First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>

Yang, S. B.; Tanida, K.; Kim, B. H.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Babu, V.; Badhrees, I.; Bakich, A. M.; Barberio, E.; Bhardwaj, V.; Bhuyan, B.; Biswal, Jyoti Prakash; Bonvicini, G.; Bożek, A.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, K.; Chobanova, V.; Choi, Y.; Cinabro, D.; Dalseno, J.; Danilov, M.; Dash, N.; Doležal, Z.; Drásal, Z.; Dutta, D.; Eidelman, S.; Farhat, H.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Gabyshev, N.; Garmash, A.; Gaur, V.; Gillard, R.; Goh, Y. M.; Goldenzweig, P.; Greenwald, D.; Grygier, J.; Haba, J.; Hamer, P.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hou, W.-S.; Iijima, T.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Jacobs, W. W.; Jaeglé, I.; Jeon, H. B.; Joo, K. K.; Julius, T.; Kang, K. H.; Kato, E.; Katrenko, P.; Kiesling, C.; Kim, D. Y.; Kim, H. J.; Kim, J. B.; Kim, K. T.; Kim, M. J.; Kim, S. H.; Kim, S. K.; Kim, Y. J.; Kinoshita, K.; Kobayashi, N.; Kodyš, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kuhr, T.; Kuzmin, A.; Kwon, Y.; Lange, J. S.; Lee, I. S.; Li, C. H.; Li, H.; Li, L.; Li, Y.; Gioi, L. Li; Libby, J.; Liventsev, D.; Lubej, M.; Masuda, M.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moll, A.; Moon, H. K.; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Nath, K. J.; Nayak, M.; Negishi, K.; Niiyama, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Okuno, S.; Olsen, S. L.; Pakhlova, G.; Pal, B.; Park, C. W.; Park, H.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Pulvermacher, C.; Rauch, J.; Ritter, M.; Rostomyan, A.; Ryu, S.; Sahoo, H.; Sakai, Y.; Sandilya, S.; Šantelj, L.; Sanuki, T.; Sato, Y.; Savinov, V.; Schlüter, T.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Seino, Y.; Senyo, K.; Seon, O.; Seong, I. S.; Sevior, M. E.; Shebalin, V.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Simon, F.; Sohn, Y. S.; Sokolov, A.; Stanič, S.; Starič, M.; Stypula, J.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Teramoto, Y.; Trabelsi, K.; Trusov, V.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Vanhoefer, P.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Vossen, A.; Wagner, M. N.; Wang, C. H.; Wang, M. Z.; Wang, P.; Wang, X. L.; Watanabe, Y.; Williams, K. M.; Won, E.; Yamaoka, J.; Yashchenko, S.; Ye, H.; Yelton, J.; Yuan, C. Z.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/physrevlett.117.011801

Cited by 37 publications

(28 citation statements)

References 26 publications

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“…1 only account for the reactions which produce the signal-narrow cusp structure in Λ + c → pK − π + . The three-body decays Λ + c → pK − π + are dominated by the resonant subchannels pK * 0 , ∆ ++ K − and Λ(1520)π + , and a smooth nonresonant background [61]. However, it can be seen that in Fig.…”

Section: Numerical Resultsmentioning

confidence: 91%

Visible narrow cusp structure in Λc+→pK−π+ enhanced by triangle singularity

Liu

Xie

et al. 2019

Phys. Rev. D

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A resonance-like structure as narrow as 10 MeV is observed in the K − p invariant mass distributions in Λ + c → pK − π + at Belle. Based on the large data sample of about 1.5 million events and the small bin width of just 1 MeV for the K − p invariant mass spectrum, the narrow peak is found precisely lying at the Λη threshold. While lacking evidence for a quark model state with such a narrow width at this mass region, we find that this narrow structure can be naturally identified as a threshold cusp but enhanced by the nearby triangle singularity via the Λ-a0(980) + or η-Σ(1660) + rescatterings.

