Lemos cid O.Leroy T.Lesiak B.Leverington Y.Li T.Likhomanenko M.Liles R.Lindner c.Linn F.Lionetto B.Liu X.Liu D.Loh I.Longstaff J.H.Lopes D.Lucchesi M.Lucio Martinez H.Luo A.Lupato E.Luppi O.Lupton A.Lusiani F.Machefert F.Maciuc O.Maev K.Maguire S.Malde A.Malinin G.Manca G.Mancinelli P.Manning A.Mapelli J.Maratas J.F.Marchand U.Marconi c.Marin Benito P.Marino J.Marks G.Martellottil M.Martin M.Martinelli D.Martinez Santos F.Martinez Vidal D.Martins Tostes A.Massafferri R.Matev A.Mathad Z.Mathe c.Matteuzzi A.mauri B.maurin A.Mazurov M.Mccann J.Mccarthy A.McNab R.McNulty B.Meadows F.Meier M.Meissner D.Melnychuk M.Merk E Michielin D.A.Milanes M.-N.Minard D.S.Mitzel J.Molina Rodrigue I.A.Monroy S.Monteil M.Morandin P.Morawski A.Morda M.J.Morello J.Moron A.B.Morris R.Mountain F.Muheim D.Miiller J.Muller K.Muller V.Muller M.Mussini B.Muster P.Naik T.Nakada R.Nandakumar A.Nandi I.Nasteva M.Needham N.Neri S.Neubert N.Neufeld M.Neuner A.D.nguyen T.D.nguyen c.nguyen-mau V.Niess R.Niet N.Nikitin T.Nikodem D.Ninci A.Novoselov D.P.O'Hanlon A.Oblakowska-Mucha V.Obraztsov S.Ogilvy O.Okhrimenko R.Oldeman c.J.G.Onderwater B.Osorio Rodrigues J.M.Otalora Goicochea A.Otto P.Owen A.Oyanguren A.Palano F.Palombo M.Palutan J.Panman A.Papanestis M.Pappagallo L.L.Pappalardo c.Pappenheimer c.Parkes G.Passaleva G.D.Patel M.Patel c.Patrignani A.Pearce A.Pellegrino G.Penso M.Pepe Altarelli S.Perazzini P.Perret L.Pescatore K.Petridis A.Petrolini M.Petruzzo E.Picatoste Olloqui B.Pietrzyk T:.Pilar D.Pinci A.Pistone A.Piucci S.Playfer M.Plo casasus T.Poikela F.Polci A.Poluektov I.Polyakov E.Polycarpo A.Popov D.Popov B.Popovici c.Potterat E.Price J.D.Price J.Prisciandaro A.Pritchard centro Brasileiro de Pesquisas Ffsicas(cBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil center for High Energy Physics Tsinghua UniversityBeijingChina LAPP Universite Savoie Mont-BlancCNRS/IN2P3Annecy-Le-VieuxFrance clermont Universite Universite Blaise PascalCNRS/IN2P3LPCclermont-FerrandFrance cPPM Aix-Marseille UniversitYCNRS/IN2P3MarseilleFrance LAL Universite Paris-SudCNRS/IN2P3OrsayFrance LPNHE Universite Pierre et Marie CurieUniversite Paris DiderotCNRS/IN2P3ParisFrance Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-lnstitut fur Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland Sezione INFN di Bari BariItaly Sezione INFN di Bologna BolognaItaly Sezione INFN di cagliari CagliariItaly Sezione INFN di Ferrara FerraraItaly Sezione INFN di Firenze FirenzeItaly Laboratori Nazionali dell'INFN di Prascati FrascatiItaly Sezione INFN di Genova GenovaItaly Sezione INFN di Milnno Bicocca MilunoItaly Sezione INFN di Milano MilanoItaly Sezione INFN di Padova PadovaItaly Sezione INFN di Pisa PisaItaly Sezione INFN di Roma Tor Vergata RomaItaly Sezione INFN di Roma La Sapienza RomaItaly Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Krak6wPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakowPoland National center for Nuclear Research(NcBJ) WarsawPoland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-MagureleRomania Petersburg Nuclear Physics Institute(PNPI) GatchinaRussia Institute of Theoretical and Experimental Physics(ITEP) MoscowRussia Institute of Nuclear Physics Moscow State University(SINP MSU)MoscowRussia Institute for Nuclear Research of the Russian Academy of Sciences(INR RAN) MoscowRussia Budker Institute of Nuclear Physics(SB RAS)and Novosibirsk State University No

