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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.
- Author
- Adare A
- Afanasiev S
- Aidala C
- Ajitanand NN
- Akiba Y
- Akimoto R
- Al-Bataineh H
- Al-Jamel A
- Al-Ta'ani H
- Alexander J
- Alfred M
- Angerami A
- Aoki K
- Apadula N
- Aphecetche L
- Aramaki Y
- Armendariz R
- Aronson SH
- Asai J
- Asano H
- Aschenauer EC
- Atomssa ET
- Averbeck R
- Awes TC
- Azmoun B
- Babintsev V
- Bagoly A
- Bai M
- Baksay G
- Baksay L
- Baldisseri A
- Bannier B
- Barish KN
- Barnes PD
- Bassalleck B
- Basye AT
- Bathe S
- Batsouli S
- Baublis V
- Bauer F
- Baumann C
- Baumgart S
- Bazilevsky A
- Belikov S
- Belmont R
- Bennett R
- Berdnikov A
- Berdnikov Y
- Bhom JH
- Bickley AA
- Bjorndal MT
- Blau DS
- Boer M
- Boissevain JG
- Bok JS
- Borel H
- Boyle K
- Brooks ML
- Brown DS
- Bryslawskyj J
- Bucher D
- Buesching H
- Bumazhnov V
- Bunce G
- Burward-Hoy JM
- Butsyk S
- Camacho CM
- Campbell S
- Canoa Roman V
- Caringi A
- Castera P
- Chai J-S
- Chang BS
- Chang WC
- Charvet J-L
- Chen C-H
- Chernichenko S
- Chi CY
- Chiba J
- Chiu M
- Choi IJ
- Choi JB
- Choi S
- Choudhury RK
- Christiansen P
- Chujo T
- Chung P
- Churyn A
- Chvala O
- Cianciolo V
- Citron Z
- Cleven CR
- Cobigo Y
- Cole BA
- Comets MP
- Conesa Del Valle Z
- Connors M
- Constantin P
- Csanád M
- Csörgő T
- Publication venue
- eScholarship, University of California
- Publication date
- 01/07/2019
- Field of study
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dN_{γ}^{dir}/dη is a smooth function of dN_{ch}/dη and can be well described as proportional to (dN_{ch}/dη)^{α} with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high p_{T} (>5 GeV/c), but when results from different collision energies are compared, an additional sqrt[s_{NN}]-dependent multiplicative factor is needed to describe the integrated-direct-photon yield
First measurement of the |t|-dependence of coherent J/ψ photonuclear production
- Author
- Acharya S
- Acosta FT
- Adam J
- Adamova D
- Adler A
- Adolfsson J
- Aggarwal MM
- Agnello M
- Agrawal N
- Ahammed Z
- Ahn SU
- Aiola S
- Akindinov A
- Al-Turany M
- Alam SN
- Albuquerque DSD
- Aleksandrov D
- Alessandro B
- Alfanda HM
- Alfaro Molina R
- Ali Y
- Alici A
- Alkin A
- Alme J
- Alt T
- Altenkamper L
- Altsybeev I
- Anaam MN
- Andrei C
- Andreou D
- Andrews HA
- Andronic A
- Angeletti M
- Anguelov V
- Anson C
- Anticic T
- Antinori F
- Antonioli P
- Anwar R
- Apadula N
- Aphecetche L
- Appelshaeuser H
- Arcelli S
- Arnaldi R
- Arratia M
- Arsene IC
- Arslandok M
- Augustinus A
- Averbeck R
- Azmi MD
- Badala A
- Baek YW
- Bagnasco S
- Bailhache R
- Baillie O Villalobos
- Bala R
- Balbastre G Conesa
- Baldisseri A
- Ball M
- Baral RC
- Barbano AM
- Barbera R
- Barile F
- Barioglio L
- Barnafoeldi GG
- Barnby LS
- Barret V
- Barroso V Chibante
- Bartalini P
- Barth K
- Bartsch E
- Bastid N
- Basu S
- Batigne G
- Batyunya B
- Batzing PC
- Bazo Alba JL
- Bearden IG
- Beck H
- Bedda C
- Behera NK
- Belikov I
- Bellini F
- Bello Martinez H
- Bellwied R
- Beltran LGE
- Belyaev V
- Bencedi G
- Beole S
- Bercuci A
- Berdnikov Y
- Berenyi D
- Bertens RA
- Berzano D
- Betev L
- Bhaduri PP
- Bhasin A
- Bhat IR
- Bhatt H
- Bhattacharjee B
- Bhom J
- Bianchi A
- Bianchi L
- Bianchi N
- Bielcik J
- Bielcikova J
- Bilandzic A
- Biro G
- Biswas R
- Biswas S
- Blair JT
- Blau D
- Blume C
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- Bock F
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- Bonora M
- Borel H
- Borissov A
- Borri M
- Botta E
- Bourjau C
- Bratrud L
- Braun-Munzinger P
- Bregant M
- Broker TA
- Broz M
