131 research outputs found
A reactivity-selectivity study of the Friedel-Crafts acetylation of 3,3′-dimethylbiphenyl and the oxidation of the acetyl derivatives
- Author
- A Ehmer
- A Modelli
- A Shiotani
- AD Andreou
- AD Andreou
- AV Tobolsky
- D Dowdy
- F Effenberger
- F Perin
- Fadhil S Kamounah
- FS Kamounah
- FS Kamounah
- G Sartori
- G Sartori
- GA Olah
- GA Olah
- GA Olah
- H Heaney
- Hanna S Abbo
- HC Brown
- HO Wirth
- IL Kotlyarevskii
- J Al-Ka’bi
- J-H Kim
- JB Shoesmith
- JH Clark
- JIG Cadogan
- JJ Dynes
- JP Maier
- JW Cook
- KJ Wallace
- L Kurti
- L Levy
- L Meneses
- LK Tan
- LK Tan
- LM Jackman
- M Kettunen
- M Minabe
- MG Davlieva
- MI Dovgosheya
- MJ Frisch
- N Kornblum
- Ole Hammerich
- P Fiedler
- PBD de la Mare
- PH Gore
- PH Gore
- PH Gore
- PH Gore
- RB Bates
- RB Girdler
- RMG Roberts
- S Boehm
- S Csihony
- S Yamabe
- Salam JJ Titinchi
- SJJ Titinchi
- SJJ Titinchi
- T Mala’bi
- TA Kortekaas
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/2012
- Field of study
<p>Abstract</p> <p>Background</p> <p>Friedel-Crafts acetylation is an important route to aromatic ketones, in research laboratories and in industry. The acetyl derivatives of 3,3′-dimethylbiphenyl (3,3′-dmbp) have applications in the field of liquid crystals and polymers and may be oxidized to the dicarboxylic acids and derivatives that are of interest in cancer treatment.</p> <p>Findings</p> <p>The effect of solvent and temperature on the selectivity of monoacetylation of 3,3’-dmbp by the Perrier addition procedure was studied using stoichiometric amounts of reagents. 4-Ac-3,3′-dmbp was formed almost quantitatively in boiling 1,2-dichloroethane and this is almost twice the yield hitherto reported. Using instead a molar ratio of substrate:AcCl:AlCl<sub>3</sub> equal to 1:4:4 or 1:6:6 in boiling 1,2-dichloroethane, acetylation afforded 4,4′- and 4,6′-diacetyl-3,3′-dmbp in a total yield close to 100%. The acetyl derivatives were subsequently converted to the carboxylic acids by hypochlorite oxidation. The relative stabilities of the isomeric products and the corresponding σ-complexes were studied by DFT calculations and the data indicated that mono- and diacetylation followed different mechanisms.</p> <p>Conclusions</p> <p>Friedel-Crafts acetylation of 3,3′-dmbp using the Perrier addition procedure in boiling 1,2-dichloroethane was found to be superior to other recipes. The discrimination against the 6-acetyl derivative during monoacetylation seems to reflect a mechanism including an AcCl:AlCl<sub>3</sub> complex or larger agglomerates as the electrophile, whereas the less selective diacetylations of the deactivated 4-Ac-3,3′-dmbp are suggested to include the acetyl cation as the electrophile. The DFT data also showed that complexation of intermediates and products with AlCl<sub>3</sub> does not seem to be important in determining the mechanism.</p
Observation and branching fraction measurement of the decay Ξb- → Λ0 bπ -
- Author
- Aaij R
- Abdelmotteleb ASW
- Abellan Beteta C
- Abudinen F
- Ackernley T
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- 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
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- Amato S
- Amey JL
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- Anderlini L
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- Zhovkovska V
- Zhu LZ
- Zhu X
- Zhu Z
- Zhukov V
- Zhuo J
- Zou Q
- Zucchelli S
- Zuliani D
- Zunica G
- Publication venue
- Publication date
- 01/01/2023
- Field of study
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
- 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 VB
- 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 IC
- 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
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- Congedo L
- Contu A
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- Corredoira I
- Corti G
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- Craik DC