The product of the ∧0/b （-B/0） differential production cross-section and the branching fraction of the decay ∧0/b→ J/ψ pK-（-B/0→ J/ψ-K＊（892）0）is measured as a function of the beauty hadron transverse momentum, PT, and rapidity, y. The kinematic region of the measurements is pT〈20 GeV/c and 2.0 〈g〈*** measurements use a data sample corresponding to an integrated luminosity of 3fb-1 collected by the LHcb detector in pp collisions at centre-of-mass energies √s=7 TeV in 2011 and √s=8 TeV in 2012. Based on previous LHcb results of the fragmentation fraction ratio,f∧0/b/fd,the branching fraction of the decay ∧0/b→ J/ψ pK-is measured to be B（∧0/b→ J/ψ pK-）=（3.17±0.04±0.07±0.34＋0.45/-0.28）×10-4,where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay -B/0 →J/ψ-K＊（892）0,and the fourth is due to the knowledge of f∧0/b/*** sum of the asymmetries in the production and decay between ∧0/b and ∧0/bis also measured as a function of PT and *** previously published branching fraction of ∧0/b→ J/ψ pπ-,relative to that of ∧0/b→ J/ψ pK-,is updated. The branching fractions of ∧0/b→P＋c（→ J/ψp）K-are determined.

关键词： production cross-section branching fraction b hadrons proton-proton collisions

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Seamless handover between unicast and multicast multimedia streams

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Journal of Zhejiang University-Science c(computers and Electronics) 2014年第10期15卷 929-942页

作者： mau-Luen THAM chee-Onn cHOW Yi-han XU Khong Neng cHOONG cheng Suan LEE Department of Electrical Engineering Faculty of Engineering University of Malaya college of Information Science and Technology Nanjing Forestry University Wireless communication cluster MIMOS BerhadKuala Lumpur 57000 Malaysia Power-All Networks Jalan AmpangKuala Lumpur 50450 Malaysia

With the deployment of heterogeneous networks, mobile users are expecting ubiquitous connectivity when using applications. For bandwidth-intensive applications such as Internet Protocol Television(IPTV), multimedia contents are typically transmitted using a multicast delivery method due to its bandwidth efficiency. However, not all networks support multicasting. Multicasting alone could lead to service disruption when the users move from a multicast-capable network to a non-multicast network. In this paper, we propose a handover scheme called application layer seamless switching(ALSS) to provide smooth real-time multimedia delivery across unicast and multicast networks. ALSS adopts a soft handover to achieve seamless playback during the handover period. A real-time streaming testbed is implemented to investigate the overall handover performance, especially the overlapping period where both network interfaces are receiving audio and video packets. Both the quality of service(QoS) and objective-mapped quality of experience(QoE) metrics are measured. Experimental results show that the overlapping period takes a minimum of 56 and 4 ms for multicast-to-unicast(M2U) and unicast-to-multicast(U2M) handover, respectively. The measured peak signal-to-noise ratio(PSNR) confirms that the frame-by-frame quality of the streamed video during the handover is at least 33 dB, which is categorized as good based on ITU-T recommendations. The estimated mean opinion score(MOS) in terms of video playback smoothness is also at a satisfactory level.

关键词： Experimental approach Multimedia session continuity Seamless handover Unicast/multicast switching Multimedia streaming

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A machine learning model for colorectal liver metastasis post-hepatectomy prognostications

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Hepatobiliary Surgery and Nutrition 2023年第4期12卷 495-506,I0007-I0016页

作者： cynthia Sin Nga Lam Alina Ashok Bharwani Evelyn Hui Yi chan Vernice Hui Yan chan Howard Lai Ho Au Margaret Kay Ho Shireen Rashed Bernard Ming Hong Kwong Wentao Fang Ka Wing Ma chung mau Lo Tan To cheung Li Ka Shing Faculty of Medicine The University of Hong KongHong Kong SARChina Department of Surgery Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong SARChina