- Brucken EJ
- Bruna E
- Bruno GE
- Budnikov D
- Buesching H
- Bufalino S
- Buhler P
- Buncic P
- Busch O
- Bustamante RT Jimenez
- Buthelezi Z
- Butt JB
- Buxton JT
- Cabala J
- Caffarri D
- Caines H
- Caliva A
- Calvo Villar E
- Camacho RS
- Camerini P
- Capon AA
- Carena W
- Carnesecchi F
- Castellanos J Castillo
- Castro AJ
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- Chauvin A
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- Chinellato DD
- Cho S
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- Chowdhury T
- Christakoglou P
- Christensen CH
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- Chujo T
- Chung SU
- Cicalo C
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- Colamaria F
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- Cosentino MR
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- Da Costa H Pereira
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- De Souza RD
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- Degenhardt HF
- Deisting A
- del Valle Z Conesa
- Deloff A
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- Deplano C
- Dhankher P
- Di Bari D
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- Di Ruzza B
- Diaz RA
- Dietel T
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- Dupieux P
- Ehlers RJ
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- Ersdal MR
- Espagnon B
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- Faivre J
- Fantoni A
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- Figiel J
- Figueredo MAS
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- Gagliardi M
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- Gajdosova K Krizkova
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- Gallio M
- Galvan CD
- Ganoti P
- Garabatos C
- Garcia G Martinez
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- Garg K
- Gargiulo C
- Garner K
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- Gauger EF
- Gay Ducati MB
- Germain M
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- Girard M Fusco
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- Gomez Coral DM
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- Gotovac S
- Grabski V
- Graczykowski LK
- Graham KL
- Greiner L
- Grelli A
- Grigoras C
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- Jakubowska MJ
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- Jevons O
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- Jones PG
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- Kalinak P
- Kalweit A
- Kang JH
- Kaplin V
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- Karavichev O
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- Karpechev E
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- Knichel ML
- Knospe AG
- Kobdaj C
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- Konopka PJ
- Konyushikhin M
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- Kovalenko O
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- Kowalski M
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- Kravcakova A
- Kreis L
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- Kweon MJ
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- Zaccolo V
- Zaman A
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- Zanoli HJC
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- Zhang X
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- Zhang Z
- Zhao C
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- Zmeskal J
- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2021
- Field of study
The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3.
