Search for the doubly charmed baryon $$ {\varXi}_{cc}^{+} $$ in the $$ {\varXi}_c^{+}{\pi}^{-}{\pi}^{+} $$ final state

Author:

,Aaij R.,Abdelmotteleb A. S. W.,Abellán Beteta C.,Ackernley T.,Adeva B.,Adinolfi M.,Afsharnia H.,Agapopoulou C.,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.,Barbetti M.,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.,Buonincontri L.,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.,Cervenkov D.,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.,Dedu V.,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. 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Abstract

Abstract A search for the doubly charmed baryon $$ {\varXi}_{cc}^{+} $$ Ξ cc + is performed in the $$ {\varXi}_c^{+}{\pi}^{-}{\pi}^{+} $$ Ξ c + π π + invariant-mass spectrum, where the $$ {\varXi}_c^{+} $$ Ξ c + baryon is reconstructed in the pKπ+ final state. The study uses proton-proton collision data collected with the LHCb detector at a centre- of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 5.4 fb1. No significant signal is observed in the invariant-mass range of 3.4–3.8 GeV/c2. Upper limits are set on the ratio of branching fractions multiplied by the production cross-section with respect to the $$ {\varXi}_{cc}^{++} $$ Ξ cc + + ($$ {\varXi}_c^{+} $$ Ξ c + → pKπ+)π+ decay for different $$ {\varXi}_{cc}^{+} $$ Ξ cc + mass and lifetime hypotheses in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2.5 to 25 GeV/c. The results from this search are combined with a previously published search for the $$ {\varXi}_{cc}^{+} $$ Ξ cc + $$ {\varLambda}_c^{+} $$ Λ c + Kπ+ decay mode, yielding a maximum local significance of 4.0 standard deviations around the mass of 3620 MeV/c2, including systematic uncertainties. Taking into account the look-elsewhere effect in the 3.5–3.7 GeV/c2 mass window, the combined global significance is 2.9 standard deviations including systematic uncertainties.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Reference95 articles.

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