- Cruz Torres M
- Currie R
- D'Ambrosio C
- d'Argent P
- Da Silva CL
- Dadabaev S
- Dai L
- Dai X
- Dall'Occo E
- 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
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- Dobishuk V
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- Dong C
- Donohoe AM
- Dordei F
- Dos Reis AC
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- Downes AG
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- Dudek MW
- Dufour L
- Duk V
- Durante P
- Duras MM
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- Dutta D
- Dziurda A
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- Egede U
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- Jage H
- Jaimes Elles SJ
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- Jashal BK
- Jawahery A
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- Konoplyannikov A
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- Kostiuk I
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- Le Gac R
- Lee SH
- Leflat A
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- Legotin S
- Leroy O
- Lesiak T
- Leverington B
- LHCb Collaboration
- Li A
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- Lin C
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- Westhenry BDC
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- Zdybal M
- Zeng M
- Zhang C
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- Zhang JZ
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- Zhang S
- Zhang Y
- Zhang Y
- Zhao Y
- Zharkova A
- Zhelezov A
- Zheng Y
- Zhou T
- Zhou X
- Zhou Y
- Zhovkovska V
- Zhu X
- Zhu X
- Zhu Z
- Zhukov V
- Zhuo J
- Zou Q
- Zucchelli S
- Zuliani D
- 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
Observation of Two New Excited Ξb0 States Decaying to Λb0 K-π+
- Author
- Aaij R
- Abdelmotteleb ASW
- Abrantes FG
- Ackernley T
- Adeva B
- Adinolfi M
- Afsharnia H
- Agapopoulou C
- Aidala CA
- Aiola S
- Ajaltouni Z
- Akar S
- Akiba KC
- Albero AA
- Albrecht J
- Alepuz CR
- Alessio F
- Alexander M
- Aliouche Z
- Alkhazov G
- Altarelli MP
- Amato S
- Amey JL
- 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 JJ
- Balagura V
- Baldini W
- Barajas CAC
- Barbetti M
- Barlow RJ
- Barsuk S
- Barter W
- Bartolini M
- Baryshnikov F
- Basels JM
- 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
- Ben-Haim E
- Bencivenni G
- Benito CM
- Berezhnoy A
- Bernet R
- Berninghoff D
- Bernstein HC
- Bertella C
- Bertolin A
- Betancourt C
- Beteta CA
- Betti F
- Bezshyiko I
- Bhasin S
- Bhom J
- Bian L
- Bieker MS
- Bifani S
- Billoir P
- Birch M
- Bishop FCR
- Bitadze A
- Bizzeti A
- Bjorn M
- Blago MP
- Blake T
- Blanc F
- Blusk S
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- Zonneveld JB
- Zou Q
- Zucchelli S
- Zuliani D
- Zunica G
- Publication venue
- 'American Physical Society (APS)'
- Publication date
- 01/01/2022
- Field of study
Two narrow resonant states are observed in the Λb0K-π+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb-1. The minimal quark content of the Λb0K-π+ system indicates that these are excited Ξb0 baryons. The masses of the Ξb(6327)0 and Ξb(6333)0 states are m[Ξb(6327)0]=6327.28-0.21+0.23±0.12±0.24 and m[Ξb(6333)0]=6332.69-0.18+0.17±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41-0.27+0.26±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λb0 mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξb(6327)0]<2.20(2.56) and Γ[Ξb(6333)0]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξb0 resonances
Measurement of the Λb0→Λ(1520)μ+μ− differential branching fraction
- Author
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- 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
Modification of χc1(3872) and ψ(2S) production in pPb collisions at √sNN = 8.16 TeV
- Author
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- Golubkov D
- Golutvin A
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- Goncerz M