The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x.publishedVersio
Test of lepton universality in b→sℓ+ℓ− decays
- Author
- Aaij R
- Abdelmotteleb ASW
- Abellan Beteta C
- Abudinén F
- Ackernley T
- Adeva B
- Adinolfi M
- Adlarson P
- Afsharnia H
- Agapopoulou C
- Aidala CA
- Ajaltouni Z
- Akar S
- Akiba K
- Albicocco P
- Albrecht J
- Alessio F
- Alexander M
- Alfonso Albero A
- Aliouche Z
- Alvarez Cartelle P
- Amalric R
- Amato S
- Amey JL
- Amhis Y
- An L
- Anderlini L
- Andersson M
- Andreianov A
- Andreotti M
- Andreou D
- Ao D
- Archilli F
- Artamonov A
- Artuso M
- Aslanides E
- Atzeni M
- Audurier B
- Bachiller Perea I
- Bachmann S
- Bachmayer M
- Back JJ
- Bailly-Reyre A
- Baladron Rodriguez P
- Balagura V
- Baldini W
- Baptista de Souza Leite J
- Barbetti M
- Barlow RJ
- Barsuk S
- Barter W
- Bartolini M
- Baryshnikov F
- Basels JM
- Bassi G
- Batsukh B
- Battig A
- Bay A
- Beck A
- Becker M
- Bedeschi F
- Bediaga IB
- Beiter A
- Belin S
- Bellee V
- Belous K
- Belov I
- Belyaev I
- Ben-Haim E
- Benane G
- Bencivenni G
- Berezhnoy A
- Bernet Andres S
- Bernet R
- Berninghoff D
- Bernstein HC
- Bertella C
- Bertolin A
- Betancourt C
- Betti F
- Bezshyiko Ia
- Bhom J
- Bian L
- Bieker MS
- Biesuz NV
- Bifani S
- Billoir P
- Biolchini A
- Birch M
- Bishop FCR
- Bitadze A
- Bizzeti A
- Blago MP
- Blake T
- Blanc F
- Blank JE
- Blusk S
- Bobulska D
- Boelhauve JA
- Boente Garcia O
- Boettcher T
- Boldyrev A
- Bolognani CS
- Bolzonella R
- Bondar N
- Borgato F
- Borghi S
- Borsato M
- Borsuk JT
- Bouchiba SA
- Bowcock TJV
- Boyer A
- Bozzi C
- Bradley MJ
- Braun S
- Brea Rodriguez A
- Brodzicka J
- Brossa Gonzalo A
- Brown J
- Brundu D
- Buonaura A
- Buonincontri L
- Burke AT
- Burr C
- Bursche A
- Butkevich A
- Butter JS
- Buytaert J
- Byczynski W
- Cadeddu S
- Cai H
- Calabrese R
- Calefice L
- Cali S
- Calladine R
- Calvi M
- Calvo Gomez M
- Campana P
- Campora Perez DH
- Campoverde Quezada AF
- Capelli S
- Capriotti L
- Carbone A
- Cardinale R
- Cardini A
- Carniti P
- Carus L
- Casais Vidal A
- Caspary R
- Casse G
- Cattaneo M
- Cavallero G
- Cavallini V
- Celani S
- Cerasoli J
- Cervenkov D
- Chadwick AJ
- Chahrour I
- Chapman MG
- Charles M
- Charpentier Ph
- Chavez Barajas CA
- Chefdeville M
- Chen C
- Chen S
- Chernov A
- Chernyshenko S
- Chobanova V
- Cholak S
- Chrzaszcz M
- Chubykin A
- Chulikov V
- Ciambrone P
- Cicala MF
- Cid Vidal X
- Ciezarek G
- Cifra P
- Ciullo G
- Clarke PEL
- Clemencic M
- Cliff HV
- Closier J
- Cobbledick JL
- Coco V
- Cogan J
- Cogneras E
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- Congedo L
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- Corredoira I
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- Craik DC
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- d'Argent P
- Da Silva CL
- Dadabaev S
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- Dalseno J
- Daniel J
- Danilina A
- Davies JE
- Davis A
- De Aguiar Francisco O
- de Boer J
- De Bruyn K
- De Capua S
- De Cian M
- De Freitas Carneiro Da Graca U
- De Lucia E
- De Miranda JM
- De Paula L
- De Serio M
- De Simone D
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- De Vellis F
- de Vries JA
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- Hadjivasiliou C
- Haefeli G
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- Jaimes Elles SJ
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- LHCb Collaboration
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- Wislicki W
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- Wormser G
- Wotton SA
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- Wu J
- Wyllie K
- Xiang Z
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- Yeroshenko V
- Yeung H
- Yin H
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- Zavertyaev M
- Zdybal M
- Zeng M
