From Wikipedia, the free encyclopedia
The Y(4140)
particle is an electrically neutral
exotic hadron candidate that is about 4.4 times heavier than the
proton . It was observed at
Fermilab and announced on 17 March 2009.
[1] This particle is extremely rare and was detected in only 20 of billions of collisions.
[2]
Since it decays into
J/ψ and
φ
mesons , it has been suggested that this particle is composed of
charm quarks and charm antiquarks, possibly even a
four quark combination .
[3]
The existence of the particle has been confirmed by members of the
CMS collaboration at the
Large Hadron Collider on November 14, 2012
[4]
[5] and by the
DØ experiment at the
Tevatron on September 25, 2013.
[6]
[7] The
Belle experiment
[8] has searched for this particle but found no evidence for its existence.
The
LHCb experiment observes a peak at the same position in the J/ψϕ invariant mass, but it is best described as a Ds ± Ds ∗∓ cusp, and is much broader than the previous measurements of the Y(4140).
[9]
[10]
The
Particle Data Group has renamed Y(4140) to follow naming conventions to X(4140).
See also
References
^
"Oddball Particle Surprises Physicists at Fermilab" . redOrbit. 19 March 2009. Retrieved 2009-03-21 .
^
Handwerk, Brian (20 March 2009).
"Strange Particle Created; May Rewrite How Matter's Made" .
National Geographic News . Archived from
the original on March 22, 2009. Retrieved 2009-03-21 .
^
Minard, Anne (18 March 2009).
"New Particle Throws Monkeywrench in Particle Physics" .
Universe Today .
^ Riesselmann, Kurt (December 4, 2012).
"Experiment confirms existence of odd particle" . Phys.Org.
^ Hidalgo-Duque, C; Nieves, J; Pavón Valderrama, M (2012). "Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)". Nuclear Physics A . 914 : 482–487.
arXiv :
1211.7004 .
Bibcode :
2013NuPhA.914..482H .
doi :
10.1016/j.nuclphysa.2013.01.025 .
S2CID
53549773 .
^ Dorigo, Tommaso (September 26, 2013).
"DZERO Confirms The Y(4140) And Its Excitation"
^ D0 Collaboration; Abbott, B; Acharya, B. S; Adams, M; Adams, T; Agnew, J. P; Alexeev, G. D; Alkhazov, G; Alton, A; Askew, A; Atkins, S; Augsten, K; Avila, C; Badaud, F; Bagby, L; Baldin, B; Bandurin, D. V; Banerjee, S; Barberis, E; Baringer, P; Bartlett, J. F; Bassler, U; Bazterra, V; Bean, A; Begalli, M; Bellantoni, L; Beri, S. B; Bernardi, G; Bernhard, R; et al. (2014). "Search for the X(4140) state in B+ →J/ψφK+ decays with the D0 detector". Physical Review D . 89 (12004): 012004.
arXiv :
1309.6580 .
Bibcode :
2014PhRvD..89a2004A .
doi :
10.1103/PhysRevD.89.012004 .
S2CID
119226762 . {{
cite journal }}
: CS1 maint: numeric names: authors list (
link )
^ Shen, C. P.; et al. (2010). "Evidence for a New Resonance and Search for the Y (4140) in the γγ→ϕJ /ψ Process".
Physical Review Letters . 104 (11): 112004.
arXiv :
0912.2383 .
Bibcode :
2010PhRvL.104k2004S .
doi :
10.1103/PhysRevLett.104.112004 .
PMID
20366468 .
S2CID
31594166 .
^ LHCb collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves Jr, A. A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Andreassi, G; Andreotti, M; Andrews, J. E; Appleby, R. B; Aquines Gutierrez, O; Archilli, F; d'Argent, P; Arnau Romeu, J; Artamonov, A; Artuso, M; Aslanides, E; et al. (2017). "Observation of J/ψφ structures consistent with exotic states from amplitude analysis of B+ →J/ψφK+ decays". Physical Review Letters . 118 (2): 022003.
arXiv :
1606.07895 .
Bibcode :
2017PhRvL.118b2003A .
doi :
10.1103/PhysRevLett.118.022003 .
PMID
28128595 .
S2CID
206284149 .
^ LHBc collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves Jr, A. A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Andreassi, G; Andreotti, M; Andrews, J. E; Appleby, R. B; Aquines Gutierrez, O; Archilli, F; d'Argent, P; Arnau Romeu, J; Artamonov, A; Artuso, M; Aslanides, E; et al. (2017). "Amplitude analysis of B+ →J/ψφK+ decays". Physical Review D . 95 (12002): 012002.
arXiv :
1606.07898 .
Bibcode :
2017PhRvD..95a2002A .
doi :
10.1103/PhysRevD.95.012002 .
S2CID
73689011 .
External links
Further reading