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- Idzik M
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- Ilten P
- Inglessi A
- Iniukhin A
- Ishteev A
- Ivshin K
- Jacobsson R
- Jage H
- Jaimes Elles SJ
- Jakobsen S
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- Jevtic V
- Jiang E
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- John M
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- Juszczak I
- Kaminaris D
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- Kang Y
- Karacson M
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- Yeung H
- Yin H
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- Zavertyaev M
- Zdybal M
- Zeng M
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- Zhang YZ
- Zhao Y
- Zharkova A
- Zhelezov A
- Zheng XZ
- Zheng Y
- Zhou T
- Zhou X
- Zhou Y
- Zhovkovska V
- Zhu LZ
- Zhu X
- Zhu X
- Zhu Z
- Zhukov V
- Zhuo J
- Zou Q
- Zuliani D
- Zunica G
- Publication venue
- American Physical Society
- Publication date
- 01/01/2024
- Field of study
The LHCb Collaboration measures production of the exotic hadron χc1(3872) in proton-nucleus collisions for the first time. Comparison with the charmonium state ψ(2S) suggests that the exotic χc1(3872) experiences different dynamics in the nuclear medium than conventional hadrons, and comparison with data from proton-proton collisions indicates that the presence of the nucleus may modify χc1(3872) production rates. This is the first measurement of the nuclear modification factor of an exotic hadron
Improved measurement of CP violation parameters in Bs0→J/ψK+K− decays in the vicinity of the ϕ(1020) resonance
- Author
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- Gorelov IV
- Gotti C
- Grabowski JP
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- Graugés E
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- Grazette L
- Graziani G
- Grecu AT
- Greeven LM
- Grieser NA
- Grillo L
- Gromov S
- Gu C
- Guarise M
- Guittiere M
- Guliaeva V
- Guseinov AK
- Gushchin E
- Guz Y
- Gys T
- Göbel C
- Günther PA
- Hadavizadeh T
- Hadjivasiliou C
- Haefeli G
- Haen C
- Haimberger J
- Haines SC
- Hajheidari M
- Halewood-Leagas T
- Halvorsen MM
- Hamilton PM
- Hammerich J
- Han Q
- Han X
- Hansmann-Menzemer S
- Hao L
- Harnew N
- Harrison T
- Hartmann M
- Hasse C
- Hatch M
- He J
- Heijhoff K
- Hemmer F
- Henderson C
- Henderson RDL
- Hennequin AM
- Hennessy K
- Henry L
- Herd J
- Heuel J
- Hicheur A
- Hill D
- Hilton M
- Hollitt SE
- Horswill J
- Hou R
- Hou Y
- Howarth N
- Hu J
- Hu J
- Hu W
- Hu X
- Huang W
- Huang X
- Hulsbergen W
- Hunter RJ
- Hushchyn M
- Hutchcroft D
- Ibis P
- Idzik M
- Ilin D
- Ilten P
- Inglessi A
- Iniukhin A
- Ishteev A
- Ivshin K
- Jacobsson R
- Jage H
- Jaimes Elles SJ
- Jakobsen S
- Jans E
- Jashal BK
- Jawahery A
- Jevtic V
- Jiang E
- Jiang X
- Jiang Y
- Jiang YJ
- John M
- Johnson D
- Jones CR
- Jones TP
- Joshi S
- Jost B
- Jurik N
- Juszczak I
- Kaminaris D
- Kandybei S
- Kang Y
- Karacson M
- Karpenkov D
- Karpov M
- Kauniskangas AM
- Kautz JW
- Keizer F
- Keller DM
- Kenzie M
- Ketel T
- Khanji B
- Kharisova A
- Kholodenko S
- Khreich G
- Kirn T
- Kirsebom VS
- Kitouni O
- Klaver S
- Kleijne N
- Klimaszewski K
- Kmiec MR
- Koliiev S
- Kolk L
- Konoplyannikov A
- Kopciewicz P
- Kopecna R
- Koppenburg P
- Korolev M
- Kostiuk I
- Kot O
- Kotriakhova S
- Kozachuk A
- Kravchenko P
- Kravchuk L
- Kreps M
- Kretzschmar S
- Krokovny P
- Krupa W
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- Leflat A
- Lefèvre R
- Legotin S
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- Leverington B
- LHCb Collaboration
- Li A
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- Wyllie K
- Xian S
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- Xu Z
- Xu Z
- Yang D
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- Yang Z
- Yeroshenko V
- Yeung H
- Yin H
- Yu CY
- Yu J
- Yuan X
- Zaffaroni E
- Zavertyaev M
- Zdybal M
- Zeng M
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- Zhang Y