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- Zhang S
- Zhang Y
- Zhang Y
- Zhao Y
- Zharkova A
- Zhelezov A
- Zheng Y
- Zhou T
- Zhou X
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- Zhukov V
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- Zucchelli S
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- Publication venue
- Publication date
- 18/12/2022
- Field of study
The first simultaneous test of muon-electron universality using
B+→K+ℓ+ℓ− and B0→K∗0ℓ+ℓ− decays is performed, in two ranges of the dilepton
invariant-mass squared, q2. The analysis uses beauty mesons produced in
proton-proton collisions collected with the LHCb detector between 2011 and
2018, corresponding to an integrated luminosity of 9 fb−1. Each
of the four lepton universality measurements reported is either the first in
the given q2 interval or supersedes previous LHCb measurements. The
results are compatible with the predictions of the Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-046.html (LHCb
public pages
Precision measurement of CP violation in the penguin-mediated decay Bs0→ϕϕ
- Author
- Aaij R
- Abdelmotteleb ASW
- Abellan Beteta C
- Abudinén F
- Ackernley T
- Adeva B
- Adinolfi M
- Adlarson P
- Afsharnia H
- Agapopoulou C
- Aidala CA
- Ajaltouni Z
- Akar S
- Akiba K
- Albicocco P
- Albrecht J
- Alessio F
- Alexander M
- Alfonso Albero A
- Aliouche Z
- Alvarez Cartelle P
- Amalric R
- Amato S
- Amey JL
- Amhis Y
- An L
- Anderlini L
- Andersson M
- Andreianov A
- Andreotti M
- Andreou D
- Ao D
- Archilli F
- Artamonov A
- Artuso M
- Aslanides E
- Atzeni M
- Audurier B
- Bachiller Perea IB
- Bachmann S
- Bachmayer M
- Back JJ
- Bailly-Reyre A
- Baladron Rodriguez P
- Balagura V
- Baldini W
- Baptista de Souza Leite J
- Barbetti M
- Barlow RJ
- Barsuk S
- Barter W
- Bartolini M
- Baryshnikov F
- Basels JM
- Bassi G
- Batozskaya V
- Batsukh B
- Battig A
- Bay A
- Beck A
- Becker M
- Bedeschi F
- Bediaga IB
- Beiter A
- Belin S
- Bellee V
- Belous K
- Belov I
- Belyaev I
- Ben-Haim E
- Benane G
- Bencivenni G
- Berezhnoy A
- Bernet Andres S
- Bernet R
- Berninghoff D
- Bernstein HC
- Bertella C
- Bertolin A
- Betancourt C
- Betti F
- Bezshyiko Ia
- Bhom J
- Bian L
- Bieker MS
- Biesuz NV
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- Wislicki W
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- Zunica G
- Publication venue
- Publication date
- 01/01/2023
- Field of study
A flavor-tagged time-dependent angular analysis of the decay
Bs0→ϕϕ is performed using pp collision data collected
by the LHCb experiment at % at s=13 TeV, the center-of-mass energy of
13 TeV, corresponding to an integrated luminosity of 6 fb^{-1}. The
CP-violating phase and direct CP-violation parameter are measured
to be ϕssˉs=−0.042±0.075±0.009 rad and
∣λ∣=1.004±0.030±0.009, respectively, assuming the same values
for all polarization states of the ϕϕ system. In these results, the
first uncertainties are statistical and the second systematic. These parameters
are also determined separately for each polarization state, showing no evidence
for polarization dependence. The results are combined with previous LHCb
measurements using pp collisions at center-of-mass energies of 7 and 8 TeV,
yielding ϕssˉs=−0.074±0.069 rad and ∣lambda∣=1.009±0.030. This is the most precise study of time-dependent CP violation
in a penguin-dominated B meson decay. The results are consistent with
CP symmetry and with the Standard Model predictions.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-001.html (LHCb
public pages
Measurement of the Λb0→Λ(1520)μ+μ− differential branching fraction
- Author
- Aaij R
- Abdelmotteleb ASW
- Abellan Beteta C
- Abudinén F
- Ackernley T
- Adeva B
- Adinolfi M
- Adlarson P
- Afsharnia H
- Agapopoulou C
- Aidala CA
- Ajaltouni Z
- Akar S
- Akiba K
- Albicocco P
- Albrecht J
- Alessio F
- Alexander M
