Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays
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Published:2024-06-05
Issue:6
Volume:84
Page:
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ISSN:1434-6052
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Container-title:The European Physical Journal C
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language:en
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Short-container-title:Eur. Phys. J. C
Author:
, Aaij R.ORCID, Abdelmotteleb A. S. W.ORCID, Beteta C. Abellan, Abudinén F.ORCID, Ackernley T.ORCID, Adeva B.ORCID, Adinolfi M.ORCID, Adlarson P.ORCID, Agapopoulou C.ORCID, Aidala C. A.ORCID, Ajaltouni Z., Akar S.ORCID, Akiba K.ORCID, Albicocco P.ORCID, Albrecht J.ORCID, Alessio F.ORCID, Alexander M.ORCID, Alfonso Albero A.ORCID, Aliouche Z.ORCID, Alvarez Cartelle P.ORCID, Amalric R.ORCID, Amato S.ORCID, Amey J. L.ORCID, Amhis Y.ORCID, An L.ORCID, Anderlini L.ORCID, Andersson M.ORCID, Andreianov A.ORCID, Andreola P.ORCID, Andreotti M.ORCID, Andreou D.ORCID, Anelli A.ORCID, Ao D.ORCID, Archilli F.ORCID, Argenton M.ORCID, Arguedas Cuendis S.ORCID, Artamonov A.ORCID, Artuso M.ORCID, Aslanides E.ORCID, Atzeni M.ORCID, Audurier B.ORCID, Bacher D.ORCID, Bachiller Perea I.ORCID, Bachmann S.ORCID, Bachmayer M.ORCID, Back J. J.ORCID, Baladron Rodriguez P.ORCID, Balagura V.ORCID, Baldini W.ORCID, Baptista de Souza Leite J.ORCID, Barbetti M.ORCID, Barbosa I. R.ORCID, Barlow R. 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M.ORCID, Garcia Moreno P.ORCID, García Pardiñas J.ORCID, Plana B. Garcia, Garg K. G.ORCID, Garrido L.ORCID, Gaspar C.ORCID, Geertsema R. E.ORCID, Gerken L. L.ORCID, Gersabeck E.ORCID, Gersabeck M.ORCID, Gershon T.ORCID, Ghorbanimoghaddam Z., Giambastiani L.ORCID, Giasemis F. I.ORCID, Gibson V.ORCID, Giemza H. K.ORCID, Gilman A. L.ORCID, Giovannetti M.ORCID, Gioventù A.ORCID, Gironella Gironell P.ORCID, Giugliano C.ORCID, Giza M. A.ORCID, Gkougkousis E. L.ORCID, Glaser F. C.ORCID, Gligorov V. V.ORCID, Göbel C.ORCID, Golobardes E.ORCID, Golubkov D.ORCID, Golutvin A.ORCID, Gomes A.ORCID, Gomez Fernandez S.ORCID, Goncalves Abrantes F.ORCID, Goncerz M.ORCID, Gong G.ORCID, Gooding J. A.ORCID, Gorelov I. V.ORCID, Gotti C.ORCID, Grabowski J. P.ORCID, Granado Cardoso L. A.ORCID, Graugés E.ORCID, Graverini E.ORCID, Grazette L.ORCID, Graziani G.ORCID, Grecu A. T.ORCID, Greeven L. M.ORCID, Grieser N. 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M.ORCID, Nikitin N.ORCID, Nogga P., Nolte N. S.ORCID, Normand C.ORCID, Novoa Fernandez J.ORCID, Nowak G.ORCID, Nunez C.ORCID, Nur H. N.ORCID, Oblakowska-Mucha A.ORCID, Obraztsov V.ORCID, Oeser T.ORCID, Okamura S.ORCID, Oldeman R.ORCID, Oliva F.ORCID, Olocco M.ORCID, Onderwater C. J. G.ORCID, O’Neil R. H.ORCID, Goicochea J. M. OtaloraORCID, Ovsiannikova T.ORCID, Owen P.ORCID, Oyanguren A.ORCID, Ozcelik O.ORCID, Padeken K. O.ORCID, Pagare B.ORCID, Pais P. R.ORCID, Pajero T.ORCID, Palano A.ORCID, Palutan M.ORCID, Panshin G.ORCID, Paolucci L.ORCID, Papanestis A.ORCID, Pappagallo M.ORCID, Pappalardo L. L.ORCID, Pappenheimer C.ORCID, Parkes C.ORCID, Passalacqua B.ORCID, Passaleva G.ORCID, Passaro D.ORCID, Pastore A.ORCID, Patel M.ORCID, Patoc J.ORCID, Patrignani C.ORCID, Pawley C. 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Abstract
AbstractThe decays $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$
Λ
b
0
→
Λ
c
+
D
¯
(
∗
)
0
K
-
and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$
Λ
b
0
→
Λ
c
+
D
s
∗
-
are observed for the first time, in proton-proton collision data at $$\sqrt{s} =13\text {Te\hspace{-1.00006pt}V} $$
s
=
13
Te
V
, corresponding to an integrated luminosity of 5.4$$\text {fb} ^{-1}$$
fb
-
1
collected with the LHCb detector. Their ratios of branching fractions with respect to the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} $$
Λ
b
0
→
Λ
c
+
D
s
-
mode are measured to be $$\begin{aligned} \begin{aligned} \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{*0}} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 1.668 \pm 0.022 {}_{-0.055}^{+0.061}, \end{aligned} \end{aligned}$$
B
Λ
b
0
→
Λ
c
+
D
¯
0
K
-
B
Λ
b
0
→
Λ
c
+
D
s
-
=
0.1908
-
0.0034
+
0.0036
-
0.0018
+
0.0016
±
0.0038
,
B
Λ
b
0
→
Λ
c
+
D
¯
∗
0
K
-
B
Λ
b
0
→
Λ
c
+
D
s
-
=
0.589
-
0.017
+
0.018
-
0.018
+
0.017
±
0.012
,
B
Λ
b
0
→
Λ
c
+
D
s
∗
-
B
Λ
b
0
→
Λ
c
+
D
s
-
=
1.668
±
0.022
-
0.055
+
0.061
,
where the first uncertainties are statistical, the second systematic, and the third, for the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$
Λ
b
0
→
Λ
c
+
D
¯
(
∗
)
0
K
-
decays, are due to the uncertainties on the branching fractions of the $${{D} ^-_{s}} \!\rightarrow {{K} ^-} {{K} ^+} {{\pi } ^-} $$
D
s
-
→
K
-
K
+
π
-
and $${{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} \!\rightarrow {{K} ^+} {{\pi } ^-} $$
D
¯
0
→
K
+
π
-
decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$
Λ
b
0
→
Λ
c
+
D
¯
(
∗
)
0
K
-
decay channels.
Publisher
Springer Science and Business Media LLC
Reference75 articles.
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