Background:currently,surgical resection is the mainstay for colorectal liver metastases(cRLM)management and the only potentially curative treatment *** tools can support patient selection for surgical resection to maximize therapeutic *** study aimed to develop a survival prediction model using machine learning based on a multicenter patient sample in Hong ***:Patients who underwent hepatectomy for cRLM between 1 January 2009 and 31 December 2018 in four hospitals in Hong Kong were included in the *** analysis was performed using cox proportional hazards(cPH).A stepwise selection on cox multivariable models with Least Absolute Shrinkage and Selection Operator(LASSO)regression was applied to a multiply-imputed dataset to build a prediction *** model was validated in the validation set,and its performance was compared with that of Fong clinical Risk Score(cRS)using concordance ***:A total of 572 patients were included with a median follow-up of 3.6 *** full models for overall survival(OS)and recurrence-free survival(RFS)consist of the same 8 established and novel variables,namely colorectal cancer nodal stage,cRLM neoadjuvant treatment,charlson comorbidity Score,pre-hepatectomy bilirubin and carcinoembryonic antigen(cEA)levels,cRLM largest tumor diameter,extrahepatic metastasis detected on positron emission-tomography(PET)-scan as well as KRAS *** cRLM Machine-learning Algorithm Prognostication model(cMAP)demonstrated better ability to predict OS(c-index=0.651),compared with the Fong cRS for 1-year(c-index=0.571)and 5-year OS(c-index=0.574).It also achieved a c-index of 0.651 for ***:We present a promising machine learning algorithm to individualize prognostications for patients following resection of cRLM with good discriminative ability.

关键词： Machine-learning colorectal liver metastasis(cRLM) prognostic model survival analysis hepatectomy outcome

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Role of c11-FDG dual-tracer PET-cT scan in metastatic screening of hepatocellular carcinoma-a cost-effectiveness analysis

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Hepatobiliary Surgery and Nutrition 2021年第3期10卷 301-307页

作者： Kevin K.W.chu Albert c.Y.chan Ka Wing Ma Wong Hoi She Wing chiu Dai Kenneth S.H.chok Tan To cheung chung mau Lo Department of Surgery The University of Hong KongHong KongChina

Background:We aimed to identify predictive factors for positron emission tomography(PET)-detected hepatocellular carcinoma(Hcc)metastasis and a cost-effective approach to preoperative PET-computed tomography(cT)for detecting ***:clinicopathological and survival data of Hcc patients having PET-cT with 18F-fludeoxyglucose(FDG)and 11c-acetate(AcT)following contrast-enhanced cT/magnetic resonance imaging(MRI)for preoperative tumor staging were *** logistic regression was performed to identify predictive factors for PET-detected metastasis.A cost-benefit analysis model was built for the incurred costs and the impact of PET-cT findings on treatment strategy was ***:Totally 152 patients were ***-tracer PET-cT detected metastasis in 17 patients(11%).By multivariate analysis,alpha-fetoprotein(AFP)≥400 ng/mL[relative risk(RR):4.30,95%confidence interval(cI):1.41-13.15,P=0.011]and bilobar disease(RR:3.94,95%cI:1.24-12.52,P=0.014)were independent predictive factors for PET-detected ***-cT findings altered the treatment strategy for 12 patients(7.9%);three partial hepatectomies,eight episodes of transarterial chemoembolization(TAcE)and one episode of ablation were avoided,with an estimated cost-saving of US$91,000,$150,000 and$10,600 *** the PET-cT been performed only for patients with AFP≥400 ng/mL or bilobar disease(n=74),metastasis would have been confirmed in 14 patients(18.9%),and the cost-saving per patient was estimated at US$1,***:Dual-tracer PET-cT is cost-effective and useful for preoperative Hcc staging in patients with AFP≥400 ng/mL or bilobar *** routine use in preoperative workup for all Hcc patients is not *** disease with AFPcan achieve good negative predictive value for PET-detected *** patients with either factor can avoid unnecessary procedures and is thus cost-effective for preoperative Hcc workup.

关键词： cost-effectiveness study dual-tracer positron emission tomography-computed tomography(dual-tracer PET-cT) hepatocellular carcinoma(Hcc) metastatic screening preoperative investigation

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Versatility and viability of hepatic venoplasty in live donor liver transplantation using the right lobe with the middle hepatic vein

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Hepatobiliary & Pancreatic Diseases International 2005年第4期4卷 618-621页

作者： See-ching chan chung-mau Lo chi-Leung Liu Yik Wong Sheung-Tat Fan centre for the Study of Liver Disease and Departments of Surgery The University of Hong KongPokfulamHong KongChina Radiology The University of Hong Kong PokfulamHong KongPokfulamHong KongChina

Including the middle hepatic vein in the right lobe liver graft has the advantage of providing direct venous drainage of the right anterior segment. To allow unimpeded passage of blood flow, we previously designed venoplasty of the middle and right hepatic veins. We found that venoplasty is also feasible when the inferior right hepatic vein is near to the right hepatic vein, or when multiple segment 8 hepatic vein orifices are exposed adjacent to the middle hepatic vein at the graft transection surface. By joining the hepatic vein orifices into a single opening, the anastomosis into the inferior vena cava is much facilitated. The technique is simple, yet versatile , and able to cope with variation of the configurations of the hepatic vein.