- Alfonso Albero A
- Aliouche Z
- Alvarez Cartelle P
- Amalric R
- Amato S
- Amey JL
- Amhis Y
- An L
- Anderlini L
- Andersson M
- Andreianov A
- Andreotti M
- Andreou D
- Ao D
- Archilli F
- Artamonov A
- Artuso M
- Aslanides E
- Atzeni M
- Audurier B
- Bachiller Perea I
- Bachmann S
- Bachmayer M
- Back JJ
- Bailly-Reyre A
- Baladron Rodriguez P
- Balagura V
- Baldini W
- Baptista de Souza Leite J
- Barbetti M
- Barlow RJ
- Barsuk S
- Barter W
- Bartolini M
- Baryshnikov F
- Basels JM
- Bassi G
- Batsukh B
- Battig A
- Bay A
- Beck A
- Becker M
- Bedeschi F
- Bediaga IB
- Beiter A
- Belin S
- Bellee V
- Belous K
- Belov I
- Belyaev I
- Ben-Haim E
- Benane G
- Bencivenni G
- Berezhnoy A
- Bernet Andres S
- Bernet R
- Berninghoff D
- Bernstein HC
- Bertella C
- Bertolin A
- Betancourt C
- Betti F
- Bezshyiko Ia
- Bhom J
- Bian L
- Bieker MS
- Biesuz NV
- Billoir P
- Biolchini A
- Birch M
- Bishop FCR
- Bitadze A
- Bizzeti A
- Blago MP
- Blake T
- Blanc F
- Blank JE
- Blusk S
- Bobulska D
- Bocharnikov V
- Boelhauve JA
- Boente Garcia O
- Boettcher T
- Boldyrev A
- Bolognani CS
- Bolzonella R
- Bondar N
- Borgato F
- Borghi S
- Borsato M
- Borsuk JT
- Bouchiba SA
- Bowcock TJV
- Boyer A
- Bozzi C
- Bradley MJ
- Braun S
- Brea Rodriguez A
- Breer N
- Brodzicka J
- Brossa Gonzalo A
- Brown J
- Brundu D
- Buonaura A
- Buonincontri L
- Burke AT
- Burr C
- Bursche A
- Butkevich A
- Butter JS
- Buytaert J
- Byczynski W
- Cadeddu S
- Cai H
- Calabrese R
- Calefice L
- Cali S
- Calvi M
- Calvo Gomez M
- Campana P
- Campora Perez DH
- Campoverde Quezada AF
- Capelli S
- Capriotti L
- Carbone A
- Cardinale R
- Cardini A
- Carniti P
- Carus L
- Casais Vidal A
- Caspary R
- Casse G
- Cattaneo M
- Cavallero G
- Cavallini V
- Celani S
- Cerasoli J
- Cervenkov D
- Chadwick AJ
- Chahrour I
- Chapman MG
- Charles M
- Charpentier Ph
- Chavez Barajas CA
- Chefdeville M
- Chen C
- Chen S
- Chernov A
- Chernyshenko S
- Chobanova V
- Cholak S
- Chrzaszcz M
- Chubykin A
- Chulikov V
- Ciambrone P
- Cicala MF
- Cid Vidal X
- Ciezarek G
- Cifra P
- Clarke PEL
- Clemencic M
- Cliff HV
- Closier J
- Cobbledick JL
- Coco V
- Cogan J
- Cogneras E
- Cojocariu L
- Collins P
- Colombo T
- Congedo L
- Contu A
- Cooke N
- Corredoira I
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- Zuliani D
- Zunica G
- Publication venue
- Publication date
- 01/01/2023
- Field of study
The branching fraction of the rare decay Λb0→Λ(1520)μ+μ− is measured for the first time, in the squared dimuon mass
intervals, q2, excluding the J/ψ and ψ(2S) regions. The data
sample analyzed was collected by the LHCb experiment at center-of-mass energies
of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of $9\
\mathrm{fb}^{-1}.Theresultinthehighestq^{2}interval,q^{2} >15.0\
\mathrm{GeV}^2/c^4$, where theoretical predictions have the smallest model
dependence, agrees with the predictions.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-050.html (LHCb
public pages
First observation of a doubly charged tetraquark and its neutral partner
- Author
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- Abdelmotteleb ASW
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- Abudinén F
- Ackernley T
- Adeva B
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- De Lucia E
- De Miranda JM
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- Felkowski LF
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- Fernandez Gomez M
- Fernez AD
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- Ferreira Rodrigues F
- Ferreres Sole S
- Ferrillo M
- Ferro-Luzzi M
- Filippov S
- Fini RA
- Fiorini M
- Firlej M
- Fischer KM
- Fitzgerald DS
- Fitzpatrick C
- Fiutowski T
- Fleuret F
- Fontana M
- Fontanelli F
- Forty R
- Foulds-Holt D
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- Frau G
- Frei C