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Section: Numerical Resultsmentioning

confidence: 91%

Visible narrow cusp structure in Λc+→pK−π+ enhanced by triangle singularity

Liu

Xie

et al. 2019

Phys. Rev. D

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“…Λ + c → pK − π + decay chain Λ + c → pK − π + is the main hadronic decay of the ground-state charmed baryon Λ + c [28]. The measurement of the decay is facilitated by the fact that all final-state particles are charged [32,33]. Each of the three subchannels has at least one clearly visible resonance in the Dalitz plot, Λ(1520) in the pK − channel, ∆(1232) ++ in pπ + , and K * (892) 0 in K − π + [33,34].…”

Section: Examplesmentioning

confidence: 99%

Dalitz-plot decomposition for three-body decays

et al. 2020

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We present a general formalism to write the decay amplitude for multibody reactions with explicit separation of the rotational degrees of freedom, which are well controlled by the spin of the decay particle, and dynamic functions on the subchannel invariant masses, which require modeling. Using the three-particle kinematics we demonstrate the proposed factorization, named the Dalitz-plot decomposition. The Wigner rotations, that are subtle factors needed by the isobar modeling in the helicity framework, are simplified with the proposed decomposition. Consequently, we are able to provide them in an explicit form suitable for the general case of arbitrary spins. The only unknown model-dependent factors are the isobar lineshapes that describe the subchannel dynamics. The advantages of the new decomposition are shown through three examples relevant for the recent discovery of the exotic charmonium candidate Zc(4430), the pentaquarks Pc, and the intriguing Λ + c → pK − π + decay. I. INTRODUCTIONPartial-wave decomposition of reaction amplitudes is widely used in the analysis of both fixed target (e.g. COM-PASS, VES, CLAS, GlueX), and collider (e.g. LHCb, BESIII, Belle, BaBar) experiments. It is the most powerful way to account for spin and parity, J P , of various contributions, thus required in quantum number determinations of newly observed resonances. It also provides for the most sensitive way of distinguishing exotic hadrons, including the XY Z states and pentaquark candidates in the heavy quarkonium sector, from usually large contributions by ordinary mesons and baryons. To establish the existence of a resonance in a given partial wave, it is desired to have a representation of the reaction amplitude consistent with the S-matrix principles of unitarity, analyticity and Lorentz invariance. This is nontrivial when dealing with particles with spin, which introduce kinematical singularities and (pseudo)threshold relations between partial waves. Amplitude analysis in the context of the S-matrix constraints has been extensively studied in the past using both covariant [1-3] and noncovariant methods [4][5][6][7]. When several particles with spin are involved, the noncovariant approach is more practical, because spin is universally accounted for through the simple Wigner D-functions. In this paper, we take a step to simplify amplitude construction and discuss a convenient framework which incorporates dynamic subchannel resonances for a multiparticle decay. We present a universal amplitude formula which describes the decay of an arbitrary spin state to three particles, each also with arbitrary spin. Specifically, we write the amplitudes in a factorized form to separate the dependence on the angles that characterize the orientation of the final-state particles (and thus the information about the polarization of the parent particle) from the Dalitz-plot variables that encode the information on the intermediate resonances in the multiparticle final state. We do not focus on details of the two-particle dynamics merely giving ...

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“…Charm physics plays an important role in studying the perturbative and non-perturbative QCD and searching for new physics with special structure in the up-type quark sector. Unlike the charmed meson decays with fruitful results during the past decades [1], the study of weak decays of charmed baryons has been made little progress both in theory and in experiment until a few years ago when some new measurements were performed by the Belle and BESIII experiments [2][3][4][5][6][7][8][9][10][11]. Charmed baryon physics is becoming intriguing with more data available and collected by Belle (II), BESIII and LHCb.…”

Section: Introductionmentioning

confidence: 99%

K0 S − K0 L asymmetries and CP violation in charmed baryon decays into neutral kaons

Wang¹,

Guo²,

Long³

et al. 2018

J. High Energ. Phys.

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We study the K 0 S −K 0 L asymmetries and CP violations in charm-baryon decays with neutral kaons in the final state. The K 0 S − K 0 L asymmetry can be used to search for two-body doubly Cabibbo-suppressed amplitudes of charm-baryon decays, with the one in Λ + c → pK 0 S,L as a promising observable. Besides, it is studied for a new CP -violation effect in these processes, induced by the interference between the Cabibbo-favored and doubly Cabibbo-suppressed amplitudes with the neutral kaon mixing. Once the new CP-violation effect is determined by experiments, the direct CP asymmetry in neutral kaon modes can then be extracted and used to search for new physics. The numerical results based on SU(3) symmetry will be tested by the experiments in the future.

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First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon:Λc+→pK+π−

Cited by 37 publications

References 26 publications

Visible narrow cusp structure in Λc+→pK−π+ enhanced by triangle singularity

Visible narrow cusp structure in Λc+→pK−π+ enhanced by triangle singularity

Dalitz-plot decomposition for three-body decays

K0 S − K0 L asymmetries and CP violation in charmed baryon decays into neutral kaons

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