关键词： venoplasty live donor liver transplantation

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Survival outcomes of liver transplantation for hepatocellular carcinoma in patients with normal, high and very high preoperative alpha-fetoprotein levels

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World Journal of Hepatology 2018年第2期10卷 308-318页

作者： Wong Hoi She Albert chi Yan chan Tan To cheung chung mau Lo Kenneth Siu Ho chok Department of Surgery University of Hong Kong Department of Surgery and State Key Laboratory for Liver Research University of Hong Kong

AIM To investigate the impact of alpha-fetoprotein(AFP) on long-term recurrence rate and overall survival and we also aimed to define the level of AFP leading to a higher risk of disease recurrence and affecting patient *** Data of adult patients who received liver transplant(LT) for hepatocellular carcinoma(Hcc) at our hospital from January 2000 to December 2013 were reviewed. Reviewed data included demographic characteristics, preoperative AFP level, operative details, follow-up details, and survival outcomes. Patients were mostly listed for LT based on Milan or UcSF criteria. For the purpose of this study, normal AFP level was defined as AFP value ccordingly. Survival rates were plotted as Kaplan-Meier curves and compared by log-rank analysis. continuous variables were expressed as median(interquartile range). categorical variables were compared by Spearman's test. Discriminative analysis was used to define the lowest value of AFP that could affect the overall survival in study population. Statistical significance was defined by a P value of cc in the study period. Eight-four of them received deceaseddonor LT and 166 had living-donor LT. The patients were divided into 3 groups: Group A, AFP c, AFP ≥ 400 ng/m L(n = 36). The commonest etiology was hepatitis-B-related cirrhosis. The Model for End-stage Liver Disease scores in these groups were similar(median, 13 vs 13 vs 12; P = 0.745). The time to operation in Group A was longer(median, 94 vs 31 vs 35 d; P = 0.001). The groups were similar in hospital mortality(P = 0.626) and postoperative complication(P = 0.702). Pathology of explants showed that the 3 groups had similar numbers of tumor nodules, b

关键词： Alpha-fetoprotein Liver transplantation Recurrence Survival

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Donor ductal anomaly is not a contraindication to right liver lobe donation

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Hepatobiliary & Pancreatic Diseases International 2019年第4期18卷 343-347页

作者： Kenneth SH chok James YY Fung Wing chiu Dai Sui Ling Sin Ka Wing Ma Albert cY chan Tan To cheung chung mau Lo Department of Surgery The University of Hong Kong102 Pok Fu Lam RoadHong KongChina State Key Laboratory for Liver Research The University of Hong Kong102 Pok Fu Lam RoadHong KongChina Department of Medicine The University of Hong Kong102 Pok Fu Lam RoadHong KongChina

Background:Data of living-donor liver transplantation(LDLT)suggested that donor ductal anomaly may contribute to postoperative biliary complications in recipients and in *** retrospective study aimed to determine if the occurrence of postoperative biliary stricture in donors or recipients in rightlobe LDLT(RLDLT)is related to donor biliary anatomy ***:We analyzed our RLDLT recipients’clinical data and those of their graft *** recipients were divided into 2 groups:with and without postoperative biliary *** 2 groups were *** primary endpoints were donor biliary anatomy type and postoperative biliary complication incidence;the secondary endpoints were 1-,3-and 5-year graft and patient survival ***:Totally 127 patients were included in the study;25(19.7%)of them developed biliary anastomotic *** these 25 patients,16 had type A biliary anatomy,3 had type B,2 had type c,3 had type D,and 1 had type *** the 127 donors,96(75.6%)had type A biliary anatomy,13(10.2%)had type B,6(4.7%)had type c,10(7.9%)had type D,and 2(1.6%)had type *** stricture was seen in 2 donors,who had type A biliary *** of the recipients or donors developed bile *** association between the occurrence of postoperative biliary stricture and donor biliary anatomy type was found(P=0.527).conclusions:The incidence of biliary stricture in donors or recipients after RLDLT was not related to donor biliary anatomy *** postoperative complications were similar in whatever type of donor bile duct anatomy,donor ductal anomaly should not be considered a contraindication to donation of right liver lobe.

