Natural Language Processing (NLP) is a branch of Artificial Intelligence (AI). It is a study of how machines understand the language of humans. It aims to build systems that can understand text and ...perform tasks like language translation and classifying a topic. NLP has manyapplications. NLP tools help to process unstructured data. Question Answering (QA) system or information retrieval system falls under the category of NLP. The QA system mainly involves two methods, question analysis and answer extraction. Intelligent QA systems have always outperformed the non-intelligent QA systems. It is a neural network that is incorporated with the QA system to make it intelligent. Neural networks(NN) are a series of algorithms that are used to mimic the operations of a human brain to understand the relationships between data. NN can learn by themselves and produce the output that is not limited to the input provided to them.
Abstract
The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between ...primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5
$$\,\text {Te\hspace{-1.00006pt}V}$$
Te
V
incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and
$$110\,\text {Ge\hspace{-1.00006pt}V\!/}c $$
110
Ge
V\!/
c
. The dominant antihyperon contribution, namely
$${\overline{\varLambda }} \rightarrow {\overline{{p}}} {{\pi } ^+} $$
Λ
¯
→
p
¯
π
+
decays from promptly produced
$$\overline{\varLambda }$$
Λ
¯
particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A
bstract
The polarimeter vector field for multibody decays of a spin-half baryon is introduced as a generalisation of the baryon asymmetry parameters. Using a recent amplitude analysis of the
$$ ...{\Lambda}_c^{+} $$
Λ
c
+
→
pK
−
π
+
decay performed at the LHCb experiment, we compute the distribution of the kinematic-dependent polarimeter vector for this process in the space of Mandelstam variables to express the polarised decay rate in a model-agnostic form. The obtained representation can facilitate polarisation measurements of the
$$ {\Lambda}_c^{+} $$
Λ
c
+
baryon and eases inclusion of the
$$ {\Lambda}_c^{+} $$
Λ
c
+
→ pK
−
π
+
decay mode in hadronic amplitude analyses.
Evidence for the decay X ( 3872 ) → J / ψ ω Poireau, V.; Hooberman, B.; Kerth, L. T. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
07/2010, Letnik:
82, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We present a study of the decays B^{0,+} --> J/psi pi^+ pi^- pi^0 K^{0,+}, using 467 10^6 BBbar pairs recorded with the BABAR detector. We present evidence for the decay mode X(3872) --> J/psi omega, ...with product branching fractions B(B^+ --> X(3872)K^+) B(X(3872) --> J/psi omega) =0.6\pm0.2\stat \pm 0.1\syst 10^{-5}, and B(B^0 --> X(3872)K^0) B(X(3872) --> J/psi omega) =0.6\pm0.3\stat \pm 0.1\syst 10^{-5}. A detailed study of the pi^+ pi^- pi^0 mass distribution from X(3872) decay favors a negative-parity assignment.
A
bstract
Four decay modes of the
$$ {B}_c^{+} $$
B
c
+
meson into a
J/ψ
meson and multiple charged kaons or pions are studied using proton-proton collision data, collected with the LHCb detector at ...centre-of-mass energies of 7, 8, and 13 TeV and corresponding to an integrated luminosity of 9 fb
−
1
. The decay
$$ {B}_c^{+} $$
B
c
+
→ J/ψK
+
K
−
π
+
π
+
π
−
is observed for the first time, and evidence for the
$$ {B}_c^{+} $$
B
c
+
→ J/ψ
4
π
+
3
π
−
decay is found. The decay
$$ {B}_c^{+} $$
B
c
+
→ J/ψ
3
π
+
2
π
−
is observed and the previous observation of the
$$ {B}_c^{+} $$
B
c
+
→ ψ
(2
S
)
π
+
π
+
π
−
decay is confirmed using the
ψ
(2
S
) →
J/ψπ
+
π
−
decay mode. Ratios of the branching fractions of these four
$$ {B}_c^{+} $$
B
c
+
decay channels are measured.