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- Zhelezov A
- Zheng Y
- Zhou T
- Zhou X
- Zhou Y
- Zhovkovska V
- Zhu LZ
- Zhu X
- Zhu X
- Zhu Z
- Zhukov V
- Zhuo J
- Zou Q
- Zucchelli S
- Zuliani D
- Zunica G
- Publication venue
- American Physical Society
- Publication date
- 01/01/2024
- Field of study
The decay-time-dependent
C
P
asymmetry in
B
0
s
→
J
/
ψ
(
→
μ
+
μ
−
)
K
+
K
−
decays is measured using proton-proton collision data, corresponding to an integrated luminosity of
6
fb
−
1
, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000
B
0
s
signal decays with an invariant
K
+
K
−
mass in the vicinity of the
ϕ
(
1020
)
resonance, the
C
P
-violating phase
ϕ
s
is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the
B
0
s
−
¯
B
0
s
system,
Δ
Γ
s
, and the difference of the average
B
0
s
and
B
0
meson decay widths,
Γ
s
−
Γ
d
. The values obtained are
ϕ
s
=
−
0.039
±
0.022
±
0.006
rad
,
Δ
Γ
s
=
0.0845
±
0.0044
±
0.0024
ps
−
1
, and
Γ
s
−
Γ
d
=
−
0.005
6
+
0.0013
−
0.0015
±
0.0014
ps
−
1
, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase
ϕ
s
is also measured independently for each polarization state of the
K
+
K
−
system and shows no evidence for polarization dependence
Measurements of the branching fraction ratio B(ϕ → μ+μ−) / B(ϕ → e+e−) with charm meson decays
- Author
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- Abudinén F
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- Giambastiani L
- Giasemis FI
- Gibson V
- Giemza HK
- Gilman AL
- Giovannetti M
- Gioventù A
- Gironella Gironell P
- Giugliano C
- Giza MA
- Gkougkousis EL
- Glaser FC
- Gligorov VV
- Golobardes E
- Golubkov D
- Golutvin A
- Gomes A
- Gomez Fernandez S
- Goncalves Abrantes F
- Goncerz M
- Gong G
- Gooding JA
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- Gotti C
- Grabowski JP
- Granado Cardoso LA
- Graugés E
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- Grazette L
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- Greeven LM
- Grieser NA
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- Gu C
- Guarise M
- Guittiere M
- Guliaeva V
- Guseinov A-K
- Gushchin E
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- Keller DM
- Kenzie M
- Ketel T
- Khanji B
- Kharisova A
- Kholodenko S
- Khreich G
- Kirn T
- Kirsebom VS
- Kitouni O
- Klaver S
- Kleijne N
- Klimaszewski K
- Kmiec MR
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- Kolk L
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- Zhelezov A
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- Zhukov V
- Zhuo J
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- Zuliani D
- Zunica G
- Publication venue
- Springer
- Publication date
- 01/05/2024
- Field of study
Measurements of the branching fraction ratio B(ϕ → μ+μ−) / B(ϕ → e+e−) with Ds+→π+ϕ and D+→ π+ϕ decays, denoted Rϕπs and Rϕπd, are presented. The analysis is performed using a dataset corresponding to an integrated luminosity of 5.4 fb−1 of pp collision data collected with the LHCb experiment. The branching fractions are normalised with respect to the B+ → K+J/ψ(→ e+e−) and B+ → K+J/ψ(→ μ+μ−) decay modes. The combination of the results yieldsRϕπ=1.022±0.012stat±0.048syst. The result is compatible with previous measurements of the ϕ → ℓ+ℓ− branching fractions and predictions based on the Standard Model
Amplitude analysis of the B0→K*0μ+μ− decay
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- LHCb Collaboration
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- Lynch K
- Lyu X-R
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- Wislicki W
- Witek M
- Witola L
- Wong CP
- Wormser G
- Wotton SA
- Wu H
- Wu J
- Wu Y
- Wyllie K
- Xian S
- Xiang Z
- Xie Y
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- Xu J
- Xu L
- Xu L
- Xu M
- Xu Z
- Xu Z
- Xu Z
- Yang D
- Yang S
- Yang X
- Yang Y
- Yang Z
- Yang Z
- Yeroshenko V
- Yeung H
- Yin H
- Yu CY
- Yu J
- Yuan X
- Zaffaroni E
- Zavertyaev M