关键词： Living donor liver transplantation Right liver donation Biliary complications cholangiograms Ductal anomaly

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Validated model for prediction of recurrent hepatocellular carcinoma after liver transplantation in Asian population

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World Journal of Gastrointestinal Oncology 2019年第4期11卷 322-334页

作者： Ka Wing Ma Wong Hoi She Albert chi Yan chan Tan To cheung James Yan Yue Fung Wing chiu Dai chung mau Lo Kenneth Siu Ho chok Department of Surgery the University of Hong Kong Department of Surgery and State Key Laboratory for Liver Research the University of Hong Kong Department of Medicine and State Key Laboratory for Liver Research The University of Hong Kong

BAcKGROUND Liver transplantation(LT) is regarded as the best treatment for both primary and recurrent hepatocellular carcinoma(Hcc). Post-transplant Hcc recurrence rate is relatively low but significant, ranging from 10%-30% according to different series. When recurrence happens, it is usually extrahepatic and associated with poor prognosis. A predictive model that allows patient stratification according to recurrence risk can help to individualize post-transplant surveillance protocol and guidance of the use of anti-tumor immunosuppressive *** To develop a scoring system to predict Hcc recurrence after LT in an Asian *** consecutive patients having LT for Hcc from 1995 to 2016 at our hospital were recruited. They were randomized into the training set and the validation set in a60:40 ratio. Multivariable cox regression model was used to identity factors associated with Hcc recurrence. A risk score was assigned to each factor according to the odds ratio. Accuracy of the score was assessed by the area under the receiver operating characteristic *** In total, 330 patients were eligible for analysis(183 in training and 147 invalidation). Recurrent Hcc developed in 14.2% of them. The median follow-up duration was 65.6 mo. The 5-year disease-free and overall survival rates were78% and 80%, respectively. On multivariate analysis, alpha-fetoprotein > 400 ng/mL [P = 0.012, hazard ratio(HR) 2.92], sum of maximum tumor size and number(P = 0.013, HR 1.15), and salvage LT(P = 0.033, HR 2.08) were found to be independent factors for disease-free survival. A risk score was calculated for each patient with good discriminatory power(c-stat 0.748 and 0.85, respectively,in the training and validation sets). With the derived scores, patients were classified into low-(0–9), moderate-(> 9–14), and high-risk groups(> 14), and the risk of Hcc recurrence in the training and validation sets was 10%, 20%, 54%(cstat 0.67) and 4%, 22%, 62%(c-stat 0.811), accordin

关键词： Hepatocellular carcinoma Liver transplantation Post-transplant recurrence Predictive model

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Measurement of Ξcc++ production in pp collisions at s1/2=13 TeV

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chinese Physics c 2020年第2期44卷 13-23页

作者： R.Aaij c.Abellán Beteta T.Ackernley B.Adeva M.Adinolfi H.Afsharnia c.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrecht F.Alessio M.Alexander A.Alfonso Albero G.Alkhazov P.Alvarez cartelle A.A.Alves Jr S.Amato Y.Amhis L.An L.Anderlini G.Andreassi M.Andreotti F.Archilli 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 M.Bartolini F.Baryshnikov J.M.Basels G.Bassi V.Batozskaya B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel V.Belavin S.Belin V.Bellee K.Belous I.Belyaev G.Bencivenni E.Ben-Haim S.Benson S.Beranek A.Berezhnoy *** D.Berninghoff H.c.Bernstein c.Bertella E.Bertholet A.Bertolin c.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom M.S.Bieker S.Bifani P.Billoir A.Bizzeti M.Bjørn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska V.Bocci O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.V.Bowcock c.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buchanan A.Buonaura c.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.cadeddu H.cai R.calabrese L.calero Diaz S.cali R.calladine M.calvi M.calvo Gomez P.camargo Magalhaes A.camboni P.campana D.H.campora Perez A.F.campoverde Quezada L.capriotti A.carbone G.carboni R.cardinale A.cardini I.carli P.carniti K.carvalho Akiba A.casais Vidal G.casse M.cattaneo G.cavallero S.celani R.cenci J.cerasoli M.G.chapman M.charles Ph.charpentier G.chatzikonstantinidis M.chefdeville V.chekalina c.chen S.chen A.chernov S.-G.chitic V.chobanova S.cholak M.chrzaszcz A.chubykin P.ciambrone M.F.cicala X.cid Vidal G.ciezarek F.cindolo P.E.L.clarke M.clemencic H.V.cliff J.closier J.L.cobbledick V.coco J.A.B.coelho J.cogan E.cogneras L.cojocariu P.collins T.colombo A.comerma-Montells A.contu N.cooke G.coombs S.coquereau G.corti c.M.costa Sobral B.couturier D.c.craik J.crkovska A.crocombe M.cruz Torres R.currie c.L.Da Silva E.Dall'Occo J.Dalseno c.D' centro Brasileiro de Pesquisas Físicas(cBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universitéclermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di cagliari MonserratoItaly INFN Sezione di Padova PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakówPoland Nationa