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- Fuehring Q
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- Zou Q
- Zucchelli S
- Zuliani D
- Zunica G
- Publication venue
- Publication date
- 01/01/2023
- Field of study
A combined amplitude analysis is performed for the decays B0→D0Ds+π− and B+→D−Ds+π+, which are
related by isospin symmetry. The analysis is based on data collected by the
LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8
and 13TeV. The full data sample corresponds to an integrated
luminosity of 9fb−1. Two new resonant states with masses of
2.908±0.011±0.020GeV and widths of
0.136±0.023±0.011GeV are observed, which decay to Ds+π+ and
Ds+π− respectively. The former state indicates the first observation of
a doubly charged open-charm tetraquark state with minimal quark content
[csˉudˉ], and the latter state is a neutral tetraquark composed of
[csˉuˉd] quarks. Both states are found to have spin-parity 0+,
and their resonant parameters are consistent with each other, which suggests
that they belong to an isospin triplet.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-026.html (LHCb
public pages
Observation of a resonant structure near the Ds+Ds− threshold in the B+→Ds+Ds−K+ decay
- Author
- Aaij R
- Abdelmotteleb ASW
- Abellan Beteta C
- Abudinén F
- Ackernley T
- Adeva B
- Adinolfi M
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- Granado Cardoso LA
- Graugés E
- Graverini E
- Graziani G
- Grecu AT
- Greeven LM
- Grieser NA
- Grillo L
- Gromov S
- Gruberg Cazon BR
- Gu C
- Guarise M
- Guittiere M
- Gushchin E
- Guth A
- Guz Y
- Gys T
- Göbel C
- Günther PA
- Hadavizadeh T
- Haefeli G
- Haen C
- Haimberger J
- Haines SC
- Halewood-Leagas T
- Halvorsen MM
- Hamilton PM
- Hammerich J
- Han Q
- Han X
- Hansen EB
- Hansmann-Menzemer S
- Hao L
- Harnew N
- Harrison T
- Hasse C
- Hatch M
- He J
- Heijhoff K
- Heinicke K
- Henderson C
- Henderson RDL
- Hennequin AM
- Hennessy K
- Henry L
- Herd JH
- Heuel J
- Hicheur A
- Hill D
- Hilton M
- Hollitt SE
- Horswill J
- Hou R
- Hou Y
- Hu J
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- Hu X
- Huang W
- Huang X
- Hulsbergen W
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- Publication venue
- Publication date
- 26/10/2022
- Field of study
An amplitude analysis of the B+→Ds+Ds−K+ decay is carried out to
study for the first time its intermediate resonant contributions, using
proton-proton collision data collected with the LHCb detector at centre-of-mass
energies of 7, 8 and 13 TeV. A near-threshold peaking structure, referred to as
X(3960), is observed in the Ds+Ds− invariant-mass spectrum with
significance greater than 12 standard deviations. The mass, width and the
quantum numbers of the structure are measured to be 3956±5±10 MeV,
43±13±8 MeV and JPC=0++, respectively, where the first
uncertainties are statistical and the second systematic. The properties of the
new structure are consistent with recent theoretical predictions for a state
composed of ccˉssˉ quarks. Evidence for an additional structure is
found around 4140 MeV in the Ds+Ds− invariant mass, which might be
caused either by a new resonance with the 0++ assignment or by a J/ψϕ↔Ds+Ds− coupled-channel effect.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-018.html (LHCb
public pages
Observation of the decay Λ <sub>b</sub> <sup>0</sup> → ψ(2S)pπ<sup>−</sup>
- Author
- Aaij R
- Adeva B
- Adinolfi M
- Aidala CA
- Ajaltouni Z
- Akar S
- Akiba K Carvalho
- Albero A Alfonso
- Albicocco P
- Albrecht J
- Alepuz C Remon
- Alessio F
- Alexander M
- Ali S
- Alkhazov G
- Altarelli M Pepe
- Amato S
- Amerio S
- Amhis Y
- An L
- Anderlini L
- Andreassi G
- Andreotti M
- Andrews JE
- Aoude R Tourinho Jadallah
- Appleby RB
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- Obraztsov V
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- Onderwater CJG