We study the process $e^+e^-\to J/\psi\pi^{+}\pi^{-}$ with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BaBar detector at ...center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454 $\mathrm{fb^{-1}}$. We investigate the $J/\psi \pi^{+}\pi^{-}$ mass distribution in the region from 3.5 to 5.5 $\mathrm{GeV/c^{2}}$. Below 3.7 $\mathrm{GeV/c^{2}}$ the $\psi(2S)$ signal dominates, and above 4 $\mathrm{GeV/c^{2}}$ there is a significant peak due to the Y(4260). A fit to the data in the range 3.74 -- 5.50 $\mathrm{GeV/c^{2}}$ yields a mass value $4244 \pm 5$ (stat) $ \pm 4$ (syst)$\mathrm{MeV/c^{2}}$ and a width value $114 ^{+16}_{-15}$ (stat)$ \pm 7$(syst)$\mathrm{MeV}$ for this state. We do not confirm the report from the Belle collaboration of a broad structure at 4.01 $\mathrm{GeV/c^{2}}$. In addition, we investigate the $\pi^{+}\pi^{-}$ system which results from Y(4260) decay.
A
bstract
The first observation of the
$$ {\Lambda}_b^0\to {D}_s^{-}p $$
Λ
b
0
→
D
s
−
p
decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass ...energy of
$$ \sqrt{s} $$
s
= 13 TeV, corresponding to a total integrated luminosity of 6 fb
−
1
. Using the
$$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} $$
Λ
b
0
→
Λ
c
+
π
−
decay as the normalisation mode, the branching fraction of the
$$ {\Lambda}_b^0\to {D}_s^{-}p $$
Λ
b
0
→
D
s
−
p
decay is measured to be
$$ \mathcal{B}\left({\Lambda}_b^0\to {D}_s^{-}p\right)=\left(12.6\pm 0.5\pm 0.3\pm 1.2\right)\times {10}^{-6} $$
B
Λ
b
0
→
D
s
−
p
=
12.6
±
0.5
±
0.3
±
1.2
×
10
−
6
, where the first uncertainty is statistical, the second systematic and the third due to uncertainties in the branching fractions of the
$$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} $$
Λ
b
0
→
Λ
c
+
π
−
,
$$ {D}_s^{-}\to {K}^{-}{K}^{+}{\pi}^{-} $$
D
s
−
→
K
−
K
+
π
−
and
$$ {\Lambda}_c^{+}\to p{K}^{-}{\pi}^{+} $$
Λ
c
+
→
p
K
−
π
+
decays.
A
bstract
The ratio of branching fractions of
$$ {B}_c^{+}\to {B}_s^0{\pi}^{+} $$
B
c
+
→
B
s
0
π
+
and
$$ {B}_c^{+}\to J/\psi {\pi}^{+} $$
B
c
+
→
J
/
ψ
π
+
decays is measured with proton-proton ...collision data of a centre-of-mass energy of 13 TeV. The data were collected with the LHCb experiment during 2016–2018, corresponding to an integrated luminosity of 5
.
4 fb
−
1
. The
$$ {B}_s^0 $$
B
s
0
mesons are reconstructed via the decays
$$ {B}_s^0\to J/\psi \phi $$
B
s
0
→
J
/
ψϕ
and
$$ {B}_s^0\to {D}_s^{-}{\pi}^{+} $$
B
s
0
→
D
s
−
π
+
. The ratio of branching fractions is measured to be
$$ \mathcal{B}\left({B}_c^{+}\to {B}_s^0{\pi}^{+}\right)/\mathcal{B}\left({B}_c^{+}\to J/\psi {\pi}^{+}\right)=91\pm 10\pm 8\pm 3 $$
B
B
c
+
→
B
s
0
π
+
/
B
B
c
+
→
J
/
ψ
π
+
=
91
±
10
±
8
±
3
where the first uncertainty is statistical, the second is systematic and the third is due to the knowledge of the branching fractions of the intermediate state decays.
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