- Zdybal M
- Zeng M
- Zhang C
- Zhang D
- Zhang J
- Zhang L
- Zhang S
- Zhang S
- Zhang Y
- Zhang Y
- Zhang YZ
- Zhao Y
- Zharkova A
- Zhelezov A
- Zheng XZ
- Zheng Y
- Zhou T
- Zhou X
- Zhou Y
- Zhovkovska V
- Zhu LZ
- Zhu X
- Zhu X
- Zhu Z
- Zhukov V
- Zhuo J
- Zou Q
- Zuliani D
- Zunica G
- Publication venue
- American Physical Society
- Publication date
- 01/01/2024
- Field of study
An amplitude analysis of the
B
0
→
K
*
0
μ
+
μ
−
decay is presented using a dataset corresponding to an integrated luminosity of
4.7
fb
−
1
of
p
p
collision data collected with the LHCb experiment. For the first time, the coefficients associated to short-distance physics effects, sensitive to processes beyond the standard model, are extracted directly from the data through a
q
2
-unbinned amplitude analysis, where
q
2
is the
μ
+
μ
−
invariant mass squared. Long-distance contributions, which originate from nonfactorizable QCD processes, are systematically investigated, and the most accurate assessment to date of their impact on the physical observables is obtained. The pattern of measured corrections to the short-distance couplings is found to be consistent with previous analyses of
b
- to
s
-quark transitions, with the largest discrepancy from the standard model predictions found to be at the level of 1.8 standard deviations. The global significance of the observed differences in the decay is 1.4 standard deviations
Enhanced production of Λb0 baryons in high-multiplicity pp collisions at √s = 13 TeV
- Author
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- Magdalinski D
- Maisuzenko D
- Majewski MW
- Malczewski JJ
- Malde S
- Malecki B
- Malentacca L
- Malinin A
- Maltsev T
- Manca G
- Mancinelli G
- Mancuso C
- Manera Escalero R
- Manuzzi D
- Marangotto D
- Marchand JF
- Marchevski R
- Marconi U
- Mariani S
- Marin Benito C
- Marks J
- Marshall AM
- Marshall PJ
- Martelli G
- Martellotti G
- Martinazzoli L
- Martinelli M
- Martinez Santos D
- Martinez Vidal F
- Massafferri A
- Materok M
- Matev R
- Mathad A
- Matiunin V
- Matteuzzi C
- Mattioli KR
- Mauri A
- Maurice E
- Mauricio J
- Mayencourt P
- Mazurek M
- McCann M
- Mcconnell L
- McGrath TH
- McHugh NT
- McNab A
- McNulty R
- Meadows B
- Meier G
- Melnychuk D
- Merk M
- Merli A
- Meyer Garcia L
- Miao D
- Miao H
- Mikhasenko M
- Milanes DA
- Minotti A
- Minucci E
- Miralles T
- Mitchell SE
- Mitreska B
- Mitzel DS
- Modak A
- Mohammed RA
- Moise RD
- Mokhnenko S
- Mombächer T
- Monk M
- Monroy IA
- Monteil S
- Morcillo Gomez A
- Morello G
- Morello MJ
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- Wyllie K
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- Yeroshenko V
- Yeung H
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- Zaffaroni E
- Zavertyaev M
- Zdybal M
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- Zhao Y
- Zharkova A
- Zhelezov A
- Zheng XZ
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- Zhovkovska V
- Zhu LZ
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- Zhukov V
- Zhuo J
- Zou Q
- Zuliani D
- Zunica G
- Publication venue
- American Physical Society
- Publication date
- 01/01/2024
- Field of study
The production rate of
Λ
0
b
baryons relative to
B
0
mesons in
p
p
collisions at a center-of-mass energy
√
s
=
13
TeV
is measured by the LHCb experiment. The ratio of
Λ
0
b
to
B
0
production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in
e
+
e
−
collisions, and increases by a factor of
∼
2
with increasing multiplicity. At relatively low transverse momentum, the ratio of
Λ
0
b
to
B
0
cross sections is higher than what is measured in
e
+
e
−
collisions, but converges with the
e
+
e
−
ratio as the momentum increases. These results imply that the evolution of heavy
b
quarks into final-state hadrons is influenced by the density of the hadronic environment produced in the collision. Comparisons with several models and implications for the mechanisms enforcing quark confinement are discussed
- …