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- Rodrigues F Ferreira
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- Rotondo M
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- Salzgeber M Ravonel
- Santacesaria R
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- Santovetti E
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- Schael S
- Schellenberg M
- Schiller M
- Schindler H
- Schmelling M
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- Sciubba A
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- T'Jampens S
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- Tellarini G
- Teubert F
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- Tico J Garra
- Tilburg J van
- Tilley MJ
- Tisserand V
- Tobin M
- Tolk S
- Tomassetti L
- Tonelli D
- Torreira A Gallas
- Torres M Cruz
- Tou DY
- Tournefier E
- Traill M
- Tran MT
- Trisovic A
- Tsaregorodtsev A
- Tuci G
- Tully A
- Tuning N
- Ukleja A
- Usachov A
- Ustyuzhanin A
- Uwer U
- Vagner A
- Vagnoni V
- Valassi A
- Valat S
- Valenti G
- Vecchi S
- Veghel M van
- Velthuis JJ
- Veltri M
- Veneziano G
- Venkateswaran A
- Verlage TA
- Vernet M
- Veronesi M
- Veronika NV
- Vesterinen M
- Vidal A Romero
- Vidal F Martinez
- Vidal J Ruiz
- Vidal X Cid
- Vieira D
- Viemann H
- Vilasis-Cardona X
- Vitkovskiy A
- Vitti M
- Volkov V
- Vollhardt A
- Voneki B
- Vorobyev A
- Vorobyev V
- Vries JA de
- Waldi R
- Walsh J
- Wang J
- Wang M
- Wang Y
- Wang Z
- Ward DR
- Wark HM
- Watson NK
- Websdale D
- Weiden A
- Weisser C
- Whitehead M
- Wicht J
- Wilkinson G
- Wilkinson M
- Williams I
- Williams M
- Williams MRJ
- Williams T
- Wilson FF
- Wimberley J
- Winn M
- Wishahi J
- Wislicki W
- Witek M
- Wormser G
- Wotton SA
- Wyllie K
- Xiao D
- Xie Y
- Xu A
- Xu M
- Xu Q
- Xu Z
- Xu Z
- Yang Z
- Yang Z
- Yao Y
- Yeomans LE
- Yin H
- Yu J
- Yuan X
- Yushchenko O
- Zarebski KA
- Zavertyaev M
- Zhang D
- Zhang L
- Zhang WC
- Zhang Y
- Zhelezov A
- Zheng Y
- Zhu X
- Zhukov V
- Zonneveld JB
- Zucchelli S
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/2018
- Field of study
International audienceThe Cabibbo-suppressed decay Λb0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λb0 → ψ(2S)pK− decay mode is measured to b
Evidence for an nc(1S)ff- resonance in B0 yc(1S)K+ decays
- Author
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- Pellegrino A
- Penso G
- Pepe Altarelli M
- Perazzini S
- Pereima D
- Perret P
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- Pomery GJ
- Ponce S
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- Poslavskii S
- Potterat C
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- Prouve C
- Pugatch V
- Puig Navarro A
- Pullen H
- Punzi G
- Qian W
- Qin J
- Quagliani R
- Quintana B
- Rachwal B
- Rademacker JH
- Rama M
- RamosPernas M
- Rangel MS
- Ratnikov F
- Raven G
- Reboud M
- Redi F
- Reichert S
- Reiss F
- Remon Alepuz C
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- Renaudin V
- Ricciardi S
- Richards S
- Rinnert K
- Robbe P
- Robert A
- Rodrigues AB
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- Rodriguez Lopez JA
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- Roiser S
- Rollings A
- Romanovskiy V
- Romero Vidal A
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- Rudolph MS
- Ruf T
- Ruiz Vidal J
- Saborido Silva JJ
- Sagidova N
- Saitta B
- Salustino Guimaraes V
- Salzgeber M Ravonel
- Sanchez Gras C
- Sanchez Mayordomo C
- Sanmartin Sedes B
- Santacesaria R
- Santamarina Rios C
- Santimaria M
- Santovetti E
- Sarpis G
- Sarti A
- Satriano C
- Satta A
- Saur M
- Savrina D
- Schael S
- Schellenberg M
- Schiller M
- Schindler H
- Schmelling M
- Schmelzer T
- Schmidt B
- Schneider O
- Schopper A
- Schreiner HF
- Schubiger M
- Schune MH
- Schwemmer R
- Sciascia B
- Sciubba A
- Semennikov A
- Sepulveda ES