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 TeV is measured in the transverse-momentum range 4c and the rapidity range2.0 详细信息

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 TeV is measured in the transverse-momentum range 4c and the rapidity range2.0correspond to an integrated luminosity of 1.7fb^-1,recorded by the LHcb experiment during *** ratio of the ■ production cross-section times the branching fraction of the■→∧^+cK^-π^+ π^+decay relative to the prompt ∧^+c production cross-section is found to be(2.22±0.27±0.29)×10^-4,assuming the central value of the measured lifetime,where the first uncertainty is statistical and the second systematic.

关键词： doubly charmed baryons hadron production QcD

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■^(−)_(b)→J/ψΛK^(−)衰变中一个J/ψΛ结构的迹象与■^(−)激发态的发现

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Science Bulletin 2021年第13期66卷 1278-1287,M0003页

作者： R.Aaij c.Abellán Beteta T.Ackernley B.Adeva M.Adinolfi H.Afsharnia c.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back S.Baker P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.c.Bernstein c.Bertella E.Bertholet A.Bertolin c.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.c.R.Bishop A.Bizzeti M.Bj┆rn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer c.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura c.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.cadeddu H.cai R.calabrese L.calefice L.calero Diaz S.cali R.calladine M.calvi M.calvo Gomez P.camargo Magalhaes A.camboni P.campana A.F.campoverde Quezada S.capelli L.capriotti A.carbone G.carboni R.cardinale A.cardini I.carli P.carniti L.carus K.carvalho Akiba A.casais Vidal G.casse M.cattaneo G.cavallero S.celani J.cerasoli A.J.chadwick M.G.chapman M.charles Ph.charpentier G.chatzikonstantinidis c.A.chavez Barajas M.chefdeville c.chen S.chen A.chernov S.-G.chitic V.chobanova S.cholak M.chrzaszcz A.chubykin V.chulikov P.ciambrone M.F.cicala X.cid Vidal G.ciezarek P.E.L.clarke M.clemencic H.V.cliff J.closier J.L.cobbledick V.coco J.A.B.coelho J.cogan E.cogneras L.cojocariu P.collins T.colombo L.congedo A.contu N.cooke G.coombs G.corti c.M.costa Sobral B.couturier D.c.craik J.crkovská M.cruz Torres R.currie c.L.Da Silva E.Dall’ centro Brasileiro de Pesquisas Físicas(cBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universitéclermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ringuet(llr) PalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-University of Science and Techno

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 fb^... 详细信息

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 fb^(−1)的质子-质子对撞数据,大型强子对撞机底夸克实验(LHcb)采用全谱分析的方法,研究了■^(−)_(b)→J/ψΛK^(−)衰变过程中的共振态结构.实验发现J/ψΛ系统中存在质量约为4.46 MeV/c^(2)的共振结构存在的迹象,其显著程度为3.1倍标准偏差,性质与五夸克态相符.这是实验上首次观测到包含奇异夸克的五夸克态的存在证据,为五夸克态的理论研究和后续的实验探索提供了重要的依据.除此之外,实验还精细测量了ΛK−系统中部分共振态的共振参数,精度远高于当前世界平均值,这对加深传统重子谱学的认识有着重要的意义.

关键词：大型强子对撞机强相互作用五夸克态共振结构奇异夸克强子组分夸克重子谱

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