- Sergi A
- Serra N
- Serrano J
- Sestini L
- Seuthe A
- Seyfert P
- Shapkin M
- Shcheglov Y
- Shears T
- Shekhtman L
- Shevchenko V
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- Steinkamp O
- Stemmle S
- Stenyakin O
- Stepanova M
- Stevens H
- Stocchi A
- Stone S
- Storaci B
- Stracka S
- Stramaglia ME
- Straticiuc M
- Straumann U
- Strokov S
- Sun J
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- Swientek K
- Szabelski A
- Szumlak T
- Szymanski M
- T'Jampens S
- Tang Z
- Tayduganov A
- Tekampe T
- Tellarini G
- Teubert F
- Thomas E
- Tilley MJ
- Tisserand V
- Tobin M
- Tolk S
- Tomassetti L
- Tonelli D
- Tou DY
- Tourinho Jadallah Aoude R
- Tournefier E
- Traill M
- Tran MT
- Trisovic A
- Tsaregorodtsev A
- Tuci G
- Tully A
- Tuning N
- Ukleja A
- Usachov A
- Ustyuzhanin A
- Uwer U
- Vagner A
- Vagnoni V
- Valassi A
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- Valenti G
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- van Veghel M
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- Vecchi S
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- Veltri M
- Veneziano G
- Venkateswaran A
- Vernet M
- Veronesi M
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- Vesterinen M
- Viana Barbosa JV
- Vieira D
- Vieites Diaz M
- Viemann H
- Vilasis-Cardona X
- Vitkovskiy A
- Vitti M
- Volkov V
- Vollhardt A
- Vom Bruch D
- Voneki B
- Vorobyev A
- Vorobyev V
- Waldi R
- Walsh J
- Wang J
- Wang M
- Wang Y
- Wang Z
- Ward DR
- Wark HM
- Watson NK
- Websdale D
- Weiden A
- Weisser C
- Whitehead M
- Wicht J
- Wilkinson G
- Wilkinson M
- Williams I
- Williams M
- Williams MRJ
- Williams T
- Wilson FF
- Winn M
- Wishahi J
- Wislicki W
- Witek M
- Wormser G
- Wotton SA
- Wyllie K
- Xiao D
- Xie Y
- Xu A
- Xu M
- Xu Q
- Xu Z
- Xu Z
- Yang Z
- Yang Z
- Yao Y
- Yeomans LE
- Yin H
- Yu J
- Yuan X
- Yushchenko O
- Zarebski KA
- Zavertyaev M
- Zhang D
- Zhang L
- Zhang WC
- Zhang Y
- Zhelezov A
- Zheng Y
- Zhu X
- Zhukov V
- Zonneveld JB
- Zucchelli S
- Publication venue
- Springer Science and Business Media LLC
- Publication date
- 01/01/2018
- Field of study
A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of s=7,8 and 13TeV , corresponding to a total integrated luminosity of 4.7fb-1 . A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S)π- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20-22+18MeV and 152±58-35+60MeV , respectively. The spin-parity assignments JP=0+ and JP=1- are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π- branching fraction is performed and gives B(B0→ηc(1S)K+π-)=(5.73±0.24±0.13±0.66)×10-4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions
Search for CP violation in Λb0→pK− and Λb0→pπ− decays
- Author
- Aaij R
- Adeva B
- Adinolfi M
- Aidala Ca
- Ajaltouni Z
- Akar S
- Albicocco P
- Albrecht J
- Alessio F
- Alexander M
- Alfonso Albero A
- Ali S
- Alkhazov G
- Altarelli Mp
- Alves Jr Aa
- Amato S
- Amerio S
- Amhis Y
- An L
- Anderlini L
- Andreassi G
- Andreotti M
- Andrews Je
- Appleby Rb
- Archilli F
- Artamonov A
- Artuso M
- Arzymatov K
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- Beranek S
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- Bezshyiko I
- Bhasin S
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- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2018
- Field of study
A search for CP violation in Λb0→pK− and Λb0→pπ− decays is presented using a sample of pp collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0fb−1. The CP -violating asymmetries are measured to be ACPpK−=−0.020±0.013±0.019 and ACPpπ−=−0.035±0.017±0.020, and their difference ACPpK−−ACPpπ−=0.014±0.022±0.010, where the first uncertainties are statistical and the second systematic. These are the most precise measurements of such asymmetries to date
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